| 1 | ; $Id: RTR0Os2DHQueryDOSVar.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - DevHelp_GetDOSVar, Ring-0 Driver, OS/2.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Contributed by knut st. osmundsen.
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| 8 | ;
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| 9 | ; Copyright (C) 2007-2020 Oracle Corporation
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| 10 | ;
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| 11 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | ; available from http://www.virtualbox.org. This file is free software;
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| 13 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 14 | ; General Public License (GPL) as published by the Free Software
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| 15 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | ;
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| 19 | ; The contents of this file may alternatively be used under the terms
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| 20 | ; of the Common Development and Distribution License Version 1.0
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| 21 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 22 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 23 | ; CDDL are applicable instead of those of the GPL.
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| 24 | ;
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| 25 | ; You may elect to license modified versions of this file under the
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| 26 | ; terms and conditions of either the GPL or the CDDL or both.
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| 27 | ; --------------------------------------------------------------------
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| 28 | ;
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| 29 | ; This code is based on:
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| 30 | ;
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| 31 | ; Copyright (c) 1999-2007 knut st. osmundsen <[email protected]>
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| 32 | ;
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| 33 | ; Permission is hereby granted, free of charge, to any person
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| 34 | ; obtaining a copy of this software and associated documentation
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| 35 | ; files (the "Software"), to deal in the Software without
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| 36 | ; restriction, including without limitation the rights to use,
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| 37 | ; copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 38 | ; copies of the Software, and to permit persons to whom the
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| 39 | ; Software is furnished to do so, subject to the following
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| 40 | ; conditions:
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| 41 | ;
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| 42 | ; The above copyright notice and this permission notice shall be
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| 43 | ; included in all copies or substantial portions of the Software.
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| 44 | ;
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| 45 | ; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 46 | ; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 47 | ; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 48 | ; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 49 | ; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 50 | ; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 51 | ; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 52 | ; OTHER DEALINGS IN THE SOFTWARE.
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| 53 | ;
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| 54 |
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| 55 |
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| 56 | ;*******************************************************************************
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| 57 | ;* Header Files *
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| 58 | ;*******************************************************************************
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| 59 | %define RT_INCL_16BIT_SEGMENTS
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| 60 | %include "iprt/asmdefs.mac"
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| 61 | %include "iprt/err.mac"
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| 62 |
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| 63 |
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| 64 | ;*******************************************************************************
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| 65 | ;* External Symbols *
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| 66 | ;*******************************************************************************
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| 67 | extern KernThunkStackTo32
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| 68 | extern KernThunkStackTo16
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| 69 | extern NAME(g_fpfnDevHlp)
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| 70 |
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| 71 |
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| 72 | ;*******************************************************************************
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| 73 | ;* Defined Constants And Macros *
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| 74 | ;*******************************************************************************
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| 75 | %define DevHlp_GetDOSVar 24h
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| 76 |
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| 77 |
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| 78 | BEGINCODE
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| 79 |
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| 80 | ;
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| 81 | ; Jump table used by RTR0Os2DHQueryDOSVar
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| 82 | ;
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| 83 | DosVarJumpTab:
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| 84 | dd 0 ; 0 - Reserved
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| 85 | dd Load1600 ; 1 - GIS
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| 86 | dd Load1616 ; 2 - LIS
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| 87 | dd 0 ; 3 - Reserved
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| 88 | dd Load1616 ; 4 - VectorSDF
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| 89 | dd Load1616 ; 5 - VectorReboot
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| 90 | dd Load1616 ; 6 - VectorMSATS
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| 91 | dd AsIs ; 7 - YieldFlag (Resched)
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| 92 | dd AsIs ; 8 - TCYieldFlag (TCResched)
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| 93 | dd AsIs ; 9 - DOSTable
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| 94 | dd Load1616 ; a - VectorDEKKO
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| 95 | dd AsIs ; b - CodePgBuff
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| 96 | dd Load1616 ; c - VectorRIPL
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| 97 | dd AsIs ; d - InterruptLevel
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| 98 | dd AsIs ; e - DevClassTables
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| 99 | dd AsIs ; f - DMQS_Sel
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| 100 | dd AsIs ;10 - APMInfo
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| 101 | dd LoadWord ;11 - APM_Length (length of above structure)
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| 102 | DosVarJumpTabEnd:
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| 103 | %define DosVarJumpTabSize (DosVarJumpTabEnd - DosVarJumpTab) / 4
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| 104 |
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| 105 | ;;
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| 106 | ; Unified DevHelp_GetDOSVar -> Far 16:16 pointer wrapper.
