1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Displays Boot Menu. |
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3 | |
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4 | ; Section containing code |
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5 | SECTION .text |
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6 | |
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7 | ;-------------------------------------------------------------------- |
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8 | ; Displays Boot Menu and returns Drive or Function number. |
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9 | ; |
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10 | ; BootMenu_DisplayAndReturnSelectionInDX |
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11 | ; Parameters: |
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12 | ; DS: RAMVARS segment |
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13 | ; Returns: |
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14 | ; DX: Untranslated drive number to be used for booting |
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15 | ; Corrupts registers: |
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16 | ; All General Purpose Registers |
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17 | ;-------------------------------------------------------------------- |
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18 | ALIGN JUMP_ALIGN |
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19 | BootMenu_DisplayAndReturnSelectionInDX: |
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20 | call DriveXlate_Reset |
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21 | call BootMenuPrint_TheBottomOfScreen |
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22 | call BootMenu_Enter ; Get selected menuitem index to CX |
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23 | call BootMenuPrint_ClearScreen |
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24 | call BootMenu_GetDriveToDXforMenuitemInCX |
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25 | jnc BootMenu_DisplayAndReturnSelectionInDX |
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26 | ret |
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27 | |
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28 | ;-------------------------------------------------------------------- |
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29 | ; BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS |
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30 | ; BootMenu_GetDriveToDXforMenuitemInCX |
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31 | ; Parameters: |
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32 | ; CX: Index of menuitem selected from Boot Menu |
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33 | ; Returns: |
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34 | ; DX: Drive number to be used for booting |
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35 | ; DS: RAMVARS segment |
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36 | ; CF: Set: There is a selected menu item, DL is valid |
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37 | ; Clear: There is no selected menu item, DL is not valid |
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38 | ; Corrupts registers: |
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39 | ; AX, DI |
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40 | ;-------------------------------------------------------------------- |
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41 | ALIGN JUMP_ALIGN |
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42 | BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS: |
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43 | call RamVars_GetSegmentToDS |
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44 | ;;; fall-through |
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45 | |
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46 | ALIGN JUMP_ALIGN |
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47 | BootMenu_GetDriveToDXforMenuitemInCX: |
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48 | cmp cl, NO_ITEM_HIGHLIGHTED |
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49 | je SHORT .ReturnFloppyDriveInDX ; Clear CF if branch taken |
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50 | |
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51 | mov dl, cl ; Copy menuitem index to DX |
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52 | call FloppyDrive_GetCountToAX |
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53 | cmp dl, al ; Floppy drive? |
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54 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken |
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55 | or al, 80h ; Or 80h into AL before the sub |
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56 | ; to cause CF to be set after |
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57 | ; and result has high order bit set |
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58 | sub dl, al ; Remove floppy drives from index |
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59 | |
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60 | .ReturnFloppyDriveInDX: |
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61 | ret |
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62 | |
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63 | |
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64 | ;-------------------------------------------------------------------- |
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65 | ; Enters Boot Menu or submenu. |
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66 | ; |
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67 | ; BootMenu_Enter |
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68 | ; Parameters: |
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69 | ; Nothing |
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70 | ; Returns: |
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71 | ; CX: Index of selected item or NO_ITEM_SELECTED |
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72 | ; Corrupts registers: |
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73 | ; AX, BX, DI |
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74 | ;-------------------------------------------------------------------- |
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75 | ALIGN JUMP_ALIGN |
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76 | BootMenu_Enter: |
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77 | mov bx, BootMenuEvent_Handler |
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78 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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79 | xchg cx, ax |
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80 | ret |
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81 | |
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82 | |
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83 | ;-------------------------------------------------------------------- |
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84 | ; Returns number of menuitems in Boot Menu. |
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85 | ; |
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86 | ; BootMenu_GetMenuitemCountToAX |
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87 | ; Parameters: |
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88 | ; DS: RAMVARS segment |
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89 | ; Returns: |
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90 | ; AX: Number of boot menu items |
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91 | ; Corrupts registers: |
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92 | ; CX |
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93 | ;-------------------------------------------------------------------- |
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94 | ALIGN JUMP_ALIGN |
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95 | BootMenu_GetMenuitemCountToAX: |
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96 | call RamVars_GetHardDiskCountFromBDAtoAX |
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97 | xchg ax, cx |
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98 | call FloppyDrive_GetCountToAX |
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99 | add ax, cx |
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100 | ret |
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101 | |
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102 | |
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103 | ;-------------------------------------------------------------------- |
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104 | ; BootMenu_GetHeightToAHwithItemCountInAL |
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105 | ; Parameters: |
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106 | ; AL: Number of menuitems |
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107 | ; Returns: |
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108 | ; AH: Boot menu height |
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109 | ; Corrupts registers: |
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110 | ; AL, CX, DI |
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111 | ;-------------------------------------------------------------------- |
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112 | ALIGN JUMP_ALIGN |
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113 | BootMenu_GetHeightToAHwithItemCountInAL: |
