[88] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 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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[95] | 14 | ; DX: Untranslated drive number to be used for booting |
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[3] | 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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[88] | 24 | cmp cx, BYTE NO_ITEM_SELECTED |
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[95] | 25 | je SHORT BootMenu_DisplayAndReturnSelection ; Clear screen and display menu |
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[128] | 26 | ; Fall through to BootMenu_ConvertMenuitemFromCXtoDriveInDX |
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[88] | 27 | |
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[128] | 28 | ;-------------------------------------------------------------------- |
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| 29 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX |
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| 30 | ; Parameters: |
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| 31 | ; CX: Index of menuitem selected from Boot Menu |
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| 32 | ; DS: RAMVARS segment |
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| 33 | ; Returns: |
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| 34 | ; DX: Drive number to be used for booting |
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| 35 | ; Corrupts registers: |
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| 36 | ; CX |
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| 37 | ;-------------------------------------------------------------------- |
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| 38 | ALIGN JUMP_ALIGN |
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| 39 | BootMenu_ConvertMenuitemFromCXtoDriveInDX: |
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| 40 | mov dx, cx ; Copy menuitem index to DX |
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| 41 | call FloppyDrive_GetCountToCX |
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| 42 | cmp dx, cx ; Floppy drive? |
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| 43 | jb SHORT .ReturnFloppyDriveInDX |
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| 44 | sub dx, cx ; Remove floppy drives from index |
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| 45 | or dl, 80h |
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| 46 | .ReturnFloppyDriveInDX: |
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| 47 | ret |
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[88] | 48 | |
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[128] | 49 | |
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[88] | 50 | ;-------------------------------------------------------------------- |
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| 51 | ; Enters Boot Menu or submenu. |
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| 52 | ; |
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| 53 | ; BootMenu_Enter |
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| 54 | ; Parameters: |
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| 55 | ; Nothing |
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| 56 | ; Returns: |
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| 57 | ; CX: Index of selected item or NO_ITEM_SELECTED |
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| 58 | ; Corrupts registers: |
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[127] | 59 | ; AX, BX, DI |
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[88] | 60 | ;-------------------------------------------------------------------- |
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[3] | 61 | ALIGN JUMP_ALIGN |
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[88] | 62 | BootMenu_Enter: |
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| 63 | mov bx, BootMenuEvent_Handler |
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| 64 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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| 65 | xchg cx, ax |
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[3] | 66 | ret |
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| 67 | |
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| 68 | |
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| 69 | ;-------------------------------------------------------------------- |
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| 70 | ; Returns number of menuitems in Boot Menu. |
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| 71 | ; |
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[124] | 72 | ; BootMenu_GetMenuitemCountToAX |
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[3] | 73 | ; Parameters: |
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| 74 | ; DS: RAMVARS segment |
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| 75 | ; Returns: |
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[124] | 76 | ; AX: Number of boot menu items |
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[3] | 77 | ; Corrupts registers: |
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[124] | 78 | ; CX |
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[3] | 79 | ;-------------------------------------------------------------------- |
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| 80 | ALIGN JUMP_ALIGN |
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[124] | 81 | BootMenu_GetMenuitemCountToAX: |
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[32] | 82 | call RamVars_GetHardDiskCountFromBDAtoCX |
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| 83 | xchg ax, cx |
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[124] | 84 | call FloppyDrive_GetCountToCX |
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[3] | 85 | add ax, cx |
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| 86 | ret |
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| 87 | |
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| 88 | |
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| 89 | ;-------------------------------------------------------------------- |
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[124] | 90 | ; BootMenu_GetHeightToAHwithItemCountInAL |
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[3] | 91 | ; Parameters: |
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[124] | 92 | ; AL: Number of menuitems |
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[3] | 93 | ; Returns: |
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[88] | 94 | ; AH: Boot menu height |
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[3] | 95 | ; Corrupts registers: |
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[124] | 96 | ; AL, CX, DI |
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[3] | 97 | ;-------------------------------------------------------------------- |
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| 98 | ALIGN JUMP_ALIGN |
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[124] | 99 | BootMenu_GetHeightToAHwithItemCountInAL: |
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[128] | 100 | add al, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
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[124] | 101 | xchg cx, ax |
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[88] | 102 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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[124] | 103 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info |
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[88] | 104 | MIN_U ah, cl |
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[3] | 105 | ret |
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| 106 | |
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| 107 | |
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| 108 | ;-------------------------------------------------------------------- |
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[92] | 109 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX |
