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_DisplayAndReturnSelection
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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_DisplayAndReturnSelection:
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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 | cmp cx, BYTE NO_ITEM_SELECTED
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25 | je SHORT BootMenu_DisplayAndReturnSelection ; Clear screen and display menu
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26 | jmp SHORT BootMenu_ConvertMenuitemFromCXtoDriveInDX
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27 |
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28 |
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29 | ;--------------------------------------------------------------------
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30 | ; Enters Boot Menu or submenu.
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31 | ;
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32 | ; BootMenu_Enter
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33 | ; Parameters:
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34 | ; Nothing
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35 | ; Returns:
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36 | ; CX: Index of selected item or NO_ITEM_SELECTED
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37 | ; Corrupts registers:
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38 | ; BX, DI
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39 | ;--------------------------------------------------------------------
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40 | ALIGN JUMP_ALIGN
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41 | BootMenu_Enter:
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42 | mov bx, BootMenuEvent_Handler
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43 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX
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44 | xchg cx, ax
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45 | ret
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46 |
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47 |
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48 | ;--------------------------------------------------------------------
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49 | ; Returns number of menuitems in Boot Menu.
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50 | ;
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51 | ; BootMenu_GetMenuitemCountToCX
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52 | ; Parameters:
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53 | ; DS: RAMVARS segment
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54 | ; Returns:
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55 | ; CX: Number of boot menu items
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56 | ; Corrupts registers:
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57 | ; AX
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58 | ;--------------------------------------------------------------------
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59 | ALIGN JUMP_ALIGN
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60 | BootMenu_GetMenuitemCountToCX:
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61 | call RamVars_GetHardDiskCountFromBDAtoCX
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62 | xchg ax, cx
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63 | call FloppyDrive_GetCount
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64 | add ax, cx
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65 | ret
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66 |
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67 |
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68 | ;--------------------------------------------------------------------
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69 | ; BootMenu_GetHeightToALwithItemCountInCL
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70 | ; Parameters:
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71 | ; CL: Number of menuitems
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72 | ; Returns:
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73 | ; AH: Boot menu height
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74 | ; Corrupts registers:
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75 | ; AL, CL, DI
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76 | ;--------------------------------------------------------------------
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77 | ALIGN JUMP_ALIGN
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78 | BootMenu_GetHeightToAHwithItemCountInCL:
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79 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS
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80 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
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81 | sub ah, MENU_SCREEN_BOTTOM_LINES*2
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82 | MIN_U ah, cl
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83 | ret
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84 |
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85 |
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86 | ;--------------------------------------------------------------------
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87 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX
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88 | ; Parameters:
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89 | ; AL: ASCII hotkey starting from upper case 'A'
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90 | ; Returns:
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91 | ; CX: Menuitem index
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92 | ; Corrupts registers:
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93 | ; AX
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94 | ;--------------------------------------------------------------------
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95 | ALIGN JUMP_ALIGN
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96 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX:
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97 | call BootMenu_GetLetterForFirstHardDiskToCL
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98 | cmp al, cl ; Letter is for Hard Disk?
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99 | jae SHORT .StartFromHardDiskLetter
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100 | sub al, 'A' ; Letter to Floppy Drive menuitem
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101 | xchg ax, cx ; Menuitem index to CX
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102 | ret
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103 | ALIGN JUMP_ALIGN
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104 | .StartFromHardDiskLetter:
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105 | sub al, cl ; Hard Disk index
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106 | call FloppyDrive_GetCount
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107 | add cx, ax ; Menuitem index
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108 | ret
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109 |
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110 | ;--------------------------------------------------------------------
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111 | ; Returns letter for first hard disk. Usually it will be 'c' but it
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112 | ; can be higher if more than two floppy drives are found.
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113 | ;
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114 | ; BootMenu_GetLetterForFirstHardDiskToCL
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115 | ; Parameters:
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116 | ; Nothing
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117 | ; Returns:
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118 | ; CL: Upper case letter for first hard disk
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119 | ; Corrupts registers:
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120 | ; CH
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121 | ;--------------------------------------------------------------------
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122 | ALIGN JUMP_ALIGN
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123 | BootMenu_GetLetterForFirstHardDiskToCL:
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124 | call FloppyDrive_GetCount
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125 | add cl, 'A'
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126 | MAX_U cl, 'C'
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127 | ret
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128 |
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129 |
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130 | ;--------------------------------------------------------------------
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131 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX
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132 | ; Parameters:
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133 | ; CX: Index of menuitem selected from Boot Menu
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134 | ; DS: RAMVARS segment
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135 | ; Returns:
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136 | ; DX: Drive number to be used for booting
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137 | ; Corrupts registers:
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138 | ; CX
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139 | ;--------------------------------------------------------------------
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140 | ALIGN JUMP_ALIGN
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141 | BootMenu_ConvertMenuitemFromCXtoDriveInDX:
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142 | mov dx, cx ; Copy menuitem index to DX
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143 | call FloppyDrive_GetCount
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144 | cmp dx, cx ; Floppy drive?
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145 | jb SHORT .ReturnFloppyDriveInDX
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146 | sub dx, cx ; Remove floppy drives from index
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147 | or dl, 80h
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148 | .ReturnFloppyDriveInDX:
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149 | ret
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150 |
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151 |
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152 | ;--------------------------------------------------------------------
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153 | ; Converts Floppy or Hard Disk Drive number to menuitem index.
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154 | ; This function does not check does the drive really exists.
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155 | ;
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156 | ; BootMenu_ConvertDriveToMenuitem
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157 | ; Parameters:
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158 | ; DL: Drive number
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159 | ; Returns:
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160 | ; CX: Menuitem index (assuming drive is available)
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161 | ; Corrupts registers:
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162 | ; AX
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163 | ;--------------------------------------------------------------------
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164 | ALIGN JUMP_ALIGN
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165 | BootMenu_ConvertDriveToMenuitem:
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166 | test dl, 80h ; Floppy drive?
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167 | jz SHORT .ReturnFloppyMenuitem
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168 | call FloppyDrive_GetCount
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169 | mov ax, 7Fh ; Load mask to clear floppy bit
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170 | and ax, dx ; AX = Hard Disk index
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171 | add cx, ax ; Add hard disk index to floppy drive count
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172 | ret
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173 | ALIGN JUMP_ALIGN
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174 | .ReturnFloppyMenuitem:
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175 | eMOVZX cx, dl ; Drive number and item index are equal
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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 | ; Checks is drive number valid for this system.
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181 | ;
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182 | ; BootMenu_IsDriveInSystem
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183 | ; Parameters:
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184 | ; DL: Drive number
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185 | ; DS: RAMVARS segment
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186 | ; Returns:
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187 | ; CF: Set if drive number is valid
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188 | ; Clear if drive is not present in system
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189 | ; Corrupts registers:
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190 | ; AX, CX
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191 | ;--------------------------------------------------------------------
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192 | ALIGN JUMP_ALIGN
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193 | BootMenu_IsDriveInSystem:
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194 | test dl, 80h ; Floppy drive?
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195 | jz SHORT .IsFloppyDriveIsInSystem
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196 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX
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197 | or cl, 80h ; Set Hard Disk bit to CX
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198 | jmp SHORT .CompareDriveNumberToDriveCount
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199 | .IsFloppyDriveIsInSystem:
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200 | call FloppyDrive_GetCount ; Floppy Drive count to CX
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201 | .CompareDriveNumberToDriveCount:
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202 | cmp dl, cl
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203 | ret
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