[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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| 14 | ; DX: Untranslated drive number to be used for booting (if CF cleared) |
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| 15 | ; Function number (if CF set) |
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| 16 | ; CF: Cleared if drive selected |
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| 17 | ; Set if function selected |
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| 18 | ; Corrupts registers: |
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| 19 | ; All General Purpose Registers |
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| 20 | ;-------------------------------------------------------------------- |
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| 21 | ALIGN JUMP_ALIGN |
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| 22 | BootMenu_DisplayAndReturnSelection: |
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| 23 | call DriveXlate_Reset |
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| 24 | call BootMenuPrint_TheBottomOfScreen |
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| 25 | call BootMenu_Enter ; Get selected menuitem index to CX |
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| 26 | call BootMenuPrint_ClearScreen |
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[88] | 27 | cmp cx, BYTE NO_ITEM_SELECTED |
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| 28 | je SHORT BootMenu_DisplayAndReturnSelection |
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[3] | 29 | jmp BootMenu_ConvertMenuitemToDriveOrFunction |
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[88] | 30 | |
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| 31 | |
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| 32 | ;-------------------------------------------------------------------- |
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| 33 | ; Enters Boot Menu or submenu. |
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| 34 | ; |
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| 35 | ; BootMenu_Enter |
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| 36 | ; Parameters: |
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| 37 | ; Nothing |
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| 38 | ; Returns: |
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| 39 | ; CX: Index of selected item or NO_ITEM_SELECTED |
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| 40 | ; Corrupts registers: |
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| 41 | ; BX, DI |
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| 42 | ;-------------------------------------------------------------------- |
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[3] | 43 | ALIGN JUMP_ALIGN |
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[88] | 44 | BootMenu_Enter: |
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| 45 | mov bx, BootMenuEvent_Handler |
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| 46 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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| 47 | xchg cx, ax |
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[3] | 48 | ret |
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| 49 | |
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| 50 | |
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| 51 | ;-------------------------------------------------------------------- |
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| 52 | ; Returns number of menuitems in Boot Menu. |
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| 53 | ; |
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[88] | 54 | ; BootMenu_GetMenuitemCountToCX |
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[3] | 55 | ; Parameters: |
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| 56 | ; DS: RAMVARS segment |
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| 57 | ; Returns: |
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| 58 | ; CX: Number of boot menu items |
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| 59 | ; Corrupts registers: |
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| 60 | ; AX |
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| 61 | ;-------------------------------------------------------------------- |
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| 62 | ALIGN JUMP_ALIGN |
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[88] | 63 | BootMenu_GetMenuitemCountToCX: |
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[32] | 64 | call RamVars_GetHardDiskCountFromBDAtoCX |
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| 65 | xchg ax, cx |
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[3] | 66 | call FloppyDrive_GetCount |
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| 67 | add ax, cx |
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| 68 | call BootMenu_GetMenuFunctionCount |
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| 69 | add cx, ax |
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| 70 | ret |
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| 71 | |
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| 72 | ;-------------------------------------------------------------------- |
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| 73 | ; Returns number of functions displayed in Boot Menu. |
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| 74 | ; |
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| 75 | ; BootMenu_GetMenuFunctionCount |
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| 76 | ; Parameters: |
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| 77 | ; Nothing |
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| 78 | ; Returns: |
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| 79 | ; CX: Number of boot menu functions |
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| 80 | ; Corrupts registers: |
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| 81 | ; Nothing |
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| 82 | ;-------------------------------------------------------------------- |
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| 83 | ALIGN JUMP_ALIGN |
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| 84 | BootMenu_GetMenuFunctionCount: |
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| 85 | xor cx, cx |
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| 86 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_ROMBOOT |
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| 87 | jz SHORT .DontIncludeRomBoot |
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| 88 | inc cx |
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| 89 | ALIGN JUMP_ALIGN |
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| 90 | .DontIncludeRomBoot: |
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| 91 | ret |
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| 92 | |
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| 93 | |
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| 94 | ;-------------------------------------------------------------------- |
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[88] | 95 | ; BootMenu_GetHeightToALwithItemCountInCL |
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[3] | 96 | ; Parameters: |
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[88] | 97 | ; CL: Number of menuitems |
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[3] | 98 | ; Returns: |
