1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Hotkey Bar related functions. |
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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 | ;-------------------------------------------------------------------- |
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25 | ; Handler for INT 1Ch User Timer Tick. |
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26 | ; Reads key presses and draws hotkey bar. |
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27 | ; |
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28 | ; HotkeyBar_TimerTickHandler |
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29 | ; Parameters: |
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30 | ; Nothing |
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31 | ; Returns: |
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32 | ; Nothing |
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33 | ; Corrupts registers: |
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34 | ; Nothing |
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35 | ;-------------------------------------------------------------------- |
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36 | ALIGN JUMP_ALIGN |
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37 | HotkeyBar_TimerTickHandler: |
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38 | push es |
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39 | %ifndef USE_186 ; LOAD_BDA_SEGMENT_TO will corrupt AX on 8088/8086 |
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40 | push ax |
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41 | %endif |
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42 | |
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43 | ;!!! Keep interrupts disabled so there won't be another |
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44 | ; timer tick call before we are ready |
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45 | |
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46 | LOAD_BDA_SEGMENT_TO es, ax |
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47 | |
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48 | ; Call previous handler |
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49 | pushf |
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50 | call FAR [es:BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler] |
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51 | |
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52 | ; Update Hotkeybar (process key input and draw) every fourth tick |
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53 | test BYTE [es:BDA.dwTimerTicks], 11b |
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54 | jnz SHORT .ReturnFromHandler |
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55 | |
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56 | push ds |
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57 | %ifdef USE_186 |
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58 | pusha |
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59 | %else |
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60 | push di |
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61 | push si |
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62 | push dx |
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63 | push cx |
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64 | %endif |
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65 | call RamVars_GetSegmentToDS |
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66 | call HotkeyBar_UpdateDuringDriveDetection |
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67 | %ifdef USE_186 |
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68 | popa |
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69 | %else |
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70 | pop cx |
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71 | pop dx |
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72 | pop si |
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73 | pop di |
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74 | %endif |
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75 | pop ds |
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76 | |
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77 | .ReturnFromHandler: |
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78 | %ifndef USE_186 |
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79 | pop ax |
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80 | %endif |
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81 | pop es |
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82 | iret |
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83 | |
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84 | |
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85 | ;-------------------------------------------------------------------- |
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86 | ; Scans key presses and draws any hotkey changes. |
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87 | ; |
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88 | ; HotkeyBar_UpdateDuringDriveDetection |
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89 | ; Parameters: |
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90 | ; DS: RAMVARS segment |
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91 | ; ES: BDA segment (zero) |
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92 | ; Returns: |
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93 | ; Nothing |
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94 | ; Corrupts registers: |
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95 | ; AX, CX, DX, SI, DI |
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96 | ;-------------------------------------------------------------------- |
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97 | HotkeyBar_UpdateDuringDriveDetection: |
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98 | call ScanHotkeysFromKeyBufferAndStoreToBootvars |
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99 | |
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100 | ; If ESC pressed, abort detection by forcing timeout |
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101 | cmp al, ESC_SCANCODE |
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102 | jne SHORT .ContinueDrawing |
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103 | mov BYTE [RAMVARS.bTimeoutTicksLeft], 0 |
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104 | .ContinueDrawing: |
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105 | ; Fall to HotkeyBar_DrawToTopOfScreen |
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106 | |
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107 | |
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108 | ;-------------------------------------------------------------------- |
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109 | ; HotkeyBar_DrawToTopOfScreen |
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110 | ; Parameters: |
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111 | ; DS: RAMVARS segment |
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112 | ; ES: BDA segment (zero) |
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113 | ; Returns: |
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114 | ; Nothing |
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115 | ; Corrupts registers: |
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116 | ; AX, CX, DX, SI, DI |
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117 | ;-------------------------------------------------------------------- |
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118 | HotkeyBar_DrawToTopOfScreen: |
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119 | ; Store current screen coordinates to stack |
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120 | ; (to be restored when Hotkey Bar is rendered) |
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121 | CALL_DISPLAY_LIBRARY GetSoftwareCoordinatesToAX |
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122 | push ax |
