| 1 | ; File name : DriveXlate.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 15.3.2010
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| 4 | ; Last update : 2.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for swapping drive letters.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Translates drive number when entering INT 13h.
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| 13 | ;
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| 14 | ; DriveXlate_WhenEnteringInt13h
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| 15 | ; Parameters:
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| 16 | ; DL: Drive number to be possibly translated
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| 17 | ; DS: RAMVARS segment
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| 18 | ; Returns:
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| 19 | ; DL: Translated drive number
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| 20 | ; Corrupts registers:
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| 21 | ; DI
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | DriveXlate_WhenEnteringInt13h:
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| 25 | inc BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt]
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| 26 | cmp BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt], 1
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| 27 | je SHORT DriveXlate_ToOrBack
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| 28 | ret
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| 29 |
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| 30 |
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| 31 | ;--------------------------------------------------------------------
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| 32 | ; Translates drive number when leaving INT 13h.
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| 33 | ;
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| 34 | ; DriveXlate_WhenLeavingInt13h
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| 35 | ; Parameters:
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| 36 | ; DL: Drive number to be possibly translated
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| 37 | ; DS: RAMVARS segment
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| 38 | ; Returns:
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| 39 | ; DL: Translated drive number
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| 40 | ; Corrupts registers:
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| 41 | ; DI
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| 42 | ;--------------------------------------------------------------------
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| 43 | ALIGN JUMP_ALIGN
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| 44 | DriveXlate_WhenLeavingInt13h:
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| 45 | dec BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt]
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| 46 | jz SHORT DriveXlate_ToOrBack
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| 47 | ret
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| 48 |
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| 49 |
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| 50 | ;--------------------------------------------------------------------
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| 51 | ; Translates drive number to or back.
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| 52 | ;
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| 53 | ; DriveXlate_ToOrBack
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| 54 | ; Parameters:
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| 55 | ; DL: Drive number to be possibly translated
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| 56 | ; DS: RAMVARS segment
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| 57 | ; Returns:
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| 58 | ; DL: Translated drive number
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| 59 | ; Corrupts registers:
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| 60 | ; DI
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| 61 | ;--------------------------------------------------------------------
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| 62 | ALIGN JUMP_ALIGN
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| 63 | DriveXlate_ToOrBack:
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| 64 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_DRVXLAT
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| 65 | jz SHORT .Return ; Return if translation disabled
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| 66 | xchg di, ax ; Backup AX
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| 67 | call DriveXlate_SwapFloppyDriveOrHardDisk
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| 68 | xchg ax, di
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| 69 | .Return:
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| 70 | ret
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| 71 |
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| 74 | ; Swaps Floppy Drive or Hard Disk number.
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| 75 | ;
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| 76 | ; DriveXlate_SwapFloppyDriveOrHardDisk
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| 77 | ; Parameters:
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| 78 | ; DL: Drive number to be possibly swapped
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| 79 | ; DS: RAMVARS segment
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| 80 | ; Returns:
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| 81 | ; DL: Translated drive number
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| 82 | ; Corrupts registers:
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| 83 | ; AX
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| 84 | ;--------------------------------------------------------------------
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| 85 | ALIGN JUMP_ALIGN
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| 86 | DriveXlate_SwapFloppyDriveOrHardDisk:
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| 87 | test dl, 80h ; Hard disk?
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| 88 | jnz SHORT DriveXlate_SwapHardDisk ; If so, jump to swap
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| 89 | ; Fall to DriveXlate_SwapFloppyDrive
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| 90 |
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| 91 | ;--------------------------------------------------------------------
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| 92 | ; Swaps Floppy Drive number.
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| 93 | ;
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| 94 | ; DriveXlate_SwapFloppyDrive
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| 95 | ; Parameters:
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| 96 | ; DL: Drive number to be possibly swapped
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| 97 | ; DS: RAMVARS segment
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| 98 | ; Returns:
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| 99 | ; DL: Translated drive number
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| 100 | ; Corrupts registers:
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| 101 | ; AX
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| 102 | ;--------------------------------------------------------------------
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| 103 | ;ALIGN JUMP_ALIGN
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| 104 | DriveXlate_SwapFloppyDrive:
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| 105 | eMOVZX ax, BYTE [RAMVARS.xlateVars+XLATEVARS.bFDSwap]
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| 106 | jmp SHORT DriveXlate_SwapDrive
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| 107 |
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| 108 | ;--------------------------------------------------------------------
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| 109 | ; Swaps Hard Disk number.
