source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/Initialize.asm@ 365

Last change on this file since 365 was 363, checked in by aitotat@…, 13 years ago

Changes to XTIDE Universal BIOS:

  • Added Advanced ATA Module (MODULE_ADVANCED_ATA) with native support for QDI Vision QD6500 and QD6580 VLB IDE Controllers.
  • Hopefully optimized IDE transfer functions for 8088 (replaced some memory accesses from WORD to BYTE).
  • XT build does not fit in 8k at the moment!!!
File size: 2.9 KB
RevLine 
[90]1; Project name : XTIDE Universal BIOS
[3]2; Description : Functions for initializing the BIOS.
3
4; Section containing code
5SECTION .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;--------------------------------------------------------------------
[229]19Initialize_FromMainBiosRomSearch: ; unused entrypoint ok
[3]20 pushf
21 push es
22 push ds
23 ePUSHA
24
[90]25 LOAD_BDA_SEGMENT_TO es, ax
[229]26 sti ; Enable interrupts
27 test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clears ZF if CTRL is held down
[90]28 jnz SHORT .SkipRomInitialization
[3]29
[229]30 ; Install INT 19h handler (boot loader) where drives are detected
[258]31 mov al, BIOS_BOOT_LOADER_INTERRUPT_19h
[243]32 mov si, Int19h_BootLoaderHandler
[258]33 call Interrupts_InstallHandlerToVectorInALFromCSSI
[229]34
[90]35.SkipRomInitialization:
[3]36 ePOPA
37 pop ds
38 pop es
39 popf
40 retf
41
42
43;--------------------------------------------------------------------
44; Initializes the BIOS variables and detects IDE drives.
45;
46; Initialize_AndDetectDrives
47; Parameters:
[90]48; ES: BDA Segment
[3]49; Returns:
[97]50; DS: RAMVARS segment
[3]51; Corrupts registers:
[97]52; All
[3]53;--------------------------------------------------------------------
54Initialize_AndDetectDrives:
[363]55 mov WORD [es:BOOTVARS.wMagicWord], BOOTVARS_MAGIC_WORD
[130]56 call BootMenuPrint_InitializeDisplayContext
[3]57 call DetectPrint_RomFoundAtSegment
58 call RamVars_Initialize
[33]59 call Interrupts_InitializeInterruptVectors
[3]60 call DetectDrives_FromAllIDEControllers
[98]61 ; Fall to .StoreDptPointersToIntVectors
[97]62
63;--------------------------------------------------------------------
[98]64; .StoreDptPointersToIntVectors
[97]65; Parameters:
66; DS: RAMVARS segment
67; ES: BDA and interrupt vector segment (zero)
68; Returns:
69; Nothing
70; Corrupts registers:
71; DX, DI
72;--------------------------------------------------------------------
[98]73.StoreDptPointersToIntVectors:
[97]74 mov dl, 80h
[262]75 call FindDPT_ForDriveNumberInDL ; DPT to DS:DI
[258]76 jc SHORT .FindForDrive81h ; Store nothing if not our drive
[152]77 mov [es:HD0_DPT_POINTER_41h*4], di
78 mov [es:HD0_DPT_POINTER_41h*4+2], ds
[97]79.FindForDrive81h:
80 inc dx
[262]81 call FindDPT_ForDriveNumberInDL
[258]82 jc SHORT .ResetDetectedDrives
[152]83 mov [es:HD1_DPT_POINTER_46h*4], di
84 mov [es:HD1_DPT_POINTER_46h*4+2], ds
[33]85 ; Fall to .ResetDetectedDrives
[3]86
87;--------------------------------------------------------------------
[97]88; .ResetDetectedDrives
[3]89; Parameters:
90; DS: RAMVARS segment
[243]91; ES: BDA and interrupt vector segment (zero)
[3]92; Returns:
93; Nothing
94; Corrupts registers:
[243]95; All, except DS and ES
[3]96;--------------------------------------------------------------------
[33]97.ResetDetectedDrives:
[150]98 call Idepack_FakeToSSBP
[271]99 call AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization
[158]100 add sp, BYTE EXTRA_BYTES_FOR_INTPACK
[363]101 mov WORD [es:BOOTVARS.wMagicWord], 0
[150]102 ret
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