| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for initializing the BIOS.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Initializes the BIOS.
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| 9 | ; This function is called from main BIOS ROM search routine.
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| 10 | ;
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| 11 | ; Initialize_FromMainBiosRomSearch
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| 12 | ; Parameters:
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| 13 | ; Nothing
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| 14 | ; Returns:
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| 15 | ; Nothing
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| 16 | ; Corrupts registers:
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| 17 | ; Nothing
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| 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| 20 | Initialize_FromMainBiosRomSearch:
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| 21 | pushf
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| 22 | push es
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| 23 | push ds
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| 24 | ePUSHA
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| 25 |
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| 26 | LOAD_BDA_SEGMENT_TO es, ax
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| 27 | call Initialize_ShouldSkip
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| 28 | jnz SHORT .SkipRomInitialization
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| 29 |
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| 30 | %ifdef USE_AT ; Early initialization on AT build
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| 31 | call Initialize_AndDetectDrives
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| 32 | %else ; Late initialization on XT builds
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| 33 | call Int19hLate_InitializeInt19h
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| 34 | %endif
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| 35 | .SkipRomInitialization:
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| 36 | ePOPA
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| 37 | pop ds
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| 38 | pop es
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| 39 | popf
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| 40 | retf
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| 41 |
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| 42 |
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| 43 | ;--------------------------------------------------------------------
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| 44 | ; Checks if user wants to skip ROM initialization.
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| 45 | ;
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| 46 | ; Initialize_ShouldSkip
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| 47 | ; Parameters:
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| 48 | ; ES: BDA segment
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| 49 | ; Returns:
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| 50 | ; ZF: Cleared if ROM initialization is to be skipped
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| 51 | ; Set to continue ROM initialization
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| 52 | ; Corrupts registers:
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| 53 | ; Nothing
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| 54 | ;--------------------------------------------------------------------
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| 55 | ALIGN JUMP_ALIGN
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| 56 | Initialize_ShouldSkip:
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| 57 | sti ; Enable interrupts
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| 58 | test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clear ZF if CTRL is held down
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| 59 | ret
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| 60 |
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| 61 |
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| 62 | ;--------------------------------------------------------------------
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| 63 | ; Initializes the BIOS variables and detects IDE drives.
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| 64 | ;
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| 65 | ; Initialize_AndDetectDrives
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| 66 | ; Parameters:
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| 67 | ; ES: BDA Segment
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| 68 | ; Returns:
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| 69 | ; Nothing
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| 70 | ; Corrupts registers:
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| 71 | ; All, including segments
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| 72 | ;--------------------------------------------------------------------
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| 73 | ALIGN JUMP_ALIGN
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| 74 | Initialize_AndDetectDrives:
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| 75 | call DetectPrint_RomFoundAtSegment
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| 76 | call RamVars_Initialize
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| 77 | call RamVars_GetSegmentToDS
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| 78 | call Interrupts_InitializeInterruptVectors
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| 79 | call DetectDrives_FromAllIDEControllers
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| 80 | call CompatibleDPT_CreateForDrives80hAnd81h
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| 81 | ; Fall to .ResetDetectedDrives
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| 82 |
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| 83 | ;--------------------------------------------------------------------
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| 84 | ; Resets all hard disks.
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| 85 | ;
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| 86 | ; Initialize_ResetDetectedDrives
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| 87 | ; Parameters:
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| 88 | ; DS: RAMVARS segment
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| 89 | ; Returns:
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| 90 | ; Nothing
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| 91 | ; Corrupts registers:
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| 92 | ; AX, BX, CX, DX, DI
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| 93 | ;--------------------------------------------------------------------
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| 94 | ;ALIGN JUMP_ALIGN
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| 95 | .ResetDetectedDrives:
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| 96 | jmp AH0h_ResetHardDisksHandledByOurBIOS
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