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123 | |
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124 | ; Move cursor to top left corner (0, 0) |
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125 | xor ax, ax |
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126 | call HotkeyBar_SetCursorCoordinatesFromAX |
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127 | ; Fall to .PrintFloppyDriveHotkeys |
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128 | |
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129 | ;-------------------------------------------------------------------- |
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130 | ; .PrintFloppyDriveHotkeys |
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131 | ; Parameters: |
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132 | ; DS: RAMVARS segment |
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133 | ; ES: BDA segment (zero) |
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134 | ; Returns: |
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135 | ; Nothing |
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136 | ; Corrupts registers: |
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137 | ; AX, CX, DX, SI, DI |
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138 | ;-------------------------------------------------------------------- |
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139 | .PrintFloppyDriveHotkeys: |
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140 | call FloppyDrive_GetCountToAX |
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141 | xchg cx, ax ; Any Floppy Drives? |
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142 | jcxz .SkipFloppyDriveHotkeys |
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143 | |
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144 | mov ax, (ANGLE_QUOTE_RIGHT << 8) | DEFAULT_FLOPPY_DRIVE_LETTER |
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145 | mov cl, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFddLetter] |
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146 | mov di, g_szFDD |
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147 | |
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148 | ; Clear CH if floppy drive is selected for boot |
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149 | %if 0 ; Not needed until more flags added |
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150 | mov ch, FLG_HOTKEY_HD_FIRST |
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151 | and ch, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags] |
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152 | %else |
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153 | mov ch, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags] |
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154 | %endif |
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155 | call FormatDriveHotkeyString |
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156 | |
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157 | .SkipFloppyDriveHotkeys: |
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158 | ; Fall to .PrintHardDriveHotkeys |
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159 | |
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160 | ;-------------------------------------------------------------------- |
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161 | ; .PrintHardDriveHotkeys |
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162 | ; Parameters: |
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163 | ; DS: RAMVARS segment |
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164 | ; ES: BDA segment (zero) |
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165 | ; Returns: |
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166 | ; Nothing |
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167 | ; Corrupts registers: |
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168 | ; AX, CX, DX, SI, DI |
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169 | ;-------------------------------------------------------------------- |
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170 | call BootVars_GetLetterForFirstHardDriveToAX |
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171 | mov ah, ANGLE_QUOTE_RIGHT |
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172 | mov cx, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wHddLetterAndFlags] ; Letter to CL, flags to CH |
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173 | ;and ch, FLG_HOTKEY_HD_FIRST ; Not needed until more flags added |
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174 | xor ch, FLG_HOTKEY_HD_FIRST ; Clear CH if HD is selected for boot, set otherwise |
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175 | mov di, g_szHDD |
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176 | call FormatDriveHotkeyString |
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177 | ; Fall to .PrintBootMenuHotkey |
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178 | |
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179 | ;-------------------------------------------------------------------- |
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180 | ; .PrintBootMenuHotkey |
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181 | ; Parameters: |
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182 | ; ES: BDA segment (zero) |
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183 | ; Returns: |
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184 | ; Nothing |
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185 | ; Corrupts registers: |
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186 | ; AX, CX, DX, SI, DI |
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187 | ;-------------------------------------------------------------------- |
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188 | .PrintBootMenuHotkey: |
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189 | %ifdef MODULE_BOOT_MENU |
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190 | mov ax, BOOT_MENU_HOTKEY_SCANCODE | ('2' << 8) |
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191 | mov di, g_szBootMenu |
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192 | call FormatFunctionHotkeyString |
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193 | %endif |
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194 | ; Fall to .PrintComDetectHotkey |
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195 | |
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196 | ;-------------------------------------------------------------------- |
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197 | ; .PrintComDetectHotkey |
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198 | ; Parameters: |
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199 | ; ES: BDA segment (zero) |
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200 | ; Returns: |
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201 | ; Nothing |
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202 | ; Corrupts registers: |
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203 | ; AX, CX, DX, SI, DI |
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204 | ;-------------------------------------------------------------------- |
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205 | .PrintComDetectHotkey: |
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206 | %ifdef MODULE_SERIAL |
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207 | mov ax, COM_DETECT_HOTKEY_SCANCODE | ('6' << 8) |
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208 | mov di, g_szHotComDetect |
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209 | call FormatFunctionHotkeyString |
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210 | %endif |
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211 | ; Fall to .PrintRomBootHotkey |
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212 | |
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213 | ;-------------------------------------------------------------------- |
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214 | ; .PrintRomBootHotkey |
