| 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 | jc PCCF13E_NotFound ; Error occured
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| 38 | cmp bx, 0AA55h
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| 39 | je PCCF13E_Found
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| 40 | PCCF13E_NotFound:
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| 41 | ret
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| 42 | PCCF13E_Found:
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| 43 | and cx, 1 ; Check 42h-44h,47h,48h supported
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| 44 | jz PCCF13E_NotFound ; Sig OK but no support, strange beast
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| 45 | mov byte ptr [CurIO_UseExtension], 1
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| 46 | ret
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| 47 | DriveIO_CheckFor13extensions EndP
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| 48 |
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| 49 |
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| 50 | ; Note: Some routines set DS/ES to CS or even address via CS, even if its not
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| 51 | ; needed. This was done for SECURITY. So DO NOT remove it.
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| 52 | ; Its there to make sure the correct data is loaded/written to/from
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| 53 | ; harddrive.
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| 54 | ;
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| 55 | ; IF YOU MODIFY ANYTHING IN HERE, YOU MAY EASILY BREAK YOUR HARDDRIVE!
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| 56 |
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| 57 | ; Will only load base-configuration, will NOT load IPT nor Hide-Config
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| 58 | ; Those are originally loaded on startup and will NOT get reloaded.
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| 59 | DriveIO_LoadConfiguration Proc Near Uses ax bx cx dx es
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| 60 | mov ax, cs
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| 61 | mov es, ax
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| 62 | mov bx, offset Configuration
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| 63 | xor dh, dh
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| 64 | mov dl, [BIOS_BootDisk] ; Disk we booted from
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| 65 | mov cx, 0037h ; Sector 55 (CHS)
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| 66 | mov ax, 0201h ; Function 02, read 1 sector...
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| 67 | int 13h
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| 68 | jnc DIOLC_NoError
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| 69 | call MBR_LoadError ; Will Abort BootUp
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| 70 | DIOLC_NoError:
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| 71 | ret
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| 72 | DriveIO_LoadConfiguration EndP
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| 73 |
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| 74 | DriveIO_SaveConfiguration Proc Near Uses ax bx cx dx ds es si
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| 75 | mov ax, cs
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| 76 | mov ds, ax
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| 77 | mov es, ax ; Safety first (CS==DS==ES)
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| 78 | ; --- Overwrite Floppy-Name with "FloppyDrive"
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| 79 | mov si, offset TXT_Floppy_Drive
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| 80 | mov di, offset PartitionTable
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| 81 | sub di, 30 ; Adjust to Floppy-Name
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| 82 | mov cx, 11
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| 83 | rep movsb
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| 84 | mov si, offset Configuration ; Calculate new checksum
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| 85 | xor bx, bx
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| 86 |
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| 87 | ; Changed from 5 to calculated value (not here, see compat. issue below)
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| 88 | ; Fixes issue: #2987 -- "air-boot doesn't remember drive letter"
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| 89 | ; Size of the ab-configuration in 512 byte sectors
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| 90 | ;mov cx, (MBR_BackUpMBR - Configuration) / 200h
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| 91 |
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| 92 | ; AB v1.07 stores a 5 sector configuration with a 5 sector checksum.
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| 93 | ; AB v1.0.8+ *should* stores a 7 sector configuration with a
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| 94 | ; 7 sector checksum.
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| 95 | ; Because 5 was hardcoded here, SET(A)BOOT v1.07 will see see an AB v1.0.8+
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| 96 | ; config as corrupted, while this is not the case.
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| 97 | ; So, for compatibility reasons, in v1.0.8+, the checksum stored is over
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| 98 | ; 5 sectors, to be compatible with v1.07.
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| 99 | ; This may change (be corrected) in future versions !
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| 100 | mov cx,5
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| 101 |
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| 102 | mov dx, [CFG_CheckConfig]
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| 103 | mov [CFG_CheckConfig], bx
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| 104 | DIOSC_Loop:
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| 105 | call MBR_GetCheckOfSector
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| 106 | loop DIOSC_Loop
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| 107 | mov [CFG_CheckConfig], bx
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| 108 | ; --------------------------------------------------------------------
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| 109 | ; ES == CS
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| 110 | mov bx, offset Configuration
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| 111 | xor dh, dh
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| 112 | mov dl, [BIOS_BootDisk] ; Disk we booted from
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| 113 | mov cx, 0037h ; Sector 55 (CHS)
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| 114 |
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| 115 | ; Changed from 5 to calculated value
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| 116 | ; Fixes issue: #2987 -- "air-boot doesn't remember drive letter"
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| 117 | ; Size of the ab-configuration in 512 byte sectors
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| 118 | mov al, (MBR_BackUpMBR - Configuration) / 200h
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| 119 | mov ah,03h
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| 120 |
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| 121 | int 13h
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| 122 | jnc DIOSC_NoError
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| 123 | call MBR_SaveError ; Will Abort BootUp
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| 124 | DIOSC_NoError:
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| 125 | ret
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| 126 | DriveIO_SaveConfiguration EndP
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| 127 |
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| 128 | DriveIO_UpdateFloppyName Proc Near Uses bx cx dx ds si es di
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| 129 | mov ax, cs
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| 130 | mov ds, ax
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| 131 | mov es, ax
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| 132 |
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| 133 | mov ah, 00h ; Function 0 - Reset Drive
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| 134 | xor dl, dl
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| 135 | int 13h
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| 136 | xor dx, dx ; Cylinder=0, Head=0
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| 137 | mov cx, 1 ; Sector=1, Drive=0
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| 138 | mov bx, offset TmpSector ; ES:BX - TmpSector
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| 139 | mov ax, 0201h ; Function 2 - Load Sector
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| 140 | int 13h
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| 141 | jnc DIOUFN_AllFine
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| 142 |
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| 143 | ; --- Overwrite Floppy-Name with "No Disc"
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| 144 | mov si, offset TXT_Floppy_NoDisc
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| 145 | xor ax, ax
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| 146 | DIOUFN_WriteFloppyName:
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| 147 | mov di, offset PartitionTable
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| 148 | sub di, 30 ; Adjust to Floppy-Name
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| 149 | mov cl, 11
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| 150 | rep movsb
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| 151 | ret ; AX=-1 -> GotDisc, =0 -> NoDisc
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| 152 |
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| 153 | ; --- Floppy found and read, data in TempSector
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| 154 | DIOUFN_AllFine:
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| 155 | mov ax, -1
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| 156 | mov si, offset TXT_Floppy_NoName
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| 157 | cmp wptr es:[bx+54], 'AF'
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| 158 | jne DIOUFN_WriteFloppyName
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| 159 | cmp wptr es:[bx+56], '1T'
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| 160 | jne DIOUFN_WriteFloppyName
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| 161 | cmp bptr es:[bx+58], '2'
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| 162 | jne DIOUFN_WriteFloppyName
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| 163 | mov si, bx
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| 164 | add si, 43 ; FAT12 - Volume Label Location
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| 165 | jmp DIOUFN_WriteFloppyName
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| 166 | DriveIO_UpdateFloppyName EndP
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| 167 |
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| 168 | ; =============================================================================
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| 169 | ; HARDDRIVE / GENERAL ACCESS
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| 170 | ; =============================================================================
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| 171 | ; The following routines are used for harddisc/floppy access.
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| 172 | ; The access is done via INT 13h/CHS or INT 13h/LBA.
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| 173 | ; Access will be done prefered by INT 13h/CHS, because it's (I wonder!) much
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| 174 | ; faster, than the LBA-method. I don't know, why LBA is so slow. Perhaps BIOS.
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| 175 | ;
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| 176 | ; Internal access (to AiR-BOOT) is always done via INT 13h/CHS.
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| 177 |
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| 178 | DriveIO_GetHardDriveCount Proc Near Uses ds si
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| 179 | push ds
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| 180 | push si
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| 181 | push 0040h
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| 182 | pop ds
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| 183 | mov si, 0075h
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| 184 | mov dh, ds:[si] ; 40:75 -> POST: Total Harddiscs == DL
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| 185 | pop si
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| 186 | pop ds
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| 187 | mov [TotalHarddiscs], dh
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| 188 | ret
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| 189 | DriveIO_GetHardDriveCount EndP
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| 190 |
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| 191 |
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| 192 | ; Fills our LBA-Usage table. It holds the LBA-address, where BIOS/CHS access is
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| 193 | ; stopped and BIOS/LBA access is started.
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| 194 | ; This is calculated by Sector*Heads. Comparing will get done with Bit 25-10
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| 195 | ; on LBA sectors, so we actually divide sector number by 1024.
