[90] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Functions for initializing the BIOS. |
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| 3 | |
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[376] | 4 | ; |
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[526] | 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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[376] | 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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[526] | 12 | ; |
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[376] | 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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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 18 | ; |
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[376] | 19 | |
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[3] | 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 | ; Initializes the BIOS. |
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| 25 | ; This function is called from main BIOS ROM search routine. |
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| 26 | ; |
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| 27 | ; Initialize_FromMainBiosRomSearch |
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| 28 | ; Parameters: |
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| 29 | ; Nothing |
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| 30 | ; Returns: |
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| 31 | ; Nothing |
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| 32 | ; Corrupts registers: |
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| 33 | ; Nothing |
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| 34 | ;-------------------------------------------------------------------- |
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[413] | 35 | Initialize_FromMainBiosRomSearch: ; unused entrypoint ok |
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| 36 | pushf ; To store IF |
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[558] | 37 | sti ; Enable interrupts for keystrokes |
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[3] | 38 | push ds |
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| 39 | |
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[556] | 40 | %ifdef USE_AT |
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[413] | 41 | push BYTE 0 |
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| 42 | pop ds |
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[556] | 43 | %else |
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| 44 | push ax ; We use AX to install very late init handler |
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| 45 | LOAD_BDA_SEGMENT_TO ds, ax |
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[413] | 46 | %endif |
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| 47 | |
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| 48 | test BYTE [BDA.bKBFlgs1], (1<<2) ; Clears ZF if CTRL is held down |
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[90] | 49 | jnz SHORT .SkipRomInitialization |
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[3] | 50 | |
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[229] | 51 | ; Install INT 19h handler (boot loader) where drives are detected |
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[413] | 52 | mov WORD [BIOS_BOOT_LOADER_INTERRUPT_19h*4], Int19h_BootLoaderHandler |
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| 53 | mov [BIOS_BOOT_LOADER_INTERRUPT_19h*4+2], cs |
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[229] | 54 | |
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[556] | 55 | ; Very late initialization for XT builds only |
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| 56 | %ifndef USE_AT |
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| 57 | push es |
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[553] | 58 | ; Install special INT 13h hander that initializes XTIDE Universal BIOS |
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[552] | 59 | ; when our INT 19h is not called |
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| 60 | les ax, [BIOS_DISK_INTERRUPT_13h*4] ; Load system INT 13h handler |
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| 61 | mov [TEMPORARY_VECTOR_FOR_SYSTEM_INT13h*4], ax |
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| 62 | mov [TEMPORARY_VECTOR_FOR_SYSTEM_INT13h*4+2], es |
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| 63 | mov WORD [BIOS_DISK_INTERRUPT_13h*4], Int13hBiosInit_Handler |
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| 64 | mov [BIOS_DISK_INTERRUPT_13h*4+2], cs |
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[556] | 65 | pop es |
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| 66 | %endif |
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[552] | 67 | |
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[90] | 68 | .SkipRomInitialization: |
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[556] | 69 | %ifndef USE_AT |
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[413] | 70 | pop ax |
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| 71 | %endif |
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[3] | 72 | pop ds |
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| 73 | popf |
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| 74 | retf |
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| 75 | |
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| 76 | |
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| 77 | ;-------------------------------------------------------------------- |
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| 78 | ; Initializes the BIOS variables and detects IDE drives. |
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| 79 | ; |
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| 80 | ; Initialize_AndDetectDrives |
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| 81 | ; Parameters: |
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[90] | 82 | ; ES: BDA Segment |
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[3] | 83 | ; Returns: |
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[97] | 84 | ; DS: RAMVARS segment |
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[3] | 85 | ; Corrupts registers: |
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[413] | 86 | ; All, except ES |
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[3] | 87 | ;-------------------------------------------------------------------- |
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| 88 | Initialize_AndDetectDrives: |
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[392] | 89 | call DetectPrint_InitializeDisplayContext |
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[3] | 90 | call DetectPrint_RomFoundAtSegment |
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| 91 | call RamVars_Initialize |
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[392] | 92 | call BootVars_Initialize |
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[551] | 93 | call Interrupts_InitializeInterruptVectors ; HotkeyBar requires INT 40h so install handlers before drive detection |
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[431] | 94 | call DetectDrives_FromAllIDEControllers |
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[555] | 95 | mov [RAMVARS.wDrvDetectSignature], es ; No longer in drive detection mode (set normal timeouts) |
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[541] | 96 | ; Fall to .StoreDptPointersToIntVectors |
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| 97 | |
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| 98 | ;-------------------------------------------------------------------- |
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| 99 | ; .StoreDptPointersToIntVectors |
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| 100 | ; Parameters: |
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| 101 | ; DS: RAMVARS segment |
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| 102 | ; ES: BDA and interrupt vector segment (zero) |
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| 103 | ; Returns: |
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| 104 | ; Nothing |
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| 105 | ; Corrupts registers: |
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| 106 | ; AX, CX, DX, SI, DI |
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| 107 | ;-------------------------------------------------------------------- |
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[555] | 108 | %ifdef MODULE_COMPATIBLE_TABLES |
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[541] | 109 | .StoreDptPointersToIntVectors: |
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[542] | 110 | %ifndef USE_AT |
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| 111 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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| 112 | jz SHORT .CompatibleDPTsCreated ; Only Full operating mode has extra RAM to spare |
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| 113 | %endif |
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| 114 | |
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[541] | 115 | mov dl, 80h |
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| 116 | call FindDPT_ForDriveNumberInDL ; DPT to DS:DI |
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| 117 | jc SHORT .FindForDrive81h ; Store nothing if not our drive |
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| 118 | |
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| 119 | call CompatibleDPT_CreateToAXSIforDriveDL |
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| 120 | mov [es:HD0_DPT_POINTER_41h*4], si |
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| 121 | mov [es:HD0_DPT_POINTER_41h*4+2], ax |
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| 122 | |
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| 123 | .FindForDrive81h: |
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| 124 | mov dl, 81h |
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| 125 | call FindDPT_ForDriveNumberInDL |
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| 126 | jc SHORT .CompatibleDPTsCreated |
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| 127 | |
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| 128 | call CompatibleDPT_CreateToAXSIforDriveDL |
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| 129 | mov [es:HD1_DPT_POINTER_46h*4], si |
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| 130 | mov [es:HD1_DPT_POINTER_46h*4+2], ax |
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| 131 | .CompatibleDPTsCreated: |
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[550] | 132 | %endif ; MODULE_COMPATIBLE_TABLES |
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[150] | 133 | ret |
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