| 1 |
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| 2 | ; Disclaimer:
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| 3 | ;=============
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| 4 | ; The sourcecode is released via www.netlabs.org CVS *ONLY*.
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| 5 | ; You MUST NOT upload it to other servers nor republish it in any way.
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| 6 | ; The sourcecode is still COPYRIGHTED and NOT RELEASED UNDER GPL.
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| 7 | ; It's (c) Copyright 1998-2003 by Martin Kiewitz.
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| 8 | ; You may recompile the source and do *PRIVATE* modifications, but please keep
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| 9 | ; in mind that modifying this code needs at least *some* assembly skill. If
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| 10 | ; you mess up your system, because you needed to hack your way through, don't
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| 11 | ; blame me. Releasing a customized version of AiR-BOOT, selling it in any form
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| 12 | ; or reusing parts of this source is *PROHIBITED*. Ask me, if you have some
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| 13 | ; idea about new functionality *before* developing the code, otherwise I will
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| 14 | ; definitely reject it. Also please accept, that I have some basic design
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| 15 | ; rules on AiR-BOOT and I will maintain them at all costs, so this won't get
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| 16 | ; another GRUB.
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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 | ; Note: Some routines set DS/ES to CS, even if its not needed.
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| 23 | ; This was done for SECURITY. So DO NOT remove it. Its there to make
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| 24 | ; sure the correct data is loaded/written to/from harddrive.
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| 25 | ;
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| 26 | ; IF YOU MODIFY ANYTHING IN HERE, YOU CAN EASILY BREAK YOUR HARDDRIVE!
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| 27 |
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| 28 | ; Will only load base-configuration, will NOT load IPT nor Hide-Config
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| 29 | ; Those are originally loaded on startup and will NOT get reloaded.
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| 30 | DriveIO_LoadConfiguration Proc Near Uses ax bx cx dx es
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| 31 | mov ax, cs
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| 32 | mov es, ax
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| 33 | mov bx, offset Configuration
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| 34 | mov dx, 0080h ; First harddrive, Sector 55...
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| 35 | mov cx, 0037h
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| 36 | mov ax, 0201h ; Function 02, read 1 sector...
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| 37 | int 13h
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| 38 | jnc DIOLC_NoError
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| 39 | call MBR_LoadError ; Will Abort BootUp
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| 40 | DIOLC_NoError:
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| 41 | ret
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| 42 | DriveIO_LoadConfiguration EndP
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| 43 |
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| 44 | DriveIO_SaveConfiguration Proc Near Uses ax bx cx dx ds es si
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| 45 | mov ax, cs
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| 46 | mov ds, ax
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| 47 | mov es, ax ; Safety first (CS==DS==ES)
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| 48 | ; --- Overwrite Floppy-Name with "FloppyDrive"
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| 49 | mov si, offset TXT_Floppy_Drive
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| 50 | mov di, offset PartitionTable
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| 51 | sub di, 30 ; Adjust to Floppy-Name
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| 52 | mov cx, 11
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| 53 | rep movsb
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| 54 | mov si, offset Configuration ; Calculate new checksum
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| 55 | xor bx, bx
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| 56 | mov cx, 5 ; Total of 5 Config-Sectors
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| 57 | mov dx, [CFG_CheckConfig]
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| 58 | mov [CFG_CheckConfig], bx
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| 59 | DIOSC_Loop:
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| 60 | call MBR_GetCheckOfSector
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| 61 | loop DIOSC_Loop
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| 62 | mov [CFG_CheckConfig], bx
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| 63 | ; --------------------------------------------------------------------
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| 64 | ; ES == CS
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| 65 | mov bx, offset Configuration
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| 66 | mov dx, 0080h ; First harddrive, Sector 55...
