| [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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| [92] | 26 | jmp SHORT BootMenu_ConvertMenuitemFromCXtoDriveInDX
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| [88] | 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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| [3] | 40 | ALIGN JUMP_ALIGN
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| [88] | 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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| [3] | 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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| [124] | 51 | ; BootMenu_GetMenuitemCountToAX
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| [3] | 52 | ; Parameters:
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| 53 | ; DS: RAMVARS segment
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| 54 | ; Returns:
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| [124] | 55 | ; AX: Number of boot menu items
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| [3] | 56 | ; Corrupts registers:
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| [124] | 57 | ; CX
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| [3] | 58 | ;--------------------------------------------------------------------
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| 59 | ALIGN JUMP_ALIGN
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| [124] | 60 | BootMenu_GetMenuitemCountToAX:
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| [32] | 61 | call RamVars_GetHardDiskCountFromBDAtoCX
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| 62 | xchg ax, cx
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| [124] | 63 | call FloppyDrive_GetCountToCX
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| [3] | 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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| [124] | 69 | ; BootMenu_GetHeightToAHwithItemCountInAL
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| [3] | 70 | ; Parameters:
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| [124] | 71 | ; AL: Number of menuitems
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| [3] | 72 | ; Returns:
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| [88] | 73 | ; AH: Boot menu height
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| [3] | 74 | ; Corrupts registers:
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| [124] | 75 | ; AL, CX, DI
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| [3] | 76 | ;--------------------------------------------------------------------
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| 77 | ALIGN JUMP_ALIGN
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| [124] | 78 | BootMenu_GetHeightToAHwithItemCountInAL:
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| 79 | xchg cx, ax
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| [88] | 80 | add cl, BOOT_MENU_HEIGHT_WITHOUT_ITEMS
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| 81 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
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| [124] | 82 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info
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| [88] | 83 | MIN_U ah, cl
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| [3] | 84 | ret
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| 85 |
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| 86 |
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| 87 | ;--------------------------------------------------------------------
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| [92] | 88 | ; BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX
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| [3] | 89 | ; Parameters:
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| [92] | 90 | ; AL: ASCII hotkey starting from upper case 'A'
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| [3] | 91 | ; Returns:
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| 92 | ; CX: Menuitem index
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| 93 | ; Corrupts registers:
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| 94 | ; AX
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| 95 | ;--------------------------------------------------------------------
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| 96 | ALIGN JUMP_ALIGN
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| [92] | 97 | BootMenu_ConvertAsciiHotkeyFromALtoMenuitemInCX:
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| 98 | call BootMenu_GetLetterForFirstHardDiskToCL
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| [3] | 99 | cmp al, cl ; Letter is for Hard Disk?
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| 100 | jae SHORT .StartFromHardDiskLetter
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| 101 | sub al, 'A' ; Letter to Floppy Drive menuitem
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| 102 | xchg ax, cx ; Menuitem index to CX
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| 103 | ret
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| 104 | ALIGN JUMP_ALIGN
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| 105 | .StartFromHardDiskLetter:
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| 106 | sub al, cl ; Hard Disk index
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| [124] | 107 | call FloppyDrive_GetCountToCX
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| [3] | 108 | add cx, ax ; Menuitem index
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| 109 | ret
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| 110 |
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| 111 | ;--------------------------------------------------------------------
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| 112 | ; Returns letter for first hard disk. Usually it will be 'c' but it
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| 113 | ; can be higher if more than two floppy drives are found.
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| 114 | ;
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| [92] | 115 | ; BootMenu_GetLetterForFirstHardDiskToCL
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| [3] | 116 | ; Parameters:
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| 117 | ; Nothing
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| 118 | ; Returns:
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| 119 | ; CL: Upper case letter for first hard disk
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| 120 | ; Corrupts registers:
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| 121 | ; CH
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| 122 | ;--------------------------------------------------------------------
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| 123 | ALIGN JUMP_ALIGN
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| [92] | 124 | BootMenu_GetLetterForFirstHardDiskToCL:
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| [124] | 125 | call FloppyDrive_GetCountToCX
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| [3] | 126 | add cl, 'A'
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| 127 | MAX_U cl, 'C'
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| 128 | ret
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| 129 |
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| 130 |
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| 131 | ;--------------------------------------------------------------------
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| [92] | 132 | ; BootMenu_ConvertMenuitemFromCXtoDriveInDX
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| [3] | 133 | ; Parameters:
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| 134 | ; CX: Index of menuitem selected from Boot Menu
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| 135 | ; DS: RAMVARS segment
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| 136 | ; Returns:
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| [92] | 137 | ; DX: Drive number to be used for booting
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| [3] | 138 | ; Corrupts registers:
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| [92] | 139 | ; CX
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| [3] | 140 | ;--------------------------------------------------------------------
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| 141 | ALIGN JUMP_ALIGN
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| [92] | 142 | BootMenu_ConvertMenuitemFromCXtoDriveInDX:
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| [3] | 143 | mov dx, cx ; Copy menuitem index to DX
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| [124] | 144 | call FloppyDrive_GetCountToCX
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| [3] | 145 | cmp dx, cx ; Floppy drive?
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| 146 | jb SHORT .ReturnFloppyDriveInDX
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| 147 | sub dx, cx ; Remove floppy drives from index
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| 148 | or dl, 80h
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| 149 | .ReturnFloppyDriveInDX:
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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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| 165 | test dl, 80h
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| 166 | jz SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set)
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| 167 | call FloppyDrive_GetCountToCX
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| 168 | add dx, cx
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| 169 | .ReturnItemIndexInDX:
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| [3] | 170 | ret
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| 171 |
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| 172 |
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| 173 | ;--------------------------------------------------------------------
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| 174 | ; Checks is drive number valid for this system.
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| 175 | ;
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| 176 | ; BootMenu_IsDriveInSystem
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| 177 | ; Parameters:
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| 178 | ; DL: Drive number
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| 179 | ; DS: RAMVARS segment
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| 180 | ; Returns:
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| [28] | 181 | ; CF: Set if drive number is valid
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| [3] | 182 | ; Clear if drive is not present in system
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| 183 | ; Corrupts registers:
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| [28] | 184 | ; AX, CX
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| [3] | 185 | ;--------------------------------------------------------------------
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| 186 | ALIGN JUMP_ALIGN
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| 187 | BootMenu_IsDriveInSystem:
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| [32] | 188 | test dl, 80h ; Floppy drive?
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| [3] | 189 | jz SHORT .IsFloppyDriveIsInSystem
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| [32] | 190 | call RamVars_GetHardDiskCountFromBDAtoCX ; Hard Disk count to CX
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| 191 | or cl, 80h ; Set Hard Disk bit to CX
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| [28] | 192 | jmp SHORT .CompareDriveNumberToDriveCount
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| [3] | 193 | .IsFloppyDriveIsInSystem:
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| [124] | 194 | call FloppyDrive_GetCountToCX
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| [28] | 195 | .CompareDriveNumberToDriveCount:
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| [124] | 196 | cmp dl, cl ; Set CF when DL is smaller
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| [3] | 197 | ret
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