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| 110 | ;
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| 111 | ; DriveXlate_SwapHardDisk
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| 112 | ; Parameters:
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| 113 | ; DL: Drive number to be possibly swapped
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| 114 | ; DS: RAMVARS segment
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| 115 | ; Returns:
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| 116 | ; DL: Translated drive number
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| 117 | ; Corrupts registers:
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| 118 | ; AX
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| 119 | ;--------------------------------------------------------------------
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| 120 | ALIGN JUMP_ALIGN
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| 121 | DriveXlate_SwapHardDisk:
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| 122 | mov ah, 80h
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| 123 | mov al, BYTE [RAMVARS.xlateVars+XLATEVARS.bHDSwap]
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| 124 | ; Fall to DriveXlate_SwapDrive
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| 125 |
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| 126 | ;--------------------------------------------------------------------
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| 127 | ; Swaps Hard Disk or Floppy Drive number.
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| 128 | ;
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| 129 | ; DriveXlate_SwapDrive
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| 130 | ; Parameters:
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| 131 | ; AL: Drive number to swap to 00h/80h
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| 132 | ; AH: 00h/80h to be swapped to stored drive number
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| 133 | ; DL: Drive number to be possibly swapped
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| 134 | ; Returns:
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| 135 | ; DL: Translated drive number
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| 136 | ; Corrupts registers:
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| 137 | ; Nothing
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| 138 | ;--------------------------------------------------------------------
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| 139 | ;ALIGN JUMP_ALIGN
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| 140 | DriveXlate_SwapDrive:
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| 141 | cmp ah, dl ; Swap DL from 00h/80h to xxh?
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| 142 | je SHORT .SwapToXXhInAL
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| 143 | cmp al, dl ; Swap DL from xxh to 00h/80h?
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| 144 | je SHORT .SwapTo00hOr80hInAH
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| 145 | ret
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| 146 | ALIGN JUMP_ALIGN
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| 147 | .SwapTo00hOr80hInAH:
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| 148 | mov dl, ah
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| 149 | ret
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| 150 | ALIGN JUMP_ALIGN
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| 151 | .SwapToXXhInAL:
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| 152 | mov dl, al
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| 153 | ret
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| 154 |
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| 155 |
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| 156 | ;--------------------------------------------------------------------
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| 157 | ; Resets drive swapping variables to defaults (no swapping).
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| 158 | ;
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| 159 | ; DriveXlate_Reset
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| 160 | ; Parameters:
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| 161 | ; DS: RAMVARS segment
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| 162 | ; Returns:
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| 163 | ; Nothing
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| 164 | ; Corrupts registers:
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| 165 | ; AX
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| 166 | ;--------------------------------------------------------------------
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| 167 | ALIGN JUMP_ALIGN
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| 168 | DriveXlate_Reset:
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| 169 | mov WORD [RAMVARS.xlateVars], 8000h ; .bFDSwap and .bHDSwap
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| 170 | mov BYTE [RAMVARS.xlateVars+XLATEVARS.bRecurCnt], 0
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| 171 | ret
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| 172 |
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| 173 |
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| 174 | ;--------------------------------------------------------------------
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| 175 | ; Stores drive to be swapped.
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| 176 | ;
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| 177 | ; DriveXlate_SetDriveToSwap
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| 178 | ; Parameters:
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| 179 | ; DL: Drive to swap to 00h or 80h
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| 180 | ; DS: RAMVARS segment
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| 181 | ; Returns:
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| 182 | ; Nothing
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| 183 | ; Corrupts registers:
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| 184 | ; Nothing
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| 185 | ;--------------------------------------------------------------------
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| 186 | ALIGN JUMP_ALIGN
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| 187 | DriveXlate_SetDriveToSwap:
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| 188 | test dl, 80h ; Floppy drive?
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| 189 | jnz SHORT DriveXlate_SetHardDiskToSwap
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| 190 | ; Fall to DriveXlate_SetFloppyDriveToSwap
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| 191 |
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| 192 | ;--------------------------------------------------------------------
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| 193 | ; Stores floppy drive to be swapped.