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215 | ; Parameters: |
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216 | ; ES: BDA segment (zero) |
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217 | ; Returns: |
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218 | ; Nothing |
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219 | ; Corrupts registers: |
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220 | ; AX, CX, DX, SI, DI |
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221 | ;-------------------------------------------------------------------- |
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222 | .PrintRomBootHotkey: |
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223 | mov ax, ROM_BOOT_HOTKEY_SCANCODE | ('8' << 8) |
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224 | mov di, g_szRomBoot |
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225 | call FormatFunctionHotkeyString |
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226 | ; Fall to .EndHotkeyBarRendering |
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227 | |
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228 | ;-------------------------------------------------------------------- |
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229 | ; .EndHotkeyBarRendering |
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230 | ; Parameters: |
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231 | ; Stack: Screen coordinates before drawing Hotkey Bar |
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232 | ; Returns: |
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233 | ; Nothing |
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234 | ; Corrupts registers: |
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235 | ; AX, CX, DI |
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236 | ;-------------------------------------------------------------------- |
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237 | .EndHotkeyBarRendering: |
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238 | ; Clear the rest of the top row |
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239 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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240 | eMOVZX cx, al |
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241 | CALL_DISPLAY_LIBRARY GetSoftwareCoordinatesToAX |
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242 | sub cl, al |
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243 | mov al, ' ' |
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244 | CALL_DISPLAY_LIBRARY PrintRepeatedCharacterFromALwithCountInCX |
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245 | |
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246 | ; Restore the saved coordinates from stack |
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247 | pop ax |
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248 | ; Fall to HotkeyBar_SetCursorCoordinatesFromAX |
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249 | |
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250 | |
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251 | ;-------------------------------------------------------------------- |
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252 | ; HotkeyBar_SetCursorCoordinatesFromAX |
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253 | ; Parameters: |
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254 | ; Nothing |
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255 | ; Returns: |
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256 | ; Nothing |
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257 | ; Corrupts registers: |
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258 | ; AX, DI |
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259 | ;-------------------------------------------------------------------- |
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260 | HotkeyBar_SetCursorCoordinatesFromAX: |
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261 | JMP_DISPLAY_LIBRARY SetCursorCoordinatesFromAX |
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262 | |
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263 | |
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264 | ;-------------------------------------------------------------------- |
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265 | ; FormatDriveHotkeyString |
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266 | ; Parameters: |
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267 | ; CH: Zero if letter in CL is selected for boot |
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268 | ; CL: Drive letter hotkey from BOOTVARS |
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269 | ; AL: First character for drive key string |
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270 | ; AH: Second character for drive key string (ANGLE_QUOTE_RIGHT) |
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271 | ; SI: Offset to hotkey description string |
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272 | ; ES: BDA segment (zero) |
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273 | ; Returns: |
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274 | ; Nothing |
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275 | ; Corrupts registers: |
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276 | ; AX, CX, DX, SI, DI |
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277 | ;-------------------------------------------------------------------- |
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278 | FormatDriveHotkeyString: |
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279 | ; Invalid scancodes are filtered on HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX |
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280 | ; so here we have either drive letter or function key pressed. If latter, draw |
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281 | ; drive letters as unselected |
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282 | cmp BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode], FIRST_FUNCTION_KEY_SCANCODE |
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283 | jae SHORT GetNonSelectedHotkeyDescriptionAttributeToDX |
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284 | |
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285 | ; Drive selected to boot from? |
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286 | test ch, ch |
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287 | jnz SHORT GetNonSelectedHotkeyDescriptionAttributeToDX |
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288 | jmp SHORT GetSelectedHotkeyDescriptionAttributeToDX |
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289 | |
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290 | |
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291 | ;-------------------------------------------------------------------- |
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292 | ; FormatFunctionHotkeyString |
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293 | ; Parameters: |
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294 | ; AL: Scancode of function key, to know which if any to show as selected |
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295 | ; Later replaced with an 'F' for the call to the output routine |
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296 | ; AH: Second character for drive key string |
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297 | ; SI: Offset to hotkey description string |
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298 | ; ES: BDA segment (zero) |
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299 | ; Returns: |
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300 | ; Nothing |
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301 | ; Corrupts registers: |
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302 | ; AX, CX, DX, SI, DI |
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303 | ;-------------------------------------------------------------------- |
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304 | FormatFunctionHotkeyString: |
