| 1 | ; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
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| 2 | ;
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| 3 | ; This file is part of AiR-BOOT
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| 4 | ;
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| 5 | ; AiR-BOOT is free software: you can redistribute it and/or modify it under
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| 6 | ; the terms of the GNU General Public License as published by the Free
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| 7 | ; Software Foundation, either version 3 of the License, or (at your option)
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| 8 | ; any later version.
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| 9 | ;
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| 10 | ; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | ; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
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| 12 | ; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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| 13 | ; details.
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| 14 | ;
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| 15 | ; You should have received a copy of the GNU General Public License along with
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| 16 | ; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
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| 17 | ;
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| 18 | ;---------------------------------------------------------------------------
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| 19 | ; AiR-BOOT / DRIVE I/O
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| 20 | ;---------------------------------------------------------------------------
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| 21 |
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| 22 |
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| 23 |
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| 24 | IFDEF MODULE_NAMES
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| 25 | DB 'DRIVEIO',0
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| 26 | ENDIF
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| 27 |
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| 28 | ;
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| 29 | ; Check if INT13X extensions are supported.
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| 30 | ; AirBoot requires these extensions, and will halt if they are not available.
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| 31 | ; Modified: AX, BX, CX, DX, CF
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| 32 | DriveIO_CheckFor13extensions Proc Near
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| 33 | mov ah, 41h
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| 34 | mov bx, 55AAh
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| 35 | mov dl, [BIOS_BootDisk] ; We check using the boot-disk
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| 36 | int 13h
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| 37 |
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| 38 | IFDEF AUX_DEBUG
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| 39 | IF 0
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| 40 | DBG_TEXT_OUT_AUX 'DriveIO_CheckFor13extensions:'
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| 41 | PUSHRF
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| 42 | call DEBUG_DumpRegisters
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| 43 | ;~ call AuxIO_DumpParagraph
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| 44 | ;~ call AuxIO_TeletypeNL
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| 45 | mov si, offset [INT13X_DiskParams]
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| 46 | mov word ptr [si], 50h
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| 47 | mov ah, 48h
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| 48 | int 13h
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| 49 | call DEBUG_DumpRegisters
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| 50 | ;~ call AuxIO_DumpSector
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| 51 | POPRF
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| 52 | ENDIF
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| 53 | ENDIF
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| 54 |
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| 55 | jc PCCF13E_NotFound ; Error occured
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| 56 | cmp bx, 0AA55h
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| 57 | je PCCF13E_Found
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| 58 | PCCF13E_NotFound:
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| 59 | ret
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| 60 | PCCF13E_Found:
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| 61 | and cx, 1 ; Check 42h-44h,47h,48h supported
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| 62 | jz PCCF13E_NotFound ; Sig OK but no support, strange beast
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| 63 | mov byte ptr [CurIO_UseExtension], 1
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| 64 | ret
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| 65 | DriveIO_CheckFor13extensions EndP
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| 66 |
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| 67 |
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| 68 | ; Note: Some routines set DS/ES to CS or even address via CS, even if its not
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| 69 | ; needed. This was done for SECURITY. So DO NOT remove it.
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| 70 | ; Its there to make sure the correct data is loaded/written to/from
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| 71 | ; harddrive.
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| 72 | ;
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| 73 | ; IF YOU MODIFY ANYTHING IN HERE, YOU MAY EASILY BREAK YOUR HARDDRIVE!
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| 74 |
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| 75 | ; Will only load base-configuration, will NOT load IPT nor Hide-Config
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| 76 | ; Those are originally loaded on startup and will NOT get reloaded.
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| 77 | DriveIO_LoadConfiguration Proc Near Uses ax bx cx dx es
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| 78 |
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| 79 | IFDEF AUX_DEBUG
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| 80 | IF 0
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| 81 | DBG_TEXT_OUT_AUX 'DriveIO_LoadConfiguration:'
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| 82 | PUSHRF
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| 83 | ;~ call DEBUG_DumpRegisters
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| 84 | ;~ call AuxIO_DumpParagraph
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| 85 | ;~ call AuxIO_TeletypeNL
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| 86 | POPRF
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| 87 | ENDIF
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| 88 | ENDIF
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| 89 |
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| 90 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 91 | mov ax, cs
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| 92 | mov es, ax
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| 93 | mov bx, offset Configuration
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| 94 | xor dh, dh
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| 95 | mov dl, [BIOS_BootDisk] ; Disk we booted from
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| 96 | mov cx, 0037h ; Sector 55 (CHS)
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| 97 | mov ax, 0201h ; Function 02, read 1 sector...
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| 98 | int 13h
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| 99 | jnc DIOLC_NoError
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| 100 | call MBR_LoadError ; Will Abort BootUp
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| 101 |
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| 102 |
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| 103 | DIOLC_NoError:
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| 104 | ret
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| 105 | DriveIO_LoadConfiguration EndP
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| 106 |
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| 107 | DriveIO_SaveConfiguration Proc Near Uses ax bx cx dx ds es si
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| 108 |
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| 109 | IFDEF AUX_DEBUG
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| 110 | IF 0
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| 111 | DBG_TEXT_OUT_AUX 'DriveIO_SaveConfiguration:'
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| 112 | PUSHRF
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| 113 | ;~ call DEBUG_DumpRegisters
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| 114 | ;~ call AuxIO_DumpParagraph
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| 115 | ;~ call AuxIO_TeletypeNL
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| 116 | POPRF
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| 117 | ENDIF
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| 118 | ENDIF
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| 119 |
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| 120 | mov ax, cs
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| 121 | mov ds, ax
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| 122 | mov es, ax ; Safety first (CS==DS==ES)
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| 123 | ; --- Overwrite Floppy-Name with "FloppyDrive"
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| 124 | mov si, offset TXT_Floppy_Drive
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| 125 | mov di, offset PartitionTable
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| 126 | sub di, 30 ; Adjust to Floppy-Name
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| 127 | mov cx, 11
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| 128 | rep movsb
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| 129 | mov si, offset Configuration ; Calculate new checksum
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| 130 | xor bx, bx
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| 131 |
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| 132 | ; Changed from 5 to calculated value (not here, see compat. issue below)
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| 133 | ; Fixes issue: #2987 -- "air-boot doesn't remember drive letter"
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| 134 | ; Size of the ab-configuration in 512 byte sectors
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| 135 | ;mov cx, (MBR_BackUpMBR - Configuration) / 200h
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| 136 |
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| 137 | ; AB v1.07 stores a 5 sector configuration with a 5 sector checksum.
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| 138 | ; AB v1.0.8+ *should* stores a 7 sector configuration with a
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| 139 | ; 7 sector checksum.
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| 140 | ; Because 5 was hardcoded here, SET(A)BOOT v1.07 will see see an AB v1.0.8+
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| 141 | ; config as corrupted, while this is not the case.
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| 142 | ; So, for compatibility reasons, in v1.0.8+, the checksum stored is over
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| 143 | ; 5 sectors, to be compatible with v1.07.
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| 144 | ; This may change (be corrected) in future versions !
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| 145 | mov cx,5
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| 146 |
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| 147 | mov dx, [CFG_CheckConfig]
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| 148 | mov [CFG_CheckConfig], bx
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| 149 | DIOSC_Loop:
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| 150 | call MBR_GetCheckOfSector
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| 151 | loop DIOSC_Loop
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| 152 | mov [CFG_CheckConfig], bx
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| 153 | ; --------------------------------------------------------------------
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| 154 | ; ES == CS
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| 155 | mov bx, offset Configuration
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| 156 | xor dh, dh
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| 157 | mov dl, [BIOS_BootDisk] ; Disk we booted from
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| 158 | mov cx, 0037h ; Sector 55 (CHS)
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| 159 |
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| 160 | ; Changed from 5 to calculated value
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| 161 | ; Fixes issue: #2987 -- "air-boot doesn't remember drive letter"
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| 162 | ; Size of the ab-configuration in 512 byte sectors
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| 163 | mov al, (MBR_BackUpMBR - Configuration) / 200h
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| 164 | mov ah,03h
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| 165 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 166 | int 13h
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| 167 | jnc DIOSC_NoError
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| 168 | call MBR_SaveError ; Will Abort BootUp
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| 169 | DIOSC_NoError:
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| 170 | ret
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| 171 | DriveIO_SaveConfiguration EndP
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| 172 |
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| 173 | DriveIO_UpdateFloppyName Proc Near Uses bx cx dx ds si es di
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| 174 | mov ax, cs
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| 175 | mov ds, ax
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| 176 | mov es, ax
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| 177 |
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| 178 | mov ah, 00h ; Function 0 - Reset Drive
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| 179 | xor dl, dl
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| 180 | int 13h
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| 181 | xor dx, dx ; Cylinder=0, Head=0
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| 182 | mov cx, 1 ; Sector=1, Drive=0
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| 183 | mov bx, offset TmpSector ; ES:BX - TmpSector
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| 184 | mov ax, 0201h ; Function 2 - Load Sector
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| 185 | int 13h
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| 186 | jnc DIOUFN_AllFine
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| 187 |
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| 188 | ; --- Overwrite Floppy-Name with "No Disc"
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| 189 | mov si, offset TXT_Floppy_NoDisc
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| 190 | xor ax, ax
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| 191 | DIOUFN_WriteFloppyName:
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| 192 | mov di, offset PartitionTable
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| 193 | sub di, 30 ; Adjust to Floppy-Name
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| 194 | mov cl, 11
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| 195 | rep movsb
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| 196 | ret ; AX=-1 -> GotDisc, =0 -> NoDisc
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| 197 |
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| 198 | ; --- Floppy found and read, data in TempSector
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| 199 | DIOUFN_AllFine:
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| 200 | mov ax, -1
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| 201 | mov si, offset TXT_Floppy_NoName
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| 202 | cmp wptr es:[bx+54], 'AF'
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| 203 | jne DIOUFN_WriteFloppyName
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| 204 | cmp wptr es:[bx+56], '1T'
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| 205 | jne DIOUFN_WriteFloppyName
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| 206 | cmp bptr es:[bx+58], '2'
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| 207 | jne DIOUFN_WriteFloppyName
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| 208 | mov si, bx
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| 209 | add si, 43 ; FAT12 - Volume Label Location
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| 210 | jmp DIOUFN_WriteFloppyName
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| 211 | DriveIO_UpdateFloppyName EndP
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| 212 |
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| 213 | ; =============================================================================
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| 214 | ; HARDDRIVE / GENERAL ACCESS
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| 215 | ; =============================================================================
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| 216 | ; The following routines are used for harddisc/floppy access.
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| 217 | ; The access is done via INT 13h/CHS or INT 13h/LBA.
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| 218 | ; Access will be done prefered by INT 13h/CHS, because it's (I wonder!) much
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| 219 | ; faster, than the LBA-method. I don't know, why LBA is so slow. Perhaps BIOS.
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| 220 | ;
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| 221 | ; Internal access (to AiR-BOOT) is always done via INT 13h/CHS.
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| 222 |
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| 223 | DriveIO_GetHardDriveCount Proc Near Uses ds si
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| 224 | push ds
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| 225 | push si
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| 226 | push 0040h
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| 227 | pop ds
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| 228 | mov si, 0075h
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| 229 | mov dh, ds:[si] ; 40:75 -> POST: Total Harddiscs == DL
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| 230 | pop si
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| 231 | pop ds
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| 232 | mov [TotalHarddiscs], dh
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| 233 | ret
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| 234 | DriveIO_GetHardDriveCount EndP
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| 235 |
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| 236 |
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| 237 | ; Fills our LBA-Usage table. It holds the LBA-address, where BIOS/CHS access is
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| 238 | ; stopped and BIOS/LBA access is started.
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| 239 | ; This is calculated by Sector*Heads. Comparing will get done with Bit 25-10
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| 240 | ; on LBA sectors, so we actually divide sector number by 1024.