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| 196 | DriveIO_InitLBASwitchTable Proc Near Uses es di
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| 197 | mov di, offset LBASwitchTable
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| 198 | mov dh, [TotalHarddiscs]
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| 199 | mov dl, 80h ; First disk to process
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| 200 | DIOILUT_DriveLoop:
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| 201 | push dx
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| 202 | push di
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| 203 | mov ah, 08h
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| 204 | int 13h ; DISK - GET DRIVE PARAMETERS
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| 205 | mov ah, 0FBh ; Assume 255 heads/63 sectors, if error
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| 206 | jc DIOILUT_Error
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| 207 | and cl, 111111b ; Isolate lower 6 bits of CL -> sector count
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| 208 |
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| 209 | ;movzx ax, cl
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| 210 | mov al,cl
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| 211 | mov ah,0
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| 212 |
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| 213 | mov bl, dh ; DH -> max head number
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| 214 | mul bl ; AX = Sectors*Heads
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| 215 | shl ah, 1
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| 216 | shl ah, 1 ; Shift 2 bits, so we are able to compare to
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| 217 | ; bit 16-23 of the LBA address
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| 218 | DIOILUT_Error:
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| 219 | pop di
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| 220 | pop dx
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| 221 | mov bptr ds:[di], ah ; Save that value
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| 222 | inc di ; Go to next BYTE
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| 223 | inc dl ; Next disk
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| 224 | dec dh ; Decrease disks to process
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| 225 | jnz DIOILUT_DriveLoop ; Next disk if DH != 0
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| 226 | ret
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| 227 | DriveIO_InitLBASwitchTable EndP
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| 228 |
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| 229 |
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| 230 |
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| 231 |
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| 232 | ;FIXME: Only LBA gets updated, need to update CHS too !!!!!!!
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| 233 |
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| 234 | ; Adjusts BX:AX / CX:DX to meet LVM sector location
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| 235 | ; BX:AX / CX:DX point to MBR or EBR !
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| 236 | ; Destroys SI
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| 237 | ; Rousseau: Enhanced to handle sector-numbers 127 and 255 besides 63 for LVM-info sectors.
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| 238 | ; Ugly, need to cleanup.
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| 239 | DriveIO_LVMAdjustToInfoSector Proc Near
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| 240 | push cx ; Save Cyl/Sec part
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| 241 | xor ch,ch ; Clear low Cyl part
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| 242 | and cl,63 ; Clear high Cyl part
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| 243 | push bx ; We need BX...
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| 244 | push dx ; and DX temoraily
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| 245 | mov bx,offset [TrueSecs] ; Offset of sector table
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| 246 | xor dh,dh ; Clear DH because we use DL as index
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| 247 | and dl,01111111b ; Remove high bit of BIOS disk-nr
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| 248 | shl dx,2 ; Index to DWORD table
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| 249 | add bx,dx ; Point to TrueSecs for this disk
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| 250 | mov si,[bx] ; Get SPT for this disk
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| 251 | pop dx ; Restore DX...
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| 252 | pop bx ; and BX
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| 253 | ;~ sub si,cx ; Adjust offset !! INCORRECT FOR LBA (TP CX != 0 !!)
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| 254 | dec si
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| 255 | pop cx ; Restore Cyl/Sec part
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| 256 | add ax,si ; Add offset to low part...
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| 257 | adc bx,0 ; and high part of LBA address
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| 258 | or cl,63 ; Adjust CHS part !FIX ME for > 63! !! FIX HUGE DRIVE !!
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| 259 |
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| 260 |
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| 261 | ret
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| 262 |
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| 263 | DriveIO_LVMAdjustToInfoSector EndP
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| 264 |
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| 265 |
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| 266 |
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| 267 |
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| 268 |
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| 269 |
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| 270 | ; #########################################################################
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| 271 | ; Routine: Loads partition to ExecBase and checks for validity
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| 272 | ; #########################################################################
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| 273 | ; Calling : bx:ax - Absolute sector
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| 274 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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| 275 | ; Returns : Carry Set if invalid partition encountered
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| 276 | ; Preserve: all registers
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| 277 | ; #########################################################################
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| 278 | DriveIO_LoadPartition Proc Near Uses si
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| 279 | mov wptr cs:[CurPartition_Location+0], ax
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| 280 | mov wptr cs:[CurPartition_Location+2], bx
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| 281 | mov wptr cs:[CurPartition_Location+4], dx
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| 282 | mov wptr cs:[CurPartition_Location+6], cx ; Saves the location
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| 283 | mov si, offset PartitionSector ; DS:SI - ExecBase
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| 284 | call DriveIO_LoadSector
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| 285 | clc
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| 286 | cmp wptr [si+LocBR_Magic], 0AA55h
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| 287 | je DIOLP_Success
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| 288 | ; We check, if we are scanning partitions. In that case, if CHS is not 0/0/1
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| 289 | ; we will display a "bad partition table" message and halt the system.
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| 290 | cmp cx, 0001h
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| 291 | jne DIOLP_Failed
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| 292 | or dh, dh
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| 293 | jnz DIOLP_Failed
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| 294 | stc ; Set carry, so no partition table
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| 295 | DIOLP_Success:
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| 296 |
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| 297 | IFDEF AUX_DEBUG
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| 298 | ; show current partition location
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| 299 | ;~ pushf
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| 300 | ;~ pusha
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| 301 | ;~ call AuxIO_TeletypeNL
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| 302 | ;~ mov si,offset db_curpartloc
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| 303 | ;~ call AuxIO_Print
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| 304 | ;~ mov dx,word ptr [CurPartition_Location+02]
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| 305 | ;~ mov ax,word ptr [CurPartition_Location+00]
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| 306 | ;~ call AuxIO_TeletypeHexDWord
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| 307 | ;~ call AuxIO_TeletypeNL
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| 308 | ;~ mov si,offset PartitionSector
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| 309 | ;~ call AuxIO_DumpSector
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| 310 | ;~ call AuxIO_TeletypeNL
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| 311 | ;~ popa
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| 312 | ;~ popf
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| 313 | ENDIF
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| 314 |
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| 315 | ret
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| 316 | DIOLP_Failed:
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| 317 | jmp DriveIO_GotLoadError
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| 318 | DriveIO_LoadPartition EndP
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| 319 |
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| 320 | ; #########################################################################
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| 321 | ; Routine: Writes a partition from ExecBase to its original sector
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| 322 | ; #########################################################################
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| 323 | ; Calling : none
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| 324 | ; Returns : none
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| 325 | ; Preserve: all registers
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| 326 | ; #########################################################################
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| 327 | DriveIO_SavePartition Proc Near Uses ax bx cx dx si
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| 328 | mov ax, wptr cs:[CurPartition_Location+0]
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| 329 | mov bx, wptr cs:[CurPartition_Location+2]
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| 330 | mov dx, wptr cs:[CurPartition_Location+4]
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| 331 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets prev. saved location
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| 332 | mov si, offset PartitionSector ; DS:SI - ExecBase
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| 333 | cmp wptr [si+LocBR_Magic], 0AA55h ; Checks for signature, if not found
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| 334 | jne DIOSP_SevereError ; we assume a really bad error
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| 335 | call DriveIO_SaveSector
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| 336 | DIOSP_SevereError:
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| 337 | ret
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| 338 | DriveIO_SavePartition EndP
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| 339 |
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| 340 | ; Keeps DS:SI for caller
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| 341 | DriveIO_LoadTmpSector Proc Near
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| 342 | mov si, offset TmpSector
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| 343 | call DriveIO_LoadSector
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| 344 | ret
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| 345 | DriveIO_LoadTmpSector EndP
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| 346 |
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| 347 | ; Keeps DS:SI for caller
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| 348 | DriveIO_SaveTmpSector Proc Near
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| 349 | mov si, offset TmpSector
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| 350 | call DriveIO_SaveSector
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| 351 | ret
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| 352 | DriveIO_SaveTmpSector EndP
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| 353 |
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| 354 |
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| 355 |
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| 356 | ; Keeps DS:SI for caller, sets carry if valid LVM sector encountered
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| 357 | DriveIO_LoadLVMSector Proc Near Uses ax bx cx dx
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| 358 | test byte ptr [CFG_IgnoreLVM], 1 ; We are supposed to ignore LVM, so
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| 359 | jnz DIOLLVMS_NoLVMSector ; don't load but declare as bad!
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| 360 | mov ax, wptr cs:[CurPartition_Location+0]
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| 361 | mov bx, wptr cs:[CurPartition_Location+2]
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| 362 | mov dx, wptr cs:[CurPartition_Location+4]
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| 363 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets cur. partition location
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| 364 |
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| 365 | call DriveIO_LVMAdjustToInfoSector
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| 366 |
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| 367 | mov si, offset LVMSector
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| 368 | call DriveIO_LoadSector
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| 369 |
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| 370 | IFDEF AUX_DEBUG
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| 371 | ; show current partition location
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| 372 | ;~ pushf
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| 373 | ;~ pusha
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| 374 | ;~ call AuxIO_TeletypeNL
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| 375 | ;~ mov si,offset db_curlvmsec
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| 376 | ;~ call AuxIO_Print
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| 377 | ;~ mov dx,bx
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| 378 | ;~ call AuxIO_TeletypeHexDWord
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| 379 | ;~ call AuxIO_TeletypeNL
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| 380 | ;~ mov si,offset LVMSector
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| 381 | ;~ call AuxIO_DumpSector
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| 382 | ;~ call AuxIO_TeletypeNL
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| 383 | ;~ popa
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| 384 | ;~ popf
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| 385 | ENDIF
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| 386 |
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| 387 | call LVM_CheckSectorSignature
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| 388 | jnc DIOLLVMS_NoLVMSector
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| 389 | call LVM_CheckSectorCRC
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| 390 | jnc DIOLLVMS_NoLVMSector
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| 391 | ret
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| 392 | ; This here is called, if an invalid (or no) LVM information sector is found
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| 393 | ; It will truncate the first byte of the sector, so all other routines
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| 394 | ; will notice it easily by just comparing the first byte.
