[41] | 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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[376] | 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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[41] | 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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