| 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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