1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Functions for accessings BOOTVARS. |
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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 | ; BootVars_Initialize |
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25 | ; Parameters: |
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26 | ; DS: RAMVARS Segment |
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27 | ; ES: BDA Segment |
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28 | ; Returns: |
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29 | ; Nothing |
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30 | ; Corrupts registers: |
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31 | ; AX, CX, DX, DI |
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32 | ;-------------------------------------------------------------------- |
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33 | BootVars_Initialize: |
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34 | ; Clear all DRVDETECTINFO structs to zero |
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35 | mov al, DRVDETECTINFO_size |
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36 | mul BYTE [cs:ROMVARS.bIdeCnt] |
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37 | xchg cx, ax |
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38 | %ifndef MODULE_HOTKEYS |
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39 | mov di, BOOTVARS.rgDrvDetectInfo ; We must not initialize anything before this! |
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40 | jmp Memory_ZeroESDIwithSizeInCX |
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41 | |
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42 | %else ; if MODULE_HOTKEYS |
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43 | ; Also zero HOTKEYVARS located above DRVDETECTINFO structs |
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44 | mov di, BOOTVARS.hotkeyVars |
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45 | add cx, BYTE HOTKEYVARS_size |
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46 | call Memory_ZeroESDIwithSizeInCX |
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47 | |
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48 | ; Store time when hotkeybar is displayed |
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49 | ; (it will be displayed after initialization is complete) |
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50 | call TimerTicks_ReadFromBdaToAX |
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51 | mov [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wTimeWhenDisplayed], ax |
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52 | |
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53 | ; Initialize HOTKEYVARS by storing default drives to boot from |
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54 | call BootVars_StoreDefaultDriveLettersToHotkeyVars |
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55 | mov dl, [cs:ROMVARS.bBootDrv] |
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56 | jmp HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL |
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57 | |
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58 | |
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59 | ;-------------------------------------------------------------------- |
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60 | ; BootVars_StoreDefaultDriveLettersToHotkeyVars |
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61 | ; Parameters: |
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62 | ; ES: BDA Segment |
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63 | ; Returns: |
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64 | ; Nothing |
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65 | ; Corrupts registers: |
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66 | ; Nothing |
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67 | ;-------------------------------------------------------------------- |
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68 | BootVars_StoreDefaultDriveLettersToHotkeyVars: |
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69 | call BootVars_GetLetterForFirstHardDriveToAX |
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70 | mov ah, DEFAULT_FLOPPY_DRIVE_LETTER |
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71 | xchg al, ah |
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72 | mov [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters], ax |
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73 | ret |
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74 | |
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75 | %endif ; MODULE_HOTKEYS |
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76 | |
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77 | |
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78 | ;-------------------------------------------------------------------- |
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79 | ; Returns letter for first hard disk. Usually it will be 'C' but it |
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80 | ; can be higher if more than two floppy drives are found. |
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81 | ; |
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82 | ; BootVars_GetLetterForFirstHardDriveToAX |
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83 | ; Parameters: |
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84 | ; DS: RAMVARS segment |
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85 | ; Returns: |
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86 | ; AX: Upper case letter for first hard disk |
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87 | ; Corrupts registers: |
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88 | ; Nothing |
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89 | ;-------------------------------------------------------------------- |
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90 | BootVars_GetLetterForFirstHardDriveToAX: |
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91 | call FloppyDrive_GetCountToAX |
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92 | add al, DEFAULT_FLOPPY_DRIVE_LETTER ; First Hard Drive letter comes after last floppy drive letter... |
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93 | MAX_U al, DEFAULT_HARD_DRIVE_LETTER ; ...but it can never be 'A' or 'B' |
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94 | ret |
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