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| 241 | DriveIO_InitLBASwitchTable Proc Near Uses es di
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| 242 | mov di, offset LBASwitchTable
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| 243 | mov dh, [TotalHarddiscs]
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| 244 | mov dl, 80h ; First disk to process
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| 245 | DIOILUT_DriveLoop:
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| 246 | push dx
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| 247 | push di
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| 248 | mov ah, 08h
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| 249 | int 13h ; DISK - GET DRIVE PARAMETERS
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| 250 | mov ah, 0FBh ; Assume 255 heads/63 sectors, if error
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| 251 | jc DIOILUT_Error
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| 252 | and cl, 111111b ; Isolate lower 6 bits of CL -> sector count
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| 253 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 254 | ;movzx ax, cl
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| 255 | mov al,cl
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| 256 | mov ah,0
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| 257 |
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| 258 | mov bl, dh ; DH -> max head number
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| 259 | mul bl ; AX = Sectors*Heads
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| 260 | shl ah, 1
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| 261 | shl ah, 1 ; Shift 2 bits, so we are able to compare to
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| 262 | ; bit 16-23 of the LBA address
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| 263 | DIOILUT_Error:
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| 264 | pop di
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| 265 | pop dx
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| 266 | mov bptr ds:[di], ah ; Save that value
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| 267 | inc di ; Go to next BYTE
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| 268 | inc dl ; Next disk
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| 269 | dec dh ; Decrease disks to process
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| 270 | jnz DIOILUT_DriveLoop ; Next disk if DH != 0
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| 271 | ret
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| 272 | DriveIO_InitLBASwitchTable EndP
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| 273 |
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| 274 |
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| 275 |
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| 276 |
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| 277 | ;FIXME: Only LBA gets updated, need to update CHS too !!!!!!!
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| 278 |
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| 279 | ; Adjusts BX:AX / CX:DX to meet LVM sector location
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| 280 | ; BX:AX / CX:DX point to MBR or EBR !
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| 281 | ; Destroys SI
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| 282 | ; Rousseau: Enhanced to handle sector-numbers 127 and 255 besides 63 for LVM-info sectors.
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| 283 | ; Ugly, need to cleanup.
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| 284 | DriveIO_LVMAdjustToInfoSector Proc Near
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| 285 |
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| 286 | IFDEF AUX_DEBUG
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| 287 | IF 0
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| 288 | DBG_TEXT_OUT_AUX 'DriveIO_LVMAdjustToInfoSector:'
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| 289 | PUSHRF
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| 290 | call DEBUG_DumpRegisters
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| 291 | ;~ call AuxIO_DumpParagraph
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| 292 | ;~ call AuxIO_TeletypeNL
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| 293 | POPRF
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| 294 | ENDIF
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| 295 | ENDIF
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| 296 |
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| 297 | push cx ; Save Cyl/Sec part
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| 298 | xor ch,ch ; Clear low Cyl part
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| 299 | and cl,63 ; Clear high Cyl part
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| 300 | push bx ; We need BX...
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| 301 | push dx ; and DX temoraily
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| 302 | mov bx,offset [TrueSecs] ; Offset of sector table
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| 303 | xor dh,dh ; Clear DH because we use DL as index
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| 304 | and dl,01111111b ; Remove high bit of BIOS disk-nr
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| 305 | shl dx,2 ; Index to DWORD table
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| 306 | add bx,dx ; Point to TrueSecs for this disk
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| 307 | mov si,[bx] ; Get SPT for this disk
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| 308 | pop dx ; Restore DX...
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| 309 | pop bx ; and BX
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| 310 | ;~ sub si,cx ; Adjust offset !! INCORRECT FOR LBA (TP CX != 0 !!)
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| 311 | dec si
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| 312 | pop cx ; Restore Cyl/Sec part
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| 313 | add ax,si ; Add offset to low part...
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| 314 | adc bx,0 ; and high part of LBA address
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| 315 | or cl,63 ; Adjust CHS part !FIX ME for > 63! !! FIX HUGE DRIVE !!
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| 316 |
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| 317 | IFDEF AUX_DEBUG
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| 318 | IF 0
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| 319 | DBG_TEXT_OUT_AUX 'adjusted'
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| 320 | PUSHRF
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| 321 | call DEBUG_DumpRegisters
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| 322 | ;~ call AuxIO_DumpParagraph
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| 323 | ;~ call AuxIO_TeletypeNL
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| 324 | POPRF
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| 325 | ENDIF
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| 326 | ENDIF
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| 327 |
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| 328 | ret
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| 329 |
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| 330 | DriveIO_LVMAdjustToInfoSector EndP
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| 331 |
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| 332 |
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| 333 |
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| 334 |
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| 335 |
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| 336 |
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| 337 | ; #########################################################################
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| 338 | ; Routine: Loads partition to ExecBase and checks for validity
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| 339 | ; #########################################################################
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| 340 | ; Calling : bx:ax - Absolute sector
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| 341 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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| 342 | ; Returns : Carry Set if invalid partition encountered
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| 343 | ; Preserve: all registers
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| 344 | ; #########################################################################
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| 345 | DriveIO_LoadPartition Proc Near Uses si
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| 346 |
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| 347 | IFDEF AUX_DEBUG
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| 348 | IF 0
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| 349 | DBG_TEXT_OUT_AUX 'DriveIO_LoadPartition:'
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| 350 | PUSHRF
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| 351 | call DEBUG_DumpRegisters
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| 352 | ;~ call AuxIO_DumpParagraph
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| 353 | ;~ call AuxIO_TeletypeNL
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| 354 | POPRF
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| 355 | ENDIF
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| 356 | ENDIF
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| 357 |
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| 358 | mov wptr cs:[CurPartition_Location+0], ax
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| 359 | mov wptr cs:[CurPartition_Location+2], bx
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| 360 | mov wptr cs:[CurPartition_Location+4], dx
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| 361 | mov wptr cs:[CurPartition_Location+6], cx ; Saves the location
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| 362 | mov si, offset PartitionSector ; DS:SI - ExecBase
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| 363 |
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| 364 |
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| 365 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 366 | call DriveIO_LoadSector
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| 367 |
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| 368 | clc
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| 369 | cmp wptr [si+LocBR_Magic], 0AA55h
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| 370 | je DIOLP_Success
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| 371 | ; We check, if we are scanning partitions. In that case, if CHS is not 0/0/1
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| 372 | ; we will display a "bad partition table" message and halt the system.
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| 373 | cmp cx, 0001h
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| 374 | jne DIOLP_Failed
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| 375 | or dh, dh
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| 376 | jnz DIOLP_Failed
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| 377 | stc ; Set carry, so no partition table
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| 378 | DIOLP_Success:
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| 379 |
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| 380 |
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| 381 |
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| 382 | ret
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| 383 | DIOLP_Failed:
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| 384 | jmp DriveIO_GotLoadError
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| 385 | DriveIO_LoadPartition EndP
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| 386 |
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| 387 | ; #########################################################################
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| 388 | ; Routine: Writes a partition from ExecBase to its original sector
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| 389 | ; #########################################################################
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| 390 | ; Calling : none
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| 391 | ; Returns : none
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| 392 | ; Preserve: all registers
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| 393 | ; #########################################################################
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| 394 | DriveIO_SavePartition Proc Near Uses ax bx cx dx si
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| 395 |
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| 396 | IFDEF AUX_DEBUG
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| 397 | IF 0
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| 398 | DBG_TEXT_OUT_AUX 'DriveIO_SavePartition:'
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| 399 | PUSHRF
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| 400 | ;~ call DEBUG_DumpRegisters
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| 401 | ;~ call AuxIO_DumpParagraph
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| 402 | ;~ call AuxIO_TeletypeNL
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| 403 | POPRF
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| 404 | ENDIF
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| 405 | ENDIF
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| 406 |
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| 407 | mov ax, wptr cs:[CurPartition_Location+0]
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| 408 | mov bx, wptr cs:[CurPartition_Location+2]
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| 409 | mov dx, wptr cs:[CurPartition_Location+4]
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| 410 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets prev. saved location
|
|---|
| 411 | mov si, offset PartitionSector ; DS:SI - ExecBase
|
|---|
| 412 | cmp wptr [si+LocBR_Magic], 0AA55h ; Checks for signature, if not found
|
|---|
| 413 | jne DIOSP_SevereError ; we assume a really bad error
|
|---|
| 414 | call DriveIO_SaveSector
|
|---|
| 415 | DIOSP_SevereError:
|
|---|
| 416 | ret
|
|---|
| 417 | DriveIO_SavePartition EndP
|
|---|
| 418 |
|
|---|
| 419 | ; Keeps DS:SI for caller
|
|---|
| 420 | DriveIO_LoadTmpSector Proc Near
|
|---|
| 421 | mov si, offset TmpSector
|
|---|
| 422 | call DriveIO_LoadSector
|
|---|
| 423 | ret
|
|---|
| 424 | DriveIO_LoadTmpSector EndP
|
|---|
| 425 |
|
|---|
| 426 | ; Keeps DS:SI for caller
|
|---|
| 427 | DriveIO_SaveTmpSector Proc Near
|
|---|
| 428 | mov si, offset TmpSector
|
|---|
| 429 | call DriveIO_SaveSector
|
|---|
| 430 | ret
|
|---|
| 431 | DriveIO_SaveTmpSector EndP
|
|---|
| 432 |
|
|---|
| 433 |
|
|---|
| 434 |
|
|---|
| 435 | ; Keeps DS:SI for caller, sets carry if valid LVM sector encountered
|
|---|
| 436 | DriveIO_LoadLVMSector Proc Near Uses ax bx cx dx
|
|---|
| 437 |
|
|---|
| 438 | IFDEF AUX_DEBUG
|
|---|
| 439 | IF 0
|
|---|
| 440 | DBG_TEXT_OUT_AUX 'DriveIO_LoadLVMSector:'
|
|---|
| 441 | PUSHRF
|
|---|
| 442 | call DEBUG_DumpRegisters
|
|---|
| 443 | call AuxIO_DumpSector
|
|---|
| 444 | ;~ call AuxIO_DumpParagraph
|
|---|
| 445 | ;~ call AuxIO_TeletypeNL
|
|---|
| 446 | POPRF
|
|---|
| 447 | ENDIF
|
|---|
| 448 | ENDIF
|
|---|
| 449 |
|
|---|
| 450 | test byte ptr [CFG_IgnoreLVM], 1 ; We are supposed to ignore LVM, so
|
|---|
| 451 | jnz DIOLLVMS_NoLVMSector ; don't load but declare as bad!
|
|---|
| 452 | mov ax, wptr cs:[CurPartition_Location+0]
|
|---|
| 453 | mov bx, wptr cs:[CurPartition_Location+2]
|
|---|
| 454 | mov dx, wptr cs:[CurPartition_Location+4]
|
|---|
| 455 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets cur. partition location
|
|---|
| 456 |
|
|---|
| 457 | call DriveIO_LVMAdjustToInfoSector
|
|---|
| 458 |
|
|---|
| 459 | mov si, offset [LVMSector]
|
|---|
| 460 | call DriveIO_LoadSector
|
|---|
| 461 |
|
|---|
| 462 | IFDEF AUX_DEBUG
|
|---|
| 463 | IF 0
|
|---|
| 464 | DBG_TEXT_OUT_AUX 'lvm record ex'
|
|---|
| 465 | PUSHRF
|
|---|
| 466 | ;~ call AuxIO_TeletypeHexWord
|
|---|
| 467 | ;~ call AuxIO_TeletypeNL
|
|---|
| 468 | call DEBUG_DumpRegisters
|
|---|
| 469 | ;~ call AuxIO_DumpSector
|
|---|
| 470 | mov cx, 7
|
|---|
| 471 | @@:
|
|---|
| 472 | call AuxIO_DumpParagraph
|
|---|
| 473 | call AuxIO_TeletypeNL
|
|---|
| 474 | add si, 16
|
|---|
| 475 | loop @B
|
|---|
| 476 | POPRF
|
|---|
| 477 | ENDIF
|
|---|
| 478 | ENDIF
|
|---|
| 479 |
|
|---|
| 480 |
|
|---|
| 481 | call LVM_CheckSectorSignature
|
|---|
| 482 | jnc DIOLLVMS_NoLVMSector
|
|---|
| 483 | call LVM_CheckSectorCRC
|
|---|
| 484 | jnc DIOLLVMS_NoLVMSector
|
|---|
| 485 | ret
|
|---|
| 486 |
|
|---|
| 487 | ; This here is called, if an invalid (or no) LVM information sector is found
|
|---|
| 488 | ; It will truncate the first byte of the sector, so all other routines
|
|---|
| 489 | ; will notice it easily by just comparing the first byte.
|
|---|
| 490 | DIOLLVMS_NoLVMSector:
|
|---|
| 491 | mov bptr [si+LocLVM_SignatureStart], 0
|
|---|
| 492 | ret
|
|---|
| 493 | DriveIO_LoadLVMSector EndP
|
|---|
| 494 |
|
|---|
| 495 |
|
|---|
| 496 |
|
|---|
| 497 | ; Keeps DS:SI for caller, saves at anytime w/o checks (!)
