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, 2011-2013 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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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 | xor dl, 80h |
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67 | js 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 | 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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76 | sub dl, 80h - DEFAULT_FLOPPY_DRIVE_LETTER ; Clears CF |
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77 | ret |
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78 | |
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79 | |
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80 | ;-------------------------------------------------------------------- |
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81 | ; Returns letter for first hard disk. Usually it will be 'C' but it |
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82 | ; can be higher if more than two floppy drives are found. |
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83 | ; |
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84 | ; DriveXlate_GetLetterForFirstHardDriveToAX |
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85 | ; Parameters: |
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86 | ; DS: RAMVARS segment |
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87 | ; Returns: |
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88 | ; AX: Upper case letter for first hard disk |
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89 | ; Corrupts registers: |
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90 | ; Nothing |
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91 | ;-------------------------------------------------------------------- |
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92 | DriveXlate_GetLetterForFirstHardDriveToAX: |
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93 | call FloppyDrive_GetCountToAX |
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94 | add al, DEFAULT_FLOPPY_DRIVE_LETTER |
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95 | MAX_U al, DEFAULT_HARD_DRIVE_LETTER |
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96 | ret |
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97 | |
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98 | |
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99 | ;-------------------------------------------------------------------- |
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100 | ; DriveXlate_ToOrBack |
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101 | ; Parameters: |
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102 | ; DL: Drive number to be possibly translated |
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103 | ; DS: RAMVARS segment |
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104 | ; Returns: |
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105 | ; DL: Translated drive number |
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106 | ; Corrupts registers: |
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107 | ; DI |
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108 | ;-------------------------------------------------------------------- |
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109 | ALIGN JUMP_ALIGN |
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110 | DriveXlate_ToOrBack: |
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111 | xchg di, ax ; Backup AX |
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112 | |
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113 | mov ah, 80h ; Assume hard disk |
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114 | mov al, [RAMVARS.xlateVars+XLATEVARS.bHDSwap] |
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115 | test dl, ah ; Hard disk? |
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116 | jnz SHORT .SwapDrive ; If so, jump to swap |
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117 | mov al, [RAMVARS.xlateVars+XLATEVARS.bFDSwap] |
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118 | cbw |
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119 | |
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120 | ALIGN JUMP_ALIGN |
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121 | .SwapDrive: |
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122 | cmp ah, dl ; Swap DL from 00h/80h to xxh? |
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123 | je SHORT .SwapToXXhInAL |
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124 | cmp al, dl ; Swap DL from xxh to 00h/80h? |
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125 | jne SHORT .RestoreAXandReturn |
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126 | mov al, ah |
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127 | ALIGN JUMP_ALIGN |
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128 | .SwapToXXhInAL: |
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129 | mov dl, al |
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130 | ALIGN JUMP_ALIGN |
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131 | .RestoreAXandReturn: |
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132 | xchg ax, di ; Restore AX |
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133 | ret |
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134 | |
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135 | |
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136 | ;-------------------------------------------------------------------- |
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137 | ; Resets drive swapping variables to defaults (no swapping). |
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138 | ; |
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139 | ; DriveXlate_Reset |
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140 | ; Parameters: |
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141 | ; DS: RAMVARS segment |
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142 | ; Returns: |
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143 | ; Nothing |
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144 | ; Corrupts registers: |
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145 | ; AX, DI, DL |
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146 | ;-------------------------------------------------------------------- |
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147 | DriveXlate_Reset: |
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148 | xor dl, dl ; no translation for a floppy |
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149 | ;; fall through to DriveXlate_SetDriveToSwap |
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150 | |
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151 | ;-------------------------------------------------------------------- |
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152 | ; Stores drive to be swapped. |
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153 | ; |
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154 | ; DriveXlate_SetDriveToSwap |
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155 | ; Parameters: |
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156 | ; DL: Drive to swap to 00h or 80h |
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157 | ; DS: RAMVARS segment |
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158 | ; Returns: |
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159 | ; Nothing |
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160 | ; Corrupts registers: |
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161 | ; AX, DI |
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162 | ;-------------------------------------------------------------------- |
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163 | DriveXlate_SetDriveToSwap: |
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164 | mov ax, 8000h ; Default mapping (no translation) |
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165 | test dl, dl ; Floppy drive? |
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166 | js SHORT .SetHardDriveToSwap |
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167 | mov al, dl ; Store floppy translation |
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168 | SKIP2B di |
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169 | .SetHardDriveToSwap: |
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170 | mov ah, dl ; Store HD translation |
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171 | mov WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap], ax |
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172 | ret |
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