| 1 | ; $Id: SUPDrvA-os2.asm 10729 2008-07-17 15:05:47Z vboxsync $
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| 2 | ;; @file
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| 3 | ; VBoxDrv - OS/2 assembly file, the first file in the link.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (c) 2007 knut st. osmundsen <[email protected]>
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| 8 | ;
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| 9 | ; Permission is hereby granted, free of charge, to any person
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| 10 | ; obtaining a copy of this software and associated documentation
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| 11 | ; files (the "Software"), to deal in the Software without
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| 12 | ; restriction, including without limitation the rights to use,
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| 13 | ; copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | ; copies of the Software, and to permit persons to whom the
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| 15 | ; Software is furnished to do so, subject to the following
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| 16 | ; conditions:
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| 17 | ;
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| 18 | ; The above copyright notice and this permission notice shall be
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| 19 | ; included in all copies or substantial portions of the Software.
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| 20 | ;
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| 21 | ; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | ; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | ; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | ; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | ; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | ; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | ; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | ; OTHER DEALINGS IN THE SOFTWARE.
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| 29 | ;
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| 30 |
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| 31 |
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| 32 | ;*******************************************************************************
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| 33 | ;* Header Files *
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| 34 | ;*******************************************************************************
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| 35 | %define RT_INCL_16BIT_SEGMENTS
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| 36 | %include "iprt/asmdefs.mac"
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| 37 |
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| 38 |
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| 39 | ;*******************************************************************************
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| 40 | ;* Structures and Typedefs *
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| 41 | ;*******************************************************************************
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| 42 | ;;
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| 43 | ; Request packet header.
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| 44 | struc PKTHDR
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| 45 | .cb resb 1
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| 46 | .unit resb 1
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| 47 | .cmd resb 1
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| 48 | .status resw 1
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| 49 | .res1 resd 1
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| 50 | .link resd 1
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| 51 | endstruc
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| 52 |
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| 53 |
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| 54 | ;;
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| 55 | ; Init request packet - input.
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| 56 | struc PKTINITIN
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| 57 | .cb resb 1
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| 58 | .unit resb 1
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| 59 | .cmd resb 1
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| 60 | .status resw 1
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| 61 | .res1 resd 1
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| 62 | .link resd 1
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| 63 |
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| 64 | .data_1 resb 1
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| 65 | .fpfnDevHlp resd 1
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| 66 | .fpszArgs resd 1
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| 67 | .data_2 resb 1
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| 68 | endstruc
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| 69 |
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| 70 | ;;
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| 71 | ; Init request packet - output.
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| 72 | struc PKTINITOUT
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| 73 | .cb resb 1
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| 74 | .unit resb 1
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| 75 | .cmd resb 1
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| 76 | .status resw 1
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| 77 | .res1 resd 1
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| 78 | .link resd 1
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| 79 |
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| 80 | .cUnits resb 1 ; block devs only.
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| 81 | .cbCode16 resw 1
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| 82 | .cbData16 resw 1
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| 83 | .fpaBPBs resd 1 ; block devs only.
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| 84 | .data_2 resb 1
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| 85 | endstruc
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| 86 |
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| 87 | ;;
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| 88 | ; Open request packet.
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| 89 | struc PKTOPEN
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| 90 | .cb resb 1
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| 91 | .unit resb 1
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| 92 | .cmd resb 1
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| 93 | .status resw 1
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| 94 | .res1 resd 1
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| 95 | .link resd 1
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| 96 | .sfn resw 1
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| 97 | endstruc
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| 98 |
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| 99 | ;;
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| 100 | ; Close request packet.
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| 101 | struc PKTCLOSE
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| 102 | .cb resb 1
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| 103 | .unit resb 1
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| 104 | .cmd resb 1
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| 105 | .status resw 1
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| 106 | .res1 resd 1
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| 107 | .link resd 1
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| 108 | .sfn resw 1
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| 109 | endstruc
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| 110 |
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| 111 | ;;
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| 112 | ; IOCtl request packet.