|
|---|
| 498 | DriveIO_SaveLVMSector Proc Near Uses ax bx cx dx
|
|---|
| 499 |
|
|---|
| 500 | IFDEF AUX_DEBUG
|
|---|
| 501 | IF 0
|
|---|
| 502 | DBG_TEXT_OUT_AUX 'DriveIO_SaveLVMSector:'
|
|---|
| 503 | PUSHRF
|
|---|
| 504 | ;~ call DEBUG_DumpRegisters
|
|---|
| 505 | ;~ call AuxIO_DumpParagraph
|
|---|
| 506 | ;~ call AuxIO_TeletypeNL
|
|---|
| 507 | POPRF
|
|---|
| 508 | ENDIF
|
|---|
| 509 | ENDIF
|
|---|
| 510 |
|
|---|
| 511 | test byte ptr [CFG_IgnoreLVM], 1 ; We are supposed to ignore LVM, so
|
|---|
| 512 | jnz DIOSLVMS_SevereError ; don't save at anytime (security!)
|
|---|
| 513 | mov ax, wptr cs:[CurPartition_Location+0]
|
|---|
| 514 | mov bx, wptr cs:[CurPartition_Location+2]
|
|---|
| 515 | mov dx, wptr cs:[CurPartition_Location+4]
|
|---|
| 516 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets cur. partition location
|
|---|
| 517 | call LVM_CheckSectorSignature
|
|---|
| 518 | jnc DIOSLVMS_SevereError ; LVM Signature must be there
|
|---|
| 519 |
|
|---|
| 520 | IFDEF AUX_DEBUG
|
|---|
| 521 | IF 0
|
|---|
| 522 | pushf
|
|---|
| 523 | pusha
|
|---|
| 524 | ;~ dioatlvm db 'DriveIO_LVMAdjustToInfoSector',10,0
|
|---|
| 525 | ;~ pushf
|
|---|
| 526 | ;~ pusha
|
|---|
| 527 | ;~ mov si,offset dioatlvm
|
|---|
| 528 | ;~ call AuxIO_Print
|
|---|
| 529 | ;~ popa
|
|---|
| 530 | ;~ popf
|
|---|
| 531 | call DEBUG_DumpRegisters
|
|---|
| 532 | call DEBUG_DumpCHS
|
|---|
| 533 | popa
|
|---|
| 534 | popf
|
|---|
| 535 | ENDIF
|
|---|
| 536 | ENDIF
|
|---|
| 537 |
|
|---|
| 538 | call DriveIO_LVMAdjustToInfoSector
|
|---|
| 539 |
|
|---|
| 540 | IFDEF AUX_DEBUG
|
|---|
| 541 | IF 0
|
|---|
| 542 | pushf
|
|---|
| 543 | pusha
|
|---|
| 544 | call DEBUG_DumpRegisters
|
|---|
| 545 | call DEBUG_DumpCHS
|
|---|
| 546 | popa
|
|---|
| 547 | popf
|
|---|
| 548 | ENDIF
|
|---|
| 549 | ENDIF
|
|---|
| 550 |
|
|---|
| 551 | mov si, offset LVMSector
|
|---|
| 552 | call DriveIO_SaveSector
|
|---|
| 553 | DIOSLVMS_SevereError:
|
|---|
| 554 | ret
|
|---|
| 555 | DriveIO_SaveLVMSector EndP
|
|---|
| 556 |
|
|---|
| 557 |
|
|---|
| 558 |
|
|---|
| 559 | ; Special error message instead of "LOAD ERROR" during partition scanning,
|
|---|
| 560 | ; so users will notice that something is bad with their partition table(s)
|
|---|
| 561 | DriveIO_GotLoadError Proc Near
|
|---|
| 562 | test byte ptr cs:[CurIO_Scanning], 1 ; Must be CS:, cause DS!=CS maybe here
|
|---|
| 563 | jnz InScanMode
|
|---|
| 564 | jmp MBR_LoadError
|
|---|
| 565 | InScanMode:
|
|---|
| 566 | mov si, offset TXT_BrokenPartitionTable
|
|---|
| 567 | push cs
|
|---|
| 568 | pop ds
|
|---|
| 569 | call MBR_Teletype
|
|---|
| 570 | mov si, offset BrokenHDD
|
|---|
| 571 | sub dl, 50h ; 80h -> '0'
|
|---|
| 572 | cmp dl, 39h
|
|---|
| 573 | jbe DIOGLE_BelowA
|
|---|
| 574 | add dl, 7 ; 3Ah -> 'A'
|
|---|
| 575 | DIOGLE_BelowA:
|
|---|
| 576 | mov bptr [si+5], dl
|
|---|
| 577 | call MBR_Teletype
|
|---|
| 578 |
|
|---|
| 579 | ; JWasm: cannot jump to local label in other procedure.
|
|---|
| 580 | ; Changed to halt here.
|
|---|
| 581 | ;jmp MBRLE_Halt
|
|---|
| 582 | DriveIO_GotLoadError_halt:
|
|---|
| 583 | jmp DriveIO_GotLoadError_halt
|
|---|
| 584 | DriveIO_GotLoadError EndP
|
|---|
| 585 |
|
|---|
| 586 | ; #########################################################################
|
|---|
| 587 | ; Routine: Loads a specified sector to DS:DI
|
|---|
| 588 | ; #########################################################################
|
|---|
| 589 | ; Calling : bx:ax - Absolute sector
|
|---|
| 590 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 591 | ; ds:si - Destination-Adress
|
|---|
| 592 | ; Returns : none
|
|---|
| 593 | ; Preserve: all registers
|
|---|
| 594 | ; #########################################################################
|
|---|
| 595 | DriveIO_LoadSector Proc Near Uses ax bx cx dx ds si es di
|
|---|
| 596 |
|
|---|
| 597 | IFDEF AUX_DEBUG
|
|---|
| 598 | IF 0
|
|---|
| 599 | DBG_TEXT_OUT_AUX 'DriveIO_LoadSector:'
|
|---|
| 600 | PUSHRF
|
|---|
| 601 | call DEBUG_DumpRegisters
|
|---|
| 602 | ;~ call AuxIO_DumpParagraph
|
|---|
| 603 | ;~ call AuxIO_TeletypeNL
|
|---|
| 604 | POPRF
|
|---|
| 605 | ENDIF
|
|---|
| 606 | ENDIF
|
|---|
| 607 |
|
|---|
| 608 | ; Is the drive not a harddrive?
|
|---|
| 609 | cmp dl, 80h
|
|---|
| 610 | jb DIOLS_UseNormal
|
|---|
| 611 |
|
|---|
| 612 | test byte ptr cs:[CurIO_UseExtension], 1
|
|---|
| 613 | jz DIOLS_UseNormal
|
|---|
| 614 | ; Are we forced do use LBA via Setting?
|
|---|
| 615 | jnz DIOLS_UseExtension
|
|---|
| 616 |
|
|---|
| 617 | ; Upper 8 bits of LBA-address set?
|
|---|
| 618 | ; Then use LBA (maximum boundary is 16320x16x63 = FB0400h)
|
|---|
| 619 | or bh, bh
|
|---|
| 620 | jnz DIOLS_UseExtension
|
|---|
| 621 | ; Compare Switch-Table value to bit 16-23 of LBA-address
|
|---|
| 622 | mov di, dx
|
|---|
| 623 | and di, 007Fh
|
|---|
| 624 | cmp bptr cs:[LBASwitchTable+di], bl
|
|---|
| 625 | jbe DIOLS_UseExtension
|
|---|
| 626 |
|
|---|
| 627 | DIOLS_UseNormal:
|
|---|
| 628 |
|
|---|
| 629 | IFDEF AUX_DEBUG
|
|---|
| 630 | IF 0
|
|---|
| 631 | DBG_TEXT_OUT_AUX 'DriveIO_ReadSectorCHS:'
|
|---|
| 632 | PUSHRF
|
|---|
| 633 | call DEBUG_DumpRegisters
|
|---|
| 634 | call AuxIO_DumpParagraph
|
|---|
| 635 | call AuxIO_TeletypeNL
|
|---|
| 636 | POPRF
|
|---|
| 637 | ENDIF
|
|---|
| 638 | ENDIF
|
|---|
| 639 |
|
|---|
| 640 | mov di, 3 ; retry count
|
|---|
| 641 | DIOLS_ErrorLoop:
|
|---|
| 642 | push ds
|
|---|
| 643 | pop es
|
|---|
| 644 | mov bx, si ; ES:BX - Destination
|
|---|
| 645 | mov ax, 0201h ; Function 2 - Load Sector
|
|---|
| 646 | int 13h
|
|---|
| 647 | jnc DIOLS_Success
|
|---|
| 648 | dec di ; decrement retry count
|
|---|
| 649 | jnz DIOLS_ErrorLoop
|
|---|
| 650 |
|
|---|
| 651 | ; Sector load failed...
|
|---|
| 652 | jmp DriveIO_GotLoadError
|
|---|
| 653 |
|
|---|
| 654 | DIOLS_UseExtension:
|
|---|
| 655 |
|
|---|
| 656 | mov di, ds ; segment for transfer address
|
|---|
| 657 | call DriveIO_ReadSectorLBA ; extended read
|
|---|
| 658 | jc DriveIO_GotLoadError ; halt on error
|
|---|
| 659 |
|
|---|
| 660 | ;~ push cx
|
|---|
| 661 | ;~ mov cs:[INT13X_DAP_NumBlocks], 1 ; Copy ONE sector
|
|---|
| 662 | ;~ mov wptr cs:[INT13X_DAP_Transfer+0], si
|
|---|
| 663 | ;~ mov cx, ds
|
|---|
| 664 | ;~ mov wptr cs:[INT13X_DAP_Transfer+2], cx ; Fill out Transfer Adress
|
|---|
| 665 | ;~ mov wptr cs:[INT13X_DAP_Absolute+0], ax
|
|---|
| 666 | ;~ mov wptr cs:[INT13X_DAP_Absolute+2], bx ; Fill out Absolute Sector
|
|---|
| 667 | ;~ push cs
|
|---|
| 668 | ;~ pop ds
|
|---|
| 669 | ;~ mov si, offset [INT13X_DAP]
|
|---|
| 670 | ;~ mov ah, 42h ; Extended Read
|
|---|
| 671 | ;~ int 13h
|
|---|
| 672 | ;~ pop cx
|
|---|
| 673 | ;~ jnc DIOLS_Success
|
|---|
| 674 |
|
|---|
| 675 | ; Sector load failed...
