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_DisplayAndStoreSelection
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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 | ; Returns:
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55 | ; DX: Drive number to be used for booting
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56 | ; DS: RAMVARS segment
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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, DI
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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 | ; through 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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