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| 194 | ;
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| 195 | ; DriveXlate_SetFloppyDriveToSwap
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| 196 | ; Parameters:
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| 197 | ; DL: Drive to swap to 00h
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| 198 | ; DS: RAMVARS segment
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| 199 | ; Returns:
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| 200 | ; Nothing
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| 201 | ; Corrupts registers:
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| 202 | ; Nothing
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| 203 | ;--------------------------------------------------------------------
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| 204 | ALIGN JUMP_ALIGN
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| 205 | DriveXlate_SetFloppyDriveToSwap:
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| 206 | mov [RAMVARS.xlateVars+XLATEVARS.bFDSwap], dl
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| 207 | ret
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| 208 |
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| 209 | ;--------------------------------------------------------------------
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| 210 | ; Stores hard disk to be swapped.
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| 211 | ;
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| 212 | ; DriveXlate_SetHardDiskToSwap
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| 213 | ; Parameters:
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| 214 | ; DL: Drive to swap to 80h
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| 215 | ; DS: RAMVARS segment
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| 216 | ; Returns:
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| 217 | ; Nothing
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| 218 | ; Corrupts registers:
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| 219 | ; Nothing
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| 220 | ;--------------------------------------------------------------------
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| 221 | ALIGN JUMP_ALIGN
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| 222 | DriveXlate_SetHardDiskToSwap:
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| 223 | mov [RAMVARS.xlateVars+XLATEVARS.bHDSwap], dl
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| 224 | ret
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| 225 |
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| 226 |
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| 227 | ;--------------------------------------------------------------------
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| 228 | ; Checks if INT 13h function returns some value in DL
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| 229 | ; (other than the drive number that was also parameter).
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| 230 | ;
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| 231 | ; DriveXlate_DoesFunctionReturnSomethingInDL
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| 232 | ; Parameters:
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| 233 | ; AH: INT 13h BIOS Function
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| 234 | ; DL: Drive number
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| 235 | ; Returns:
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| 236 | ; CF: Set if something is returned in DL
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| 237 | ; Cleared if only drive number parameter is returned in DL
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| 238 | ; Corrupts registers:
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| 239 | ; Nothing
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| 240 | ;--------------------------------------------------------------------
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| 241 | ALIGN JUMP_ALIGN
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| 242 | DriveXlate_DoesFunctionReturnSomethingInDL:
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| 243 | cmp ah, 08h ; AH=08h, Read Disk Drive Parameters?
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| 244 | je SHORT DriveXlate_FunctionReturnsSomethingInDL
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| 245 | test dl, 80h
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| 246 | jz SHORT DriveXlate_DoesFloppyFunctionReturnSomethingInDL
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| 247 | ; Fall to DriveXlate_DoesHardDiskFunctionReturnSomethingInDL
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| 248 |
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| 249 | ;--------------------------------------------------------------------
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| 250 | ; Checks if INT 13h hard disk or floppy drive function returns some
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| 251 | ; value in DL other than the drive number that was also parameter).
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| 252 | ; Some functions return different values for hard disks and floppy drives.
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| 253 | ;
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| 254 | ; DriveXlate_DoesHardDiskFunctionReturnSomethingInDL
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| 255 | ; DriveXlate_DoesFloppyFunctionReturnSomethingInDL
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| 256 | ; Parameters:
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| 257 | ; AH: INT 13h BIOS Function
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| 258 | ; DL: Hard Disk number
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| 259 | ; Returns:
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| 260 | ; CF: Set if something is returned in DL
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| 261 | ; Cleared if only drive number parameter is returned in DL
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| 262 | ; Corrupts registers:
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| 263 | ; Nothing
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| 264 | ;--------------------------------------------------------------------
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| 265 | ; ALIGN JUMP_ALIGN
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| 266 | DriveXlate_DoesHardDiskFunctionReturnSomethingInDL:
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| 267 | cmp ah, 15h ; AH=15h, Read Disk Drive Size?
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| 268 | je SHORT DriveXlate_FunctionReturnsSomethingInDL
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| 269 | DriveXlate_DoesFloppyFunctionReturnSomethingInDL:
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| 270 | clc
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| 271 | ret
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| 272 |
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| 273 | ALIGN JUMP_ALIGN
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| 274 | DriveXlate_FunctionReturnsSomethingInDL:
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| 275 | stc
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| 276 | ret
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