|
|---|
| 676 | ;~ jmp DriveIO_GotLoadError
|
|---|
| 677 |
|
|---|
| 678 | DIOLS_Success:
|
|---|
| 679 |
|
|---|
| 680 | IFDEF AUX_DEBUG
|
|---|
| 681 | IF 0
|
|---|
| 682 | DBG_TEXT_OUT_AUX 'sector loaded'
|
|---|
| 683 | PUSHRF
|
|---|
| 684 | ;~ call DEBUG_DumpRegisters
|
|---|
| 685 | ;~ call AuxIO_DumpSector
|
|---|
| 686 | mov cx, 32
|
|---|
| 687 | @@:
|
|---|
| 688 | call AuxIO_DumpParagraph
|
|---|
| 689 | call AuxIO_TeletypeNL
|
|---|
| 690 | add si, 16
|
|---|
| 691 | loop @B
|
|---|
| 692 | POPRF
|
|---|
| 693 | ENDIF
|
|---|
| 694 | ENDIF
|
|---|
| 695 | ret
|
|---|
| 696 | DriveIO_LoadSector EndP
|
|---|
| 697 |
|
|---|
| 698 |
|
|---|
| 699 |
|
|---|
| 700 | ;##############################################################################
|
|---|
| 701 | ;# ACTION : Reads a sector from disk using INT13 extensions
|
|---|
| 702 | ;# ----------------------------------------------------------------------------
|
|---|
| 703 | ;# EFFECTS : Modifies DAP structure and fills transfer buffer
|
|---|
| 704 | ;# ----------------------------------------------------------------------------
|
|---|
| 705 | ;# IN : BX:AX - LBA address of sector
|
|---|
| 706 | ;# : DI:SI - SEG:OFF of transfer buffer
|
|---|
| 707 | ;# ----------------------------------------------------------------------------
|
|---|
| 708 | ;# OUT : CF=1 - failure
|
|---|
| 709 | ;##############################################################################
|
|---|
| 710 | DriveIO_ReadSectorLBA Proc Near
|
|---|
| 711 |
|
|---|
| 712 | IFDEF AUX_DEBUG
|
|---|
| 713 | IF 0
|
|---|
| 714 | DBG_TEXT_OUT_AUX 'DriveIO_ReadSectorLBA:'
|
|---|
| 715 | PUSHRF
|
|---|
| 716 | call DEBUG_DumpRegisters
|
|---|
| 717 | call AuxIO_DumpParagraph
|
|---|
| 718 | call AuxIO_TeletypeNL
|
|---|
| 719 | POPRF
|
|---|
| 720 | ENDIF
|
|---|
| 721 | ENDIF
|
|---|
| 722 |
|
|---|
| 723 | ; Push all registers
|
|---|
| 724 | pusha
|
|---|
| 725 | push ds
|
|---|
| 726 | push es
|
|---|
| 727 |
|
|---|
| 728 | ; One sector to read
|
|---|
| 729 | mov cs:[INT13X_DAP_NumBlocks], 1
|
|---|
| 730 |
|
|---|
| 731 | ; Setup transfer address
|
|---|
| 732 | mov wptr cs:[INT13X_DAP_Transfer+0], si ; offset
|
|---|
| 733 | mov wptr cs:[INT13X_DAP_Transfer+2], di ; segment
|
|---|
| 734 |
|
|---|
| 735 | ; Setup LBA64 address of requested sector
|
|---|
| 736 | mov wptr cs:[INT13X_DAP_Absolute+0], ax ; low word lower part
|
|---|
| 737 | mov wptr cs:[INT13X_DAP_Absolute+2], bx ; high word lower part
|
|---|
| 738 | mov wptr cs:[INT13X_DAP_Absolute+4], 0 ; low word upper part
|
|---|
| 739 | mov wptr cs:[INT13X_DAP_Absolute+6], 0 ; high word upper part
|
|---|
| 740 |
|
|---|
| 741 | ; Address of packet
|
|---|
| 742 | mov si, offset [INT13X_DAP] ; disk address packet
|
|---|
| 743 |
|
|---|
| 744 | ; Do the extended read
|
|---|
| 745 | mov ah, 42h ; read function
|
|---|
| 746 | int 13h ; transfer to bios
|
|---|
| 747 |
|
|---|
| 748 | ; Error occured
|
|---|
| 749 | jc DriveIO_ReadSectorLBA_exit
|
|---|
| 750 |
|
|---|
| 751 | ; AH should also be zero
|
|---|
| 752 | test ah, ah
|
|---|
| 753 | stc
|
|---|
| 754 | jnz DriveIO_ReadSectorLBA_exit
|
|---|
| 755 |
|
|---|
| 756 | ; Disk read succeeded, clear CF
|
|---|
| 757 | clc
|
|---|
| 758 |
|
|---|
| 759 | DriveIO_ReadSectorLBA_exit:
|
|---|
| 760 |
|
|---|
| 761 | ; Pop all registers
|
|---|
| 762 | pop es
|
|---|
| 763 | pop ds
|
|---|
| 764 | popa
|
|---|
| 765 |
|
|---|
| 766 | ret
|
|---|
| 767 | DriveIO_ReadSectorLBA EndP
|
|---|
| 768 |
|
|---|
| 769 |
|
|---|
| 770 |
|
|---|
| 771 | ;##############################################################################
|
|---|
| 772 | ;# ACTION : Writes a sector to disk using INT13 extensions
|
|---|
| 773 | ;# ----------------------------------------------------------------------------
|
|---|
| 774 | ;# EFFECTS : Modifies DAP structure and mofifies the disk
|
|---|
| 775 | ;# ----------------------------------------------------------------------------
|
|---|
| 776 | ;# IN : BX:AX - LBA address of sector
|
|---|
| 777 | ;# : DI:SI - SEG:OFF of transfer buffer
|
|---|
| 778 | ;# ----------------------------------------------------------------------------
|
|---|
| 779 | ;# OUT : CF=1 - failure
|
|---|
| 780 | ;##############################################################################
|
|---|
| 781 | DriveIO_WriteSectorLBA Proc Near
|
|---|
| 782 |
|
|---|
| 783 | IFDEF AUX_DEBUG
|
|---|
| 784 | IF 0
|
|---|
| 785 | DBG_TEXT_OUT_AUX 'DriveIO_WriteSectorLBA:'
|
|---|
| 786 | PUSHRF
|
|---|
| 787 | call DEBUG_DumpRegisters
|
|---|
| 788 | call AuxIO_DumpParagraph
|
|---|
| 789 | call AuxIO_TeletypeNL
|
|---|
| 790 | POPRF
|
|---|
| 791 | ENDIF
|
|---|
| 792 | ENDIF
|
|---|
| 793 |
|
|---|
| 794 | ; Push all registers
|
|---|
| 795 | pusha
|
|---|
| 796 | push ds
|
|---|
| 797 | push es
|
|---|
| 798 |
|
|---|
| 799 | ; One sector to read
|
|---|
| 800 | mov cs:[INT13X_DAP_NumBlocks], 1
|
|---|
| 801 |
|
|---|
| 802 | ; Setup transfer address
|
|---|
| 803 | mov wptr cs:[INT13X_DAP_Transfer+0], si ; offset
|
|---|
| 804 | mov wptr cs:[INT13X_DAP_Transfer+2], di ; segment
|
|---|
| 805 |
|
|---|
| 806 | ; Setup LBA64 address of requested sector
|
|---|
| 807 | mov wptr cs:[INT13X_DAP_Absolute+0], ax ; low word lower part
|
|---|
| 808 | mov wptr cs:[INT13X_DAP_Absolute+2], bx ; high word lower part
|
|---|
| 809 | mov wptr cs:[INT13X_DAP_Absolute+4], 0 ; low word upper part
|
|---|
| 810 | mov wptr cs:[INT13X_DAP_Absolute+6], 0 ; high word upper part
|
|---|
| 811 |
|
|---|
| 812 | ; Address of packet
|
|---|
| 813 | mov si, offset [INT13X_DAP] ; disk address packet
|
|---|
| 814 |
|
|---|
| 815 | ; Do the extended write
|
|---|
| 816 | xor al, al ; no write verify
|
|---|
| 817 | mov ah, 43h ; write function
|
|---|
| 818 | int 13h ; transfer to bios
|
|---|
| 819 |
|
|---|
| 820 | ; Error occured
|
|---|
| 821 | jc DriveIO_WriteSectorLBA_exit
|
|---|
| 822 |
|
|---|
| 823 | ; AH should also be zero
|
|---|
| 824 | test ah, ah
|
|---|
| 825 | stc
|
|---|
| 826 | jnz DriveIO_WriteSectorLBA_exit
|
|---|
| 827 |
|
|---|
| 828 | ; Disk write succeeded, clear CF
|
|---|
| 829 | clc
|
|---|
| 830 |
|
|---|
| 831 | DriveIO_WriteSectorLBA_exit:
|
|---|
| 832 |
|
|---|
| 833 | ; Pop all registers
|
|---|
| 834 | pop es
|
|---|
| 835 | pop ds
|
|---|
| 836 | popa
|
|---|
| 837 |
|
|---|
| 838 | ret
|
|---|
| 839 | DriveIO_WriteSectorLBA EndP
|
|---|
| 840 |
|
|---|
| 841 |
|
|---|
| 842 |
|
|---|
| 843 |
|
|---|
| 844 | ;##############################################################################
|
|---|
| 845 | ;# The Master LVM sector is *not* necessarily located at the end of the BIOS
|
|---|
| 846 | ;# view of TRACK0. Its location depends on the *OS/2 geometry* active when the
|
|---|
| 847 | ;# disk was partitioned. For disks < 502MiB this will most likely be LBA sector
|
|---|
| 848 | ;# 62, but for disks >502MiB, *extended* OS/2 geometry was used and DANIS506
|
|---|
| 849 | ;# uses SPT=127 for disks < 1TiB while IBMS506 uses SPT=255.
|
|---|
| 850 | ;# When a huge disk < 1TiB was partitioned with IBMS506, thus using SPT=255,
|
|---|
| 851 | ;# and the driver was later changed to DANIS506, DANI uses SPT=255, eventhough
|
|---|
| 852 | ;# the disk < 1TiB. Whether it is DANI that is LVM aware or something else
|
|---|
| 853 | ;# (maybe LVM itself) that makes DANI use the correct geometry has yet to be
|
|---|
| 854 | ;# investigated.
|
|---|
| 855 | ;#
|
|---|
| 856 | ;# Related geometry issues are also present with USB sticks, which can get
|
|---|
| 857 | ;# assigned a geometry by OS/2, which can depend if the stick was partitioned
|
|---|
| 858 | ;# on foreign systems or not, or even OS/2 manufacturing a geometry that is not
|
|---|
| 859 | ;# the same as the BIOS reports to us here. In both cases, fixed disks and
|
|---|
| 860 | ;# removable disks, the geometry recorded in the BPB of a partition can also
|
|---|
| 861 | ;# influence the geometry that OS/2 assigns. This is the case when 'preparing'
|
|---|
| 862 | ;# disks for LVM use, in which case BPB values could be incorporated.
|
|---|
| 863 | ;#
|
|---|
| 864 | ;# What this all boils down to, is that the geometry reported by the BIOS is
|
|---|
| 865 | ;# of no practical use, especially not when taking BIOS USB MSD emulation into
|
|---|
| 866 | ;# account. These are among the reasons why AirBoot needs to use LBA addressing
|
|---|
| 867 | ;# when handling LVM stuff and why LBA use cannot be disabled in the SETUP
|
|---|
| 868 | ;# anymore.
|
|---|
| 869 | ;#
|
|---|
| 870 | ;# So, a Master LVM sector can be present on any sector from LBA 254 downwards
|
|---|
| 871 | ;# and the only way to locate the correct one is to scan all the way down and,
|
|---|
| 872 | ;# if one is found, do proper validation on its values, because it may also be
|
|---|
| 873 | ;# a 'phantom' LVM sector left over from previous partition layouts.
|
|---|
| 874 | ;# Most of such 'phantoms' can be filtered out by verifying the location of
|
|---|
| 875 | ;# the found sector against the OS/2 geometry it specifies itself, which means
|
|---|
| 876 | ;# it must be located at the LBA of the SPT-1 it specifies.
|
|---|
| 877 | ;##############################################################################
|
|---|
| 878 | ;# ACTION : Locates the Master LVM sector on the specified disk
|
|---|
| 879 | ;# ----------------------------------------------------------------------------
|
|---|
| 880 | ;# EFFECTS : Leaves [Scratch] with last sector read or cleared
|
|---|
| 881 | ;# ----------------------------------------------------------------------------
|
|---|
| 882 | ;# IN : DL - BIOS disk number of drive to search
|
|---|
| 883 | ;# ----------------------------------------------------------------------------
|
|---|
| 884 | ;# OUT : CF=1 - found
|
|---|
| 885 | ;# : BX:AX - LBA address of LVM sector if found, 0 otherwise
|
|---|
| 886 | ;##############################################################################
|
|---|
| 887 | DriveIO_LocateMasterLVMSector Proc Near uses cx dx si di ds es
|
|---|
| 888 |
|
|---|
| 889 | IFDEF AUX_DEBUG
|
|---|
| 890 | IF 1
|
|---|
| 891 | DBG_TEXT_OUT_AUX 'DriveIO_LocateMasterLVMSector:'
|
|---|
| 892 | PUSHRF
|
|---|
| 893 | call DEBUG_DumpRegisters
|
|---|
| 894 | ;~ call AuxIO_DumpSector
|
|---|
| 895 | ;~ call AuxIO_DumpParagraph
|
|---|
| 896 | ;~ call AuxIO_TeletypeNL
|
|---|
| 897 | POPRF
|
|---|
| 898 | ENDIF
|
|---|
| 899 | ENDIF
|
|---|
| 900 |
|
|---|
| 901 | ; LBA address to start scanning down from
|
|---|
| 902 | mov cx, 255
|
|---|
| 903 |
|
|---|
| 904 | ; Make sure ES==DS
|
|---|
| 905 | push ds
|
|---|
| 906 | pop es
|
|---|
| 907 |
|
|---|
| 908 | ; Because JCXZ is used, LBA sector 0 is never loaded and checked.
|
|---|
| 909 | ; This is of course no problem since it is the MBR.
