source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/Initialize.asm@ 94

Last change on this file since 94 was 90, checked in by Tomi Tilli, 14 years ago

Changes to XTIDE Universal BIOS:

  • Removed INT 13h format and diagnostics functions.
  • Removed INT 18h callback handler.
  • Removed configuration for early/late initialization. Now XT builds always use late and AT build early initialization.
  • Reduced number of supported IDE controllers from 5 to 4.
  • Removed reserved configuration bytes.
  • Removed simple and system boot loaders.
File size: 2.5 KB
Line 
1; Project name : XTIDE Universal BIOS
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;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20Initialize_FromMainBiosRomSearch:
21 pushf
22 push es
23 push ds
24 ePUSHA
25
26 LOAD_BDA_SEGMENT_TO es, ax
27 call Initialize_ShouldSkip
28 jnz SHORT .SkipRomInitialization
29
30%ifdef USE_AT ; Early initialization on AT build
31 call Initialize_AndDetectDrives
32%else ; Late initialization on XT builds
33 call Int19hLate_InitializeInt19h
34%endif
35.SkipRomInitialization:
36 ePOPA
37 pop ds
38 pop es
39 popf
40 retf
41
42
43;--------------------------------------------------------------------
44; Checks if user wants to skip ROM initialization.
45;
46; Initialize_ShouldSkip
47; Parameters:
48; ES: BDA segment
49; Returns:
50; ZF: Cleared if ROM initialization is to be skipped
51; Set to continue ROM initialization
52; Corrupts registers:
53; Nothing
54;--------------------------------------------------------------------
55ALIGN JUMP_ALIGN
56Initialize_ShouldSkip:
57 sti ; Enable interrupts
58 test BYTE [es:BDA.bKBFlgs1], (1<<2) ; Clear ZF if CTRL is held down
59 ret
60
61
62;--------------------------------------------------------------------
63; Initializes the BIOS variables and detects IDE drives.
64;
65; Initialize_AndDetectDrives
66; Parameters:
67; ES: BDA Segment
68; Returns:
69; Nothing
70; Corrupts registers:
71; All, including segments
72;--------------------------------------------------------------------
73ALIGN JUMP_ALIGN
74Initialize_AndDetectDrives:
75 call DetectPrint_RomFoundAtSegment
76 call RamVars_Initialize
77 call RamVars_GetSegmentToDS
78 call Interrupts_InitializeInterruptVectors
79 call DetectDrives_FromAllIDEControllers
80 call CompatibleDPT_CreateForDrives80hAnd81h
81 ; Fall to .ResetDetectedDrives
82
83;--------------------------------------------------------------------
84; Resets all hard disks.
85;
86; Initialize_ResetDetectedDrives
87; Parameters:
88; DS: RAMVARS segment
89; Returns:
90; Nothing
91; Corrupts registers:
92; AX, BX, CX, DX, DI
93;--------------------------------------------------------------------
94;ALIGN JUMP_ALIGN
95.ResetDetectedDrives:
96 jmp AH0h_ResetHardDisksHandledByOurBIOS
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