| [90] | 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| [3] | 2 | ; Description : Functions for initializing the BIOS.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; Initializes the BIOS.
|
|---|
| 9 | ; This function is called from main BIOS ROM search routine.
|
|---|
| 10 | ;
|
|---|
| 11 | ; Initialize_FromMainBiosRomSearch
|
|---|
| 12 | ; Parameters:
|
|---|
| 13 | ; Nothing
|
|---|
| 14 | ; Returns:
|
|---|
| 15 | ; Nothing
|
|---|
| 16 | ; Corrupts registers:
|
|---|
| 17 | ; Nothing
|
|---|
| 18 | ;--------------------------------------------------------------------
|
|---|
| 19 | Initialize_FromMainBiosRomSearch:
|
|---|
| 20 | pushf
|
|---|
| 21 | push es
|
|---|
| 22 | push ds
|
|---|
| 23 | ePUSHA
|
|---|
| 24 |
|
|---|
| [90] | 25 | LOAD_BDA_SEGMENT_TO es, ax
|
|---|
| [3] | 26 | call Initialize_ShouldSkip
|
|---|
| [90] | 27 | jnz SHORT .SkipRomInitialization
|
|---|
| [3] | 28 |
|
|---|
| [90] | 29 | %ifdef USE_AT ; Early initialization on AT build
|
|---|
| 30 | call Initialize_AndDetectDrives
|
|---|
| 31 | %else ; Late initialization on XT builds
|
|---|
| 32 | call Int19hLate_InitializeInt19h
|
|---|
| 33 | %endif
|
|---|
| 34 | .SkipRomInitialization:
|
|---|
| [3] | 35 | ePOPA
|
|---|
| 36 | pop ds
|
|---|
| 37 | pop es
|
|---|
| 38 | popf
|
|---|
| 39 | retf
|
|---|
| 40 |
|
|---|
| 41 |
|
|---|
| 42 | ;--------------------------------------------------------------------
|
|---|
| 43 | ; Checks if user wants to skip ROM initialization.
|
|---|
| 44 | ;
|
|---|
| 45 | ; Initialize_ShouldSkip
|
|---|
| 46 | ; Parameters:
|
|---|
| [90] | 47 | ; ES: BDA segment
|
|---|
| [3] | 48 | ; Returns:
|
|---|
| [90] | 49 | ; ZF: Cleared if ROM initialization is to be skipped
|
|---|
| 50 | ; Set to continue ROM initialization
|
|---|
| [3] | 51 | ; Corrupts registers:
|
|---|
| [90] | 52 | ; Nothing
|
|---|
| [3] | 53 | ;--------------------------------------------------------------------
|
|---|
| 54 | Initialize_ShouldSkip:
|
|---|
| [90] | 55 | sti ; Enable interrupts
|
|---|
| 56 | test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clear ZF if CTRL is held down
|
|---|
| [3] | 57 | ret
|
|---|
| 58 |
|
|---|
| 59 |
|
|---|
| 60 | ;--------------------------------------------------------------------
|
|---|
| 61 | ; Initializes the BIOS variables and detects IDE drives.
|
|---|
| 62 | ;
|
|---|
| 63 | ; Initialize_AndDetectDrives
|
|---|
| 64 | ; Parameters:
|
|---|
| [90] | 65 | ; ES: BDA Segment
|
|---|
| [3] | 66 | ; Returns:
|
|---|
| [97] | 67 | ; DS: RAMVARS segment
|
|---|
| [3] | 68 | ; Corrupts registers:
|
|---|
| [97] | 69 | ; All
|
|---|
| [3] | 70 | ;--------------------------------------------------------------------
|
|---|
| 71 | Initialize_AndDetectDrives:
|
|---|
| [120] | 72 | CALL_DISPLAY_LIBRARY InitializeDisplayContext
|
|---|
| [3] | 73 | call DetectPrint_RomFoundAtSegment
|
|---|
| 74 | call RamVars_Initialize
|
|---|
| [33] | 75 | call Interrupts_InitializeInterruptVectors
|
|---|
| [3] | 76 | call DetectDrives_FromAllIDEControllers
|
|---|
| [98] | 77 | ; Fall to .StoreDptPointersToIntVectors
|
|---|
| [97] | 78 |
|
|---|
| 79 | ;--------------------------------------------------------------------
|
|---|
| [98] | 80 | ; .StoreDptPointersToIntVectors
|
|---|
| [97] | 81 | ; Parameters:
|
|---|
| 82 | ; DS: RAMVARS segment
|
|---|
| 83 | ; ES: BDA and interrupt vector segment (zero)
|
|---|
| 84 | ; Returns:
|
|---|
| 85 | ; Nothing
|
|---|
| 86 | ; Corrupts registers:
|
|---|
| 87 | ; DX, DI
|
|---|
| 88 | ;--------------------------------------------------------------------
|
|---|
| [98] | 89 | .StoreDptPointersToIntVectors:
|
|---|
| [97] | 90 | mov dl, 80h
|
|---|
| 91 | call FindDPT_ForDriveNumber ; DPT to DS:DI
|
|---|
| 92 | jnc SHORT .FindForDrive81h ; Store nothing if not our drive
|
|---|
| 93 | mov [es:INTV_HD0DPT*4], di
|
|---|
| 94 | mov [es:INTV_HD0DPT*4+2], ds
|
|---|
| 95 | .FindForDrive81h:
|
|---|
| 96 | inc dx
|
|---|
| 97 | call FindDPT_ForDriveNumber
|
|---|
| 98 | jnc SHORT .ResetDetectedDrives
|
|---|
| 99 | mov [es:INTV_HD1DPT*4], di
|
|---|
| 100 | mov [es:INTV_HD1DPT*4+2], ds
|
|---|
| [33] | 101 | ; Fall to .ResetDetectedDrives
|
|---|
| [3] | 102 |
|
|---|
| 103 | ;--------------------------------------------------------------------
|
|---|
| [97] | 104 | ; .ResetDetectedDrives
|
|---|
| [3] | 105 | ; Parameters:
|
|---|
| 106 | ; DS: RAMVARS segment
|
|---|
| 107 | ; Returns:
|
|---|
| 108 | ; Nothing
|
|---|
| 109 | ; Corrupts registers:
|
|---|
| 110 | ; AX, BX, CX, DX, DI
|
|---|
| 111 | ;--------------------------------------------------------------------
|
|---|
| [33] | 112 | .ResetDetectedDrives:
|
|---|
| [27] | 113 | jmp AH0h_ResetHardDisksHandledByOurBIOS
|
|---|