|
|---|
| 910 | DriveIO_LocateMasterLVMSector_next:
|
|---|
| 911 | mov si, offset [Scratch] ; Use scratch area to load sectors
|
|---|
| 912 | call ClearSectorBuffer ; Clear the scratch area
|
|---|
| 913 | clc ; Indicate Master LVM sector not found
|
|---|
| 914 | jcxz DriveIO_LocateMasterLVMSector_done
|
|---|
| 915 |
|
|---|
| 916 | ; Read the LBA sector specified in CX
|
|---|
| 917 | mov ax, cx ; LBA low
|
|---|
| 918 | xor bx, bx ; LBA high
|
|---|
| 919 | mov di, ds ; Segment of scratch buffer
|
|---|
| 920 | mov si, offset [Scratch] ; Offset of scratch buffer
|
|---|
| 921 | call DriveIO_ReadSectorLBA ; Read the sector
|
|---|
| 922 | lahf ; Save CF
|
|---|
| 923 | dec cx ; Prepare LBA of next sector to read
|
|---|
| 924 | sahf ; Restore CF
|
|---|
| 925 | ; No need to do any LVM sector validation when read error, read next
|
|---|
| 926 | jc DriveIO_LocateMasterLVMSector_next
|
|---|
| 927 |
|
|---|
| 928 | ; See if the read sector has a valid signature and checksum
|
|---|
| 929 | call LVM_ValidateSector
|
|---|
| 930 |
|
|---|
| 931 | ; NC indicates invalid or none-LVM sector, read next
|
|---|
| 932 | jnc DriveIO_LocateMasterLVMSector_next
|
|---|
| 933 |
|
|---|
| 934 | ; We have found a valid LVM sector !
|
|---|
| 935 | ; So it contains the OS/2 geometry for the disk.
|
|---|
| 936 | ; That means this LVM sector itself must be located on the last sector
|
|---|
| 937 | ; of the SPT value its OS/2 geometery specifies, which, in LBA terms
|
|---|
| 938 | ; is LVM SPT-1 -- let's check that...
|
|---|
| 939 | mov bx, offset [Scratch] ; Offset of the loaded LVM sector
|
|---|
| 940 | mov al, [bx+LocLVM_Secs] ; Get the LVM SPT value (<=255)
|
|---|
| 941 | dec al ; Adjust to LVM LBA
|
|---|
| 942 | mov ah, cl ; Get next LVM LBA to search
|
|---|
| 943 | inc ah ; This one was found here
|
|---|
| 944 | cmp al, ah ; If same, LVM LBA location OK
|
|---|
| 945 | jne DriveIO_LocateMasterLVMSector_next
|
|---|
| 946 |
|
|---|
| 947 | ; The LVM sector we found is at the location it should be on disk,
|
|---|
| 948 | ; so it's almost 99% sure this is the correct one.
|
|---|
| 949 | ; Now we should compare the start and sizes of the partitions in the
|
|---|
| 950 | ; MBR with the partitions specified in this LVM record.
|
|---|
| 951 | ; We'll implement that later after some more research.
|
|---|
| 952 | ; For now we assume this is the correct Master LVM sector for the disk.
|
|---|
| 953 | inc cx ; CX was prepared to read next, correct that
|
|---|
| 954 | stc ; Indicate we have found the Master LVM sector
|
|---|
| 955 |
|
|---|
| 956 | DriveIO_LocateMasterLVMSector_done:
|
|---|
| 957 | mov bx, 0 ; A Master LVM sector always has high LBA=0
|
|---|
| 958 | mov ax, cx ; Low LBA of Master LVM sector
|
|---|
| 959 |
|
|---|
| 960 | ; We leave it up to the caller to store the value in a proper place
|
|---|
| 961 | ret
|
|---|
| 962 | DriveIO_LocateMasterLVMSector EndP
|
|---|
| 963 |
|
|---|
| 964 |
|
|---|
| 965 |
|
|---|
| 966 | ;
|
|---|
| 967 | ; ############################################################
|
|---|
| 968 | ; # Check for a valid MBR-sector to be written to disk #
|
|---|
| 969 | ; ############################################################
|
|---|
| 970 | ;
|
|---|
| 971 | ; In
|
|---|
| 972 | ; --
|
|---|
| 973 | ; DL = Physical Disk
|
|---|
| 974 | ; BX:CX = LBA sector
|
|---|
| 975 | ; DI:SI = Source buffer
|
|---|
| 976 | ;
|
|---|
| 977 | ; Out
|
|---|
| 978 | ; ---
|
|---|
| 979 | ; CY = 1 if invalid MBR in source buffer, 0 if valid
|
|---|
| 980 | ;
|
|---|
| 981 | ; This routine is called when DriveIO_SaveSector attempts to write to the MBR.
|
|---|
| 982 | ; It checks if the sector to be written has some sensible values in certain
|
|---|
| 983 | ; places. In fact, if the sector is written to the boot-disk, the AiR-BOOT
|
|---|
| 984 | ; signature should be present and the partition table should be the same
|
|---|
| 985 | ; as the one at the start of the AiR-BOOT code in memory, except maybe for the
|
|---|
| 986 | ; active flags.
|
|---|
| 987 | ; For other disks, only the active flags are checked to be 00h or 80h and
|
|---|
| 988 | ; the AA55h MBR signature.
|
|---|
| 989 | ;
|
|---|
| 990 | DriveIO_ProtectMBR Proc Near
|
|---|
| 991 | pusha ; Push all registers
|
|---|
| 992 | push es ; Push ES because we need it for string instructions
|
|---|
| 993 | push cs ; Make ES point...
|
|---|
| 994 | pop es ; to CS
|
|---|
| 995 |
|
|---|
| 996 | ; Save the pointer to the sector to write in BX
|
|---|
| 997 | mov bx,si
|
|---|
| 998 |
|
|---|
| 999 | ;
|
|---|
| 1000 | ; If the sector to be written is not the boot-disk, then skip
|
|---|
| 1001 | ; checking the AiR-BOOT MBR.
|
|---|
| 1002 | ;
|
|---|
| 1003 | cmp dl, [BIOS_BootDisk]
|
|---|
| 1004 | jne DriveIO_ProtectMBR_is_not_bootdisk
|
|---|
| 1005 |
|
|---|
| 1006 | ;
|
|---|
| 1007 | ; The boot-disk is accessed so the sector to be written must be
|
|---|
| 1008 | ; the AiR-BOOT MBR. This is the same as the first 512 bytes
|
|---|
| 1009 | ; relocated to 8000:0000 and this the start of the AB-code.
|
|---|
| 1010 | ;
|
|---|
| 1011 | mov si,bx ; Get pointer to sector to write
|
|---|
| 1012 | xor di,di ; Point DI to start of AB-code (MBR)
|
|---|
| 1013 | mov cx, offset [MBR_PartTable] ; Bytes upto P-table must be same
|
|---|
| 1014 | cld ; Compare upwards
|
|---|
| 1015 | repe cmpsb ; Compare upto P-table
|
|---|
| 1016 |
|
|---|
| 1017 | ; If not the same this is not the an AiR-BOOT boot-disk MBR !
|
|---|
| 1018 | jne DriveIO_ProtectMBR_not_valid_MBR ; SEVERE ERROR !
|
|---|
| 1019 |
|
|---|
| 1020 | ; Continue with signature check
|
|---|
| 1021 | jmp DriveIO_ProtectMBR_check_signature
|
|---|
| 1022 |
|
|---|
| 1023 |
|
|---|
| 1024 | ;
|
|---|
| 1025 | ; The disk is not the boot-disk so we don't know what kind of MBR is on it.
|
|---|
| 1026 | ; Some sanity checks should be here.
|
|---|
| 1027 | ;
|
|---|
| 1028 | DriveIO_ProtectMBR_is_not_bootdisk:
|
|---|
| 1029 |
|
|---|
| 1030 | ;
|
|---|
| 1031 | ; sanity checks...
|
|---|
| 1032 | ;
|
|---|
| 1033 |
|
|---|
| 1034 | ; Continue with signature check
|
|---|
| 1035 | jmp DriveIO_ProtectMBR_check_signature
|
|---|
| 1036 |
|
|---|
| 1037 |
|
|---|
| 1038 | DriveIO_ProtectMBR_check_signature:
|
|---|
| 1039 | ; See if the sector to write contains a valid signature
|
|---|
| 1040 | mov si,bx ; Get pointer to sector to write
|
|---|
| 1041 | mov di, offset [MBR_Sig] ; Offset to MBR signature
|
|---|
| 1042 | add si,di ; Make SI point to it in sec to write
|
|---|
| 1043 | lodsw ; Load it
|
|---|
| 1044 | cmp ax,0aa55h ; See if it is valid
|
|---|
| 1045 |
|
|---|
| 1046 | ; If no signature this cannot be a valid MBR !
|
|---|
| 1047 | jne DriveIO_ProtectMBR_not_valid_MBR ; SEVERE ERROR !
|
|---|
| 1048 |
|
|---|
| 1049 |
|
|---|
| 1050 | ;
|
|---|
| 1051 | ; The sector to be written seems to be valid.
|
|---|
| 1052 | ; Set CY=0 to indicate a valid MBR.
|
|---|
| 1053 | ;
|
|---|
| 1054 | DriveIO_ProtectMBR_is_valid_MBR:
|
|---|
| 1055 | clc
|
|---|
| 1056 | jmp DriveIO_ProtectMBR_end
|
|---|
| 1057 |
|
|---|
| 1058 | ;
|
|---|
| 1059 | ; Something is terribly wrong; a non-MBR sector seems about to be written.
|
|---|
| 1060 | ; Set CY=1 and let the calling code handle this situation.
|
|---|
| 1061 | ;
|
|---|
| 1062 | DriveIO_ProtectMBR_not_valid_MBR:
|
|---|
| 1063 | stc
|
|---|
| 1064 | jmp DriveIO_ProtectMBR_end
|
|---|
| 1065 |
|
|---|
| 1066 | ;
|
|---|
| 1067 | ; Return to the caller with no registers modyfied except FLAGS.
|
|---|
| 1068 | ;
|
|---|
| 1069 | DriveIO_ProtectMBR_end:
|
|---|
| 1070 | pop es
|
|---|
| 1071 | popa
|
|---|
| 1072 | ret
|
|---|
| 1073 | DriveIO_ProtectMBR Endp
|
|---|
| 1074 |
|
|---|
| 1075 |
|
|---|
| 1076 |
|
|---|
| 1077 | ; #########################################################################
|
|---|
| 1078 | ; Routine: Checks if the MBR is addressed by either CHS or LBA
|
|---|
| 1079 | ; #########################################################################
|
|---|
| 1080 | ; Calling : bx:ax - Absolute sector
|
|---|
| 1081 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 1082 | ; Returns : ZF=1 if MBR is addressed, else ZF=0
|
|---|
| 1083 | ; Preserve: all registers
|
|---|
| 1084 | ; #########################################################################
|
|---|
| 1085 | DriveIO_MBR_Addressed Proc
|
|---|
| 1086 | push ax
|
|---|
| 1087 | push bx
|
|---|
| 1088 |
|
|---|
| 1089 | or bx,ax ; Results in 0 in BX if MBR is addressed by LBA
|
|---|
| 1090 | jz DriveIO_MBR_Addressed_done
|
|---|
| 1091 |
|
|---|
| 1092 | mov ax,cx ; Results in 1 in AX if CYL 0, SEC 1 is addressed
|
|---|
| 1093 | add al,dh ; Results in 1 in AX if HEAD 0 is addressed
|
|---|
| 1094 | dec ax ; Results in 0 in AX if MBR is addressed by CHS
|
|---|
| 1095 |
|
|---|
| 1096 | DriveIO_MBR_Addressed_done:
|
|---|
| 1097 | pop bx
|
|---|
| 1098 | pop ax
|
|---|
| 1099 | ret
|
|---|
| 1100 | DriveIO_MBR_Addressed EndP
|
|---|
| 1101 |
|
|---|
| 1102 |
|
|---|
| 1103 |
|
|---|
| 1104 |
|
|---|
| 1105 | ; #########################################################################
|
|---|
| 1106 | ; Routine: Writes DS:SI to a specified sector
|
|---|
| 1107 | ; #########################################################################
|
|---|
| 1108 | ; Calling : bx:ax - Absolute sector
|
|---|
| 1109 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 1110 | ; ds:si - Source-Adress
|
|---|
| 1111 | ; Returns : none
|
|---|
| 1112 | ; Preserve: all registers
|
|---|
| 1113 | ; #########################################################################
|
|---|
| 1114 | DriveIO_SaveSector Proc Near Uses ax bx cx dx ds si es di
|
|---|
| 1115 |
|
|---|
| 1116 | IFDEF AUX_DEBUG
|
|---|
| 1117 | IF 0
|
|---|
| 1118 | DBG_TEXT_OUT_AUX 'DriveIO_SaveSector:'
|
|---|
| 1119 | PUSHRF
|
|---|
| 1120 | ;~ call DEBUG_DumpRegisters
|
|---|
| 1121 | ;~ call AuxIO_DumpParagraph
|
|---|
| 1122 | ;~ call AuxIO_TeletypeNL
|
|---|
| 1123 | POPRF
|
|---|
| 1124 | ENDIF
|
|---|
| 1125 | ENDIF
|
|---|
| 1126 |
|
|---|
| 1127 |
|
|---|
| 1128 | ;!