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[88] | 99 | ; AH: Boot menu height |
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[3] | 100 | ; Corrupts registers: |
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[88] | 101 | ; AL, CL, DI |
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[3] | 102 | ;-------------------------------------------------------------------- |
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| 103 | ALIGN JUMP_ALIGN |
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[88] | 104 | BootMenu_GetHeightToAHwithItemCountInCL: |
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| 105 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS |
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| 106 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH |
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| 107 | MIN_U ah, cl |
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[3] | 108 | ret |
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| 109 | |
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| 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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| 112 | ; Converts any hotkey to Boot Menu menuitem index. |
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| 113 | ; |
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| 114 | ; BootMenu_ConvertHotkeyToMenuitem |
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| 115 | ; Parameters: |
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| 116 | ; AX: ASCII hotkey starting from upper case 'A' |
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| 117 | ; Returns: |
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| 118 | ; CX: Menuitem index |
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| 119 | ; Corrupts registers: |
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| 120 | ; AX |
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| 121 | ;-------------------------------------------------------------------- |
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| 122 | ALIGN JUMP_ALIGN |
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| 123 | BootMenu_ConvertHotkeyToMenuitem: |
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| 124 | call BootMenu_GetLetterForFirstHardDisk |
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| 125 | cmp al, cl ; Letter is for Hard Disk? |
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| 126 | jae SHORT .StartFromHardDiskLetter |
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| 127 | sub al, 'A' ; Letter to Floppy Drive menuitem |
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| 128 | xchg ax, cx ; Menuitem index to CX |
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| 129 | ret |
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| 130 | ALIGN JUMP_ALIGN |
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| 131 | .StartFromHardDiskLetter: |
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| 132 | sub al, cl ; Hard Disk index |
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| 133 | call FloppyDrive_GetCount |
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| 134 | add cx, ax ; Menuitem index |
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| 135 | ret |
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| 136 | |
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| 137 | ;-------------------------------------------------------------------- |
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| 138 | ; Returns letter for first hard disk. Usually it will be 'c' but it |
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| 139 | ; can be higher if more than two floppy drives are found. |
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| 140 | ; |
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| 141 | ; BootMenu_GetLetterForFirstHardDisk |
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| 142 | ; Parameters: |
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| 143 | ; Nothing |
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| 144 | ; Returns: |
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| 145 | ; CL: Upper case letter for first hard disk |
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| 146 | ; Corrupts registers: |
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| 147 | ; CH |
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| 148 | ;-------------------------------------------------------------------- |
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| 149 | ALIGN JUMP_ALIGN |
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| 150 | BootMenu_GetLetterForFirstHardDisk: |
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| 151 | call FloppyDrive_GetCount |
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| 152 | add cl, 'A' |
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| 153 | MAX_U cl, 'C' |
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| 154 | ret |
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| 155 | |
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| 156 | |
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| 157 | ;-------------------------------------------------------------------- |
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| 158 | ; Converts selected menuitem index to drive number or function ID. |
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| 159 | ; |
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| 160 | ; BootMenu_ConvertMenuitemToDriveOrFunction |
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| 161 | ; Parameters: |
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| 162 | ; CX: Index of menuitem selected from Boot Menu |
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| 163 | ; DS: RAMVARS segment |
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| 164 | ; Returns: |
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| 165 | ; DX: Drive number to be used for booting (if CF cleared) |
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| 166 | ; Function ID (if CF set) |
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| 167 | ; CF: Cleared if drive selected |
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| 168 | ; Set if function selected |
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| 169 | ; Corrupts registers: |
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| 170 | ; AX, CX |
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| 171 | ;-------------------------------------------------------------------- |
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| 172 | ALIGN JUMP_ALIGN |
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| 173 | BootMenu_ConvertMenuitemToDriveOrFunction: |
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| 174 | mov dx, cx ; Copy menuitem index to DX |
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| 175 | call FloppyDrive_GetCount |
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| 176 | cmp dx, cx ; Floppy drive? |
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| 177 | jb SHORT .ReturnFloppyDriveInDX |
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| 178 | sub dx, cx ; Remove floppy drives from index |
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[32] | 179 | call RamVars_GetHardDiskCountFromBDAtoCX |
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[3] | 180 | cmp dx, cx ; Hard disk? |
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| 181 | jb SHORT .ReturnHardDiskInDX |
