[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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| 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 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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| 12 | ; |
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| 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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| 16 | ; GNU General Public License for more details. |
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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| 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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| 34 | call DriveXlate_GetLetterForFirstHardDriveToAX |
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| 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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| 51 | %endif |
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| 52 | |
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| 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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| 66 | test dl, dl |
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| 67 | jns SHORT .GetDefaultFloppyDrive |
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| 68 | |
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| 69 | ; Store default hard drive to boot from |
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| 70 | call DriveXlate_GetLetterForFirstHardDriveToAX |
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| 71 | sub dl, 80h |
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| 72 | add dl, al |
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| 73 | stc |
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| 74 | ret |
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| 75 | |
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| 76 | .GetDefaultFloppyDrive: |
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| 77 | add dl, DEFAULT_FLOPPY_DRIVE_LETTER ; Clears CF |
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| 78 | ret |
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| 79 | |
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| 80 | |
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| 81 | ;-------------------------------------------------------------------- |
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| 82 | ; Returns letter for first hard disk. Usually it will be 'C' but it |
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| 83 | ; can be higher if more than two floppy drives are found. |
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| 84 | ; |
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| 85 | ; DriveXlate_GetLetterForFirstHardDriveToAX |
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| 86 | ; Parameters: |
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| 87 | ; DS: RAMVARS segment |
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| 88 | ; Returns: |
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| 89 | ; AX: Upper case letter for first hard disk |
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| 90 | ; Corrupts registers: |
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| 91 | ; Nothing |
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| 92 | ;-------------------------------------------------------------------- |
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| 93 | DriveXlate_GetLetterForFirstHardDriveToAX: |
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| 94 | call FloppyDrive_GetCountToAX |
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| 95 | add al, DEFAULT_FLOPPY_DRIVE_LETTER |
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| 96 | MAX_U al, DEFAULT_HARD_DRIVE_LETTER |
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| 97 | ret |
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| 98 | |
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| 99 | |
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| 100 | ;-------------------------------------------------------------------- |
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[395] | 101 | ; DriveXlate_ToOrBack |
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| 102 | ; Parameters: |
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| 103 | ; DL: Drive number to be possibly translated |
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| 104 | ; DS: RAMVARS segment |
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| 105 | ; Returns: |
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| 106 | ; DL: Translated drive number |
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| 107 | ; Corrupts registers: |
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| 108 | ; DI |
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| 109 | ;-------------------------------------------------------------------- |
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| 110 | ALIGN JUMP_ALIGN |
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| 111 | DriveXlate_ToOrBack: |
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| 112 | xchg di, ax ; Backup AX |
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| 113 | |
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| 114 | mov ah, 80h ; Assume hard disk |
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| 115 | mov al, [RAMVARS.xlateVars+XLATEVARS.bHDSwap] |
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| 116 | test dl, ah ; Hard disk? |
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| 117 | jnz SHORT .SwapDrive ; If so, jump to swap |
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| 118 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFDSwap] |
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| 119 | cbw |
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| 120 | |
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| 121 | ALIGN JUMP_ALIGN |
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| 122 | .SwapDrive: |
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| 123 | cmp ah, dl ; Swap DL from 00h/80h to xxh? |
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| 124 | je SHORT .SwapToXXhInAL |
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| 125 | cmp al, dl ; Swap DL from xxh to 00h/80h? |
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| 126 | jne SHORT .RestoreAXandReturn |
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| 127 | mov al, ah |
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| 128 | ALIGN JUMP_ALIGN |
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| 129 | .SwapToXXhInAL: |
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| 130 | mov dl, al |
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| 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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| 146 | ; Nothing |
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| 147 | ;-------------------------------------------------------------------- |
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| 148 | DriveXlate_Reset: |
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| 149 | mov WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap], 8000h |
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| 150 | ret |
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| 151 | |
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| 152 | |
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| 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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| 158 | ; DL: Drive to swap to 00h or 80h |
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| 159 | ; DS: RAMVARS segment |
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| 160 | ; Returns: |
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| 161 | ; Nothing |
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| 162 | ; Corrupts registers: |
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| 163 | ; Nothing |
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| 164 | ;-------------------------------------------------------------------- |
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| 165 | DriveXlate_SetDriveToSwap: |
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| 166 | test dl, dl ; Floppy drive? |
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[397] | 167 | js SHORT .SetHardDriveToSwap |
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| 168 | |
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| 169 | ; Set Floppy Drive to swap |
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[395] | 170 | mov [RAMVARS.xlateVars+XLATEVARS.bFDSwap], dl |
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| 171 | ret |
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[397] | 172 | |
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| 173 | .SetHardDriveToSwap: |
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[395] | 174 | mov [RAMVARS.xlateVars+XLATEVARS.bHDSwap], dl |
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| 175 | ret |
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