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| 67 | mov cx, 0037h
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| 68 | mov ax, 0305h ; Function 03, 5 sectors to write
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| 69 | int 13h
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| 70 | jnc DIOSC_NoError
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| 71 | call MBR_SaveError ; Will Abort BootUp
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| 72 | DIOSC_NoError:
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| 73 | ret
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| 74 | DriveIO_SaveConfiguration EndP
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| 75 |
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| 76 | DriveIO_UpdateFloppyName Proc Near Uses bx cx dx ds si es di
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| 77 | mov ax, cs
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| 78 | mov ds, ax
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| 79 | mov es, ax
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| 80 |
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| 81 | mov ah, 00h ; Function 2 - Reset Drive
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| 82 | xor dl, dl
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| 83 | int 13h
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| 84 | xor dx, dx ; Cylinder=0, Head=0
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| 85 | mov cx, 1 ; Sector=1, Drive=0
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| 86 | mov bx, offset TmpSector ; ES:BX - TmpSector
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| 87 | mov ax, 0201h ; Function 2 - Load Sector
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| 88 | int 13h
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| 89 | jnc DIOUFN_AllFine
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| 90 |
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| 91 | ; --- Overwrite Floppy-Name with "No Disc"
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| 92 | mov si, offset TXT_Floppy_NoDisc
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| 93 | xor ax, ax
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| 94 | DIOUFN_WriteFloppyName:
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| 95 | mov di, offset PartitionTable
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| 96 | sub di, 30 ; Adjust to Floppy-Name
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| 97 | mov cl, 11
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| 98 | rep movsb
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| 99 | ret ; AX=-1 -> GotDisc, =0 -> NoDisc
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| 100 |
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| 101 | ; --- Floppy found and read, data in TempSector
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| 102 | DIOUFN_AllFine:
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| 103 | mov ax, -1
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| 104 | mov si, offset TXT_Floppy_NoName
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| 105 | cmp wptr es:[bx+54], 'AF'
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| 106 | jne DIOUFN_WriteFloppyName
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| 107 | cmp wptr es:[bx+56], '1T'
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| 108 | jne DIOUFN_WriteFloppyName
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| 109 | cmp bptr es:[bx+58], '2'
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| 110 | jne DIOUFN_WriteFloppyName
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| 111 | mov si, bx
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| 112 | add si, 43 ; FAT12 - Volume Label Location
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| 113 | jmp DIOUFN_WriteFloppyName
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| 114 | DriveIO_UpdateFloppyName EndP
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| 115 |
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| 116 | ; =============================================================================
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| 117 | ; HARDDRIVE / GENERAL ACCESS
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| 118 | ; =============================================================================
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| 119 | ; The following routines are used for harddisc/floppy access.
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| 120 | ; The access is done via INT 13h/CHS or INT 13h/LBA.
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| 121 | ; Access will be done prefered by INT 13h/CHS, because it's (I wonder!) much
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| 122 | ; faster, than the LBA-method. I don't know, why LBA is so slow. Perhaps BIOS.
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| 123 | ;
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| 124 | ; Internal access (to AiR-BOOT) is always done via INT 13h/CHS.
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| 125 |
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| 126 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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| 127 | Routine: Loads partition to ExecBase and checks for validity
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| 128 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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| 129 | Calling : bx:ax - Absolute sector
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| 130 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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| 131 | Returns : Carry Set if invalid partition encountered
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| 132 | Preserve: all registers
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| 133 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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| 134 | DriveIO_LoadPartition Proc Near Uses ds si
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| 135 | int 3
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| 136 | mov wptr cs:[CurPartition_Location+0], ax
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| 137 | mov wptr cs:[CurPartition_Location+2], bx
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| 138 | mov wptr cs:[CurPartition_Location+4], dx
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| 139 | mov wptr cs:[CurPartition_Location+6], cx ; Saves the location
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| 140 | push ExecBaseSeg
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| 141 | pop ds
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| 142 | mov si, ExecBasePtr ; DS:SI - ExecBase
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| 143 | call DriveIO_LoadSector
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| 144 | clc
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| 145 | cmp word ptr ds:[si+LocBR_Magic], 0AA55h
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| 146 | je DIOLP_Success
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| 147 | ; We check, if we are scanning partitions. In that case, if CHS is not 0/0/1
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| 148 | ; we will display a "bad partition table" message and halt the system.
