| 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 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Displays Boot Menu and returns Drive or Function number.
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| 25 | ;
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| 26 | ; BootMenu_DisplayAndReturnDriveInDLRomBootClearCF
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| 27 | ; Parameters:
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| 28 | ; DS: RAMVARS segment
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| 29 | ; Returns:
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| 30 | ; DL: Drive number selected
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| 31 | ; CF: Set if selected item is an actual drive, DL is valid
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| 32 | ; Clear if selected item is Rom Boot, DL is invalid
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| 33 | ; Corrupts registers:
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| 34 | ; All General Purpose Registers
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| 35 | ;--------------------------------------------------------------------
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| 36 | BootMenu_DisplayAndReturnDriveInDLRomBootClearCF:
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| 37 | call DriveXlate_Reset
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| 38 |
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| 39 | mov bx, BootMenuEvent_Handler
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| 40 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX
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| 41 |
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| 42 | xchg cx, ax
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| 43 |
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| 44 | ; Clear Boot Menu from screen
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| 45 | mov ax, ' ' | (MONO_NORMAL<<8)
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| 46 | CALL_DISPLAY_LIBRARY ClearScreenWithCharInALandAttrInAH
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| 47 |
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| 48 | ; fall through to BootMenu_GetDriveToDXforMenuitemInCX
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| 49 |
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| 50 | ;--------------------------------------------------------------------
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| 51 | ; BootMenu_GetDriveToDXforMenuitemInCX
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| 52 | ; Parameters:
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| 53 | ; CX: Index of menuitem selected from Boot Menu
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| 54 | ; DS: RAMVARS segment
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| 55 | ; Returns:
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| 56 | ; DX: Drive number to be used for booting
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| 57 | ; CF: Set: There is a selected menu item, DL is valid
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| 58 | ; Clear: The item selected is Rom Boot, DL is not valid
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| 59 | ; Corrupts registers:
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| 60 | ; AX, BX
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| 61 | ;
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| 62 | ; NOTE: We can't use the menu structure in here, as we are falling through
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| 63 | ; from BootMenu_DisplayAndReturnDriveInDLRomBootClearCF when the
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| 64 | ; menu structure has already been destroyed.
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| 65 | ;--------------------------------------------------------------------
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| 66 | BootMenu_GetDriveToDXforMenuitemInCX:
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| 67 | mov dl, cl ; Copy menuitem index to DX
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| 68 | call FloppyDrive_GetCountToAX
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| 69 | cmp dl, al ; Floppy drive?
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| 70 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken
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| 71 | or al, 80h ; Or 80h into AL before the sub
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| 72 | ; shorter instruction than or'ing it in afterward
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| 73 | sub dl, al ; Remove floppy drives from index
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| 74 | call RamVars_GetHardDiskCountFromBDAtoAX
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| 75 | or al, 80h ; Or 80h into AL before the sub
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| 76 | cmp dl, al ; Set CF if hard disk
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| 77 | ; Clear CF if last item, beyond hard disk list, which indicates ROM boot
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| 78 | .ReturnFloppyDriveInDX:
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| 79 | ret
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