| [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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| 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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| [229] | 19 | Initialize_FromMainBiosRomSearch: ; unused entrypoint ok
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| [3] | 20 | pushf
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| 21 | push es
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| 22 | push ds
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| 23 | ePUSHA
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| 24 |
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| [90] | 25 | LOAD_BDA_SEGMENT_TO es, ax
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| [229] | 26 | sti ; Enable interrupts
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| 27 | test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clears ZF if CTRL is held down
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| [90] | 28 | jnz SHORT .SkipRomInitialization
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| [3] | 29 |
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| [229] | 30 | ; Install INT 19h handler (boot loader) where drives are detected
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| [258] | 31 | mov al, BIOS_BOOT_LOADER_INTERRUPT_19h
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| [243] | 32 | mov si, Int19h_BootLoaderHandler
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| [258] | 33 | call Interrupts_InstallHandlerToVectorInALFromCSSI
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| [229] | 34 |
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| [90] | 35 | .SkipRomInitialization:
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| [3] | 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 | ; Initializes the BIOS variables and detects IDE drives.
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| 45 | ;
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| 46 | ; Initialize_AndDetectDrives
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| 47 | ; Parameters:
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| [90] | 48 | ; ES: BDA Segment
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| [3] | 49 | ; Returns:
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| [97] | 50 | ; DS: RAMVARS segment
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| [3] | 51 | ; Corrupts registers:
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| [97] | 52 | ; All
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| [3] | 53 | ;--------------------------------------------------------------------
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| 54 | Initialize_AndDetectDrives:
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| [130] | 55 | call BootMenuPrint_InitializeDisplayContext
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| [3] | 56 | call DetectPrint_RomFoundAtSegment
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| 57 | call RamVars_Initialize
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| [33] | 58 | call Interrupts_InitializeInterruptVectors
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| [3] | 59 | call DetectDrives_FromAllIDEControllers
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| [98] | 60 | ; Fall to .StoreDptPointersToIntVectors
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| [97] | 61 |
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| 62 | ;--------------------------------------------------------------------
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| [98] | 63 | ; .StoreDptPointersToIntVectors
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| [97] | 64 | ; Parameters:
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| 65 | ; DS: RAMVARS segment
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| 66 | ; ES: BDA and interrupt vector segment (zero)
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| 67 | ; Returns:
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| 68 | ; Nothing
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| 69 | ; Corrupts registers:
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| 70 | ; DX, DI
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| 71 | ;--------------------------------------------------------------------
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| [98] | 72 | .StoreDptPointersToIntVectors:
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| [97] | 73 | mov dl, 80h
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| [262] | 74 | call FindDPT_ForDriveNumberInDL ; DPT to DS:DI
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| [258] | 75 | jc SHORT .FindForDrive81h ; Store nothing if not our drive
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| [152] | 76 | mov [es:HD0_DPT_POINTER_41h*4], di
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| 77 | mov [es:HD0_DPT_POINTER_41h*4+2], ds
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| [97] | 78 | .FindForDrive81h:
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| 79 | inc dx
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| [262] | 80 | call FindDPT_ForDriveNumberInDL
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| [258] | 81 | jc SHORT .ResetDetectedDrives
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| [152] | 82 | mov [es:HD1_DPT_POINTER_46h*4], di
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| 83 | mov [es:HD1_DPT_POINTER_46h*4+2], ds
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| [33] | 84 | ; Fall to .ResetDetectedDrives
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| [3] | 85 |
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| 86 | ;--------------------------------------------------------------------
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| [97] | 87 | ; .ResetDetectedDrives
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| [3] | 88 | ; Parameters:
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| 89 | ; DS: RAMVARS segment
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| [243] | 90 | ; ES: BDA and interrupt vector segment (zero)
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| [3] | 91 | ; Returns:
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| 92 | ; Nothing
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| 93 | ; Corrupts registers:
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| [243] | 94 | ; All, except DS and ES
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| [3] | 95 | ;--------------------------------------------------------------------
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| [33] | 96 | .ResetDetectedDrives:
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| [150] | 97 | call Idepack_FakeToSSBP
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| [271] | 98 | call AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization
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| [158] | 99 | add sp, BYTE EXTRA_BYTES_FOR_INTPACK
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| [150] | 100 | ret
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