[395] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Functions for swapping drive letters. |
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| 3 | |
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| 4 | ; |
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[505] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[395] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[505] | 12 | ; |
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[395] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[505] | 16 | ; GNU General Public License for more details. |
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[395] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[505] | 18 | ; |
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[395] | 19 | |
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| 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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[492] | 24 | ; DriveXlate_ConvertDriveLetterInDLtoDriveNumber |
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| 25 | ; Parameters: |
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| 26 | ; DS: RAMVARS segment |
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| 27 | ; DL: Drive letter ('A'...) |
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| 28 | ; Returns: |
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| 29 | ; DL: Drive number (0xh for Floppy Drives, 8xh for Hard Drives) |
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| 30 | ; Corrupts registers: |
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| 31 | ; AX |
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| 32 | ;-------------------------------------------------------------------- |
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| 33 | DriveXlate_ConvertDriveLetterInDLtoDriveNumber: |
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[547] | 34 | call BootVars_GetLetterForFirstHardDriveToAX |
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[492] | 35 | cmp dl, al |
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| 36 | jb SHORT .ConvertLetterInDLtoFloppyDriveNumber |
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| 37 | |
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| 38 | ; Convert letter in DL to Hard Drive number |
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| 39 | sub dl, al |
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| 40 | or dl, 80h |
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| 41 | ret |
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| 42 | |
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| 43 | .ConvertLetterInDLtoFloppyDriveNumber: |
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| 44 | sub dl, DEFAULT_FLOPPY_DRIVE_LETTER |
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| 45 | ret |
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| 46 | |
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| 47 | %ifdef MODULE_HOTKEY |
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| 48 | %if HotkeyBar_FallThroughTo_DriveXlate_ConvertDriveLetterInDLtoDriveNumber <> DriveXlate_ConvertDriveLetterInDLtoDriveNumber |
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| 49 | %error "DriveXlate_ConvertDriveLetterInDLtoDriveNumber must be at the top of DriveXlate.asm, and that file must immediately follow HotKeys.asm" |
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| 50 | %endif |
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[505] | 51 | %endif |
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| 52 | |
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[492] | 53 | ;-------------------------------------------------------------------- |
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| 54 | ; DriveXlate_ConvertDriveNumberFromDLtoDriveLetter |
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| 55 | ; Parameters: |
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| 56 | ; DL: Drive number (0xh for Floppy Drives, 8xh for Hard Drives) |
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| 57 | ; DS: RAMVARS Segment |
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| 58 | ; Returns: |
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| 59 | ; DL: Drive letter ('A'...) |
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| 60 | ; CF: Set if Hard Drive |
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| 61 | ; Clear if Floppy Drive |
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| 62 | ; Corrupts registers: |
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| 63 | ; AX |
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| 64 | ;-------------------------------------------------------------------- |
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| 65 | DriveXlate_ConvertDriveNumberFromDLtoDriveLetter: |
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[505] | 66 | xor dl, 80h |
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| 67 | js SHORT .GetDefaultFloppyDrive |
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[492] | 68 | |
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| 69 | ; Store default hard drive to boot from |
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[547] | 70 | call BootVars_GetLetterForFirstHardDriveToAX |
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[492] | 71 | add dl, al |
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| 72 | stc |
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| 73 | ret |
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| 74 | |
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| 75 | .GetDefaultFloppyDrive: |
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[505] | 76 | sub dl, 80h - DEFAULT_FLOPPY_DRIVE_LETTER ; Clears CF |
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[492] | 77 | ret |
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| 78 | |
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| 79 | |
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| 80 | ;-------------------------------------------------------------------- |
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[395] | 81 | ; DriveXlate_ToOrBack |
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| 82 | ; Parameters: |
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| 83 | ; DL: Drive number to be possibly translated |
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| 84 | ; DS: RAMVARS segment |
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| 85 | ; Returns: |
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| 86 | ; DL: Translated drive number |
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| 87 | ; Corrupts registers: |
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| 88 | ; DI |
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| 89 | ;-------------------------------------------------------------------- |
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| 90 | ALIGN JUMP_ALIGN |
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| 91 | DriveXlate_ToOrBack: |
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| 92 | xchg di, ax ; Backup AX |
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| 93 | |
