[392] | 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, 2011-2012 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_DisplayAndReturnSelectionInDX |
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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 | ; Nothing, selected drive is converted to hotkey |
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| 31 | ; Corrupts registers: |
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| 32 | ; All General Purpose Registers |
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| 33 | ;-------------------------------------------------------------------- |
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| 34 | BootMenu_DisplayAndStoreSelectionAsHotkey: |
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| 35 | call DriveXlate_Reset |
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| 36 | |
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| 37 | mov bx, BootMenuEvent_Handler |
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| 38 | CALL_MENU_LIBRARY DisplayWithHandlerInBXandUserDataInDXAX |
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| 39 | |
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| 40 | ; Clear Boot Menu from screen |
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| 41 | mov ax, ' ' | (MONO_NORMAL<<8) |
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| 42 | CALL_DISPLAY_LIBRARY ClearScreenWithCharInALandAttrInAH |
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| 43 | ret |
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| 44 | |
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| 45 | |
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| 46 | ;-------------------------------------------------------------------- |
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| 47 | ; BootMenu_GetDriveToDXforMenuitemInCX |
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| 48 | ; Parameters: |
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| 49 | ; CX: Index of menuitem selected from Boot Menu |
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| 50 | ; Returns: |
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| 51 | ; DX: Drive number to be used for booting |
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| 52 | ; DS: RAMVARS segment |
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| 53 | ; CF: Set: There is a selected menu item, DL is valid |
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| 54 | ; Clear: There is no selected menu item, DL is not valid |
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| 55 | ; Corrupts registers: |
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| 56 | ; AX, DI |
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| 57 | ;-------------------------------------------------------------------- |
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| 58 | BootMenu_GetDriveToDXforMenuitemInCX: |
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| 59 | cmp cl, NO_ITEM_HIGHLIGHTED |
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| 60 | je SHORT .ReturnFloppyDriveInDX ; Clear CF if branch taken |
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| 61 | |
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| 62 | mov dl, cl ; Copy menuitem index to DX |
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| 63 | call FloppyDrive_GetCountToAX |
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| 64 | cmp dl, al ; Floppy drive? |
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| 65 | jb SHORT .ReturnFloppyDriveInDX ; Set CF if branch taken |
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| 66 | or al, 80h ; Or 80h into AL before the sub |
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| 67 | ; to cause CF to be set after |
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| 68 | ; and result has high order bit set |
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| 69 | sub dl, al ; Remove floppy drives from index |
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| 70 | |
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| 71 | .ReturnFloppyDriveInDX: |
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| 72 | ret |
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