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114 | add al, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
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115 | xchg cx, ax |
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116 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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117 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info |
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118 | cmp ah, cl |
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119 | jb SHORT .Return |
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120 | mov ah, cl |
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121 | ALIGN JUMP_ALIGN, ret |
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122 | .Return: |
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123 | ret |
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124 | |
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125 | |
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126 | ;-------------------------------------------------------------------- |
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127 | ; BootMenu_GetMenuitemToAXforAsciiHotkeyInAL |
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128 | ; Parameters: |
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129 | ; AL: ASCII hotkey |
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130 | ; Returns: |
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131 | ; AX: Menuitem index |
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132 | ; Corrupts registers: |
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133 | ; CX |
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134 | ;-------------------------------------------------------------------- |
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135 | ALIGN JUMP_ALIGN |
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136 | BootMenu_GetMenuitemToAXforAsciiHotkeyInAL: |
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137 | call Char_ALtoUpperCaseLetter |
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138 | cbw |
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139 | xchg ax, cx |
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140 | call BootMenu_GetLetterForFirstHardDiskToAL |
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141 | cmp cl, al ; Letter is for Hard Disk? |
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142 | jae SHORT .StartFromHardDiskLetter |
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143 | xchg ax, cx |
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144 | sub al, 'A' ; Letter to Floppy Drive menuitem |
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145 | ret |
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146 | ALIGN JUMP_ALIGN |
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147 | .StartFromHardDiskLetter: |
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148 | sub cl, al ; Hard Disk index |
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149 | call FloppyDrive_GetCountToAX |
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150 | add ax, cx ; Menuitem index |
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151 | ; Note: no need to xchg ax, cx as above, since adding with result to ax |
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152 | ret |
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153 | |
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154 | |
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155 | ;-------------------------------------------------------------------- |
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156 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
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157 | ; can be higher if more than two floppy drives are found. |
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158 | ; |
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159 | ; BootMenu_GetLetterForFirstHardDiskToCL |
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160 | ; Parameters: |
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161 | ; Nothing |
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162 | ; Returns: |
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163 | ; CL: Upper case letter for first hard disk |
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164 | ; Corrupts registers: |
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165 | ; AX |
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166 | ;-------------------------------------------------------------------- |
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167 | ALIGN JUMP_ALIGN |
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168 | BootMenu_GetLetterForFirstHardDiskToAL: |
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169 | call FloppyDrive_GetCountToAX |
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170 | add al, 'A' |
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171 | cmp al, 'C' |
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172 | ja .Return |
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173 | mov al, 'C' |
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174 | ALIGN JUMP_ALIGN, ret |
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175 | .Return: |
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176 | ret |
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177 | |
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178 | |
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179 | ;-------------------------------------------------------------------- |
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180 | ; BootMenu_GetMenuitemToDXforDriveInDL |
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181 | ; Parameters: |
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182 | ; DL: Drive number |
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183 | ; Returns: |
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184 | ; DX: Menuitem index (assuming drive is available) |
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185 | ; Corrupts registers: |
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186 | ; AX |
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187 | ;-------------------------------------------------------------------- |
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188 | ALIGN JUMP_ALIGN |
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189 | BootMenu_GetMenuitemToDXforDriveInDL: |
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190 | xor dh, dh ; Drive number now in DX |
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191 | test dl, dl |
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192 | jns SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set) |
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193 | call FloppyDrive_GetCountToAX |
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194 | and dl, ~80h ; Clear HD bit |
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195 | add dx, ax |
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196 | .ReturnItemIndexInDX: |
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197 | ret |
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198 | |
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199 | |
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200 | ;-------------------------------------------------------------------- |
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201 | ; Checks is drive number valid for this system. |
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202 | ; |
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203 | ; BootMenu_IsDriveInSystem |
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204 | ; Parameters: |
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205 | ; DL: Drive number |
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206 | ; DS: RAMVARS segment |
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207 | ; Returns: |
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208 | ; CF: Set if drive number is valid |
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209 | ; Clear if drive is not present in system |
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210 | ; Corrupts registers: |
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211 | ; AX, CX |
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212 | ;-------------------------------------------------------------------- |
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213 | ALIGN JUMP_ALIGN |
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214 | BootMenu_IsDriveInSystem: |
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215 | test dl, dl ; Floppy drive? |
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216 | jns SHORT .IsFloppyDriveInSystem |
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217 | call RamVars_GetHardDiskCountFromBDAtoAX ; Hard Disk count to AX |
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218 | or al, 80h ; Set Hard Disk bit to AX |
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219 | jmp SHORT .CompareDriveNumberToDriveCount |
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220 | .IsFloppyDriveInSystem: |
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221 | call FloppyDrive_GetCountToAX |
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222 | .CompareDriveNumberToDriveCount: |
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223 | cmp dl, al ; Set CF when DL is smaller |
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224 | ret |
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