| [3] | 1 | ; File name : Initialize.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 23.3.2010
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| [33] | 4 | ; Last update : 23.8.2010
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| [3] | 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for initializing the BIOS.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Initializes the BIOS.
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| 13 | ; This function is called from main BIOS ROM search routine.
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| 14 | ;
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| 15 | ; Initialize_FromMainBiosRomSearch
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| 16 | ; Parameters:
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| 17 | ; Nothing
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| 18 | ; Returns:
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| 19 | ; Nothing
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| 20 | ; Corrupts registers:
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| 21 | ; Nothing
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | Initialize_FromMainBiosRomSearch:
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| 25 | pushf
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| 26 | push es
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| 27 | push ds
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| 28 | ePUSHA
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| 29 |
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| 30 | call Initialize_ShouldSkip
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| 31 | jc SHORT .ReturnFromRomInit
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| 32 |
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| 33 | ePUSH_T ax, .ReturnFromRomInit ; Push return address
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| 34 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_LATE
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| 35 | jnz SHORT Initialize_PrepareLateInitialization
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| 36 | jmp SHORT Initialize_AndDetectDrives
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| 37 |
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| 38 | ALIGN JUMP_ALIGN
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| 39 | .ReturnFromRomInit:
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| 40 | ePOPA
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| 41 | pop ds
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| 42 | pop es
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| 43 | popf
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| 44 | retf
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| 45 |
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| 46 |
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| 47 | ;--------------------------------------------------------------------
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| 48 | ; Checks if user wants to skip ROM initialization.
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| 49 | ;
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| 50 | ; Initialize_ShouldSkip
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| 51 | ; Parameters:
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| 52 | ; Nothing
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| 53 | ; Returns:
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| 54 | ; CF: Set if ROM initialization is to be skipped
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| 55 | ; Cleared to continue ROM initialization
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| 56 | ; Corrupts registers:
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| 57 | ; AX, DS
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| 58 | ;--------------------------------------------------------------------
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| 59 | ALIGN JUMP_ALIGN
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| 60 | Initialize_ShouldSkip:
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| 61 | sti ; Enable interrupts
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| 62 | LOAD_BDA_SEGMENT_TO ds, ax
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| 63 | mov al, [BDA.bKBFlgs1] ; Load shift flags
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| 64 | eSHR_IM al, 3 ; Set CF if CTRL is held down
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| 65 | ret
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| 66 |
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| 67 |
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| 68 | ;--------------------------------------------------------------------
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| 69 | ; Installs INT 19h boot loader handler for late initialization.
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| 70 | ;
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| 71 | ; Initialize_PrepareLateInitialization
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| 72 | ; Parameters:
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| 73 | ; Nothing
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| 74 | ; Returns:
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| 75 | ; Nothing
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| 76 | ; Corrupts registers:
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| 77 | ; BX, SI, ES
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| 78 | ;--------------------------------------------------------------------
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| 79 | ALIGN JUMP_ALIGN
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| 80 | Initialize_PrepareLateInitialization:
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| 81 | LOAD_BDA_SEGMENT_TO es, bx
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| 82 | mov bl, INTV_BOOTSTRAP
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| 83 | mov si, Int19h_LateInitialization
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| [33] | 84 | jmp Interrupts_InstallHandlerToVectorInBXFromCSSI
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| [3] | 85 |
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| 86 |
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| 87 | ;--------------------------------------------------------------------
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| 88 | ; Initializes the BIOS variables and detects IDE drives.
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| 89 | ;
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| 90 | ; Initialize_AndDetectDrives
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| 91 | ; Parameters:
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| 92 | ; Nothing
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| 93 | ; Returns:
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| 94 | ; Nothing
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| 95 | ; Corrupts registers:
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| 96 | ; All, including segments
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| 97 | ;--------------------------------------------------------------------
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| 98 | ALIGN JUMP_ALIGN
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| 99 | Initialize_AndDetectDrives:
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| 100 | call DetectPrint_RomFoundAtSegment
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| 101 | call RamVars_Initialize
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| 102 | call RamVars_GetSegmentToDS
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| 103 | LOAD_BDA_SEGMENT_TO es, ax
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| [33] | 104 | call Interrupts_InitializeInterruptVectors
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| [3] | 105 | call DetectDrives_FromAllIDEControllers
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| 106 | call CompatibleDPT_CreateForDrives80hAnd81h
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| [33] | 107 | ; Fall to .ResetDetectedDrives
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| [3] | 108 |
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| 109 | ;--------------------------------------------------------------------
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| 110 | ; Resets all hard disks.
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| 111 | ;
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| 112 | ; Initialize_ResetDetectedDrives
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| 113 | ; Parameters:
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| 114 | ; DS: RAMVARS segment
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| 115 | ; Returns:
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| 116 | ; Nothing
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| 117 | ; Corrupts registers:
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| 118 | ; AX, BX, CX, DX, DI
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| 119 | ;--------------------------------------------------------------------
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| [33] | 120 | ;ALIGN JUMP_ALIGN
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| 121 | .ResetDetectedDrives:
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| [27] | 122 | jmp AH0h_ResetHardDisksHandledByOurBIOS
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