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| 107 | ;
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| 108 | ; @param iVar [ebp + 08h] Variable.
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| 109 | ; @param iMember [ebp + 0ch] Member.
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| 110 | ; @param pfp [ebp + 10h] Where to store the variable address (pointer to 16:16).
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| 111 | ;
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| 112 | BEGINPROC_EXPORTED RTR0Os2DHQueryDOSVar
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| 113 | ; switch stack first.
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| 114 | call KernThunkStackTo16
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| 115 |
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| 116 | ; normal prolog.
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| 117 | push ebp
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| 118 | mov ebp, esp
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| 119 | push dword [NAME(g_fpfnDevHlp)] ; ebp - 4
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| 120 | push ebx ; save ebx
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| 121 | push es ; save es
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| 122 |
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| 123 | ; setup the devhelp call and switch to
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| 124 | mov eax, [ebp + 08h] ; iVar (8-bit)
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| 125 | mov ecx, [ebp + 0ch] ; iMember (16-bit)
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| 126 | mov dl, DevHlp_GetDOSVar
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| 127 |
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| 128 | ; jump to the 16-bit code.
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| 129 | ;jmp far dword NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
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| 130 | db 066h
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| 131 | db 0eah
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| 132 | dw NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
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| 133 | dw CODE16
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| 134 | BEGINCODE16
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| 135 | GLOBALNAME RTR0Os2DHQueryDOSVar_16
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| 136 | call far [ss:ebp - 4]
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| 137 |
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| 138 | ;jmp far dword NAME(RTR0Os2DHQueryDOSVar) wrt FLAT
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| 139 | db 066h
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| 140 | db 0eah
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| 141 | dd NAME(RTR0Os2DHQueryDOSVar_32) ;wrt FLAT
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| 142 | dw TEXT32 wrt FLAT
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| 143 | BEGINCODE
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| 144 | GLOBALNAME RTR0Os2DHQueryDOSVar_32
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| 145 | jc Error1
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| 146 |
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| 147 | ;
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| 148 | ; Make ax:ebx contain the pointer and take action according
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| 149 | ; to the variable jump table.
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| 150 | ;
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| 151 | and ebx, 0000ffffh ; clean high part of ebx
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| 152 | movzx ecx, byte [ebp + 08] ; iVar
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| 153 | cmp ecx, DosVarJumpTabSize
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| 154 | jg Error2
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| 155 | jmp [DosVarJumpTab + ecx * 4]
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| 156 |
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| 157 | ; Load Word at ax:ebx.
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| 158 | LoadWord:
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| 159 | mov es, ax
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| 160 | movzx edx, word [es:ebx]
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| 161 | jmp StoreIt
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| 162 |
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| 163 | ; Load selector at ax:ebx.
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| 164 | Load1600:
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| 165 | mov es, ax
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| 166 | movzx edx, word [es:ebx]
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| 167 | shl edx, 16
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| 168 | jmp StoreIt
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| 169 |
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| 170 | ; Load 16:16 ptr at ax:ebx.
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| 171 | Load1616:
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| 172 | mov es, ax
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| 173 | mov edx, dword [es:ebx]
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| 174 | jmp StoreIt
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| 175 |
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| 176 | ; Move ax:bx into edx.
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| 177 | AsIs:
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| 178 | mov dx, ax
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| 179 | shl edx, 16
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| 180 | mov dx, bx
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| 181 | jmp StoreIt
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| 182 |
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| 183 | Error2:
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| 184 | mov eax, VERR_INVALID_PARAMETER
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| 185 | jmp Done
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| 186 |
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| 187 | Error1:
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| 188 | mov eax, VERR_GENERAL_FAILURE
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| 189 | jmp Done
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| 190 |
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| 191 | StoreIt:
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| 192 | mov ecx, [ebp + 10h]
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| 193 | mov [ecx], edx
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| 194 | xor eax, eax ; return success (VINF_SUCCESS == 0)
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| 195 |
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| 196 | Done:
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| 197 | pop es
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| 198 | pop ebx
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| 199 | leave
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| 200 |
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| 201 | ; switch stack back and return.
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| 202 | push eax
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| 203 | call KernThunkStackTo32
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| 204 | pop eax
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| 205 | ret
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| 206 | ENDPROC RTR0Os2DHQueryDOSVar
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| 207 |
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