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