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| 113 | struc PKTIOCTL
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| 114 | .cb resb 1
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| 115 | .unit resb 1
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| 116 | .cmd resb 1
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| 117 | .status resw 1
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| 118 | .res1 resd 1
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| 119 | .link resd 1
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| 120 |
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| 121 | .cat resb 1
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| 122 | .fun resb 1
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| 123 | .pParm resd 1
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| 124 | .pData resd 1
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| 125 | .sfn resw 1
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| 126 | .cbParm resw 1
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| 127 | .cbData resw 1
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| 128 | endstruc
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| 129 |
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| 130 | ;;
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| 131 | ; Read/Write request packet
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| 132 | struc PKTRW
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| 133 | .cb resb 1
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| 134 | .unit resb 1
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| 135 | .cmd resb 1
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| 136 | .status resw 1
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| 137 | .res1 resd 1
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| 138 | .link resd 1
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| 139 |
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| 140 | .media resb 1
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| 141 | .PhysTrans resd 1
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| 142 | .cbTrans resw 1
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| 143 | .start resd 1
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| 144 | .sfn resw 1
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| 145 | endstruc
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| 146 |
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| 147 |
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| 148 |
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| 149 | ;;
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| 150 | ; The two device headers.
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| 151 | segment DATA16
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| 152 |
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| 153 | ; Some devhdr.inc stuff.
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| 154 | %define DEVLEV_3 0180h
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| 155 | %define DEV_30 0800h
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| 156 | %define DEV_CHAR_DEV 8000h
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| 157 | %define DEV_16MB 0002h
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| 158 | %define DEV_IOCTL2 0001h
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| 159 |
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| 160 | ; Some dhcalls.h stuff.
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| 161 | %define DevHlp_VirtToLin 05bh
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| 162 | %define DevHlp_SAVE_MESSAGE 03dh
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| 163 | %define DevHlp_PhysToVirt 015h
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| 164 |
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| 165 | ; Fast IOCtl category, also defined in SUPDrvIOC.h
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| 166 | %define SUP_CTL_CATEGORY_FAST 0c1h
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| 167 |
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| 168 |
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| 169 | ;*******************************************************************************
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| 170 | ;* External Symbols *
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| 171 | ;*******************************************************************************
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| 172 | extern KernThunkStackTo32
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| 173 | extern KernThunkStackTo16
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| 174 | extern DOS16OPEN
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| 175 | extern DOS16CLOSE
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| 176 | extern DOS16WRITE
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| 177 | extern NAME(VBoxDrvInit)
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| 178 | extern NAME(VBoxDrvOpen)
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| 179 | extern NAME(VBoxDrvClose)
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| 180 | extern NAME(VBoxDrvIOCtl)
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| 181 | extern NAME(VBoxDrvIOCtlFast)
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| 182 |
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| 183 |
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| 184 | ;;
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| 185 | ; Device headers. The first one is the one we'll be opening and the
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| 186 | ; latter is only used for 32-bit initialization.