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| 395 | DIOLLVMS_NoLVMSector:
|
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| 396 | mov bptr [si+LocLVM_SignatureStart], 0
|
|---|
| 397 | ret
|
|---|
| 398 | DriveIO_LoadLVMSector EndP
|
|---|
| 399 |
|
|---|
| 400 |
|
|---|
| 401 |
|
|---|
| 402 | ; Keeps DS:SI for caller, saves at anytime w/o checks (!)
|
|---|
| 403 | DriveIO_SaveLVMSector Proc Near Uses ax bx cx dx
|
|---|
| 404 | test byte ptr [CFG_IgnoreLVM], 1 ; We are supposed to ignore LVM, so
|
|---|
| 405 | jnz DIOSLVMS_SevereError ; don't save at anytime (security!)
|
|---|
| 406 | mov ax, wptr cs:[CurPartition_Location+0]
|
|---|
| 407 | mov bx, wptr cs:[CurPartition_Location+2]
|
|---|
| 408 | mov dx, wptr cs:[CurPartition_Location+4]
|
|---|
| 409 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets cur. partition location
|
|---|
| 410 | call LVM_CheckSectorSignature
|
|---|
| 411 | jnc DIOSLVMS_SevereError ; LVM Signature must be there
|
|---|
| 412 |
|
|---|
| 413 | IFDEF AUX_DEBUG
|
|---|
| 414 | ;~ dioatlvm db 'DriveIO_LVMAdjustToInfoSector',10,0
|
|---|
| 415 | ;~ pushf
|
|---|
| 416 | ;~ pusha
|
|---|
| 417 | ;~ mov si,offset dioatlvm
|
|---|
| 418 | ;~ call AuxIO_Print
|
|---|
| 419 | ;~ popa
|
|---|
| 420 | ;~ popf
|
|---|
| 421 | call DEBUG_DumpRegisters
|
|---|
| 422 | call DEBUG_DumpCHS
|
|---|
| 423 | ENDIF
|
|---|
| 424 |
|
|---|
| 425 | call DriveIO_LVMAdjustToInfoSector
|
|---|
| 426 |
|
|---|
| 427 | IFDEF AUX_DEBUG
|
|---|
| 428 | call DEBUG_DumpRegisters
|
|---|
| 429 | call DEBUG_DumpCHS
|
|---|
| 430 | ENDIF
|
|---|
| 431 |
|
|---|
| 432 | mov si, offset LVMSector
|
|---|
| 433 | call DriveIO_SaveSector
|
|---|
| 434 | DIOSLVMS_SevereError:
|
|---|
| 435 | ret
|
|---|
| 436 | DriveIO_SaveLVMSector EndP
|
|---|
| 437 |
|
|---|
| 438 | ; Rousseau: Move this to BSS and merge with int13xbuf there.
|
|---|
| 439 |
|
|---|
| 440 | ; Memory-Block that holds information for LBA-access via INT 13h
|
|---|
| 441 | DriveIO_DAP db 10h ; Size of paket
|
|---|
| 442 | db 0 ; Reserved
|
|---|
| 443 | DriveIO_DAP_NumBlocks dw 0 ; Number of blocks
|
|---|
| 444 | DriveIO_DAP_Transfer dd 0 ; Transfer Adress
|
|---|
| 445 | DriveIO_DAP_Absolute dd 0 ; Absolute Sector
|
|---|
| 446 | dd 0 ; Second Part of QWORD
|
|---|
| 447 |
|
|---|
| 448 | ; Special error message instead of "LOAD ERROR" during partition scanning,
|
|---|
| 449 | ; so users will notice that something is bad with their partition table(s)
|
|---|
| 450 | DriveIO_GotLoadError Proc Near
|
|---|
| 451 | test byte ptr cs:[CurIO_Scanning], 1 ; Must be CS:, cause DS!=CS maybe here
|
|---|
| 452 | jnz InScanMode
|
|---|
| 453 | jmp MBR_LoadError
|
|---|
| 454 | InScanMode:
|
|---|
| 455 | mov si, offset TXT_BrokenPartitionTable
|
|---|
| 456 | push cs
|
|---|
| 457 | pop ds
|
|---|
| 458 | call MBR_Teletype
|
|---|
| 459 | mov si, offset BrokenHDD
|
|---|
| 460 | sub dl, 50h ; 80h -> '0'
|
|---|
| 461 | cmp dl, 39h
|
|---|
| 462 | jbe DIOGLE_BelowA
|
|---|
| 463 | add dl, 7 ; 3Ah -> 'A'
|
|---|
| 464 | DIOGLE_BelowA:
|
|---|
| 465 | mov bptr [si+5], dl
|
|---|
| 466 | call MBR_Teletype
|
|---|
| 467 |
|
|---|
| 468 | ; JWasm: cannot jump to local label in other procedure.
|
|---|
| 469 | ; Changed to halt here.
|
|---|
| 470 | ;jmp MBRLE_Halt
|
|---|
| 471 | DriveIO_GotLoadError_halt:
|
|---|
| 472 | jmp DriveIO_GotLoadError_halt
|
|---|
| 473 | DriveIO_GotLoadError EndP
|
|---|
| 474 |
|
|---|
| 475 | ; #########################################################################
|
|---|
| 476 | ; Routine: Loads a specified sector to DS:DI
|
|---|
| 477 | ; #########################################################################
|
|---|
| 478 | ; Calling : bx:ax - Absolute sector
|
|---|
| 479 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 480 | ; ds:si - Destination-Adress
|
|---|
| 481 | ; Returns : none
|
|---|
| 482 | ; Preserve: all registers
|
|---|
| 483 | ; #########################################################################
|
|---|
| 484 | DriveIO_LoadSector Proc Near Uses ax bx cx dx ds si es di
|
|---|
| 485 | ; Is the drive not a harddrive?
|
|---|
| 486 | cmp dl, 80h
|
|---|
| 487 | jb DIOLS_UseNormal
|
|---|
| 488 |
|
|---|
| 489 | test byte ptr cs:[CurIO_UseExtension], 1
|
|---|
| 490 | jz DIOLS_UseNormal
|
|---|
| 491 | ; Are we forced do use LBA via Setting?
|
|---|
| 492 | jnz DIOLS_UseExtension
|
|---|
| 493 |
|
|---|
| 494 | ; Upper 8 bits of LBA-address set?
|
|---|
| 495 | ; Then use LBA (maximum boundary is 16320x16x63 = FB0400h)
|
|---|
| 496 | or bh, bh
|
|---|
| 497 | jnz DIOLS_UseExtension
|
|---|
| 498 | ; Compare Switch-Table value to bit 16-23 of LBA-address
|
|---|
| 499 | mov di, dx
|
|---|
| 500 | and di, 007Fh
|
|---|
| 501 | cmp bptr cs:[LBASwitchTable+di], bl
|
|---|
| 502 | jbe DIOLS_UseExtension
|
|---|
| 503 | DIOLS_UseNormal:
|
|---|
| 504 | mov di, 3
|
|---|
| 505 | DIOLS_ErrorLoop:
|
|---|
| 506 | push ds
|
|---|
| 507 | pop es
|
|---|
| 508 | mov bx, si ; ES:BX - Destination
|
|---|
| 509 | mov ax, 0201h ; Function 2 - Load Sector
|
|---|
| 510 | int 13h
|
|---|
| 511 | jnc DIOLS_Success
|
|---|
| 512 | dec di
|
|---|
| 513 | jnz DIOLS_ErrorLoop
|
|---|
| 514 | ; Sector load failed...
|
|---|
| 515 | jmp DriveIO_GotLoadError
|
|---|
| 516 |
|
|---|
| 517 | DIOLS_UseExtension:
|
|---|
| 518 | push cx
|
|---|
| 519 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
|
|---|
| 520 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
|
|---|
| 521 | mov cx, ds
|
|---|
| 522 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
|
|---|
| 523 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
|
|---|
| 524 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
|
|---|
| 525 | push cs
|
|---|
| 526 | pop ds
|
|---|
| 527 | mov si, offset DriveIO_DAP
|
|---|
| 528 | mov ah, 42h ; Extended Read
|
|---|
| 529 | int 13h
|
|---|
| 530 | pop cx
|
|---|
| 531 | jnc DIOLS_Success
|
|---|
| 532 | ; Sector load failed...
