| 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Functions for initializing the BIOS.
|
|---|
| 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 | ; 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 | ;--------------------------------------------------------------------
|
|---|
| 35 | Initialize_FromMainBiosRomSearch: ; unused entrypoint ok
|
|---|
| 36 | pushf ; To store IF
|
|---|
| 37 | push ds
|
|---|
| 38 |
|
|---|
| 39 | %ifndef USE_186
|
|---|
| 40 | push ax
|
|---|
| 41 | LOAD_BDA_SEGMENT_TO ds, ax
|
|---|
| 42 | %else
|
|---|
| 43 | push BYTE 0
|
|---|
| 44 | pop ds
|
|---|
| 45 | %endif
|
|---|
| 46 |
|
|---|
| 47 | sti ; Enable interrupts for keystrokes
|
|---|
| 48 | test BYTE [BDA.bKBFlgs1], (1<<2) ; Clears ZF if CTRL is held down
|
|---|
| 49 | jnz SHORT .SkipRomInitialization
|
|---|
| 50 |
|
|---|
| 51 | ; Install INT 19h handler (boot loader) where drives are detected
|
|---|
| 52 | mov WORD [BIOS_BOOT_LOADER_INTERRUPT_19h*4], Int19h_BootLoaderHandler
|
|---|
| 53 | mov [BIOS_BOOT_LOADER_INTERRUPT_19h*4+2], cs
|
|---|
| 54 |
|
|---|
| 55 | .SkipRomInitialization:
|
|---|
| 56 | %ifndef USE_186
|
|---|
| 57 | pop ax
|
|---|
| 58 | %endif
|
|---|
| 59 | pop ds
|
|---|
| 60 | popf
|
|---|
| 61 | retf
|
|---|
| 62 |
|
|---|
| 63 |
|
|---|
| 64 | ;--------------------------------------------------------------------
|
|---|
| 65 | ; Initializes the BIOS variables and detects IDE drives.
|
|---|
| 66 | ;
|
|---|
| 67 | ; Initialize_AndDetectDrives
|
|---|
| 68 | ; Parameters:
|
|---|
| 69 | ; ES: BDA Segment
|
|---|
| 70 | ; Returns:
|
|---|
| 71 | ; DS: RAMVARS segment
|
|---|
| 72 | ; Corrupts registers:
|
|---|
| 73 | ; All, except ES
|
|---|
| 74 | ;--------------------------------------------------------------------
|
|---|
| 75 | Initialize_AndDetectDrives:
|
|---|
| 76 | call DetectPrint_InitializeDisplayContext
|
|---|
| 77 | call DetectPrint_RomFoundAtSegment
|
|---|
| 78 | call RamVars_Initialize
|
|---|
| 79 | call BootVars_Initialize
|
|---|
| 80 | call Interrupts_InitializeInterruptVectors
|
|---|
| 81 | call DetectDrives_FromAllIDEControllers
|
|---|
| 82 | ; Fall to .StoreDptPointersToIntVectors
|
|---|
| 83 |
|
|---|
| 84 | ;--------------------------------------------------------------------
|
|---|
| 85 | ; .StoreDptPointersToIntVectors
|
|---|
| 86 | ; Parameters:
|
|---|
| 87 | ; DS: RAMVARS segment
|
|---|
| 88 | ; ES: BDA and interrupt vector segment (zero)
|
|---|
| 89 | ; Returns:
|
|---|
| 90 | ; Nothing
|
|---|
| 91 | ; Corrupts registers:
|
|---|
| 92 | ; DX, DI
|
|---|
| 93 | ;--------------------------------------------------------------------
|
|---|
| 94 | .StoreDptPointersToIntVectors:
|
|---|
| 95 | mov dl, 80h
|
|---|
| 96 | call FindDPT_ForDriveNumberInDL ; DPT to DS:DI
|
|---|
| 97 | jc SHORT .FindForDrive81h ; Store nothing if not our drive
|
|---|
| 98 | mov [es:HD0_DPT_POINTER_41h*4], di
|
|---|
| 99 | mov [es:HD0_DPT_POINTER_41h*4+2], ds
|
|---|
| 100 | .FindForDrive81h:
|
|---|
| 101 | inc dx
|
|---|
| 102 | call FindDPT_ForDriveNumberInDL
|
|---|
| 103 | jc SHORT .ResetDetectedDrives
|
|---|
| 104 | mov [es:HD1_DPT_POINTER_46h*4], di
|
|---|
| 105 | mov [es:HD1_DPT_POINTER_46h*4+2], ds
|
|---|
| 106 | ; Fall to .ResetDetectedDrives
|
|---|
| 107 |
|
|---|
| 108 | ;--------------------------------------------------------------------
|
|---|
| 109 | ; .ResetDetectedDrives
|
|---|
| 110 | ; Parameters:
|
|---|
| 111 | ; DS: RAMVARS segment
|
|---|
| 112 | ; ES: BDA and interrupt vector segment (zero)
|
|---|
| 113 | ; Returns:
|
|---|
| 114 | ; Nothing
|
|---|
| 115 | ; Corrupts registers:
|
|---|
| 116 | ; All, except DS and ES
|
|---|
| 117 | ;--------------------------------------------------------------------
|
|---|
| 118 | .ResetDetectedDrives:
|
|---|
| 119 | call Idepack_FakeToSSBP
|
|---|
| 120 | call AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization
|
|---|
| 121 | add sp, BYTE EXTRA_BYTES_FOR_INTPACK
|
|---|
| 122 | ret
|
|---|