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| 187 | GLOBALNAME g_VBoxDrvHdr1
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| 188 | dw NAME(g_VBoxDrvHdr2) wrt DATA16 ; NextHeader.off
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| 189 | dw DATA16 ; NextHeader.sel
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| 190 | dw DEVLEV_3 | DEV_30 | DEV_CHAR_DEV; SDevAtt
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| 191 | dw NAME(VBoxDrvEP) wrt CODE16 ; StrategyEP
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| 192 | dw 0 ; InterruptEP
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| 193 | db 'vboxdrv$' ; DevName
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| 194 | dw 0 ; SDevProtCS
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| 195 | dw 0 ; SDevProtDS
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| 196 | dw 0 ; SDevRealCS
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| 197 | dw 0 ; SDevRealDS
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| 198 | dd DEV_16MB | DEV_IOCTL2 ; SDevCaps
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| 199 |
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| 200 | align 4
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| 201 | GLOBALNAME g_VBoxDrvHdr2
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| 202 | dd 0ffffffffh ; NextHeader (NIL)
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| 203 | dw DEVLEV_3 | DEV_30 | DEV_CHAR_DEV; SDevAtt
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| 204 | dw NAME(VBoxDrvInitEP) wrt CODE16 ; StrategyEP
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| 205 | dw 0 ; InterruptEP
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| 206 | db 'vboxdr1$' ; DevName
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| 207 | dw 0 ; SDevProtCS
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| 208 | dw 0 ; SDevProtDS
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| 209 | dw 0 ; SDevRealCS
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| 210 | dw 0 ; SDevRealDS
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| 211 | dd DEV_16MB | DEV_IOCTL2 ; SDevCaps
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| 212 |
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| 213 |
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| 214 | ;; Tristate 32-bit initialization indicator [0 = need init, -1 = init failed, 1 init succeeded].
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| 215 | ; Check in the open path of the primary driver. The secondary driver will
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| 216 | ; open the primary one during it's init and thereby trigger the 32-bit init.
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| 217 | GLOBALNAME g_fInitialized
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| 218 | db 0
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| 219 |
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| 220 | align 4
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| 221 | ;; Pointer to the device helper service routine
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| 222 | ; This is set during the initialization of the 2nd device driver.
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| 223 | GLOBALNAME g_fpfnDevHlp
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| 224 | dd 0
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| 225 |
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| 226 |
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| 227 | ;; Where we write to the log.
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| 228 | GLOBALNAME g_offLogHead
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| 229 | dw 0
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| 230 | ;; Where we read from the log.
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| 231 | GLOBALNAME g_offLogTail
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| 232 | dw 0
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| 233 | ;; The size of the log. (power of two!)
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| 234 | %define LOG_SIZE 16384
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| 235 | GLOBALNAME g_cchLogMax
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| 236 | dw LOG_SIZE
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| 237 | ;; The log buffer.
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| 238 | GLOBALNAME g_szLog
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| 239 | times LOG_SIZE db 0
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| 240 |
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| 241 |
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| 242 | ;
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| 243 | ; The init data.
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| 244 | ;
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| 245 | segment DATA16_INIT
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| 246 | GLOBALNAME g_InitDataStart
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| 247 |
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| 248 | ;; Far pointer to the device argument.
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| 249 | g_fpszArgs:
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| 250 | dd 0
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| 251 |
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| 252 | %if 0
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| 253 | ;; Message table for the Save_Message device helper.
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| 254 | GLOBALNAME g_MsgTab
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| 255 | dw 1178 ; MsgId - 'MSG_REPLACEMENT_STRING'.
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| 256 | dw 1 ; cMsgStrings
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| 257 | dw NAME(g_szInitText) ; MsgStrings[0]
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| 258 | dw seg NAME(g_szInitText)
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| 259 | %else
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| 260 | ;; Far pointer to DOS16WRITE (corrected set before called).
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| 261 | ; Just a temporary hack to work around a wlink issue.
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| 262 | GLOBALNAME g_fpfnDos16Write
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| 263 | dw DOS16WRITE
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| 264 | dw seg DOS16WRITE
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| 265 | %endif
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| 266 |
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| 267 | ;; Size of the text currently in the g_szInitText buffer.
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| 268 | GLOBALNAME g_cchInitText
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| 269 | dw 0
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| 270 | ;; The max size of text that can fit into the g_szInitText buffer.
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| 271 | GLOBALNAME g_cchInitTextMax
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| 272 | dw 512
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| 273 | ;; The init text buffer.
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| 274 | GLOBALNAME g_szInitText
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| 275 | times 512 db 0
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| 276 |
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| 277 | ;
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| 278 | ; The 16-bit code segment.
