source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/Initialize.asm@ 219

Last change on this file since 219 was 194, checked in by gregli@…, 13 years ago

ifdef'd out more unused code. Also added a tool for looking through the listing and the output of the precompiler to aid in finding dead code. Some changes in the files are to add annotations for the tool to avoid false positives.
File size: 3.2 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;--------------------------------------------------------------------
[194]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
[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;--------------------------------------------------------------------
54Initialize_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;--------------------------------------------------------------------
71Initialize_AndDetectDrives:
[130]72 call BootMenuPrint_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
[152]91 call RamVars_IsDriveHandledByThisBIOS
92 jnc SHORT .FindForDrive81h ; Store nothing if not our drive
[97]93 call FindDPT_ForDriveNumber ; DPT to DS:DI
[152]94 mov [es:HD0_DPT_POINTER_41h*4], di
95 mov [es:HD0_DPT_POINTER_41h*4+2], ds
[97]96.FindForDrive81h:
97 inc dx
[152]98 call RamVars_IsDriveHandledByThisBIOS
99 jnc SHORT .ResetDetectedDrives
[97]100 call FindDPT_ForDriveNumber
[152]101 mov [es:HD1_DPT_POINTER_46h*4], di
102 mov [es:HD1_DPT_POINTER_46h*4+2], ds
[33]103 ; Fall to .ResetDetectedDrives
[3]104
105;--------------------------------------------------------------------
[97]106; .ResetDetectedDrives
[3]107; Parameters:
108; DS: RAMVARS segment
109; Returns:
110; Nothing
111; Corrupts registers:
[150]112; All
[3]113;--------------------------------------------------------------------
[33]114.ResetDetectedDrives:
[150]115 call Idepack_FakeToSSBP
116 call AH0h_ResetHardDisksHandledByOurBIOS
[158]117 add sp, BYTE EXTRA_BYTES_FOR_INTPACK
[150]118 ret
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