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305 | xor cx, cx ; Null character, eaten in output routines |
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306 | |
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307 | cmp [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode], al |
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308 | mov al, 'F' ; Replace scancode with character for output |
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309 | |
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310 | %ifdef MODULE_BOOT_MENU |
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311 | |
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312 | GetSelectedHotkeyDescriptionAttributeToDX: |
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313 | mov si, ATTRIBUTE_CHARS.cHighlightedItem ; Selected hotkey |
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314 | je SHORT GetDescriptionAttributeToDX ; From compare with bScancode above and from FormatDriveHotkeyString |
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315 | |
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316 | GetNonSelectedHotkeyDescriptionAttributeToDX: |
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317 | mov si, ATTRIBUTE_CHARS.cItem ; Unselected hotkey |
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318 | |
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319 | ; Display Library should not be called like this |
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320 | GetDescriptionAttributeToDX: |
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321 | xchg dx, ax |
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322 | call MenuAttribute_GetToAXfromTypeInSI |
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323 | xchg dx, ax ; DX = Description attribute |
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324 | ;; fall through to PushHotkeyParamsAndFormat |
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325 | |
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326 | |
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327 | %else ; if no MODULE_BOOT_MENU - No boot menu so use simpler attributes |
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328 | |
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329 | GetSelectedHotkeyDescriptionAttributeToDX: |
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330 | mov dx, (COLOR_ATTRIBUTE(COLOR_YELLOW, COLOR_CYAN) << 8) | MONO_REVERSE_BLINK |
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331 | je SHORT SelectAttributeFromDHorDLbasedOnVideoMode ; From compare with bScancode above and from FormatDriveHotkeyString |
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332 | |
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333 | GetNonSelectedHotkeyDescriptionAttributeToDX: |
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334 | mov dx, (COLOR_ATTRIBUTE(COLOR_BLACK, COLOR_CYAN) << 8) | MONO_REVERSE |
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335 | |
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336 | SelectAttributeFromDHorDLbasedOnVideoMode: |
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337 | mov ch, [es:BDA.bVidMode] ; We only need to preserve CL |
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338 | shr ch, 1 |
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339 | jnc SHORT .AttributeLoadedToDL ; Black & White modes |
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340 | shr ch, 1 |
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341 | jnz SHORT .AttributeLoadedToDL ; MDA |
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342 | mov dl, dh |
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343 | .AttributeLoadedToDL: |
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344 | ;; fall through to PushHotkeyParamsAndFormat |
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345 | |
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346 | %endif ; MODULE_BOOT_MENU |
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347 | |
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348 | |
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349 | ;-------------------------------------------------------------------- |
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350 | ; PushHotkeyParamsAndFormat |
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351 | ; Parameters: |
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352 | ; AL: First character |
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353 | ; AH: Second character |
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354 | ; DX: Description Attribute |
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355 | ; CX: Description string parameter |
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356 | ; CS:DI: Description string |
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357 | ; Returns: |
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358 | ; Nothing |
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359 | ; Corrupts registers: |
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360 | ; AX, SI, DI |
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361 | ;-------------------------------------------------------------------- |
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362 | PushHotkeyParamsAndFormat: |
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363 | push bp |
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364 | mov bp, sp |
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365 | |
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366 | mov si, MONO_BRIGHT |
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367 | |
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368 | push si ; Key attribute |
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369 | push ax ; First Character |
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370 | mov al, ah |
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371 | push ax ; Second Character |
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372 | |
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373 | push dx ; Description attribute |
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374 | push di ; Description string |
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375 | push cx ; Description string parameter |
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376 | |
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377 | push si ; Key attribute for last space |
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378 | |
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379 | mov si, g_szHotkey |
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380 | jmp DetectPrint_FormatCSSIfromParamsInSSBP |
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381 | |
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382 | |
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383 | ;-------------------------------------------------------------------- |
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384 | ; HotkeyBar_StoreDefaultDriveLettersToHotkeyVars |
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385 | ; Parameters: |
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386 | ; ES: BDA Segment |
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387 | ; Returns: |
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388 | ; Nothing |
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389 | ; Corrupts registers: |
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390 | ; AX |
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391 | ;-------------------------------------------------------------------- |
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392 | HotkeyBar_StoreDefaultDriveLettersToHotkeyVars: |
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393 | call BootVars_GetLetterForFirstHardDriveToAX |
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394 | mov ah, DEFAULT_FLOPPY_DRIVE_LETTER |
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395 | xchg al, ah |
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396 | mov [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters], ax |
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397 | ret |