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| 279 | ;
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| 280 | segment CODE16
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| 281 |
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| 282 |
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| 283 | ;;
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| 284 | ; The strategy entry point (vboxdrv$).
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| 285 | ;
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| 286 | ; ss:bx -> request packet
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| 287 | ; ds:si -> device header
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| 288 | ;
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| 289 | ; Can clobber any registers it likes except SP.
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| 290 | ;
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| 291 | BEGINPROC VBoxDrvEP
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| 292 | push ebp
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| 293 | mov ebp, esp
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| 294 | push es ; bp - 2
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| 295 | push bx ; bp - 4
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| 296 | and sp, 0fffch
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| 297 |
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| 298 | ;
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| 299 | ; Check for the most frequent first.
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| 300 | ;
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| 301 | cmp byte [es:bx + PKTHDR.cmd], 10h ; Generic IOCtl
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| 302 | jne near VBoxDrvEP_NotGenIOCtl
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| 303 |
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| 304 |
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| 305 | ;
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| 306 | ; Generic I/O Control Request.
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| 307 | ;
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| 308 | VBoxDrvEP_GenIOCtl:
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| 309 |
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| 310 | ; Fast IOCtl?
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| 311 | cmp byte [es:bx + PKTIOCTL.cat], SUP_CTL_CATEGORY_FAST
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| 312 | jne VBoxDrvEP_GenIOCtl_Other
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| 313 |
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| 314 | ;
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| 315 | ; Fast IOCtl.
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| 316 | ; DECLASM(int) VBoxDrvIOCtlFast(uint16_t sfn, uint8_t iFunction)
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| 317 | ;
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| 318 | VBoxDrvEP_GenIOCtl_Fast:
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| 319 | ; function.
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| 320 | movzx edx, byte [es:bx + PKTIOCTL.fun]
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| 321 | push edx ; 04h
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| 322 |
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| 323 | ; system file number.
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| 324 | movzx eax, word [es:bx + PKTIOCTL.sfn]
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| 325 | push eax ; 00h
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| 326 |
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| 327 | ; go to the 32-bit code
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| 328 | ;jmp far dword NAME(VBoxDrvEP_GenIOCtl_Fast_32) wrt FLAT
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| 329 | db 066h
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| 330 | db 0eah
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| 331 | dd NAME(VBoxDrvEP_GenIOCtl_Fast_32) ;wrt FLAT
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| 332 | dw TEXT32 wrt FLAT
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| 333 | segment TEXT32
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| 334 | GLOBALNAME VBoxDrvEP_GenIOCtl_Fast_32
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| 335 |
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| 336 | ; switch stack to 32-bit.
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| 337 | mov ax, DATA32 wrt FLAT
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| 338 | mov ds, ax
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| 339 | mov es, ax
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| 340 | call KernThunkStackTo32
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| 341 |
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| 342 | ; call the C code (don't cleanup the stack).
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| 343 | call NAME(VBoxDrvIOCtlFast)
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| 344 |
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| 345 | ; switch back the stack.
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| 346 | push eax
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| 347 | call KernThunkStackTo16
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| 348 | pop eax
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| 349 |
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| 350 | ; jump back to the 16-bit code.
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| 351 | ;jmp far dword NAME(VBoxDrvEP_GenIOCtl_Fast_16) wrt CODE16
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| 352 | db 066h
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| 353 | db 0eah
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| 354 | dw NAME(VBoxDrvEP_GenIOCtl_Fast_16) wrt CODE16
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| 355 | dw CODE16
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| 356 | segment CODE16
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| 357 | GLOBALNAME VBoxDrvEP_GenIOCtl_Fast_16
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| 358 | les bx, [bp - 4] ; Reload the packet pointer.
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| 359 | or eax, eax
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| 360 | jnz near VBoxDrvEP_GeneralFailure
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| 361 |
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| 362 | ; setup output stuff.