|
|---|
| 1129 | ;! DEBUG_BLOCK
|
|---|
| 1130 | ;! Force write to LBA0 to test interception routine.
|
|---|
| 1131 | ;! Do *NOT* enable unless you are debugging, will overwrite MBR !
|
|---|
| 1132 | ;!
|
|---|
| 1133 | IFDEF AUX_DEBUG
|
|---|
| 1134 | IF 0
|
|---|
| 1135 | pushf
|
|---|
| 1136 | pusha
|
|---|
| 1137 | xor ax,ax
|
|---|
| 1138 | xor bx,bx
|
|---|
| 1139 | xor cx,cx
|
|---|
| 1140 | inc cx
|
|---|
| 1141 | xor dh,dh
|
|---|
| 1142 | popa
|
|---|
| 1143 | popf
|
|---|
| 1144 | ENDIF
|
|---|
| 1145 | ENDIF
|
|---|
| 1146 |
|
|---|
| 1147 | ;
|
|---|
| 1148 | ; Check if the MBR is the destination for the write.
|
|---|
| 1149 | ; ZF=1 if so.
|
|---|
| 1150 | ;
|
|---|
| 1151 | call DriveIO_MBR_Addressed
|
|---|
| 1152 | jnz DriveIO_SaveSector_continue_write
|
|---|
| 1153 |
|
|---|
| 1154 |
|
|---|
| 1155 | ; MBR is addressed, check the sector that is requested to be written.
|
|---|
| 1156 | ; For the bootdisk it should contain the AiR-BOOT signature, valid
|
|---|
| 1157 | ; partition-table entries and the AA55h signature.
|
|---|
| 1158 | ; If not, something is terribly wrong in some piece of the AB code.
|
|---|
| 1159 | ; For any other disk (80h+) at least a valid partition table should
|
|---|
| 1160 | ; be present together with the AA55h signature.
|
|---|
| 1161 | call DriveIO_ProtectMBR
|
|---|
| 1162 | jnc DriveIO_SaveSector_continue_write
|
|---|
| 1163 |
|
|---|
| 1164 |
|
|---|
| 1165 | ;
|
|---|
| 1166 | ; WE HAVE A SEVERE ERROR CONDITION !
|
|---|
| 1167 | ; SOME AB CODE TRIES TO WRITE A NON-MBR TO THE DISK !
|
|---|
| 1168 | ; ASK THE USER TO REPORT THIS !
|
|---|
| 1169 | ; HALT THE SYSTEM !
|
|---|
| 1170 | ;
|
|---|
| 1171 |
|
|---|
| 1172 | ; Show error-box
|
|---|
| 1173 | mov cx, 0C04h
|
|---|
| 1174 | mov si, offset NonMBRwrite
|
|---|
| 1175 | call SETUP_ShowErrorBox
|
|---|
| 1176 | mov cx, 0C04h
|
|---|
| 1177 | mov si, offset NonMBRwrite_rep
|
|---|
| 1178 | call SETUP_ShowErrorBox
|
|---|
| 1179 |
|
|---|
| 1180 |
|
|---|
| 1181 | IFDEF AUX_DEBUG
|
|---|
| 1182 | IF 0
|
|---|
| 1183 | pushf
|
|---|
| 1184 | pusha
|
|---|
| 1185 | mov si, offset [NonMBRwrite]
|
|---|
| 1186 | call AuxIO_TeletypeNL
|
|---|
| 1187 | call AuxIO_Print
|
|---|
| 1188 | call AuxIO_TeletypeNL
|
|---|
| 1189 | popa
|
|---|
| 1190 | popf
|
|---|
| 1191 | ENDIF
|
|---|
| 1192 | ENDIF
|
|---|
| 1193 |
|
|---|
| 1194 | ; Show popup and halt the system.
|
|---|
| 1195 | jmp HaltSystem
|
|---|
| 1196 |
|
|---|
| 1197 |
|
|---|
| 1198 |
|
|---|
| 1199 | ;
|
|---|
| 1200 | ; Continue the write if not MBR sector or MBR to write is validated.
|
|---|
| 1201 | ;
|
|---|
| 1202 | DriveIO_SaveSector_continue_write:
|
|---|
| 1203 | test byte ptr cs:[CurIO_UseExtension], 1
|
|---|
| 1204 | jz DIOSS_UseNormal
|
|---|
| 1205 | ; Are we forced do use LBA via Setting?
|
|---|
| 1206 | ; Always use INT13X on v1.0.8+.
|
|---|
| 1207 | ;~ test byte ptr cs:[CFG_ForceLBAUsage], 1
|
|---|
| 1208 | ;~ jnz DIOSS_UseExtension
|
|---|
| 1209 | jmp DIOSS_UseExtension
|
|---|
| 1210 | ; Is the drive not a harddrive?
|
|---|
| 1211 | cmp dl, 80h
|
|---|
| 1212 | jb DIOSS_UseNormal
|
|---|
| 1213 | ; Upper 8 bits of LBA-address set? -> Use LBA (maximum boundary is FB0400h)
|
|---|
| 1214 | or bh, bh
|
|---|
| 1215 | jnz DIOSS_UseExtension
|
|---|
| 1216 | ; Compare Switch-Table value to bit 16-23 of LBA-address
|
|---|
| 1217 | mov di, dx
|
|---|
| 1218 | and di, 007Fh
|
|---|
| 1219 | cmp bptr cs:[LBASwitchTable+di], bl
|
|---|
| 1220 | jbe DIOSS_UseExtension
|
|---|
| 1221 |
|
|---|
| 1222 | DIOSS_UseNormal:
|
|---|
| 1223 |
|
|---|
| 1224 | IFDEF AUX_DEBUG
|
|---|
| 1225 | IF 0
|
|---|
| 1226 | DBG_TEXT_OUT_AUX 'DriveIO_WriteSectorCHS:'
|
|---|
| 1227 | PUSHRF
|
|---|
| 1228 | call DEBUG_DumpRegisters
|
|---|
| 1229 | call AuxIO_DumpParagraph
|
|---|
| 1230 | call AuxIO_TeletypeNL
|
|---|
| 1231 | POPRF
|
|---|
| 1232 | ENDIF
|
|---|
| 1233 | ENDIF
|
|---|
| 1234 |
|
|---|
| 1235 | mov di, 3 ; retry count
|
|---|
| 1236 | DIOSS_ErrorLoop:
|
|---|
| 1237 | push ds
|
|---|
| 1238 | pop es
|
|---|
| 1239 | mov bx, si ; ES:BX - Destination
|
|---|
| 1240 | mov ax, 0301h ; Function 3 - Write Sector
|
|---|
| 1241 | int 13h
|
|---|
| 1242 | jnc DIOSS_Success
|
|---|
| 1243 | dec di ; decrement retry count
|
|---|
| 1244 | jnz DIOSS_ErrorLoop
|
|---|
| 1245 | call MBR_SaveError
|
|---|
| 1246 |
|
|---|
| 1247 | DIOSS_UseExtension:
|
|---|
| 1248 |
|
|---|
| 1249 | mov di, ds ; segment for transfer address
|
|---|
| 1250 | call DriveIO_WriteSectorLBA ; extended write
|
|---|
| 1251 | jc MBR_SaveError ; halt on error
|
|---|
| 1252 |
|
|---|
| 1253 | ;~ push cx
|
|---|
| 1254 | ;~ mov cs:[INT13X_DAP_NumBlocks], 1 ; Copy ONE sector
|
|---|
| 1255 | ;~ mov wptr cs:[INT13X_DAP_Transfer+0], si
|
|---|
| 1256 | ;~ mov cx, ds
|
|---|
| 1257 | ;~ mov wptr cs:[INT13X_DAP_Transfer+2], cx ; Fill out Transfer Adress
|
|---|
| 1258 | ;~ mov wptr cs:[INT13X_DAP_Absolute+0], ax
|
|---|
| 1259 | ;~ mov wptr cs:[INT13X_DAP_Absolute+2], bx ; Fill out Absolute Sector
|
|---|
| 1260 | ;~ push cs
|
|---|
| 1261 | ;~ pop ds
|
|---|
| 1262 | ;~ mov si, offset [INT13X_DAP]
|
|---|
| 1263 | ;~ mov ax, 4300h ; Extended Write (No Verify)
|
|---|
| 1264 | ;~ int 13h
|
|---|
| 1265 | ;~ pop cx
|
|---|
| 1266 | ;~ jnc DIOSS_Success
|
|---|
| 1267 | ;~ call MBR_SaveError
|
|---|
| 1268 |
|
|---|
| 1269 | DIOSS_Success:
|
|---|
| 1270 | ret
|
|---|
| 1271 | DriveIO_SaveSector EndP
|
|---|
| 1272 |
|
|---|
| 1273 |
|
|---|
| 1274 |
|
|---|
| 1275 | ; ------------------------------------------------------
|
|---|
| 1276 | ; Rousseau: # Load the master LVM-sector if one exists #
|
|---|
| 1277 | ; ------------------------------------------------------
|
|---|
| 1278 | ; Load the master LVM-sector to get the number of sectors per track as
|
|---|
| 1279 | ; OS/2 views the drive. If no master LVM-sector is found it is assumed OS/2
|
|---|
| 1280 | ; is not installed. The master LVM-sector can be located at three different
|
|---|
| 1281 | ; places depending on drive size and partitioning scheme and driver used.
|
|---|
| 1282 | ; When DANIS506.ADD is used, the OS/2 extended geometry will be 255/127 for
|
|---|
| 1283 | ; drives >502GiB but <1TiB. Then the location will be sector 127 which
|
|---|
| 1284 | ; is LBA 126 (7Eh).
|
|---|
| 1285 | ; IBM1S506.ADD will always use 255/255 for the extended OS/2 geometry.
|
|---|
| 1286 | ; DANIS506.ADD will use 255/255 for drives >1TiB.
|
|---|
| 1287 | ; Then the location of the master LVM-sector will be 255 which is LBA 254 (FEh).
|
|---|
| 1288 | ; When OS/2 is installed on a huge drive that alread had a system on it, OS/2
|
|---|
| 1289 | ; will be confined to the lower 502GiB of the drive.
|
|---|
| 1290 | ; In this case the normal geometry from Int13X will be used.
|
|---|
| 1291 | ; This is also the case when no valid master LVM-sector can be found.
|
|---|
| 1292 | ;
|
|---|
| 1293 | ; Return CF when valid master LVM sector found, NC if not.
|
|---|
| 1294 | ; Loads sector at [LVMSector] !
|
|---|
| 1295 | DriveIO_LoadMasterLVMSector Proc Near
|
|---|
| 1296 |
|
|---|
| 1297 | IFDEF AUX_DEBUG
|
|---|
| 1298 | IF 0
|
|---|
| 1299 | DBG_TEXT_OUT_AUX 'DriveIO_LoadMasterLVMSector:'
|
|---|
| 1300 | PUSHRF
|
|---|
| 1301 | ;~ call DEBUG_DumpRegisters
|
|---|
| 1302 | ;~ call AuxIO_DumpParagraph
|
|---|
| 1303 | ;~ call AuxIO_TeletypeNL
|
|---|
| 1304 | POPRF
|
|---|
| 1305 | ENDIF
|
|---|
| 1306 | ENDIF
|
|---|
| 1307 |
|
|---|
| 1308 | pusha
|
|---|
| 1309 |
|
|---|
| 1310 | ; Loop over the sector-translation table,
|
|---|
| 1311 | ; process the first three values from high (255) to low.
|
|---|
| 1312 | ; (bios spt, most likely 63)
|
|---|
| 1313 | mov cx,3
|
|---|
| 1314 | DriveIO_LoadMasterLVMSector_NextTry:
|
|---|
| 1315 | ; Number of sectors to read
|
|---|
| 1316 | mov [INT13X_DAP_NumBlocks],1
|
|---|
| 1317 |
|
|---|
| 1318 | ; Setup destination address
|
|---|
| 1319 | mov si, offset [LVMSector]
|
|---|
| 1320 | mov word ptr [INT13X_DAP_Transfer+0],si
|
|---|
| 1321 | mov ax, ds
|
|---|
| 1322 | mov word ptr [INT13X_DAP_Transfer+2],ax
|
|---|
| 1323 |
|
|---|
| 1324 | ; Get the sector-number of the next possible LVM sector (255,127,63)
|
|---|
| 1325 | ; using the translation table and the counter as the index
|
|---|
| 1326 | mov bx,offset [secs_per_track_table]
|
|---|
| 1327 | mov ax,cx ; 1-based index to sec_per_track_table
|
|---|
| 1328 | dec ax ; Adjust to 0-based
|
|---|
| 1329 | xlatb ; Get the (well known) SPT
|
|---|
| 1330 | dec al ; Minus 1 for LVM-record
|
|---|
| 1331 |
|
|---|
| 1332 | ;
|
|---|
| 1333 | ; AX now contains the LBA address of the sector
|
|---|
| 1334 | ; that could be an LVM sector.
