| 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_And_RamVars_GetSegmentToDS
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| 30 | ; BootMenu_GetDriveToDXforMenuitemInCX
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| 31 | ; Parameters:
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| 32 | ; CX: Index of menuitem selected from Boot Menu
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| 33 | ; Returns:
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| 34 | ; DX: Drive number to be used for booting
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| 35 | ; DS: RAMVARS segment
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| 36 | ; CF: Set: There is a selected menu item, DL is valid
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| 37 | ; Clear: There is no selected menu item, DL is not valid
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| 38 | ; Corrupts registers:
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| 39 | ; AX, DI
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| 40 | ;--------------------------------------------------------------------
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| 41 | ALIGN JUMP_ALIGN
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| 42 | BootMenu_GetDriveToDXforMenuitemInCX_And_RamVars_GetSegmentToDS:
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| 43 | call RamVars_GetSegmentToDS
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| 44 | ;;; fall-through
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| 45 |
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| 46 | ALIGN JUMP_ALIGN
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| 47 | BootMenu_GetDriveToDXforMenuitemInCX:
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| 48 | cmp cl, NO_ITEM_HIGHLIGHTED
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| 49 | je SHORT .ReturnFloppyDriveInDX ; Clear CF if branch taken
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| 50 |
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| 51 | mov dl, cl ; Copy menuitem index to DX
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| 52 | call FloppyDrive_GetCountToAX
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| 53 | cmp dl, al ; Floppy drive?
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| 54 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken
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| 55 | or al, 80h ; Or 80h into AL before the sub
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| 56 | ; to cause CF to be set after
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| 57 | ; and result has high order bit set
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| 58 | sub dl, al ; Remove floppy drives from index
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| 59 |
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| 60 | .ReturnFloppyDriveInDX:
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| 61 | ret
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| 62 |
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| 63 |
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| 64 | ;--------------------------------------------------------------------
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| 65 | ; Enters Boot Menu or submenu.
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| 66 | ;
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| 67 | ; BootMenu_Enter
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| 68 | ; Parameters:
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| 69 | ; Nothing
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| 70 | ; Returns:
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| 71 | ; CX: Index of selected item or NO_ITEM_SELECTED
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| 72 | ; Corrupts registers:
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| 73 | ; AX, BX, DI
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| 74 | ;--------------------------------------------------------------------
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| 75 | ALIGN JUMP_ALIGN
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| 76 | BootMenu_Enter:
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| 77 | mov bx, BootMenuEvent_Handler
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| 78 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX
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| 79 | xchg cx, ax
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| 80 | ret
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| 81 |
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| 82 |
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| 83 | ;--------------------------------------------------------------------
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| 84 | ; Returns number of menuitems in Boot Menu.
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| 85 | ;
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| 86 | ; BootMenu_GetMenuitemCountToAX
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| 87 | ; Parameters:
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| 88 | ; DS: RAMVARS segment
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| 89 | ; Returns:
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| 90 | ; AX: Number of boot menu items
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| 91 | ; Corrupts registers:
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| 92 | ; CX
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| 93 | ;--------------------------------------------------------------------
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| 94 | ALIGN JUMP_ALIGN
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| 95 | BootMenu_GetMenuitemCountToAX:
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| 96 | call RamVars_GetHardDiskCountFromBDAtoAX
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| 97 | xchg ax, cx
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| 98 | call FloppyDrive_GetCountToAX
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| 99 | add ax, cx
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| 100 | ret
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| 101 |
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| 102 |
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| 103 | ;--------------------------------------------------------------------
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| 104 | ; BootMenu_GetHeightToAHwithItemCountInAL
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| 105 | ; Parameters:
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| 106 | ; AL: Number of menuitems
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| 107 | ; Returns:
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| 108 | ; AH: Boot menu height
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| 109 | ; Corrupts registers:
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| 110 | ; AL, CX, DI
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| 111 | ;--------------------------------------------------------------------
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| 112 | ALIGN JUMP_ALIGN
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| 113 | BootMenu_GetHeightToAHwithItemCountInAL:
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| 114 | add al, BOOT_MENU_HEIGHT_WITHOUT_ITEMS
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| 115 | xchg cx, ax
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| 116 | CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
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| 117 | sub ah, MENU_SCREEN_BOTTOM_LINES*2 ; Leave space for bottom info
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| 118 | cmp ah, cl
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| 119 | jb SHORT .Return
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| 120 | mov ah, cl
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| 121 | ALIGN JUMP_ALIGN, ret
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| 122 | .Return:
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| 123 | ret
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| 124 |
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| 125 |
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| 126 | ;--------------------------------------------------------------------
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| 127 | ; BootMenu_GetMenuitemToAXforAsciiHotkeyInAL
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| 128 | ; Parameters:
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| 129 | ; AL: ASCII hotkey
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| 130 | ; Returns:
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| 131 | ; AX: Menuitem index
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| 132 | ; Corrupts registers:
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| 133 | ; CX
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| 134 | ;--------------------------------------------------------------------
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| 135 | ALIGN JUMP_ALIGN
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| 136 | BootMenu_GetMenuitemToAXforAsciiHotkeyInAL:
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| 137 | call Char_ALtoUpperCaseLetter
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| 138 | cbw
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| 139 | xchg ax, cx
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| 140 | call BootMenu_GetLetterForFirstHardDiskToAL
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| 141 | cmp cl, al ; Letter is for Hard Disk?
