source: xtideuniversalbios/trunk/Assembly_Library/Src/File/DosCritical.asm@ 237

Last change on this file since 237 was 41, checked in by Tomi Tilli, 14 years ago

Initial commit for Assembly Library.

File size: 1.9 KB
Line 
1; File name : DosCritical.asm
2; Project name : Assembly Library
3; Created date : 1.9.2010
4; Last update : 2.9.2010
5; Author : Tomi Tilli
6; Description : DOS Critical Error Handler (24h) replacements.
7
8; DOS Critical Error Handler return values
9struc CRITICAL_ERROR_ACTION
10 .ignoreErrorAndContinueProcessingRequest resb 1
11 .retryOperation resb 1
12 .terminateProgramAsThoughInt21hAH4ChCalled resb 1
13 .failSystemCallInProgress resb 1
14endstruc
15
16
17; Section containing code
18SECTION .text
19
20;--------------------------------------------------------------------
21; DosCritical_InstallNewHandlerFromCSDX
22; Parameters:
23; CS:DX: New Critical Error Handler
24; Returns:
25; Nothing
26; Corrupts registers:
27; AX
28;--------------------------------------------------------------------
29ALIGN JUMP_ALIGN
30DosCritical_InstallNewHandlerFromCSDX:
31 push ds
32
33 push cs
34 pop ds
35 mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
36 int DOS_INTERRUPT_21h
37
38 pop ds
39 ret
40
41
42;--------------------------------------------------------------------
43; DosCritical_RestoreDosHandler
44; Parameters:
45; Nothing
46; Returns:
47; Nothing
48; Corrupts registers:
49; Nothing
50;--------------------------------------------------------------------
51ALIGN JUMP_ALIGN
52DosCritical_RestoreDosHandler:
53 push ds
54 push dx
55 push ax
56
57 lds dx, [cs:PSP.fpInt24hCriticalError]
58 mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
59 int DOS_INTERRUPT_21h
60
61 pop ax
62 pop dx
63 pop ds
64 ret
65
66
67;--------------------------------------------------------------------
68; DosCritical_HandlerToIgnoreAllErrors
69; Parameters:
70; Nothing
71; Returns:
72; AL: CRITICAL_ERROR_ACTION
73; Corrupts registers:
74; Nothing
75;--------------------------------------------------------------------
76ALIGN JUMP_ALIGN
77DosCritical_HandlerToIgnoreAllErrors:
78 mov al, CRITICAL_ERROR_ACTION.ignoreErrorAndContinueProcessingRequest
79 iret
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