|
|---|
| 1335 | ; This is all in track0 so the address will not exceed 64kiB sectors.
|
|---|
| 1336 | ;
|
|---|
| 1337 |
|
|---|
| 1338 |
|
|---|
| 1339 | IFDEF AUX_DEBUG
|
|---|
| 1340 | IF 0
|
|---|
| 1341 | DBG_TEXT_OUT_AUX 'geo'
|
|---|
| 1342 | PUSHRF
|
|---|
| 1343 | call DEBUG_DumpRegisters
|
|---|
| 1344 | call AuxIO_DumpParagraph
|
|---|
| 1345 | call AuxIO_TeletypeNL
|
|---|
| 1346 | POPRF
|
|---|
| 1347 | ENDIF
|
|---|
| 1348 | ENDIF
|
|---|
| 1349 |
|
|---|
| 1350 |
|
|---|
| 1351 | ; Setup the requested LBA sector number
|
|---|
| 1352 | mov word ptr [INT13X_DAP_Absolute+0],ax ; LBA low NORMAL I/O GEBRUIKEN !
|
|---|
| 1353 | mov word ptr [INT13X_DAP_Absolute+2],00h ; LBA high
|
|---|
| 1354 | mov si, offset [INT13X_DAP] ; address request packet
|
|---|
| 1355 | mov ah, 42h
|
|---|
| 1356 | int 13h ; do the i/o, CF=1->error, CF=0->success
|
|---|
| 1357 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
|
|---|
| 1358 | IFDEF AUX_DEBUG
|
|---|
| 1359 | IF 0
|
|---|
| 1360 | pushf
|
|---|
| 1361 | pusha
|
|---|
| 1362 | pushf
|
|---|
| 1363 | xor ax, ax
|
|---|
| 1364 | mov al, dl
|
|---|
| 1365 | call AuxIO_TeletypeHexWord
|
|---|
| 1366 | mov al, '#'
|
|---|
| 1367 | call AuxIO_Teletype
|
|---|
| 1368 | popf
|
|---|
| 1369 | mov ax,0000h
|
|---|
| 1370 | rcl al, 1
|
|---|
| 1371 | call AuxIO_TeletypeHexWord
|
|---|
| 1372 | mov al, '#'
|
|---|
| 1373 | call AuxIO_Teletype
|
|---|
| 1374 | mov ax,word ptr [INT13X_DAP_Absolute+0]
|
|---|
| 1375 | call AuxIO_TeletypeHexWord
|
|---|
| 1376 | mov al, '#'
|
|---|
| 1377 | call AuxIO_Teletype
|
|---|
| 1378 | popa
|
|---|
| 1379 | popf
|
|---|
| 1380 | ENDIF
|
|---|
| 1381 | ENDIF
|
|---|
| 1382 |
|
|---|
| 1383 | cmc ; Complement carry so we can exit imm. on error
|
|---|
| 1384 | jnc DriveIO_LoadMasterLVMSector_End ; oops, return with NC
|
|---|
| 1385 |
|
|---|
| 1386 |
|
|---|
| 1387 | mov si,offset [LVMSector]
|
|---|
| 1388 |
|
|---|
| 1389 | ; See if this is a valid LVM-sector
|
|---|
| 1390 | ; CY if valid
|
|---|
| 1391 | call LVM_ValidateSector
|
|---|
| 1392 |
|
|---|
| 1393 |
|
|---|
| 1394 |
|
|---|
| 1395 | IFDEF AUX_DEBUG
|
|---|
| 1396 | IF 0
|
|---|
| 1397 | DBG_TEXT_OUT_AUX 'lvm record'
|
|---|
| 1398 | PUSHRF
|
|---|
| 1399 | call DEBUG_DumpRegisters
|
|---|
| 1400 | ;~ call AuxIO_DumpSector
|
|---|
| 1401 | mov cx, 7
|
|---|
| 1402 | @@:
|
|---|
| 1403 | call AuxIO_DumpParagraph
|
|---|
| 1404 | call AuxIO_TeletypeNL
|
|---|
| 1405 | add si, 16
|
|---|
| 1406 | loop @B
|
|---|
| 1407 | POPRF
|
|---|
| 1408 | ENDIF
|
|---|
| 1409 | ENDIF
|
|---|
| 1410 |
|
|---|
| 1411 |
|
|---|
| 1412 | ; Yep, we found the master LVM-sector
|
|---|
| 1413 | jc DriveIO_LoadMasterLVMSector_Found
|
|---|
| 1414 |
|
|---|
| 1415 | ; Try next location
|
|---|
| 1416 | loop DriveIO_LoadMasterLVMSector_NextTry
|
|---|
| 1417 |
|
|---|
| 1418 | ; No master LVM-sector found, set CF=false
|
|---|
| 1419 | clc
|
|---|
| 1420 |
|
|---|
| 1421 | DriveIO_LoadMasterLVMSector_Found:
|
|---|
| 1422 | ; Store the address for later use.
|
|---|
| 1423 | mov ax, word ptr [INT13X_DAP_Absolute]
|
|---|
| 1424 | mov word ptr [MasterLVMLBA], ax
|
|---|
| 1425 |
|
|---|
| 1426 | DriveIO_LoadMasterLVMSector_End:
|
|---|
| 1427 | popa
|
|---|
| 1428 | ret
|
|---|
| 1429 | DriveIO_LoadMasterLVMSector Endp
|
|---|
| 1430 |
|
|---|
| 1431 |
|
|---|
| 1432 |
|
|---|
| 1433 |
|
|---|
| 1434 | ; ---------------------------------------------------
|
|---|
| 1435 | ; Rousseau ## Large drives, (OS/2) geometry and LBA ##
|
|---|
| 1436 | ; ---------------------------------------------------
|
|---|
| 1437 | ; A sector size of 512 bytes is assumed in the below calculations.
|
|---|
| 1438 | ; Note that this scheme changes when the sector size will be 4096 or larger,
|
|---|
| 1439 | ; like with modern drives that do not translate to 512 bytes per sector anymore.
|
|---|
| 1440 | ; These drives will have a capacity above the 2TiB LBA32 boundary.
|
|---|
| 1441 | ; For now, we assume drives <=2TiB with a sector size of 512 bytes.
|
|---|
| 1442 |
|
|---|
| 1443 | ; There are a few boundaries that are of importance.
|
|---|
| 1444 | ; Note that these are disk-boundaries and not partition boundaries.
|
|---|
| 1445 | ; Even with a small partition, like <502GiB, OS/2 will use extended geometry on
|
|---|
| 1446 | ; an empty huge disk.
|
|---|
| 1447 | ; These boundaries are (from high to low):
|
|---|
| 1448 |
|
|---|
| 1449 | ; (code 5)
|
|---|
| 1450 | ; 2^32 = 4294967296 = 100000000 sectors = 2048 GiB
|
|---|
| 1451 | ; This is the LBA32 2TiB boundary.
|
|---|
| 1452 | ; Everything above it must be addressed using LBA48.
|
|---|
| 1453 | ; OS/2 can currently not address this space above.
|
|---|
| 1454 |
|
|---|
| 1455 | ; (code4)
|
|---|
| 1456 | ; 65536*255*255 = 4261478400 = FE010000 sectors ~ 2032 GiB
|
|---|
| 1457 | ; This is the max OS/2 boundary using 255/255 extended geometry.
|
|---|
| 1458 | ; OS/2 can currently not address this space above.
|
|---|
| 1459 |
|
|---|
| 1460 | ; (code 3)
|
|---|
| 1461 | ; 2^31 = 2147483648 = 80000000 sectors = 1024 GiB
|
|---|
| 1462 | ; This is the LBA32 1TiB boundary.
|
|---|
| 1463 | ; OS/2 can address this space and will use 255/255 extended geometry.
|
|---|
| 1464 |
|
|---|
| 1465 | ; (code 2)
|
|---|
| 1466 | ; 65536*255*127 = 2122383360 = 7E810000 sectors ~ 1012 GiB
|
|---|
| 1467 | ; This is the DANI 1TiB boundary.
|
|---|
| 1468 | ; OS/2 can address this space and will use 255/255 extended geometry.
|
|---|
| 1469 | ; Below this DANI will use 255/127 extended geometry.
|
|---|
| 1470 | ; This matters on where the LVM-sectors are located !
|
|---|
| 1471 |
|
|---|
| 1472 | ; (code 1)
|
|---|
| 1473 | ; 65536*255*63 = 1052835840 = 3EC10000 sectors ~ 502 GiB
|
|---|
| 1474 | ; This is the current OS/2 limit using this geometry because OS/2 can
|
|---|
| 1475 | ; currently not address more than 65536 cylinders.
|
|---|
| 1476 | ; DANI will address space above with 255/127 extended geometry up until
|
|---|
| 1477 | ; the DANI 1TiB boundary (code 2)
|
|---|
| 1478 |
|
|---|
| 1479 | ; (code 0)
|
|---|
| 1480 | ; Everything below 65536*255*63 will be addressed using standard geometry.
|
|---|
| 1481 |
|
|---|
| 1482 |
|
|---|
| 1483 | ;
|
|---|
| 1484 | ; This function will return the following values:
|
|---|
| 1485 | ;
|
|---|
| 1486 |
|
|---|
| 1487 | ; 5 = This drive is above the 2^32 LBA32 (2TB) boundary and has more
|
|---|
| 1488 | ; than 4294967296 sectors.
|
|---|
| 1489 | ; LBA48 addressing is needed to access the complete capacity of the drive.
|
|---|
| 1490 | ; OS/2 is currently unable to do so.
|
|---|
| 1491 |
|
|---|
| 1492 | ; 4 = This drive is above the 65536*255*255 (4261478400) boundary but below 2^32.
|
|---|
| 1493 | ; This is an OS/2 boundary and OS/2 is not able to access the drive above
|
|---|
| 1494 | ; this boundary.
|
|---|
| 1495 |
|
|---|
| 1496 | ; 3 = This drive is above the 2^31 (1TB) boundary and has more than
|
|---|
| 1497 | ; 2147483648 sectors.
|
|---|
| 1498 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1499 | ; Both DANIS506 and IBM1S506 will use the 255/255 scheme.
|
|---|
| 1500 |
|
|---|
| 1501 | ; 2 = This drive is above the 65536*255*127 (2122383360) boundary but below 2^31.
|
|---|
| 1502 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1503 | ; Both DANIS506 and IBM1S506 will use the 255/255 scheme.
|
|---|
| 1504 |
|
|---|
| 1505 | ; 1 = This drive is above the 65536*255*63 (1052835840) boundary but
|
|---|
| 1506 | ; below 65536*255*127.
|
|---|
| 1507 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1508 | ; Note that DANIS506 will use 255/127 and IBM1S506 will use 255/255 geometry !
|
|---|
| 1509 | ; Using DANI or IBM influences the location of the LVM info-sectors !
|
|---|
| 1510 |
|
|---|
| 1511 | ; 0 = This drive is below the 65536*255*63 (1052835840) boundary.
|
|---|
| 1512 | ; OS/2 is able to access this drive using the standard 255/63 geometry.
|
|---|
| 1513 |
|
|---|
| 1514 | ; So, any return value >0 means OS/2 extended geometry will be used.
|
|---|
| 1515 | ; Value 1 will use 255/127 with DANIS506 but 255/255 with IBM1S506.
|
|---|
| 1516 | ; Values 2 and 3 will use 255/255 on both drivers.
|
|---|
| 1517 | ; You can or with 0x01 and check for 3 in this case.
|
|---|
| 1518 | ; Any value above 3 will be a drive who's capacity cannot be fully used by OS/2
|
|---|
| 1519 | ; The upper limit of 65536*255*255 will be in effect here.
|
|---|
| 1520 |
|
|---|
| 1521 | ; Note this function currently handles the boot-drive only !
|
|---|
| 1522 | ; It should be extended and use dl for the drive-number as a parameter.
|
|---|
| 1523 | ; Because we use this function to get this info in a number of places,
|
|---|
| 1524 | ; all regs and flags except AX are saved and restored.