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| 149 | cmp cx, 0001h
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| 150 | jne DIOLP_Failed
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| 151 | or dh, dh
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| 152 | jnz DIOLP_Failed
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| 153 | stc ; Set carry, so no partition table
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| 154 | DIOLP_Success:
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| 155 | ret
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| 156 | DIOLP_Failed:
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| 157 | jmp DriveIO_GotLoadError
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| 158 | DriveIO_LoadPartition EndP
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| 159 |
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| 160 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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| 161 | Routine: Writes a partition from ExecBase to its original sector
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| 162 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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| 163 | Calling : none
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| 164 | Returns : none
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| 165 | Preserve: all registers
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| 166 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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| 167 | DriveIO_SavePartition Proc Near Uses ax bx cx dx ds si
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| 168 | mov ax, wptr cs:[CurPartition_Location+0]
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| 169 | mov bx, wptr cs:[CurPartition_Location+2]
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| 170 | mov dx, wptr cs:[CurPartition_Location+4]
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| 171 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets prev. saved location
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| 172 | push ExecBaseSeg
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| 173 | pop ds
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| 174 | mov si, ExecBasePtr ; DS:SI - ExecBase
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| 175 | call DriveIO_SaveSector
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| 176 | ret
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| 177 | DriveIO_SavePartition EndP
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| 178 |
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| 179 | ; Lsst DS:SI fr Aufrufer
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| 180 | DriveIO_LoadTmpSector Proc Near Uses
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| 181 | push cs
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| 182 | pop ds
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| 183 | mov si, offset TmpSector
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| 184 | call DriveIO_LoadSector
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| 185 | ret
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| 186 | DriveIO_LoadTmpSector EndP
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| 187 |
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| 188 | ; Lsst DS:SI fr Aufrufer
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| 189 | DriveIO_SaveTmpSector Proc Near Uses
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| 190 | push cs
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| 191 | pop ds
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| 192 | mov si, offset TmpSector
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| 193 | call DriveIO_SaveSector
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| 194 | ret
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| 195 | DriveIO_SaveTmpSector EndP
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| 196 |
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| 197 | ; Memory-Block that holds information for LBA-access via INT 13h
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| 198 | DriveIO_DAP: db 10h ; Size of paket
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| 199 | db 0 ; Reserved
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| 200 | DriveIO_DAP_NumBlocks dw 0 ; Number of blocks
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| 201 | DriveIO_DAP_Transfer dd 0 ; Transfer Adress
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| 202 | DriveIO_DAP_Absolute dd 0 ; Absolute Sector
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| 203 | dd 0 ; Second Part of QWORD
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| 204 |
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| 205 | ; Special error message instead of "LOAD ERROR" during partition scanning,
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| 206 | ; so users will notice that something is bad with their partition table(s)
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| 207 | DriveIO_GotLoadError Proc Near
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| 208 | test cs:CurIO_Scanning, 1 ; Must be CS:, cause DS!=CS here
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| 209 | jnz InScanMode
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| 210 | jmp MBR_LoadError
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| 211 | InScanMode:
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| 212 | mov si, offset TXT_BrokenPartitionTable
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| 213 | push cs
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| 214 | pop ds
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| 215 | call MBR_Teletype
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| 216 | jmp MBRLE_Halt
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| 217 | DriveIO_GotLoadError EndP
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| 218 |
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| 219 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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| 220 | Routine: Loads a specified sector to DS:DI
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| 221 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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| 222 | Calling : bx:ax - Absolute sector
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| 223 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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| 224 | ds:si - Destination-Adress
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| 225 | Returns : none
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| 226 | Preserve: all registers
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| 227 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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| 228 | DriveIO_LoadSector Proc Near Uses ax bx ds si es di
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| 229 | test cs:[CurIO_UseExtension], 1
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| 230 | jz DIOLS_UseNormal
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| 231 | ; LBA-boundary >16450560 (FB0400h)
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| 232 | cmp bx, 00FBh
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| 233 | jae DIOLS_UseExtension
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| 234 | ; or are we forced do use LBA?
