| 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Displays Boot Menu.
|
|---|
| 3 |
|
|---|
| 4 | ;
|
|---|
| 5 | ; XTIDE Universal BIOS and Associated Tools
|
|---|
| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
|
|---|
| 7 | ;
|
|---|
| 8 | ; This program is free software; you can redistribute it and/or modify
|
|---|
| 9 | ; it under the terms of the GNU General Public License as published by
|
|---|
| 10 | ; the Free Software Foundation; either version 2 of the License, or
|
|---|
| 11 | ; (at your option) any later version.
|
|---|
| 12 | ;
|
|---|
| 13 | ; This program is distributed in the hope that it will be useful,
|
|---|
| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 16 | ; GNU General Public License for more details.
|
|---|
| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|---|
| 18 | ;
|
|---|
| 19 |
|
|---|
| 20 | ; Section containing code
|
|---|
| 21 | SECTION .text
|
|---|
| 22 |
|
|---|
| 23 | ;--------------------------------------------------------------------
|
|---|
| 24 | ; Displays Boot Menu and returns Drive or Function number.
|
|---|
| 25 | ;
|
|---|
| 26 | ; BootMenu_DisplayAndReturnSelectionInDX
|
|---|
| 27 | ; Parameters:
|
|---|
| 28 | ; DS: RAMVARS segment
|
|---|
| 29 | ; Returns:
|
|---|
| 30 | ; Nothing, selected drive is converted to hotkey
|
|---|
| 31 | ; Corrupts registers:
|
|---|
| 32 | ; All General Purpose Registers
|
|---|
| 33 | ;--------------------------------------------------------------------
|
|---|
| 34 | BootMenu_DisplayAndStoreSelectionAsHotkey:
|
|---|
| 35 | call DriveXlate_Reset
|
|---|
| 36 |
|
|---|
| 37 | mov bx, BootMenuEvent_Handler
|
|---|
| 38 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX
|
|---|
| 39 |
|
|---|
| 40 | ; Clear Boot Menu from screen
|
|---|
| 41 | mov ax, ' ' | (MONO_NORMAL<<8)
|
|---|
| 42 | CALL_DISPLAY_LIBRARY ClearScreenWithCharInALandAttrInAH
|
|---|
| 43 | ret
|
|---|
| 44 |
|
|---|
| 45 |
|
|---|
| 46 | ;--------------------------------------------------------------------
|
|---|
| 47 | ; BootMenu_GetDriveToDXforMenuitemInCX
|
|---|
| 48 | ; Parameters:
|
|---|
| 49 | ; CX: Index of menuitem selected from Boot Menu
|
|---|
| 50 | ; Returns:
|
|---|
| 51 | ; DX: Drive number to be used for booting
|
|---|
| 52 | ; DS: RAMVARS segment
|
|---|
| 53 | ; CF: Set: There is a selected menu item, DL is valid
|
|---|
| 54 | ; Clear: There is no selected menu item, DL is not valid
|
|---|
| 55 | ; Corrupts registers:
|
|---|
| 56 | ; AX, DI
|
|---|
| 57 | ;--------------------------------------------------------------------
|
|---|
| 58 | BootMenu_GetDriveToDXforMenuitemInCX:
|
|---|
| 59 | cmp cl, NO_ITEM_HIGHLIGHTED
|
|---|
| 60 | je SHORT .ReturnFloppyDriveInDX ; Clear CF if branch taken
|
|---|
| 61 |
|
|---|
| 62 | mov dl, cl ; Copy menuitem index to DX
|
|---|
| 63 | call FloppyDrive_GetCountToAX
|
|---|
| 64 | cmp dl, al ; Floppy drive?
|
|---|
| 65 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken
|
|---|
| 66 | or al, 80h ; Or 80h into AL before the sub
|
|---|
| 67 | ; to cause CF to be set after
|
|---|
| 68 | ; and result has high order bit set
|
|---|
| 69 | sub dl, al ; Remove floppy drives from index
|
|---|
| 70 |
|
|---|
| 71 | .ReturnFloppyDriveInDX:
|
|---|
| 72 | ret
|
|---|