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| 94 | mov ah, 80h ; Assume hard disk |
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| 95 | mov al, [RAMVARS.xlateVars+XLATEVARS.bHDSwap] |
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| 96 | test dl, ah ; Hard disk? |
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| 97 | jnz SHORT .SwapDrive ; If so, jump to swap |
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[550] | 98 | |
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[395] | 99 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFDSwap] |
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| 100 | cbw |
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| 101 | |
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| 102 | ALIGN JUMP_ALIGN |
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| 103 | .SwapDrive: |
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| 104 | cmp ah, dl ; Swap DL from 00h/80h to xxh? |
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| 105 | je SHORT .SwapToXXhInAL |
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| 106 | cmp al, dl ; Swap DL from xxh to 00h/80h? |
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| 107 | jne SHORT .RestoreAXandReturn |
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| 108 | mov al, ah |
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[550] | 109 | |
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[395] | 110 | ALIGN JUMP_ALIGN |
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| 111 | .SwapToXXhInAL: |
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| 112 | mov dl, al |
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[550] | 113 | |
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| 114 | %ifdef MODULE_COMPATIBLE_TABLES |
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| 115 | cmp al, 81h |
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| 116 | jne SHORT .RestoreAXandReturn |
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| 117 | |
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| 118 | ; Since swapping drive 80h <=> 81h, we need to swap |
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| 119 | ; DPT pointers in interrupt vectors 41h and 46h. |
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| 120 | push ds |
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| 121 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 122 | mov ax, [HD0_DPT_POINTER_41h*4] |
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| 123 | xchg [HD1_DPT_POINTER_46h*4], ax |
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| 124 | mov [HD0_DPT_POINTER_41h*4], ax |
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| 125 | mov ax, [HD0_DPT_POINTER_41h*4+2] |
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| 126 | xchg [HD1_DPT_POINTER_46h*4+2], ax |
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| 127 | mov [HD0_DPT_POINTER_41h*4+2], ax |
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| 128 | pop ds |
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| 129 | %endif ; MODULE_COMPATIBLE_TABLES |
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| 130 | |
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[395] | 131 | ALIGN JUMP_ALIGN |
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| 132 | .RestoreAXandReturn: |
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| 133 | xchg ax, di ; Restore AX |
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| 134 | ret |
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| 135 | |
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| 136 | |
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| 137 | ;-------------------------------------------------------------------- |
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| 138 | ; Resets drive swapping variables to defaults (no swapping). |
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| 139 | ; |
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| 140 | ; DriveXlate_Reset |
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| 141 | ; Parameters: |
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| 142 | ; DS: RAMVARS segment |
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| 143 | ; Returns: |
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| 144 | ; Nothing |
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| 145 | ; Corrupts registers: |
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[528] | 146 | ; Nothing |
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[395] | 147 | ;-------------------------------------------------------------------- |
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| 148 | DriveXlate_Reset: |
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[528] | 149 | mov WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap], 8000h |
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| 150 | ret |
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[395] | 151 | |
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[528] | 152 | |
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[395] | 153 | ;-------------------------------------------------------------------- |
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| 154 | ; Stores drive to be swapped. |
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| 155 | ; |
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| 156 | ; DriveXlate_SetDriveToSwap |
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| 157 | ; Parameters: |
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[528] | 158 | ; DL: Hard Drive to swap to first Hard Drive |
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| 159 | ; Floppy Drive to swap to first Floppy Drive |
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[395] | 160 | ; DS: RAMVARS segment |
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| 161 | ; Returns: |
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| 162 | ; Nothing |
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| 163 | ; Corrupts registers: |
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[528] | 164 | ; Nothing |
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[395] | 165 | ;-------------------------------------------------------------------- |
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| 166 | DriveXlate_SetDriveToSwap: |
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| 167 | test dl, dl ; Floppy drive? |
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[397] | 168 | js SHORT .SetHardDriveToSwap |
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[528] | 169 | |
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| 170 | ; Set Floppy Drive to swap |
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| 171 | mov [RAMVARS.xlateVars+XLATEVARS.bFDSwap], dl |
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| 172 | ret |
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| 173 | |
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[505] | 174 | .SetHardDriveToSwap: |
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[528] | 175 | mov [RAMVARS.xlateVars+XLATEVARS.bHDSwap], dl |
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[395] | 176 | ret |
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