|
|---|
| 533 | jmp DriveIO_GotLoadError
|
|---|
| 534 |
|
|---|
| 535 | DIOLS_Success:
|
|---|
| 536 | ret
|
|---|
| 537 | DriveIO_LoadSector EndP
|
|---|
| 538 |
|
|---|
| 539 |
|
|---|
| 540 |
|
|---|
| 541 | ;##############################################################################
|
|---|
| 542 | ;# ACTION : Reads a sector from disk using INT13 extensions
|
|---|
| 543 | ;# ----------------------------------------------------------------------------
|
|---|
| 544 | ;# IN : BX:CX - LBA address of sector
|
|---|
| 545 | ;# : DI:SI - SEG:OFF of transfer buffer
|
|---|
| 546 | ;# ----------------------------------------------------------------------------
|
|---|
| 547 | ;# OUT : CF=1 - failure, AH failure code
|
|---|
| 548 | ;# ----------------------------------------------------------------------------
|
|---|
| 549 | ;# EFFECTS : Modifies DAP structure and fills transfer buffer
|
|---|
| 550 | ;##############################################################################
|
|---|
| 551 | DriveIO_ReadSectorLBA Proc Near Uses bx cx dx si di ds es
|
|---|
| 552 |
|
|---|
| 553 | ; One sector to read
|
|---|
| 554 | mov cs:[DriveIO_DAP_NumBlocks], 1
|
|---|
| 555 |
|
|---|
| 556 | ; Setup transfer address
|
|---|
| 557 | mov wptr cs:[DriveIO_DAP_Transfer+0], si ; offset
|
|---|
| 558 | mov wptr cs:[DriveIO_DAP_Transfer+2], di ; segment
|
|---|
| 559 |
|
|---|
| 560 | ; Setup LBA64 address of requested sector
|
|---|
| 561 | mov wptr cs:[DriveIO_DAP_Absolute+0], cx ; low word lower part
|
|---|
| 562 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; high word lower part
|
|---|
| 563 | mov wptr cs:[DriveIO_DAP_Absolute+4], 0 ; low word upper part
|
|---|
| 564 | mov wptr cs:[DriveIO_DAP_Absolute+6], 0 ; high word upper part
|
|---|
| 565 |
|
|---|
| 566 | ; Address of packet
|
|---|
| 567 | mov si, offset [DriveIO_DAP] ; disk address packet
|
|---|
| 568 |
|
|---|
| 569 | ; Do the extended read
|
|---|
| 570 | mov ah, 42h ; read function
|
|---|
| 571 | int 13h ; transfer to bios
|
|---|
| 572 |
|
|---|
| 573 | ; Error occured
|
|---|
| 574 | jc DriveIO_ReadSectorLBA_exit
|
|---|
| 575 |
|
|---|
| 576 | ; AH should also be zero
|
|---|
| 577 | test ah, ah
|
|---|
| 578 | stc
|
|---|
| 579 | jnz DriveIO_ReadSectorLBA_exit
|
|---|
| 580 |
|
|---|
| 581 | ; Disk read succeeded, clear CF
|
|---|
| 582 | clc
|
|---|
| 583 |
|
|---|
| 584 | DriveIO_ReadSectorLBA_exit:
|
|---|
| 585 | ret
|
|---|
| 586 |
|
|---|
| 587 | DriveIO_ReadSectorLBA EndP
|
|---|
| 588 |
|
|---|
| 589 |
|
|---|
| 590 |
|
|---|
| 591 | ;##############################################################################
|
|---|
| 592 | ;# ACTION : Writes a sector to disk using INT13 extensions
|
|---|
| 593 | ;# ----------------------------------------------------------------------------
|
|---|
| 594 | ;# IN : AL - write flags, AL.0 verify (1.0,2.0), AL.1 verify (2.1+)
|
|---|
| 595 | ;# : BX:CX - LBA address of sector
|
|---|
| 596 | ;# : DI:SI - SEG:OFF of transfer buffer
|
|---|
| 597 | ;# ----------------------------------------------------------------------------
|
|---|
| 598 | ;# OUT : CF=1 - failure, AH failure code
|
|---|
| 599 | ;# ----------------------------------------------------------------------------
|
|---|
| 600 | ;# EFFECTS : Modifies DAP structure and mofifies the disk
|
|---|
| 601 | ;##############################################################################
|
|---|
| 602 | DriveIO_WriteSectorLBA Proc Near Uses bx cx dx si di ds es
|
|---|
| 603 |
|
|---|
| 604 | ; Mask reserved bits for wrte flags -- should check version here
|
|---|
| 605 | and al, 03h
|
|---|
| 606 |
|
|---|
| 607 | ; One sector to read
|
|---|
| 608 | mov cs:[DriveIO_DAP_NumBlocks], 1
|
|---|
| 609 |
|
|---|
| 610 | ; Setup transfer address
|
|---|
| 611 | mov wptr cs:[DriveIO_DAP_Transfer+0], si ; offset
|
|---|
| 612 | mov wptr cs:[DriveIO_DAP_Transfer+2], di ; segment
|
|---|
| 613 |
|
|---|
| 614 | ; Setup LBA64 address of requested sector
|
|---|
| 615 | mov wptr cs:[DriveIO_DAP_Absolute+0], cx ; low word lower part
|
|---|
| 616 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; high word lower part
|
|---|
| 617 | mov wptr cs:[DriveIO_DAP_Absolute+4], 0 ; low word upper part
|
|---|
| 618 | mov wptr cs:[DriveIO_DAP_Absolute+6], 0 ; high word upper part
|
|---|
| 619 |
|
|---|
| 620 | ; Address of packet
|
|---|
| 621 | mov si, offset [DriveIO_DAP] ; disk address packet
|
|---|
| 622 |
|
|---|
| 623 | ; Do the extended write
|
|---|
| 624 | mov ah, 43h ; write function
|
|---|
| 625 | int 13h ; transfer to bios
|
|---|
| 626 |
|
|---|
| 627 | ; Error occured
|
|---|
| 628 | jc DriveIO_WriteSectorLBA_exit
|
|---|
| 629 |
|
|---|
| 630 | ; AH should also be zero
|
|---|
| 631 | test ah, ah
|
|---|
| 632 | stc
|
|---|
| 633 | jnz DriveIO_WriteSectorLBA_exit
|
|---|
| 634 |
|
|---|
| 635 | ; Disk write succeeded, clear CF
|
|---|
| 636 | clc
|
|---|
| 637 |
|
|---|
| 638 | DriveIO_WriteSectorLBA_exit:
|
|---|
| 639 | ret
|
|---|
| 640 |
|
|---|
| 641 | DriveIO_WriteSectorLBA EndP
|
|---|
| 642 |
|
|---|
| 643 |
|
|---|
| 644 |
|
|---|
| 645 | ;
|
|---|
| 646 | ; ############################################################
|
|---|
| 647 | ; # Check for a valid MBR-sector to be written to disk #
|
|---|
| 648 | ; ############################################################
|
|---|
| 649 | ;
|
|---|
| 650 | ; In
|
|---|
| 651 | ; --
|
|---|
| 652 | ; DL = Physical Disk
|
|---|
| 653 | ; BX:CX = LBA sector
|
|---|
| 654 | ; DI:SI = Source buffer
|
|---|
| 655 | ;
|
|---|
| 656 | ; Out
|
|---|
| 657 | ; ---
|
|---|
| 658 | ; CY = 1 if invalid MBR in source buffer, 0 if valid
|
|---|
| 659 | ;
|
|---|
| 660 | ; This routine is called when DriveIO_SaveSector attempts to write to the MBR.
|
|---|
| 661 | ; It checks if the sector to be written has some sensible values in certain
|
|---|
| 662 | ; places. In fact, if the sector is written to the boot-disk, the AiR-BOOT
|
|---|
| 663 | ; signature should be present and the partition table should be the same
|
|---|
| 664 | ; as the one at the start of the AiR-BOOT code in memory, except maybe for the
|
|---|
| 665 | ; active flags.
|
|---|
| 666 | ; For other disks, only the active flags are checked to be 00h or 80h and
|
|---|
| 667 | ; the AA55h MBR signature.
|
|---|
| 668 | ;
|
|---|
| 669 | DriveIO_ProtectMBR Proc Near
|
|---|
| 670 | pusha ; Push all registers
|
|---|
| 671 | push es ; Push ES because we need it for string instructions
|
|---|
| 672 | push cs ; Make ES point...
|
|---|
| 673 | pop es ; to CS
|
|---|
| 674 |
|
|---|
| 675 | ; Save the pointer to the sector to write in BX
|
|---|
| 676 | mov bx,si
|
|---|
| 677 |
|
|---|
| 678 | ;
|
|---|
| 679 | ; If the sector to be written is not the boot-disk, then skip
|
|---|
| 680 | ; checking the AiR-BOOT MBR.
|
|---|
| 681 | ;
|
|---|
| 682 | cmp dl, [BIOS_BootDisk]
|
|---|
| 683 | jne DriveIO_ProtectMBR_is_not_bootdisk
|
|---|
| 684 |
|
|---|
| 685 | ;
|
|---|
| 686 | ; The boot-disk is accessed so the sector to be written must be
|
|---|
| 687 | ; the AiR-BOOT MBR. This is the same as the first 512 bytes
|
|---|
| 688 | ; relocated to 8000:0000 and this the start of the AB-code.
|
|---|
| 689 | ;
|
|---|
| 690 | mov si,bx ; Get pointer to sector to write
|
|---|
| 691 | xor di,di ; Point DI to start of AB-code (MBR)
|
|---|
| 692 | mov cx, offset [MBR_PartTable] ; Bytes upto P-table must be same
|
|---|
| 693 | cld ; Compare upwards
|
|---|
| 694 | repe cmpsb ; Compare upto P-table
|
|---|
| 695 |
|
|---|
| 696 | ; If not the same this is not the an AiR-BOOT boot-disk MBR !
|
|---|
| 697 | jne DriveIO_ProtectMBR_not_valid_MBR ; SEVERE ERROR !
|
|---|
| 698 |
|
|---|
| 699 | ; Continue with signature check
|
|---|
| 700 | jmp DriveIO_ProtectMBR_check_signature
|
|---|
| 701 |
|
|---|
| 702 |
|
|---|
| 703 | ;
|
|---|
| 704 | ; The disk is not the boot-disk so we don't know what kind of MBR is on it.
|
|---|
| 705 | ; Some sanity checks should be here.
|
|---|
| 706 | ;
|
|---|
| 707 | DriveIO_ProtectMBR_is_not_bootdisk:
|
|---|
| 708 |
|
|---|
| 709 | ;
|
|---|
| 710 | ; sanity checks...