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398 | |
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399 | |
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400 | ;-------------------------------------------------------------------- |
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401 | ; HotkeyBar_InitializeVariables |
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402 | ; Parameters: |
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403 | ; DS: RAMVARS Segment |
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404 | ; ES: BDA Segment |
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405 | ; Returns: |
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406 | ; Nothing |
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407 | ; Corrupts registers: |
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408 | ; AX, CX, DX, DI |
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409 | ;-------------------------------------------------------------------- |
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410 | HotkeyBar_InitializeVariables: |
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411 | push ds |
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412 | push es |
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413 | pop ds |
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414 | |
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415 | ; Store system 1Ch Timer Tick handler and install our hotkeybar handler |
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416 | mov ax, [BIOS_USER_TIMER_TICK_INTERRUPT_1Ch*4] |
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417 | mov [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler], ax |
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418 | mov ax, [BIOS_USER_TIMER_TICK_INTERRUPT_1Ch*4+2] |
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419 | mov [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler+2], ax |
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420 | mov al, BIOS_USER_TIMER_TICK_INTERRUPT_1Ch |
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421 | mov si, HotkeyBar_TimerTickHandler |
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422 | call Interrupts_InstallHandlerToVectorInALFromCSSI |
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423 | |
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424 | ; Store time when hotkeybar is displayed |
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425 | ; (it will be displayed after initialization is complete) |
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426 | call TimerTicks_ReadFromBdaToAX |
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427 | mov [BOOTVARS.hotkeyVars+HOTKEYVARS.wTimeWhenDisplayed], ax |
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428 | |
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429 | pop ds |
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430 | |
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431 | ; Initialize HOTKEYVARS by storing default drives to boot from |
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432 | call HotkeyBar_StoreDefaultDriveLettersToHotkeyVars |
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433 | mov dl, [cs:ROMVARS.bBootDrv] |
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434 | ; Fall to HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL |
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435 | |
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436 | |
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437 | ;-------------------------------------------------------------------- |
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438 | ; HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL |
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439 | ; Parameters: |
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440 | ; DS: RAMVARS segment |
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441 | ; ES: BDA segment (zero) |
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442 | ; DL: Drive Number |
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443 | ; Returns: |
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444 | ; Nothing |
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445 | ; Corrupts registers: |
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446 | ; AX, CX, DL, DI |
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447 | ;-------------------------------------------------------------------- |
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448 | HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL: |
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449 | call DriveXlate_ConvertDriveNumberFromDLtoDriveLetter |
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450 | ; Fall to StoreHotkeyToBootvarsForDriveLetterInDL |
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451 | |
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452 | |
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453 | ;-------------------------------------------------------------------- |
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454 | ; StoreHotkeyToBootvarsForDriveLetterInDL |
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455 | ; Parameters: |
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456 | ; DS: RAMVARS segment |
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457 | ; ES: BDA segment (zero) |
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458 | ; DL: Drive Letter ('A'...) |
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459 | ; Returns: |
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460 | ; Nothing |
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461 | ; Corrupts registers: |
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462 | ; AX, CX, DI |
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463 | ;-------------------------------------------------------------------- |
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464 | StoreHotkeyToBootvarsForDriveLetterInDL: |
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465 | eMOVZX ax, dl |
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466 | or al, 32 ; Upper case drive letter to lower case keystroke |
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467 | jmp SHORT HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX |
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468 | |
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469 | |
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470 | ;-------------------------------------------------------------------- |
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471 | ; ScanHotkeysFromKeyBufferAndStoreToBootvars |
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472 | ; Parameters: |
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473 | ; DS: RAMVARS segment |
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474 | ; ES: BDA segment (zero) |
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475 | ; Returns: |
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476 | ; AL: Last scancode value |
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477 | ; Corrupts registers: |
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478 | ; AH, CX |
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479 | ;-------------------------------------------------------------------- |
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480 | ScanHotkeysFromKeyBufferAndStoreToBootvars: |
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481 | call Keyboard_GetKeystrokeToAX |
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482 | jz SHORT NoHotkeyToProcess |
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483 | |
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484 | ; Prepare to read another key from buffer |
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485 | ePUSH_T cx, ScanHotkeysFromKeyBufferAndStoreToBootvars |
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486 | ; Fall to HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX |
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487 | |
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488 | |