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| 142 | jae SHORT .StartFromHardDiskLetter
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| 143 | xchg ax, cx
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| 144 | sub al, 'A' ; Letter to Floppy Drive menuitem
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| 145 | ret
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| 146 | ALIGN JUMP_ALIGN
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| 147 | .StartFromHardDiskLetter:
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| 148 | sub cl, al ; Hard Disk index
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| 149 | call FloppyDrive_GetCountToAX
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| 150 | add ax, cx ; Menuitem index
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| 151 | ; Note: no need to xchg ax, cx as above, since adding with result to ax
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| 152 | ret
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| 153 |
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| 154 |
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| 155 | ;--------------------------------------------------------------------
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| 156 | ; Returns letter for first hard disk. Usually it will be 'c' but it
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| 157 | ; can be higher if more than two floppy drives are found.
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| 158 | ;
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| 159 | ; BootMenu_GetLetterForFirstHardDiskToCL
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| 160 | ; Parameters:
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| 161 | ; Nothing
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| 162 | ; Returns:
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| 163 | ; CL: Upper case letter for first hard disk
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| 164 | ; Corrupts registers:
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| 165 | ; AX
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| 166 | ;--------------------------------------------------------------------
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| 167 | ALIGN JUMP_ALIGN
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| 168 | BootMenu_GetLetterForFirstHardDiskToAL:
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| 169 | call FloppyDrive_GetCountToAX
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| 170 | add al, 'A'
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| 171 | cmp al, 'C'
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| 172 | ja .Return
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| 173 | mov al, 'C'
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| 174 | ALIGN JUMP_ALIGN, ret
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| 175 | .Return:
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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 | ; BootMenu_GetMenuitemToDXforDriveInDL
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| 181 | ; Parameters:
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| 182 | ; DL: Drive number
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| 183 | ; Returns:
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| 184 | ; DX: Menuitem index (assuming drive is available)
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| 185 | ; Corrupts registers:
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| 186 | ; AX
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| 187 | ;--------------------------------------------------------------------
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| 188 | ALIGN JUMP_ALIGN
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| 189 | BootMenu_GetMenuitemToDXforDriveInDL:
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| 190 | xor dh, dh ; Drive number now in DX
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| 191 | test dl, dl
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| 192 | jns SHORT .ReturnItemIndexInDX ; Return if floppy drive (HD bit not set)
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| 193 | call FloppyDrive_GetCountToAX
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| 194 | and dl, ~80h ; Clear HD bit
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| 195 | add dx, ax
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| 196 | .ReturnItemIndexInDX:
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| 197 | ret
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| 198 |
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| 199 |
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| 200 | ;--------------------------------------------------------------------
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| 201 | ; Checks is drive number valid for this system.
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| 202 | ;
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| 203 | ; BootMenu_IsDriveInSystem
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| 204 | ; Parameters:
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| 205 | ; DL: Drive number
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| 206 | ; DS: RAMVARS segment
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| 207 | ; Returns:
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| 208 | ; CF: Set if drive number is valid
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| 209 | ; Clear if drive is not present in system
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| 210 | ; Corrupts registers:
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| 211 | ; AX, CX
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| 212 | ;--------------------------------------------------------------------
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| 213 | ALIGN JUMP_ALIGN
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| 214 | BootMenu_IsDriveInSystem:
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| 215 | test dl, dl ; Floppy drive?
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| 216 | jns SHORT .IsFloppyDriveInSystem
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| 217 | call RamVars_GetHardDiskCountFromBDAtoAX ; Hard Disk count to AX
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| 218 | or al, 80h ; Set Hard Disk bit to AX
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| 219 | jmp SHORT .CompareDriveNumberToDriveCount
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| 220 | .IsFloppyDriveInSystem:
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| 221 | call FloppyDrive_GetCountToAX
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| 222 | .CompareDriveNumberToDriveCount:
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| 223 | cmp dl, al ; Set CF when DL is smaller
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| 224 | ret
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