|
|---|
| 711 | ;
|
|---|
| 712 |
|
|---|
| 713 | ; Continue with signature check
|
|---|
| 714 | jmp DriveIO_ProtectMBR_check_signature
|
|---|
| 715 |
|
|---|
| 716 |
|
|---|
| 717 | DriveIO_ProtectMBR_check_signature:
|
|---|
| 718 | ; See if the sector to write contains a valid signature
|
|---|
| 719 | mov si,bx ; Get pointer to sector to write
|
|---|
| 720 | mov di, offset [MBR_Sig] ; Offset to MBR signature
|
|---|
| 721 | add si,di ; Make SI point to it in sec to write
|
|---|
| 722 | lodsw ; Load it
|
|---|
| 723 | cmp ax,0aa55h ; See if it is valid
|
|---|
| 724 |
|
|---|
| 725 | ; If no signature this cannot be a valid MBR !
|
|---|
| 726 | jne DriveIO_ProtectMBR_not_valid_MBR ; SEVERE ERROR !
|
|---|
| 727 |
|
|---|
| 728 |
|
|---|
| 729 | ;
|
|---|
| 730 | ; The sector to be written seems to be valid.
|
|---|
| 731 | ; Set CY=0 to indicate a valid MBR.
|
|---|
| 732 | ;
|
|---|
| 733 | DriveIO_ProtectMBR_is_valid_MBR:
|
|---|
| 734 | clc
|
|---|
| 735 | jmp DriveIO_ProtectMBR_end
|
|---|
| 736 |
|
|---|
| 737 | ;
|
|---|
| 738 | ; Something is terribly wrong; a non-MBR sector seems about to be written.
|
|---|
| 739 | ; Set CY=1 and let the calling code handle this situation.
|
|---|
| 740 | ;
|
|---|
| 741 | DriveIO_ProtectMBR_not_valid_MBR:
|
|---|
| 742 | stc
|
|---|
| 743 | jmp DriveIO_ProtectMBR_end
|
|---|
| 744 |
|
|---|
| 745 | ;
|
|---|
| 746 | ; Return to the caller with no registers modyfied except FLAGS.
|
|---|
| 747 | ;
|
|---|
| 748 | DriveIO_ProtectMBR_end:
|
|---|
| 749 | pop es
|
|---|
| 750 | popa
|
|---|
| 751 | ret
|
|---|
| 752 | DriveIO_ProtectMBR Endp
|
|---|
| 753 |
|
|---|
| 754 |
|
|---|
| 755 |
|
|---|
| 756 | ; #########################################################################
|
|---|
| 757 | ; Routine: Checks if the MBR is addressed by either CHS or LBA
|
|---|
| 758 | ; #########################################################################
|
|---|
| 759 | ; Calling : bx:ax - Absolute sector
|
|---|
| 760 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 761 | ; Returns : ZF=1 if MBR is addressed, else ZF=0
|
|---|
| 762 | ; Preserve: all registers
|
|---|
| 763 | ; #########################################################################
|
|---|
| 764 | DriveIO_MBR_Addressed Proc
|
|---|
| 765 | push ax
|
|---|
| 766 | push bx
|
|---|
| 767 |
|
|---|
| 768 | or bx,ax ; Results in 0 in BX if MBR is addressed by LBA
|
|---|
| 769 | jz DriveIO_MBR_Addressed_done
|
|---|
| 770 |
|
|---|
| 771 | mov ax,cx ; Results in 1 in AX if CYL 0, SEC 1 is addressed
|
|---|
| 772 | add al,dh ; Results in 1 in AX if HEAD 0 is addressed
|
|---|
| 773 | dec ax ; Results in 0 in AX if MBR is addressed by CHS
|
|---|
| 774 |
|
|---|
| 775 | DriveIO_MBR_Addressed_done:
|
|---|
| 776 | pop bx
|
|---|
| 777 | pop ax
|
|---|
| 778 | ret
|
|---|
| 779 | DriveIO_MBR_Addressed EndP
|
|---|
| 780 |
|
|---|
| 781 |
|
|---|
| 782 |
|
|---|
| 783 |
|
|---|
| 784 | ; #########################################################################
|
|---|
| 785 | ; Routine: Writes DS:SI to a specified sector
|
|---|
| 786 | ; #########################################################################
|
|---|
| 787 | ; Calling : bx:ax - Absolute sector
|
|---|
| 788 | ; cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
|
|---|
| 789 | ; ds:si - Source-Adress
|
|---|
| 790 | ; Returns : none
|
|---|
| 791 | ; Preserve: all registers
|
|---|
| 792 | ; #########################################################################
|
|---|
| 793 | DriveIO_SaveSector Proc Near Uses ax bx cx dx ds si es di
|
|---|
| 794 |
|
|---|
| 795 |
|
|---|
| 796 | ;!
|
|---|
| 797 | ;! DEBUG_BLOCK
|
|---|
| 798 | ;! Force write to LBA0 to test interception routine.
|
|---|
| 799 | ;! Do *NOT* enable unless you are debugging, will overwrite MBR !
|
|---|
| 800 | ;!
|
|---|
| 801 | ;~ __DIO_FORCE_LBA0_WRITE__ EQU
|
|---|
| 802 | IFDEF AUX_DEBUG
|
|---|
| 803 | IFDEF __DIO_FORCE_LBA0_WRITE__
|
|---|
| 804 | xor ax,ax
|
|---|
| 805 | xor bx,bx
|
|---|
| 806 | xor cx,cx
|
|---|
| 807 | inc cx
|
|---|
| 808 | xor dh,dh
|
|---|
| 809 | ENDIF
|
|---|
| 810 | ENDIF
|
|---|
| 811 |
|
|---|
| 812 |
|
|---|
| 813 | ;!
|
|---|
| 814 | ;! DEBUG_BLOCK
|
|---|
| 815 | ;! Check what is being written to disk.
|
|---|
| 816 | ;! Uncomment below to activate.
|
|---|
| 817 | ;!
|
|---|
| 818 | __DIO_SS_DMP__ EQU
|
|---|
| 819 | IFDEF AUX_DEBUG
|
|---|
| 820 | IFDEF __DIO_SS_DMP__
|
|---|
| 821 | pusha
|
|---|
| 822 | push si
|
|---|
| 823 | mov si,offset [dioss]
|
|---|
| 824 | call AuxIO_Print
|
|---|
| 825 | pop si
|
|---|
| 826 | call DEBUG_DumpRegisters
|
|---|
| 827 | call AuxIO_DumpSector
|
|---|
| 828 | call AuxIO_TeletypeNL
|
|---|
| 829 | popa
|
|---|
| 830 | ENDIF
|
|---|
| 831 | ENDIF
|
|---|
| 832 |
|
|---|
| 833 | ;
|
|---|
| 834 | ; Check if the MBR is the destination for the write.
|
|---|
| 835 | ; ZF=1 if so.
|
|---|
| 836 | ;
|
|---|
| 837 | call DriveIO_MBR_Addressed
|
|---|
| 838 | jnz DriveIO_SaveSector_continue_write
|
|---|
| 839 |
|
|---|
| 840 |
|
|---|
| 841 | ; MBR is addressed, check the sector that is requested to be written.
|
|---|
| 842 | ; For the bootdisk it should contain the AiR-BOOT signature, valid
|
|---|
| 843 | ; partition-table entries and the AA55h signature.
|
|---|
| 844 | ; If not, something is terribly wrong in some piece of the AB code.
|
|---|
| 845 | ; For any other disk (80h+) at least a valid partition table should
|
|---|
| 846 | ; be present together with the AA55h signature.
|
|---|
| 847 | call DriveIO_ProtectMBR
|
|---|
| 848 | jnc DriveIO_SaveSector_continue_write
|
|---|
| 849 |
|
|---|
| 850 |
|
|---|
| 851 | ;
|
|---|
| 852 | ; WE HAVE A SEVERE ERROR CONDITION !
|
|---|
| 853 | ; SOME AB CODE TRIES TO WRITE A NON-MBR TO THE DISK !
|
|---|
| 854 | ; ASK THE USER TO REPORT THIS !
|
|---|
| 855 | ; HALT THE SYSTEM !
|
|---|
| 856 | ;
|
|---|
| 857 |
|
|---|
| 858 | ; Show error-box
|
|---|
| 859 | mov cx, 0C04h
|
|---|
| 860 | mov si, offset NonMBRwrite
|
|---|
| 861 | call SETUP_ShowErrorBox
|
|---|
| 862 | mov cx, 0C04h
|
|---|
| 863 | mov si, offset NonMBRwrite_rep
|
|---|
| 864 | call SETUP_ShowErrorBox
|
|---|
| 865 |
|
|---|
| 866 |
|
|---|
| 867 | IFDEF AUX_DEBUG
|
|---|
| 868 | pusha
|
|---|
| 869 | mov si, offset NonMBRwrite
|
|---|
| 870 | call AuxIO_TeletypeNL
|
|---|
| 871 | call AuxIO_Print
|
|---|
| 872 | call AuxIO_TeletypeNL
|
|---|
| 873 | popa
|
|---|
| 874 | ENDIF
|
|---|
| 875 |
|
|---|
| 876 | ; Show popup and halt the system.
|
|---|
| 877 | jmp HaltSystem
|
|---|
| 878 |
|
|---|
| 879 |
|
|---|
| 880 |
|
|---|
| 881 | ;
|
|---|
| 882 | ; Continue the write if not MBR sector or MBR to write is validated.
