| 1 | ; File name : DosCritical.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 1.9.2010
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| 4 | ; Last update : 2.9.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : DOS Critical Error Handler (24h) replacements.
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| 7 |
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| 8 | ;
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| 9 | ; XTIDE Universal BIOS and Associated Tools
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| 10 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or modify
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| 13 | ; it under the terms of the GNU General Public License as published by
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| 14 | ; the Free Software Foundation; either version 2 of the License, or
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| 15 | ; (at your option) any later version.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful,
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| 18 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | ; GNU General Public License for more details.
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| 21 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 22 | ;
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| 23 |
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| 24 |
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| 25 | ; DOS Critical Error Handler return values
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| 26 | struc CRITICAL_ERROR_ACTION
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| 27 | .ignoreErrorAndContinueProcessingRequest resb 1
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| 28 | .retryOperation resb 1
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| 29 | .terminateProgramAsThoughInt21hAH4ChCalled resb 1
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| 30 | .failSystemCallInProgress resb 1
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| 31 | endstruc
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| 32 |
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| 33 |
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| 34 | ; Section containing code
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| 35 | SECTION .text
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| 36 |
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| 37 | ;--------------------------------------------------------------------
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| 38 | ; DosCritical_InstallNewHandlerFromCSDX
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| 39 | ; Parameters:
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| 40 | ; CS:DX: New Critical Error Handler
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| 41 | ; Returns:
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| 42 | ; Nothing
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| 43 | ; Corrupts registers:
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| 44 | ; AX
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| 45 | ;--------------------------------------------------------------------
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| 46 | ALIGN JUMP_ALIGN
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| 47 | DosCritical_InstallNewHandlerFromCSDX:
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| 48 | push ds
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| 49 |
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| 50 | push cs
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| 51 | pop ds
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| 52 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
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| 53 | int DOS_INTERRUPT_21h
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| 54 |
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| 55 | pop ds
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| 56 | ret
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| 57 |
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| 58 |
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| 59 | ;--------------------------------------------------------------------
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| 60 | ; DosCritical_RestoreDosHandler
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| 61 | ; Parameters:
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| 62 | ; Nothing
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| 63 | ; Returns:
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| 64 | ; Nothing
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| 65 | ; Corrupts registers:
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| 66 | ; Nothing
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| 67 | ;--------------------------------------------------------------------
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| 68 | ALIGN JUMP_ALIGN
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| 69 | DosCritical_RestoreDosHandler:
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| 70 | push ds
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| 71 | push dx
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| 72 | push ax
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| 73 |
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| 74 | lds dx, [cs:PSP.fpInt24hCriticalError]
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| 75 | mov ax, (SET_INTERRUPT_VECTOR<<8) | DOS_CRITICAL_ERROR_HANDLER_24h
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| 76 | int DOS_INTERRUPT_21h
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| 77 |
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| 78 | pop ax
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| 79 | pop dx
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| 80 | pop ds
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| 81 | ret
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| 82 |
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| 83 |
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| 84 | ;--------------------------------------------------------------------
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| 85 | ; DosCritical_HandlerToIgnoreAllErrors
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| 86 | ; Parameters:
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| 87 | ; Nothing
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| 88 | ; Returns:
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| 89 | ; AL: CRITICAL_ERROR_ACTION
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| 90 | ; Corrupts registers:
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| 91 | ; Nothing
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| 92 | ;--------------------------------------------------------------------
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| 93 | ALIGN JUMP_ALIGN
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| 94 | DosCritical_HandlerToIgnoreAllErrors:
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| 95 | mov al, CRITICAL_ERROR_ACTION.ignoreErrorAndContinueProcessingRequest
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| 96 | iret
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