| [41] | 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 |
|
|---|
| [376] | 8 | ;
|
|---|
| [526] | 9 | ; XTIDE Universal BIOS and Associated Tools
|
|---|
| 10 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
|
|---|
| [376] | 11 | ;
|
|---|
| 12 | ; This program is free software; you can redistribute it and/or modify
|
|---|
| 13 | ; it under the terms of the GNU General Public License as published by
|
|---|
| 14 | ; the Free Software Foundation; either version 2 of the License, or
|
|---|
| 15 | ; (at your option) any later version.
|
|---|
| [526] | 16 | ;
|
|---|
| [376] | 17 | ; This program is distributed in the hope that it will be useful,
|
|---|
| 18 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| [526] | 20 | ; GNU General Public License for more details.
|
|---|
| [376] | 21 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|---|
| 22 | ;
|
|---|
| 23 |
|
|---|
| [526] | 24 |
|
|---|
| [41] | 25 | ; DOS Critical Error Handler return values
|
|---|
| 26 | struc CRITICAL_ERROR_ACTION
|
|---|
| 27 | .ignoreErrorAndContinueProcessingRequest resb 1
|
|---|
| 28 | .retryOperation resb 1
|
|---|
| 29 | .terminateProgramAsThoughInt21hAH4ChCalled resb 1
|
|---|
| 30 | .failSystemCallInProgress resb 1
|
|---|
| 31 | endstruc
|
|---|
| 32 |
|
|---|
| 33 |
|
|---|
| 34 | ; Section containing code
|
|---|
| 35 | SECTION .text
|
|---|
| 36 |
|
|---|
| 37 | ;--------------------------------------------------------------------
|
|---|
| 38 | ; DosCritical_InstallNewHandlerFromCSDX
|
|---|
| 39 | ; Parameters:
|
|---|
| 40 | ; CS:DX: New Critical Error Handler
|
|---|
| 41 | ; Returns:
|
|---|
| 42 | ; Nothing
|
|---|
| 43 | ; Corrupts registers:
|
|---|
| 44 | ; AX
|
|---|
| 45 | ;--------------------------------------------------------------------
|
|---|
| 46 | ALIGN JUMP_ALIGN
|
|---|
| 47 | DosCritical_InstallNewHandlerFromCSDX:
|
|---|
| 48 | push ds
|
|---|
| 49 |
|
|---|
| 50 | push cs
|
|---|
| 51 | pop ds
|
|---|
| 52 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
|
|---|
| 53 | int DOS_INTERRUPT_21h
|
|---|
| 54 |
|
|---|
| 55 | pop ds
|
|---|
| 56 | ret
|
|---|
| 57 |
|
|---|
| 58 |
|
|---|
| 59 | ;--------------------------------------------------------------------
|
|---|
| 60 | ; DosCritical_RestoreDosHandler
|
|---|
| 61 | ; Parameters:
|
|---|
| 62 | ; Nothing
|
|---|
| 63 | ; Returns:
|
|---|
| 64 | ; Nothing
|
|---|
| 65 | ; Corrupts registers:
|
|---|
| 66 | ; Nothing
|
|---|
| 67 | ;--------------------------------------------------------------------
|
|---|
| 68 | ALIGN JUMP_ALIGN
|
|---|
| 69 | DosCritical_RestoreDosHandler:
|
|---|
| 70 | push ds
|
|---|
| 71 | push dx
|
|---|
| 72 | push ax
|
|---|
| 73 |
|
|---|
| 74 | lds dx, [cs:PSP.fpInt24hCriticalError]
|
|---|
| 75 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
|
|---|
| 76 | int DOS_INTERRUPT_21h
|
|---|
| 77 |
|
|---|
| 78 | pop ax
|
|---|
| 79 | pop dx
|
|---|
| 80 | pop ds
|
|---|
| 81 | ret
|
|---|
| 82 |
|
|---|
| 83 |
|
|---|
| 84 | ;--------------------------------------------------------------------
|
|---|
| 85 | ; DosCritical_HandlerToIgnoreAllErrors
|
|---|
| 86 | ; Parameters:
|
|---|
| 87 | ; Nothing
|
|---|
| 88 | ; Returns:
|
|---|
| 89 | ; AL: CRITICAL_ERROR_ACTION
|
|---|
| 90 | ; Corrupts registers:
|
|---|
| 91 | ; Nothing
|
|---|
| [526] | 92 | ;--------------------------------------------------------------------
|
|---|
| [41] | 93 | ALIGN JUMP_ALIGN
|
|---|
| 94 | DosCritical_HandlerToIgnoreAllErrors:
|
|---|
| 95 | mov al, CRITICAL_ERROR_ACTION.ignoreErrorAndContinueProcessingRequest
|
|---|
| 96 | iret
|
|---|