|
|---|
| 883 | ;
|
|---|
| 884 | DriveIO_SaveSector_continue_write:
|
|---|
| 885 | test byte ptr cs:[CurIO_UseExtension], 1
|
|---|
| 886 | jz DIOSS_UseNormal
|
|---|
| 887 | ; Are we forced do use LBA via Setting?
|
|---|
| 888 | ; Always use INT13X on v1.0.8+.
|
|---|
| 889 | ;~ test byte ptr cs:[CFG_ForceLBAUsage], 1
|
|---|
| 890 | ;~ jnz DIOSS_UseExtension
|
|---|
| 891 | jmp DIOSS_UseExtension
|
|---|
| 892 | ; Is the drive not a harddrive?
|
|---|
| 893 | cmp dl, 80h
|
|---|
| 894 | jb DIOSS_UseNormal
|
|---|
| 895 | ; Upper 8 bits of LBA-address set? -> Use LBA (maximum boundary is FB0400h)
|
|---|
| 896 | or bh, bh
|
|---|
| 897 | jnz DIOSS_UseExtension
|
|---|
| 898 | ; Compare Switch-Table value to bit 16-23 of LBA-address
|
|---|
| 899 | mov di, dx
|
|---|
| 900 | and di, 007Fh
|
|---|
| 901 | cmp bptr cs:[LBASwitchTable+di], bl
|
|---|
| 902 | jbe DIOSS_UseExtension
|
|---|
| 903 | DIOSS_UseNormal:
|
|---|
| 904 | mov di, 3
|
|---|
| 905 | DIOSS_ErrorLoop:
|
|---|
| 906 | push ds
|
|---|
| 907 | pop es
|
|---|
| 908 | mov bx, si ; ES:BX - Destination
|
|---|
| 909 | mov ax, 0301h ; Function 3 - Write Sector
|
|---|
| 910 | int 13h
|
|---|
| 911 | jnc DIOSS_Success
|
|---|
| 912 | dec di
|
|---|
| 913 | jnz DIOSS_ErrorLoop
|
|---|
| 914 | call MBR_SaveError
|
|---|
| 915 |
|
|---|
| 916 | DIOSS_UseExtension:
|
|---|
| 917 | push cx
|
|---|
| 918 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
|
|---|
| 919 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
|
|---|
| 920 | mov cx, ds
|
|---|
| 921 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
|
|---|
| 922 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
|
|---|
| 923 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
|
|---|
| 924 | push cs
|
|---|
| 925 | pop ds
|
|---|
| 926 | mov si, offset DriveIO_DAP
|
|---|
| 927 | mov ax, 4300h ; Extended Write (No Verify)
|
|---|
| 928 | int 13h
|
|---|
| 929 | pop cx
|
|---|
| 930 | jnc DIOSS_Success
|
|---|
| 931 | call MBR_SaveError
|
|---|
| 932 |
|
|---|
| 933 | DIOSS_Success:
|
|---|
| 934 | ret
|
|---|
| 935 | DriveIO_SaveSector EndP
|
|---|
| 936 |
|
|---|
| 937 |
|
|---|
| 938 |
|
|---|
| 939 | ; ------------------------------------------------------
|
|---|
| 940 | ; Rousseau: # Load the master LVM-sector if one exists #
|
|---|
| 941 | ; ------------------------------------------------------
|
|---|
| 942 | ; Load the master LVM-sector to get the number of sectors per track as
|
|---|
| 943 | ; OS/2 views the drive. If no master LVM-sector is found it is assumed OS/2
|
|---|
| 944 | ; is not installed. The master LVM-sector can be located at three different
|
|---|
| 945 | ; places depending on drive size and partitioning scheme and driver used.
|
|---|
| 946 | ; When DANIS506.ADD is used, the OS/2 extended geometry will be 255/127 for
|
|---|
| 947 | ; drives >502GiB but <1TiB. Then the location will be sector 127 which
|
|---|
| 948 | ; is LBA 126 (7Eh).
|
|---|
| 949 | ; IBM1S506.ADD will always use 255/255 for the extended OS/2 geometry.
|
|---|
| 950 | ; DANIS506.ADD will use 255/255 for drives >1TiB.
|
|---|
| 951 | ; Then the location of the master LVM-sector will be 255 which is LBA 254 (FEh).
|
|---|
| 952 | ; When OS/2 is installed on a huge drive that alread had a system on it, OS/2
|
|---|
| 953 | ; will be confined to the lower 502GiB of the drive.
|
|---|
| 954 | ; In this case the normal geometry from Int13X will be used.
|
|---|
| 955 | ; This is also the case when no valid master LVM-sector can be found.
|
|---|
| 956 | ;
|
|---|
| 957 | ; Return CF when valid master LVM sector found, NC if not.
|
|---|
| 958 | ; Loads sector at [LVMSector] !
|
|---|
| 959 | DriveIO_LoadMasterLVMSector Proc Near
|
|---|
| 960 | pusha
|
|---|
| 961 |
|
|---|
| 962 | ;~ mov si,offset db_lmlvm
|
|---|
| 963 | ;~ call AuxIO_Print
|
|---|
| 964 |
|
|---|
| 965 | ;~ ; Physical disk
|
|---|
| 966 | ;~ mov al,'<'
|
|---|
| 967 | ;~ call VideoIO_PrintSingleChar
|
|---|
| 968 | ;~ mov al,dl
|
|---|
| 969 | ;~ call VideoIO_PrintHexByte
|
|---|
| 970 | ;~ mov al,'>'
|
|---|
| 971 | ;~ call VideoIO_PrintSingleChar
|
|---|
| 972 | ;~
|
|---|
| 973 | ;~ call AuxIO_TeletypeHexByte
|
|---|
| 974 | ;~ call AuxIO_TeletypeNL
|
|---|
| 975 |
|
|---|
| 976 |
|
|---|
| 977 | ; Loop over the sector-translation table,
|
|---|
| 978 | ; process the first three values from high (255) to low.
|
|---|
| 979 | ; (bios spt, most likely 63)
|
|---|
| 980 | mov cx,3
|
|---|
| 981 | DriveIO_LoadMasterLVMSector_NextTry:
|
|---|
| 982 | ; Number of sectors to read
|
|---|
| 983 | mov [DriveIO_DAP_NumBlocks],1
|
|---|
| 984 |
|
|---|
| 985 | ; Setup destination address
|
|---|
| 986 | mov si, offset [LVMSector]
|
|---|
| 987 | mov word ptr [DriveIO_DAP_Transfer+0],si
|
|---|
| 988 | mov ax, ds
|
|---|
| 989 | mov word ptr [DriveIO_DAP_Transfer+2],ax
|
|---|
| 990 |
|
|---|
| 991 | ; Get the sector-number of the next possible LVM sector (255,127,63)
|
|---|
| 992 | ; using the translation table and the counter as the index
|
|---|
| 993 | mov bx,offset secs_per_track_table
|
|---|
| 994 | mov ax,cx
|
|---|
| 995 | dec ax
|
|---|
| 996 | xlatb
|
|---|
| 997 | dec al
|
|---|
| 998 |
|
|---|
| 999 | ;
|
|---|
| 1000 | ; AX now contains the LBA address of the sector
|
|---|
| 1001 | ; that could be an LVM sector.
|
|---|
| 1002 | ; This is all in track0 so the address will not exceed 64kiB sectors.
|
|---|
| 1003 | ;
|
|---|
| 1004 |
|
|---|
| 1005 | ;~ push ax
|
|---|
| 1006 | ;~ push ax
|
|---|
| 1007 | ;~ mov al,'$'
|
|---|
| 1008 | ;~ call VideoIO_PrintSingleChar
|
|---|
| 1009 | ;~ pop ax
|
|---|
| 1010 | ;~ call VideoIO_PrintHexByte
|
|---|
| 1011 | ;~ mov al,'$'
|
|---|
| 1012 | ;~ call VideoIO_PrintSingleChar
|
|---|
| 1013 | ;~ pop ax
|
|---|
| 1014 |
|
|---|
| 1015 | IFDEF AUX_DEBUG
|
|---|
| 1016 | ; Dump the value
|
|---|
| 1017 | ;~ call AuxIO_TeletypeHexByte
|
|---|
| 1018 | ;~ call AuxIO_TeletypeNL
|
|---|
| 1019 | ENDIF
|
|---|
| 1020 |
|
|---|
| 1021 | ; Setup the requested LBA sector number
|
|---|
| 1022 | mov word ptr [DriveIO_DAP_Absolute+0],ax ; LBA low NORMAL I/O GEBRUIKEN !