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| 235 | test cs:[CFG_ForceLBAUsage], 1
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| 236 | jnz DIOLS_UseExtension
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| 237 | DIOLS_UseNormal:
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| 238 | mov di, 3
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| 239 | DIOLS_ErrorLoop:
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| 240 | push ds
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| 241 | pop es
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| 242 | mov bx, si ; ES:BX - Destination
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| 243 | mov ax, 0201h ; Function 2 - Load Sector
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| 244 | int 13h
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| 245 | jnc DIOLS_Success
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| 246 | dec di
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| 247 | jnz DIOLS_ErrorLoop
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| 248 | ; Sector load failed...
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| 249 | jmp DriveIO_GotLoadError
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| 250 |
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| 251 | DIOLS_UseExtension:
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| 252 | push cx
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| 253 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
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| 254 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
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| 255 | mov cx, ds
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| 256 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
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| 257 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
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| 258 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
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| 259 | push cs
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| 260 | pop ds
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| 261 | mov si, offset DriveIO_DAP
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| 262 | mov ah, 42h ; Extended Read
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| 263 | int 13h
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| 264 | pop cx
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| 265 | jnc DIOLS_Success
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| 266 | ; Sector load failed...
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| 267 | jmp DriveIO_GotLoadError
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| 268 |
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| 269 | DIOLS_Success:
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| 270 | ret
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| 271 | DriveIO_LoadSector EndP
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| 272 |
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| 273 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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| 274 | Routine: Writes DS:SI to a specified sector
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| 275 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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| 276 | Calling : bx:ax - Absolute sector
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| 277 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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| 278 | ds:si - Source-Adress
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| 279 | Returns : none
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| 280 | Preserve: all registers
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| 281 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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| 282 | DriveIO_SaveSector Proc Near Uses ax bx cx ds si es di
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| 283 | test cs:[CurIO_UseExtension], 1
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| 284 | jz DIOSS_UseNormal
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| 285 | ; LBA-boundary >16450560 (FB0400h)
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| 286 | cmp bx, 00FBh
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| 287 | jae DIOSS_UseExtension
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| 288 | ; or are we forced do use LBA?
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| 289 | test cs:[CFG_ForceLBAUsage], 1
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| 290 | jnz DIOSS_UseExtension
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| 291 | DIOSS_UseNormal:
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| 292 | mov di, 3
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| 293 | DIOSS_ErrorLoop:
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| 294 | push ds
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| 295 | pop es
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| 296 | mov bx, si ; ES:BX - Destination
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| 297 | mov ax, 0301h ; Function 3 - Write Sector
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| 298 | int 13h
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| 299 | jnc DIOSS_Success
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| 300 | dec di
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| 301 | jnz DIOSS_ErrorLoop
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| 302 | call MBR_SaveError
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| 303 |
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| 304 | DIOSS_UseExtension:
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| 305 | push cx
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| 306 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
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| 307 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
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| 308 | mov cx, ds
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| 309 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
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| 310 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
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| 311 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
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| 312 | push cs
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| 313 | pop ds
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| 314 | mov si, offset DriveIO_DAP
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| 315 | mov ax, 4300h ; Extended Write (No Verify)
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| 316 | int 13h
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| 317 | pop cx
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| 318 | jnc DIOSS_Success
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| 319 | call MBR_SaveError
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| 320 |
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| 321 | DIOSS_Success:
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| 322 | ret
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| 323 | DriveIO_SaveSector EndP
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