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489 | ;-------------------------------------------------------------------- |
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490 | ; HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX |
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491 | ; Parameters: |
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492 | ; AL: Hotkey ASCII code |
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493 | ; AH: Hotkey Scancode |
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494 | ; DS: RAMVARS segment |
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495 | ; ES: BDA segment (zero) |
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496 | ; Returns: |
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497 | ; AL: Last scancode seen |
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498 | ; CF: Set if valid hotkey in AL |
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499 | ; Clear if scancode in AL is not for any hotkey |
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500 | ; Corrupts registers: |
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501 | ; AH, CX, DI |
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502 | ;-------------------------------------------------------------------- |
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503 | HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX: |
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504 | mov di, BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode |
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505 | |
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506 | ; All scancodes are saved, even if it wasn't a drive letter, |
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507 | ; which also covers our function key case. Invalid function keys |
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508 | ; will not do anything (won't be printed, won't be accepted as input) |
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509 | mov [es:di], ah |
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510 | |
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511 | ; Drive letter hotkeys remaining, allow 'a' to 'z' |
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512 | call Char_IsLowerCaseLetterInAL |
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513 | jnc SHORT .KeystrokeIsNotValidDriveLetter |
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514 | and al, ~32 ; We want to print upper case letters |
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515 | |
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516 | ; Clear HD First flag to assume Floppy Drive hotkey |
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517 | dec di |
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518 | and BYTE [es:di], ~FLG_HOTKEY_HD_FIRST |
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519 | |
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520 | ; Determine if Floppy or Hard Drive hotkey |
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521 | xchg cx, ax |
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522 | call BootVars_GetLetterForFirstHardDriveToAX |
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523 | cmp cl, al |
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524 | jb SHORT .StoreDriveLetter ; Store Floppy Drive letter |
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525 | |
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526 | ; Store Hard Drive letter |
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527 | or BYTE [es:di], FLG_HOTKEY_HD_FIRST |
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528 | |
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529 | .StoreDriveLetter: |
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530 | sbb di, BYTE 1 ; Sub CF if Floppy Drive |
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531 | xchg ax, cx |
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532 | stosb |
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533 | stc ; Valid hotkey scancode returned in AL |
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534 | |
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535 | .KeystrokeIsNotValidDriveLetter: |
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536 | NoHotkeyToProcess: |
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537 | mov al, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode] |
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538 | ret |
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539 | |
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540 | |
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541 | ;-------------------------------------------------------------------- |
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542 | ; HotkeyBar_GetBootDriveNumbersToDX |
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543 | ; Parameters: |
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544 | ; DS: RAMVARS segment |
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545 | ; ES: BDA segment (zero) |
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546 | ; Returns: |
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547 | ; DX: Drives selected as boot device, DL is primary |
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548 | ; Corrupts registers: |
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549 | ; AX |
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550 | ;-------------------------------------------------------------------- |
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551 | HotkeyBar_GetBootDriveNumbersToDX: |
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552 | mov dx, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters] |
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553 | |
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554 | ; HotkeyBar_GetBootDriveNumbersToDX is called when all drives are detected and |
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555 | ; drive letters are known. |
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556 | ; Replace unavailable hard drive letter with first hard drive. |
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557 | ; If we have boot menu, it will be displayed instead. |
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558 | %ifndef MODULE_BOOT_MENU |
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559 | call BootVars_GetLetterForFirstHardDriveToAX |
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560 | mov ah, al |
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561 | add al, [es:BDA.bHDCount] ; AL now contains first unavailable HD letter |
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562 | cmp dh, al ; Unavailable drive? |
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563 | jb SHORT .ValidHardDriveLetterInDH |
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564 | mov dh, ah ; Replace unavailable drive with first drive |
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565 | .ValidHardDriveLetterInDH: |
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566 | %endif |
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567 | |
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568 | test BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags], FLG_HOTKEY_HD_FIRST |
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569 | jnz SHORT .noflip |
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570 | xchg dl, dh |
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571 | .noflip: |
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572 | call DriveXlate_ConvertDriveLetterInDLtoDriveNumber |
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573 | xchg dl, dh |
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574 | ; Fall to HotkeyBar_FallThroughTo_DriveXlate_ConvertDriveLetterInDLtoDriveNumber |
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575 | |
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576 | HotkeyBar_FallThroughTo_DriveXlate_ConvertDriveLetterInDLtoDriveNumber: |
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577 | |
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