|
|---|
| 1023 | mov word ptr [DriveIO_DAP_Absolute+2],00h ; LBA high
|
|---|
| 1024 | mov si, offset DriveIO_DAP ; address request packet
|
|---|
| 1025 | mov ah, 42h
|
|---|
| 1026 | int 13h ; do the i/o
|
|---|
| 1027 | cmc ; Complement carry so we can exit imm. on error
|
|---|
| 1028 | jnc DriveIO_LoadMasterLVMSector_End ; oops, return with NC
|
|---|
| 1029 |
|
|---|
| 1030 |
|
|---|
| 1031 | mov si,offset [LVMSector]
|
|---|
| 1032 |
|
|---|
| 1033 | ; See if this is a valid LVM-sector
|
|---|
| 1034 | ; ZF=0 if valid
|
|---|
| 1035 | call LVM_ValidateSector
|
|---|
| 1036 |
|
|---|
| 1037 | ; pushf
|
|---|
| 1038 | ; mov ah,0
|
|---|
| 1039 | ; rcl ah,1
|
|---|
| 1040 | ; mov al,'|'
|
|---|
| 1041 | ; call VideoIO_PrintSingleChar
|
|---|
| 1042 | ; mov al,ah
|
|---|
| 1043 | ; call VideoIO_PrintHexByte
|
|---|
| 1044 | ; mov al,'|'
|
|---|
| 1045 | ; call VideoIO_PrintSingleChar
|
|---|
| 1046 | ; popf
|
|---|
| 1047 |
|
|---|
| 1048 |
|
|---|
| 1049 | ; Yep, we found the master LVM-sector
|
|---|
| 1050 | jnz DriveIO_LoadMasterLVMSector_Found
|
|---|
| 1051 | ; Try next location
|
|---|
| 1052 | loop DriveIO_LoadMasterLVMSector_NextTry
|
|---|
| 1053 |
|
|---|
| 1054 | ; No master LVM-sector found, set CF=false
|
|---|
| 1055 | clc
|
|---|
| 1056 |
|
|---|
| 1057 | DriveIO_LoadMasterLVMSector_Found:
|
|---|
| 1058 | ; Store the address for later use.
|
|---|
| 1059 | mov ax, word ptr [DriveIO_DAP_Absolute]
|
|---|
| 1060 | mov word ptr [MasterLVMLBA], ax
|
|---|
| 1061 |
|
|---|
| 1062 | DriveIO_LoadMasterLVMSector_End:
|
|---|
| 1063 | popa
|
|---|
| 1064 | ret
|
|---|
| 1065 | DriveIO_LoadMasterLVMSector Endp
|
|---|
| 1066 |
|
|---|
| 1067 |
|
|---|
| 1068 |
|
|---|
| 1069 |
|
|---|
| 1070 | ; ---------------------------------------------------
|
|---|
| 1071 | ; Rousseau ## Large drives, (OS/2) geometry and LBA ##
|
|---|
| 1072 | ; ---------------------------------------------------
|
|---|
| 1073 | ; A sector size of 512 bytes is assumed in the below calculations.
|
|---|
| 1074 | ; Note that this scheme changes when the sector size will be 4096 or larger,
|
|---|
| 1075 | ; like with modern drives that do not translate to 512 bytes per sector anymore.
|
|---|
| 1076 | ; These drives will have a capacity above the 2TiB LBA32 boundary.
|
|---|
| 1077 | ; For now, we assume drives <=2TiB with a sector size of 512 bytes.
|
|---|
| 1078 |
|
|---|
| 1079 | ; There are a few boundaries that are of importance.
|
|---|
| 1080 | ; Note that these are disk-boundaries and not partition boundaries.
|
|---|
| 1081 | ; Even with a small partition, like <502GiB, OS/2 will use extended geometry on
|
|---|
| 1082 | ; an empty huge disk.
|
|---|
| 1083 | ; These boundaries are (from high to low):
|
|---|
| 1084 |
|
|---|
| 1085 | ; (code 5)
|
|---|
| 1086 | ; 2^32 = 4294967296 = 100000000 sectors = 2048 GiB
|
|---|
| 1087 | ; This is the LBA32 2TiB boundary.
|
|---|
| 1088 | ; Everything above it must be addressed using LBA48.
|
|---|
| 1089 | ; OS/2 can currently not address this space above.
|
|---|
| 1090 |
|
|---|
| 1091 | ; (code4)
|
|---|
| 1092 | ; 65536*255*255 = 4261478400 = FE010000 sectors ~ 2032 GiB
|
|---|
| 1093 | ; This is the max OS/2 boundary using 255/255 extended geometry.
|
|---|
| 1094 | ; OS/2 can currently not address this space above.
|
|---|
| 1095 |
|
|---|
| 1096 | ; (code 3)
|
|---|
| 1097 | ; 2^31 = 2147483648 = 80000000 sectors = 1024 GiB
|
|---|
| 1098 | ; This is the LBA32 1TiB boundary.
|
|---|
| 1099 | ; OS/2 can address this space and will use 255/255 extended geometry.
|
|---|
| 1100 |
|
|---|
| 1101 | ; (code 2)
|
|---|
| 1102 | ; 65536*255*127 = 2122383360 = 7E810000 sectors ~ 1012 GiB
|
|---|
| 1103 | ; This is the DANI 1TiB boundary.
|
|---|
| 1104 | ; OS/2 can address this space and will use 255/255 extended geometry.
|
|---|
| 1105 | ; Below this DANI will use 255/127 extended geometry.
|
|---|
| 1106 | ; This matters on where the LVM-sectors are located !
|
|---|
| 1107 |
|
|---|
| 1108 | ; (code 1)
|
|---|
| 1109 | ; 65536*255*63 = 1052835840 = 3EC10000 sectors ~ 502 GiB
|
|---|
| 1110 | ; This is the current OS/2 limit using this geometry because OS/2 can
|
|---|
| 1111 | ; currently not address more than 65536 cylinders.
|
|---|
| 1112 | ; DANI will address space above with 255/127 extended geometry up until
|
|---|
| 1113 | ; the DANI 1TiB boundary (code 2)
|
|---|
| 1114 |
|
|---|
| 1115 | ; (code 0)
|
|---|
| 1116 | ; Everything below 65536*255*63 will be addressed using standard geometry.
|
|---|
| 1117 |
|
|---|
| 1118 |
|
|---|
| 1119 | ;
|
|---|
| 1120 | ; This function will return the following values:
|
|---|
| 1121 | ;
|
|---|
| 1122 |
|
|---|
| 1123 | ; 5 = This drive is above the 2^32 LBA32 (2TB) boundary and has more
|
|---|
| 1124 | ; than 4294967296 sectors.
|
|---|
| 1125 | ; LBA48 addressing is needed to access the complete capacity of the drive.
|
|---|
| 1126 | ; OS/2 is currently unable to do so.
|
|---|
| 1127 |
|
|---|
| 1128 | ; 4 = This drive is above the 65536*255*255 (4261478400) boundary but below 2^32.
|
|---|
| 1129 | ; This is an OS/2 boundary and OS/2 is not able to access the drive above
|
|---|
| 1130 | ; this boundary.
|
|---|
| 1131 |
|
|---|
| 1132 | ; 3 = This drive is above the 2^31 (1TB) boundary and has more than
|
|---|
| 1133 | ; 2147483648 sectors.
|
|---|
| 1134 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1135 | ; Both DANIS506 and IBM1S506 will use the 255/255 scheme.
|
|---|
| 1136 |
|
|---|
| 1137 | ; 2 = This drive is above the 65536*255*127 (2122383360) boundary but below 2^31.
|
|---|
| 1138 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1139 | ; Both DANIS506 and IBM1S506 will use the 255/255 scheme.
|
|---|
| 1140 |
|
|---|
| 1141 | ; 1 = This drive is above the 65536*255*63 (1052835840) boundary but
|
|---|
| 1142 | ; below 65536*255*127.
|
|---|
| 1143 | ; OS/2 is able to access the drive using it's extended geometry.
|
|---|
| 1144 | ; Note that DANIS506 will use 255/127 and IBM1S506 will use 255/255 geometry !
|
|---|
| 1145 | ; Using DANI or IBM influences the location of the LVM info-sectors !
|
|---|
| 1146 |
|
|---|
| 1147 | ; 0 = This drive is below the 65536*255*63 (1052835840) boundary.
|
|---|
| 1148 | ; OS/2 is able to access this drive using the standard 255/63 geometry.
|
|---|
| 1149 |
|
|---|
| 1150 | ; So, any return value >0 means OS/2 extended geometry will be used.
|
|---|
| 1151 | ; Value 1 will use 255/127 with DANIS506 but 255/255 with IBM1S506.
|
|---|
| 1152 | ; Values 2 and 3 will use 255/255 on both drivers.
|
|---|
| 1153 | ; You can or with 0x01 and check for 3 in this case.
|
|---|
| 1154 | ; Any value above 3 will be a drive who's capacity cannot be fully used by OS/2
|
|---|
| 1155 | ; The upper limit of 65536*255*255 will be in effect here.
|
|---|
| 1156 |
|
|---|
| 1157 | ; Note this function currently handles the boot-drive only !
|
|---|
| 1158 | ; It should be extended and use dl for the drive-number as a parameter.
|
|---|
| 1159 | ; Because we use this function to get this info in a number of places,
|
|---|
| 1160 | ; all regs and flags except AX are saved and restored.
|
|---|
| 1161 |
|
|---|
| 1162 | ; DL contains BIOS disk-number; 80h for first, 81h for second, etc.
|
|---|
| 1163 | DriveIO_GatherDiskInfo Proc Near
|
|---|
| 1164 | pushf
|
|---|
| 1165 | push bx
|
|---|
| 1166 | push cx
|
|---|
| 1167 | push dx
|
|---|
| 1168 | push si
|
|---|
| 1169 | push di
|
|---|
| 1170 | push es
|
|---|
| 1171 |
|
|---|
| 1172 | ; Set ES to CS for buffer clearing
|
|---|
| 1173 | push cs
|
|---|
| 1174 | pop es
|
|---|
| 1175 |
|
|---|
| 1176 | ; Clear the buffer
|
|---|
| 1177 | ; Also setup the buffer size.