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[3] | 110 | ; Parameters: |
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[92] | 111 | ; AL: ASCII hotkey starting from upper case 'A' |
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[3] | 112 | ; Returns: |
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| 113 | ; CX: Menuitem index |
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| 114 | ; Corrupts registers: |
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| 115 | ; AX |
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| 116 | ;-------------------------------------------------------------------- |
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| 117 | ALIGN JUMP_ALIGN |
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[92] | 118 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX: |
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| 119 | call BootMenu_GetLetterForFirstHardDiskToCL |
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[3] | 120 | cmp al, cl ; Letter is for Hard Disk? |
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| 121 | jae SHORT .StartFromHardDiskLetter |
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| 122 | sub al, 'A' ; Letter to Floppy Drive menuitem |
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| 123 | xchg ax, cx ; Menuitem index to CX |
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| 124 | ret |
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| 125 | ALIGN JUMP_ALIGN |
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| 126 | .StartFromHardDiskLetter: |
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| 127 | sub al, cl ; Hard Disk index |
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[124] | 128 | call FloppyDrive_GetCountToCX |
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[3] | 129 | add cx, ax ; Menuitem index |
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| 130 | ret |
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| 131 | |
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[128] | 132 | |
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[3] | 133 | ;-------------------------------------------------------------------- |
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| 134 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
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| 135 | ; can be higher if more than two floppy drives are found. |
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| 136 | ; |
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[92] | 137 | ; BootMenu_GetLetterForFirstHardDiskToCL |
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[3] | 138 | ; Parameters: |
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| 139 | ; Nothing |
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| 140 | ; Returns: |
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| 141 | ; CL: Upper case letter for first hard disk |
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| 142 | ; Corrupts registers: |
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| 143 | ; CH |
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| 144 | ;-------------------------------------------------------------------- |
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| 145 | ALIGN JUMP_ALIGN |
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[92] | 146 | BootMenu_GetLetterForFirstHardDiskToCL: |
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[124] | 147 | call FloppyDrive_GetCountToCX |
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[3] | 148 | add cl, 'A' |
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| 149 | MAX_U cl, 'C' |
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| 150 | ret |
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| 151 | |
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| 152 | |
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| 153 | ;-------------------------------------------------------------------- |
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[124] | 154 | ; BootMenu_GetMenuitemToDXforDriveInDL |
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[3] | 155 | ; Parameters: |
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| 156 | ; DL: Drive number |
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| 157 | ; Returns: |
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[124] | 158 | ; DX: Menuitem index (assuming drive is available) |
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[3] | 159 | ; Corrupts registers: |
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[124] | 160 | ; Nothing |
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[3] | 161 | ;-------------------------------------------------------------------- |
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| 162 | ALIGN JUMP_ALIGN |
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[124] | 163 | BootMenu_GetMenuitemToDXforDriveInDL: |
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| 164 | xor dh, dh ; Drive number now in DX |
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[128] | 165 | test dl, dl |
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| 166 | jns SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set) |
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[124] | 167 | call FloppyDrive_GetCountToCX |
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[127] | 168 | and dl, ~80h ; Clear HD bit |
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[124] | 169 | add dx, cx |
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| 170 | .ReturnItemIndexInDX: |
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[3] | 171 | ret |
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| 172 | |
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| 173 | |
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| 174 | ;-------------------------------------------------------------------- |
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| 175 | ; Checks is drive number valid for this system. |
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| 176 | ; |
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| 177 | ; BootMenu_IsDriveInSystem |
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| 178 | ; Parameters: |
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| 179 | ; DL: Drive number |
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| 180 | ; DS: RAMVARS segment |
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| 181 | ; Returns: |
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[28] | 182 | ; CF: Set if drive number is valid |
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[3] | 183 | ; Clear if drive is not present in system |
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| 184 | ; Corrupts registers: |
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[28] | 185 | ; AX, CX |
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[3] | 186 | ;-------------------------------------------------------------------- |
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| 187 | ALIGN JUMP_ALIGN |
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| 188 | BootMenu_IsDriveInSystem: |
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[128] | 189 | test dl, dl ; Floppy drive? |
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| 190 | jns SHORT .IsFloppyDriveIsInSystem |
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[32] | 191 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX |
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| 192 | or cl, 80h ; Set Hard Disk bit to CX |
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[28] | 193 | jmp SHORT .CompareDriveNumberToDriveCount |
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[3] | 194 | .IsFloppyDriveIsInSystem: |
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[124] | 195 | call FloppyDrive_GetCountToCX |
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[28] | 196 | .CompareDriveNumberToDriveCount: |
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[124] | 197 | cmp dl, cl ; Set CF when DL is smaller |
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[3] | 198 | ret |
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