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| 182 | sub dx, cx ; Remove hard disks from index |
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| 183 | jmp SHORT BootMenu_ConvertFunctionIndexToID |
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| 184 | ALIGN JUMP_ALIGN |
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| 185 | .ReturnHardDiskInDX: |
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| 186 | or dl, 80h |
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| 187 | ALIGN JUMP_ALIGN |
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| 188 | .ReturnFloppyDriveInDX: |
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| 189 | clc |
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| 190 | ret |
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| 191 | |
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| 192 | |
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| 193 | ;-------------------------------------------------------------------- |
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| 194 | ; Converts selected menuitem index to drive number or function ID. |
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| 195 | ; |
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| 196 | ; BootMenu_ConvertFunctionIndexToID |
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| 197 | ; Parameters: |
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| 198 | ; CX: Menuitem index |
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| 199 | ; DX: Function index (Menuitem index - floppy count - HD count) |
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| 200 | ; Returns: |
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| 201 | ; DX: Function ID |
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| 202 | ; CF: Set to indicate function |
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| 203 | ; Corrupts registers: |
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| 204 | ; AX, CX |
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| 205 | ;-------------------------------------------------------------------- |
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| 206 | ALIGN JUMP_ALIGN |
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| 207 | BootMenu_ConvertFunctionIndexToID: |
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| 208 | mov dx, ID_BOOTFUNC_ROMBOOT |
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| 209 | stc |
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| 210 | ret |
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| 211 | |
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| 212 | |
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| 213 | ;-------------------------------------------------------------------- |
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| 214 | ; Converts Floppy or Hard Disk Drive number to menuitem index. |
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| 215 | ; This function does not check does the drive really exists. |
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| 216 | ; |
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| 217 | ; BootMenu_ConvertDriveToMenuitem |
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| 218 | ; Parameters: |
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| 219 | ; DL: Drive number |
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| 220 | ; Returns: |
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| 221 | ; CX: Menuitem index (assuming drive is available) |
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| 222 | ; Corrupts registers: |
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| 223 | ; AX |
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| 224 | ;-------------------------------------------------------------------- |
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| 225 | ALIGN JUMP_ALIGN |
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| 226 | BootMenu_ConvertDriveToMenuitem: |
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| 227 | test dl, 80h ; Floppy drive? |
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| 228 | jz SHORT .ReturnFloppyMenuitem |
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| 229 | call FloppyDrive_GetCount |
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| 230 | mov ax, 7Fh ; Load mask to clear floppy bit |
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| 231 | and ax, dx ; AX = Hard Disk index |
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| 232 | add cx, ax ; Add hard disk index to floppy drive count |
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| 233 | ret |
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| 234 | ALIGN JUMP_ALIGN |
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| 235 | .ReturnFloppyMenuitem: |
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| 236 | eMOVZX cx, dl ; Drive number and item index are equal |
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| 237 | ret |
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| 238 | |
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| 239 | |
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| 240 | ;-------------------------------------------------------------------- |
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| 241 | ; Checks is drive number valid for this system. |
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| 242 | ; |
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| 243 | ; BootMenu_IsDriveInSystem |
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| 244 | ; Parameters: |
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| 245 | ; DL: Drive number |
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| 246 | ; DS: RAMVARS segment |
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| 247 | ; Returns: |
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[28] | 248 | ; CF: Set if drive number is valid |
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[3] | 249 | ; Clear if drive is not present in system |
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| 250 | ; Corrupts registers: |
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[28] | 251 | ; AX, CX |
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[3] | 252 | ;-------------------------------------------------------------------- |
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| 253 | ALIGN JUMP_ALIGN |
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| 254 | BootMenu_IsDriveInSystem: |
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[32] | 255 | test dl, 80h ; Floppy drive? |
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[3] | 256 | jz SHORT .IsFloppyDriveIsInSystem |
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[32] | 257 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX |
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| 258 | or cl, 80h ; Set Hard Disk bit to CX |
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[28] | 259 | jmp SHORT .CompareDriveNumberToDriveCount |
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[3] | 260 | .IsFloppyDriveIsInSystem: |
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[32] | 261 | call FloppyDrive_GetCount ; Floppy Drive count to CX |
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[28] | 262 | .CompareDriveNumberToDriveCount: |
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[3] | 263 | cmp dl, cl |
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| 264 | ret |
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