|
|---|
| 1178 | ; Old Phoenix BIOSses require word (flags) at 02 to be zero,
|
|---|
| 1179 | ; so we clear the whole buffer to be sure.
|
|---|
| 1180 | mov cx, i13xbuf_size ; Dynamically calculated by assembler.
|
|---|
| 1181 | mov di, offset i13xbuf ; Points to size field.
|
|---|
| 1182 | mov [di],cx ; Setup buffer-size.
|
|---|
| 1183 | inc di
|
|---|
| 1184 | inc di ; Now pointing at actual buffer.
|
|---|
| 1185 | xor ah,ah ; Fill value.
|
|---|
| 1186 | cld ; Direction up.
|
|---|
| 1187 | rep stosb ; Clear buffer.
|
|---|
| 1188 |
|
|---|
| 1189 | ; Get the drive parameters
|
|---|
| 1190 | mov ah, 48h ; Get Drive Parameters (extended version)
|
|---|
| 1191 | ;mov dl, 80h ; Drive number
|
|---|
| 1192 | mov si, offset i13xbuf ; Buffer for result-info
|
|---|
| 1193 | push dx
|
|---|
| 1194 | int 13h ; Call the BIOS-function
|
|---|
| 1195 | pop dx
|
|---|
| 1196 |
|
|---|
| 1197 | ; Do some error-checking
|
|---|
| 1198 | or ah,ah ; AH is zero if no error (ZF=1 if no error)
|
|---|
| 1199 | mov ax,0 ; Setup code for non-huge drive (does not influence ZF)
|
|---|
| 1200 | jz DriveIO_GatherDiskInfo_ok ; Return if error (AL<>0 thus ZF=0) but CY not set, assuming non-huge drive
|
|---|
| 1201 | jnc DriveIO_GatherDiskInfo_ok ; Return if error (CY=1), assuming non-huge drive
|
|---|
| 1202 | jmp DriveIO_GatherDiskInfo_ret
|
|---|
| 1203 |
|
|---|
| 1204 |
|
|---|
| 1205 | DriveIO_GatherDiskInfo_ok:
|
|---|
| 1206 |
|
|---|
| 1207 | ;
|
|---|
| 1208 | ; Store the drive geometry
|
|---|
| 1209 | ;
|
|---|
| 1210 |
|
|---|
| 1211 | mov si, offset i13xbuf
|
|---|
| 1212 |
|
|---|
| 1213 | xor dh,dh
|
|---|
| 1214 | and dl,01111111b
|
|---|
| 1215 | shl dx,1
|
|---|
| 1216 | shl dx,1
|
|---|
| 1217 |
|
|---|
| 1218 | ; Store number of cylinders on disk
|
|---|
| 1219 | mov bx, offset BIOS_Cyls
|
|---|
| 1220 | add bx,dx
|
|---|
| 1221 | mov ax,[si+04h]
|
|---|
| 1222 |
|
|---|
| 1223 | mov word ptr [bx+00],ax
|
|---|
| 1224 | mov ax,[si+06]
|
|---|
| 1225 | mov word ptr [bx+02],ax
|
|---|
| 1226 |
|
|---|
| 1227 | ; Store number of heads per cylinder
|
|---|
| 1228 | mov bx, offset BIOS_Heads
|
|---|
| 1229 | add bx,dx
|
|---|
| 1230 | mov ax,[si+08h]
|
|---|
| 1231 | mov word ptr [bx+00],ax
|
|---|
| 1232 | mov ax,[si+0ah]
|
|---|
| 1233 | mov word ptr [bx+02],ax
|
|---|
| 1234 |
|
|---|
| 1235 | ; Store number of sectors per track
|
|---|
| 1236 | mov bx, offset BIOS_Secs
|
|---|
| 1237 | add bx,dx
|
|---|
| 1238 | mov ax,[si+0ch]
|
|---|
| 1239 | mov word ptr [bx+00],ax
|
|---|
| 1240 |
|
|---|
| 1241 | ; Update first byte of translation-table to conform to BIOS SPT
|
|---|
| 1242 | mov byte ptr [secs_per_track_table], al
|
|---|
| 1243 |
|
|---|
| 1244 | mov ax,[si+0eh]
|
|---|
| 1245 | mov word ptr [bx+02],ax
|
|---|
| 1246 |
|
|---|
| 1247 | ; Store total secs
|
|---|
| 1248 | mov bx, offset BIOS_TotalSecs
|
|---|
| 1249 | add bx,dx
|
|---|
| 1250 | add bx,dx
|
|---|
| 1251 | mov ax,[si+10h]
|
|---|
| 1252 |
|
|---|
| 1253 | mov word ptr [bx+00],ax
|
|---|
| 1254 | mov ax,[si+12h]
|
|---|
| 1255 | mov word ptr [bx+02],ax
|
|---|
| 1256 | mov ax,[si+14h]
|
|---|
| 1257 | mov word ptr [bx+04],ax
|
|---|
| 1258 | mov ax,[si+18h]
|
|---|
| 1259 | mov word ptr [bx+06],ax
|
|---|
| 1260 |
|
|---|
| 1261 | ; Store number of bytes per sector
|
|---|
| 1262 | mov bx, offset BIOS_Bytes
|
|---|
| 1263 | add bx,dx
|
|---|
| 1264 | mov ax,[si+18h]
|
|---|
| 1265 | mov [bx],ax
|
|---|
| 1266 |
|
|---|
| 1267 |
|
|---|
| 1268 | ;
|
|---|
| 1269 | ; See of it's a huge drive of not
|
|---|
| 1270 | ;
|
|---|
| 1271 |
|
|---|
| 1272 | ; Drive is larger than 2TiB
|
|---|
| 1273 | mov ax,5 ; Drive code (5)
|
|---|
| 1274 | mov bx, [si+14h] ; Low word of high dword of sector-count
|
|---|
| 1275 | or bx, [si+16h] ; High word of high dword of sector-count
|
|---|
| 1276 | jnz DriveIO_GatherDiskInfo_ret ; If non-zero we have a drive with >2^32 sectors and thus LBA48 addressing
|
|---|
| 1277 |
|
|---|
| 1278 | ; Drive is larger than max OS/2 capacity
|
|---|
| 1279 | dec ax ; Drive code (4)
|
|---|
| 1280 | mov bx, [si+12h] ; High word of low dword of sector-count
|
|---|
| 1281 | cmp bx, 0fe01h ; Boundary
|
|---|
| 1282 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1283 | ; we have a drive larger than to 65536*255*255 = FE010000 sectors
|
|---|
| 1284 |
|
|---|
| 1285 | ; Drive can be completely utilized by OS/2
|
|---|
| 1286 | dec ax ; Drive code (3)
|
|---|
| 1287 | cmp bx, 8000h ; Boundary
|
|---|
| 1288 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1289 | ; we have a drive larger than 2^31 sectors but smaller than 65536*255*255
|
|---|
| 1290 |
|
|---|
| 1291 | ; This is the small area between DANI 1TiB and LBA 1TiB
|
|---|
| 1292 | dec ax ; Drive code (2)
|
|---|
| 1293 | cmp bx, 7e81h ; Boundary
|
|---|
| 1294 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1295 | ; we have a drive larger than 65536*255*127 but <65536*255*255
|
|---|
| 1296 | ; DANIS506.ADD will use 255/255 extended geometry
|
|---|
| 1297 |
|
|---|
| 1298 | ; DANI will use 255/127 in this area, this could impact the location of LVM-sectors ! (last sec on track)
|
|---|
| 1299 | dec ax ; Drive code (1)
|
|---|
| 1300 | cmp bx, 3ec1h ; Boundary
|
|---|
| 1301 | jae DriveIO_GatherDiskInfo_ret ; If above or equal to boundary,
|
|---|
| 1302 | ; we have a drive larger than 65536*255*63 sectors (OS/2 502GiB Limit!)
|
|---|
| 1303 | ; DANIS506.ADD will use 255/127 extended geometry !
|
|---|
| 1304 | ; IBM1S506.ADD will use 255/255 extended geometry !
|
|---|
| 1305 |
|
|---|
| 1306 | ; We have a drive that can be addressed using standard 255/63 geometry
|
|---|
| 1307 | dec ax ; Drive code (0)
|
|---|
| 1308 | ; We have a drive smaller than 65536*255*63 = 3EC10000 sectors
|
|---|
| 1309 |
|
|---|
| 1310 | DriveIO_GatherDiskInfo_ret:
|
|---|
| 1311 | pop es
|
|---|
| 1312 | pop di
|
|---|
| 1313 | pop si
|
|---|
| 1314 | pop dx
|
|---|
| 1315 | pop cx
|
|---|
| 1316 | pop bx
|
|---|
| 1317 |
|
|---|
| 1318 | mov byte ptr [CurIO_UseExtension],1
|
|---|
| 1319 |
|
|---|
| 1320 | popf
|
|---|
| 1321 | ret
|
|---|
| 1322 | DriveIO_GatherDiskInfo EndP
|
|---|
| 1323 |
|
|---|
| 1324 |
|
|---|
| 1325 |
|
|---|
| 1326 | ; Values for sectors per track table corresponding to DriveIO_IsHugeDrive return value.
|
|---|
| 1327 | secs_per_track_table db 63,127,255,255,255,255
|
|---|
| 1328 |
|
|---|
| 1329 | ;db_lmlvm: db 'Load Master LVM -- disk: ',0
|
|---|
