[90] | 1 | ; Project name : XTIDE Universal BIOS |
---|
[3] | 2 | ; Description : Functions for initializing the BIOS. |
---|
| 3 | |
---|
[376] | 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 | |
---|
[3] | 20 | ; Section containing code |
---|
| 21 | SECTION .text |
---|
| 22 | |
---|
| 23 | ;-------------------------------------------------------------------- |
---|
| 24 | ; Initializes the BIOS. |
---|
| 25 | ; This function is called from main BIOS ROM search routine. |
---|
| 26 | ; |
---|
| 27 | ; Initialize_FromMainBiosRomSearch |
---|
| 28 | ; Parameters: |
---|
| 29 | ; Nothing |
---|
| 30 | ; Returns: |
---|
| 31 | ; Nothing |
---|
| 32 | ; Corrupts registers: |
---|
| 33 | ; Nothing |
---|
| 34 | ;-------------------------------------------------------------------- |
---|
[229] | 35 | Initialize_FromMainBiosRomSearch: ; unused entrypoint ok |
---|
[3] | 36 | pushf |
---|
| 37 | push es |
---|
| 38 | push ds |
---|
| 39 | ePUSHA |
---|
| 40 | |
---|
[90] | 41 | LOAD_BDA_SEGMENT_TO es, ax |
---|
[229] | 42 | sti ; Enable interrupts |
---|
| 43 | test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clears ZF if CTRL is held down |
---|
[90] | 44 | jnz SHORT .SkipRomInitialization |
---|
[3] | 45 | |
---|
[229] | 46 | ; Install INT 19h handler (boot loader) where drives are detected |
---|
[258] | 47 | mov al, BIOS_BOOT_LOADER_INTERRUPT_19h |
---|
[243] | 48 | mov si, Int19h_BootLoaderHandler |
---|
[258] | 49 | call Interrupts_InstallHandlerToVectorInALFromCSSI |
---|
[229] | 50 | |
---|
[90] | 51 | .SkipRomInitialization: |
---|
[3] | 52 | ePOPA |
---|
| 53 | pop ds |
---|
| 54 | pop es |
---|
| 55 | popf |
---|
| 56 | retf |
---|
| 57 | |
---|
| 58 | |
---|
| 59 | ;-------------------------------------------------------------------- |
---|
| 60 | ; Initializes the BIOS variables and detects IDE drives. |
---|
| 61 | ; |
---|
| 62 | ; Initialize_AndDetectDrives |
---|
| 63 | ; Parameters: |
---|
[90] | 64 | ; ES: BDA Segment |
---|
[3] | 65 | ; Returns: |
---|
[97] | 66 | ; DS: RAMVARS segment |
---|
[3] | 67 | ; Corrupts registers: |
---|
[97] | 68 | ; All |
---|
[3] | 69 | ;-------------------------------------------------------------------- |
---|
| 70 | Initialize_AndDetectDrives: |
---|
[392] | 71 | call DetectPrint_InitializeDisplayContext |
---|
[3] | 72 | call DetectPrint_RomFoundAtSegment |
---|
| 73 | call RamVars_Initialize |
---|
[392] | 74 | call BootVars_Initialize |
---|
[33] | 75 | call Interrupts_InitializeInterruptVectors |
---|
[3] | 76 | call DetectDrives_FromAllIDEControllers |
---|
[98] | 77 | ; Fall to .StoreDptPointersToIntVectors |
---|
[97] | 78 | |
---|
| 79 | ;-------------------------------------------------------------------- |
---|
[98] | 80 | ; .StoreDptPointersToIntVectors |
---|
[97] | 81 | ; Parameters: |
---|
| 82 | ; DS: RAMVARS segment |
---|
| 83 | ; ES: BDA and interrupt vector segment (zero) |
---|
| 84 | ; Returns: |
---|
| 85 | ; Nothing |
---|
| 86 | ; Corrupts registers: |
---|
| 87 | ; DX, DI |
---|
| 88 | ;-------------------------------------------------------------------- |
---|
[98] | 89 | .StoreDptPointersToIntVectors: |
---|
[97] | 90 | mov dl, 80h |
---|
[262] | 91 | call FindDPT_ForDriveNumberInDL ; DPT to DS:DI |
---|
[258] | 92 | jc SHORT .FindForDrive81h ; Store nothing if not our drive |
---|
[152] | 93 | mov [es:HD0_DPT_POINTER_41h*4], di |
---|
| 94 | mov [es:HD0_DPT_POINTER_41h*4+2], ds |
---|
[97] | 95 | .FindForDrive81h: |
---|
| 96 | inc dx |
---|
[262] | 97 | call FindDPT_ForDriveNumberInDL |
---|
[258] | 98 | jc SHORT .ResetDetectedDrives |
---|
[152] | 99 | mov [es:HD1_DPT_POINTER_46h*4], di |
---|
| 100 | mov [es:HD1_DPT_POINTER_46h*4+2], ds |
---|
[33] | 101 | ; Fall to .ResetDetectedDrives |
---|
[3] | 102 | |
---|
| 103 | ;-------------------------------------------------------------------- |
---|
[97] | 104 | ; .ResetDetectedDrives |
---|
[3] | 105 | ; Parameters: |
---|
| 106 | ; DS: RAMVARS segment |
---|
[243] | 107 | ; ES: BDA and interrupt vector segment (zero) |
---|
[3] | 108 | ; Returns: |
---|
| 109 | ; Nothing |
---|
| 110 | ; Corrupts registers: |
---|
[243] | 111 | ; All, except DS and ES |
---|
[3] | 112 | ;-------------------------------------------------------------------- |
---|
[33] | 113 | .ResetDetectedDrives: |
---|
[150] | 114 | call Idepack_FakeToSSBP |
---|
[271] | 115 | call AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization |
---|
[158] | 116 | add sp, BYTE EXTRA_BYTES_FOR_INTPACK |
---|
[150] | 117 | ret |
---|