|
|---|
| 1525 |
|
|---|
| 1526 | ; DL contains BIOS disk-number; 80h for first, 81h for second, etc.
|
|---|
| 1527 | DriveIO_GatherDiskInfo Proc Near
|
|---|
| 1528 |
|
|---|
| 1529 | IFDEF AUX_DEBUG
|
|---|
| 1530 | IF 0
|
|---|
| 1531 | DBG_TEXT_OUT_AUX 'DriveIO_GatherDiskInfo:'
|
|---|
| 1532 | PUSHRF
|
|---|
| 1533 | call DEBUG_DumpRegisters
|
|---|
| 1534 | ;~ call AuxIO_DumpParagraph
|
|---|
| 1535 | ;~ call AuxIO_TeletypeNL
|
|---|
| 1536 | POPRF
|
|---|
| 1537 | ENDIF
|
|---|
| 1538 | ENDIF
|
|---|
| 1539 |
|
|---|
| 1540 | pushf
|
|---|
| 1541 | push bx
|
|---|
| 1542 | push cx
|
|---|
| 1543 | push dx
|
|---|
| 1544 | push si
|
|---|
| 1545 | push di
|
|---|
| 1546 | push es
|
|---|
| 1547 |
|
|---|
| 1548 | ; Set ES to CS for buffer clearing
|
|---|
| 1549 | push cs
|
|---|
| 1550 | pop es
|
|---|
| 1551 |
|
|---|
| 1552 | ; Clear the buffer
|
|---|
| 1553 | ; Also setup the buffer size.
|
|---|
| 1554 | ; Old Phoenix BIOSses require word (flags) at 02 to be zero,
|
|---|
| 1555 | ; so we clear the whole buffer to be sure.
|
|---|
| 1556 | mov cx, i13xbuf_size ; Dynamically calculated by assembler.
|
|---|
| 1557 | mov di, offset [i13xbuf] ; Points to size field.
|
|---|
| 1558 | mov [di],cx ; Setup buffer-size.
|
|---|
| 1559 | inc di
|
|---|
| 1560 | inc di ; Now pointing at actual buffer.
|
|---|
| 1561 | xor ah,ah ; Fill value.
|
|---|
| 1562 | cld ; Direction up.
|
|---|
| 1563 | rep stosb ; Clear buffer.
|
|---|
| 1564 |
|
|---|
| 1565 | ; Get the drive parameters
|
|---|
| 1566 | mov ah, 48h ; Get Drive Parameters (extended version)
|
|---|
| 1567 | ;mov dl, 80h ; Drive number
|
|---|
| 1568 | mov si, offset [i13xbuf] ; Buffer for result-info
|
|---|
| 1569 | push dx
|
|---|
| 1570 | int 13h ; Call the BIOS-function
|
|---|
| 1571 | pop dx
|
|---|
| 1572 |
|
|---|
| 1573 | ; Do some error-checking
|
|---|
| 1574 | or ah,ah ; AH is zero if no error (ZF=1 if no error)
|
|---|
| 1575 | mov ax,0 ; Setup code for non-huge drive (does not influence ZF)
|
|---|
| 1576 | jz DriveIO_GatherDiskInfo_ok ; Return if error (AL<>0 thus ZF=0) but CY not set, assuming non-huge drive
|
|---|
| 1577 | jnc DriveIO_GatherDiskInfo_ok ; Return if error (CY=1), assuming non-huge drive
|
|---|
| 1578 | jmp DriveIO_GatherDiskInfo_ret
|
|---|
| 1579 |
|
|---|
| 1580 |
|
|---|
| 1581 | DriveIO_GatherDiskInfo_ok:
|
|---|
| 1582 |
|
|---|
| 1583 | ;
|
|---|
| 1584 | ; Store the drive geometry
|
|---|
| 1585 | ;
|
|---|
| 1586 |
|
|---|
| 1587 | mov si, offset i13xbuf
|
|---|
| 1588 |
|
|---|
| 1589 | xor dh,dh
|
|---|
| 1590 | and dl,01111111b
|
|---|
| 1591 | shl dx,1
|
|---|
| 1592 | shl dx,1
|
|---|
| 1593 |
|
|---|
| 1594 | ; Store number of cylinders on disk
|
|---|
| 1595 | mov bx, offset BIOS_Cyls
|
|---|
| 1596 | add bx,dx
|
|---|
| 1597 | mov ax,[si+04h]
|
|---|
| 1598 |
|
|---|
| 1599 | mov word ptr [bx+00],ax
|
|---|
| 1600 | mov ax,[si+06]
|
|---|
| 1601 | mov word ptr [bx+02],ax
|
|---|
| 1602 |
|
|---|
| 1603 | ; Store number of heads per cylinder
|
|---|
| 1604 | mov bx, offset BIOS_Heads
|
|---|
| 1605 | add bx,dx
|
|---|
| 1606 | mov ax,[si+08h]
|
|---|
| 1607 | mov word ptr [bx+00],ax
|
|---|
| 1608 | mov ax,[si+0ah]
|
|---|
| 1609 | mov word ptr [bx+02],ax
|
|---|
| 1610 |
|
|---|
| 1611 | ; Store number of sectors per track
|
|---|
| 1612 | mov bx, offset BIOS_Secs
|
|---|
| 1613 | add bx,dx
|
|---|
| 1614 | mov ax,[si+0ch]
|
|---|
| 1615 | mov word ptr [bx+00],ax
|
|---|
| 1616 |
|
|---|
| 1617 | ; Update first byte of translation-table to conform to BIOS SPT
|
|---|
| 1618 | ; rousseau.comment.201610122010
|
|---|
| 1619 | ; Very bad !!
|
|---|
| 1620 | ; This table is global and the instruction below would change the
|
|---|
| 1621 | ; first (last checked) 'well known' SPT value to the SPT value of
|
|---|
| 1622 | ; the last disk scanned. This goes wrong when the last disk scanned
|
|---|
| 1623 | ; has a SPT <63, which is often the case when an USB stick is present
|
|---|
| 1624 | ; when AirBoot starts.
|
|---|
| 1625 | ;~ mov byte ptr [secs_per_track_table], al
|
|---|
| 1626 |
|
|---|
| 1627 | mov ax,[si+0eh]
|
|---|
| 1628 | mov word ptr [bx+02],ax
|
|---|
| 1629 |
|
|---|
| 1630 | ; Store total secs
|
|---|
| 1631 | mov bx, offset [BIOS_TotalSecs]
|
|---|
| 1632 | add bx,dx
|
|---|
| 1633 | add bx,dx
|
|---|
| 1634 | mov ax,[si+10h]
|
|---|
| 1635 |
|
|---|
| 1636 | mov word ptr [bx+00],ax
|
|---|
| 1637 | mov ax,[si+12h]
|
|---|
| 1638 | mov word ptr [bx+02],ax
|
|---|
| 1639 | mov ax,[si+14h]
|
|---|
| 1640 | mov word ptr [bx+04],ax
|
|---|
| 1641 | mov ax,[si+18h]
|
|---|
| 1642 | mov word ptr [bx+06],ax
|
|---|
| 1643 |
|
|---|
| 1644 | ; Store number of bytes per sector
|
|---|
| 1645 | mov bx, offset [BIOS_Bytes]
|
|---|
| 1646 | add bx,dx
|
|---|
| 1647 | mov ax,[si+18h]
|
|---|
| 1648 | mov [bx],ax
|
|---|
| 1649 |
|
|---|
| 1650 |
|
|---|
| 1651 | ;
|
|---|
| 1652 | ; See of it's a huge drive of not
|
|---|
| 1653 | ;
|
|---|
| 1654 |
|
|---|
| 1655 | ; Drive is larger than 2TiB
|
|---|
| 1656 | mov ax,5 ; Drive code (5)
|
|---|
| 1657 | mov bx, [si+14h] ; Low word of high dword of sector-count
|
|---|
| 1658 | or bx, [si+16h] ; High word of high dword of sector-count
|
|---|
| 1659 | jnz DriveIO_GatherDiskInfo_ret ; If non-zero we have a drive with >2^32 sectors and thus LBA48 addressing
|
|---|
| 1660 |
|
|---|
| 1661 | ; Drive is larger than max OS/2 capacity
|
|---|
| 1662 | dec ax ; Drive code (4)
|
|---|
| 1663 | mov bx, [si+12h] ; High word of low dword of sector-count
|
|---|
| 1664 | cmp bx, 0fe01h ; Boundary
|
|---|
| 1665 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1666 | ; we have a drive larger than to 65536*255*255 = FE010000 sectors
|
|---|
| 1667 |
|
|---|
| 1668 | ; Drive can be completely utilized by OS/2
|
|---|
| 1669 | dec ax ; Drive code (3)
|
|---|
| 1670 | cmp bx, 8000h ; Boundary
|
|---|
| 1671 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1672 | ; we have a drive larger than 2^31 sectors but smaller than 65536*255*255
|
|---|
| 1673 |
|
|---|
| 1674 | ; This is the small area between DANI 1TiB and LBA 1TiB
|
|---|
| 1675 | dec ax ; Drive code (2)
|
|---|
| 1676 | cmp bx, 7e81h ; Boundary
|
|---|
| 1677 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1678 | ; we have a drive larger than 65536*255*127 but <65536*255*255
|
|---|
| 1679 | ; DANIS506.ADD will use 255/255 extended geometry
|
|---|
| 1680 |
|
|---|
| 1681 | ; DANI will use 255/127 in this area, this could impact the location of LVM-sectors ! (last sec on track)
|
|---|
| 1682 | dec ax ; Drive code (1)
|
|---|
| 1683 | cmp bx, 3ec1h ; Boundary
|
|---|
| 1684 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1685 | ; we have a drive larger than 65536*255*63 sectors (OS/2 502GiB Limit!)
|
|---|
| 1686 | ; DANIS506.ADD will use 255/127 extended geometry !
|
|---|
| 1687 | ; IBM1S506.ADD will use 255/255 extended geometry !
|
|---|
| 1688 |
|
|---|
| 1689 | ; We have a drive that can be addressed using standard 255/63 geometry
|
|---|
| 1690 | dec ax ; Drive code (0)
|
|---|
| 1691 | ; We have a drive smaller than 65536*255*63 = 3EC10000 sectors
|
|---|
| 1692 |
|
|---|
| 1693 | DriveIO_GatherDiskInfo_ret:
|
|---|
| 1694 | pop es
|
|---|
| 1695 | pop di
|
|---|
| 1696 | pop si
|
|---|
| 1697 | pop dx
|
|---|
| 1698 | pop cx
|
|---|
| 1699 | pop bx
|
|---|
| 1700 |
|
|---|
| 1701 | mov byte ptr [CurIO_UseExtension],1
|
|---|
| 1702 |
|
|---|
| 1703 | popf
|
|---|
| 1704 | ret
|
|---|
| 1705 | DriveIO_GatherDiskInfo EndP
|
|---|
| 1706 |
|
|---|
| 1707 |
|
|---|
| 1708 | ;------------------------------------------------------------------------------
|
|---|
| 1709 | ; Check if the BIOS disk number in DL is a harddisk and in range
|
|---|
| 1710 | ;------------------------------------------------------------------------------
|
|---|
| 1711 | ; IN : DL BIOS disk number (80h etc)
|
|---|
| 1712 | ; OUT : CF=1 if invalid disk number or out of range
|
|---|
| 1713 | ; NOTE : Only modifies flags
|
|---|
| 1714 | ;------------------------------------------------------------------------------
|
|---|
| 1715 | DriveIO_IsValidHarddisk Proc Near Uses dx
|
|---|
| 1716 | cmp dl, 80h ; BIOS disk number must be at least 80h
|
|---|
| 1717 | jb @F ; Not a harddisk, exit with CY
|
|---|
| 1718 | mov dh, dl ; Save to do compare
|
|---|
| 1719 | sub dh, 80h ; Now 0 based disk number
|
|---|
| 1720 | inc dh ; Now 1 based disk number
|
|---|
| 1721 | cmp [TotalHarddiscs], dh ; Out of range, exit with CY
|
|---|
| 1722 | @@: ret
|
|---|
| 1723 | DriveIO_IsValidHarddisk EndP
|
|---|
| 1724 |
|
|---|
| 1725 |
|
|---|
| 1726 | ; Values for sectors per track table corresponding to DriveIO_IsHugeDrive return value.
|
|---|
| 1727 | secs_per_track_table db 63,127,255,255,255,255
|
|---|
| 1728 |
|
|---|
| 1729 | ;~ db_lmlvm db 'Load Master LVM -- disk: ',0
|
|---|