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| 363 | xor eax, eax
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| 364 | mov [es:bx + PKTIOCTL.cbParm], eax ; update cbParm and cbData.
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| 365 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
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| 366 |
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| 367 | mov sp, bp
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| 368 | pop ebp
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| 369 | retf
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| 370 |
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| 371 | ;
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| 372 | ; Other IOCtl (slow)
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| 373 | ;
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| 374 | VBoxDrvEP_GenIOCtl_Other:
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| 375 | mov eax, [es:bx + PKTIOCTL.cbParm] ; Load cbParm and cbData
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| 376 | push eax ; 1eh - in/out data size.
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| 377 | ; 1ch - in/out parameter size.
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| 378 | push edx ; 18h - pointer to data size (filled in later).
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| 379 | push ecx ; 14h - pointer to param size (filled in later).
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| 380 |
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| 381 | ; pData (convert to flat 32-bit)
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| 382 | mov ax, word [es:bx + PKTIOCTL.pData + 2] ; selector
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| 383 | cmp ax, 3 ; <= 3 -> nil selector...
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| 384 | jbe .no_data
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| 385 | movzx esi, word [es:bx + PKTIOCTL.pData] ; offset
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| 386 | mov dl, DevHlp_VirtToLin
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| 387 | call far [NAME(g_fpfnDevHlp)]
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| 388 | jc near VBoxDrvEP_GeneralFailure
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| 389 | jmp .finish_data
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| 390 | .no_data:
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| 391 | xor eax, eax
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| 392 | .finish_data:
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| 393 | push eax ; 10h
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| 394 |
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| 395 | ; pParm (convert to flat 32-bit)
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| 396 | mov ax, word [es:bx + PKTIOCTL.pParm + 2] ; selector
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| 397 | cmp ax, 3 ; <= 3 -> nil selector...
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| 398 | jbe .no_parm
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| 399 | movzx esi, word [es:bx + PKTIOCTL.pParm] ; offset
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| 400 | mov dl, DevHlp_VirtToLin
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| 401 | call far [NAME(g_fpfnDevHlp)]
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| 402 | jc near VBoxDrvEP_GeneralFailure
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| 403 | jmp .finish_parm
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| 404 | .no_parm:
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| 405 | xor eax, eax
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| 406 | .finish_parm:
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| 407 | push eax ; 0ch
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| 408 |
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| 409 | ; function.
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| 410 | movzx edx, byte [es:bx + PKTIOCTL.fun]
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| 411 | push edx ; 08h
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| 412 |
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| 413 | ; category.
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| 414 | movzx ecx, byte [es:bx + PKTIOCTL.cat]
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| 415 | push ecx ; 04h
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| 416 |
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| 417 | ; system file number.
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| 418 | movzx eax, word [es:bx + PKTIOCTL.sfn]
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| 419 | push eax ; 00h
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| 420 |
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| 421 | ; go to the 32-bit code
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| 422 | ;jmp far dword NAME(VBoxDrvEP_GenIOCtl_Other_32) wrt FLAT
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| 423 | db 066h
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| 424 | db 0eah
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| 425 | dd NAME(VBoxDrvEP_GenIOCtl_Other_32) ;wrt FLAT
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| 426 | dw TEXT32 wrt FLAT
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| 427 | segment TEXT32
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| 428 | GLOBALNAME VBoxDrvEP_GenIOCtl_Other_32
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| 429 |
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| 430 | ; switch stack to 32-bit.
|
|---|
| 431 | mov ax, DATA32 wrt FLAT
|
|---|
| 432 | mov ds, ax
|
|---|
| 433 | mov es, ax
|
|---|
| 434 | call KernThunkStackTo32
|
|---|
| 435 |
|
|---|
| 436 | ; update in/out parameter pointers
|
|---|
| 437 | lea eax, [esp + 1ch]
|
|---|
| 438 | mov [esp + 14h], eax
|
|---|
| 439 | lea edx, [esp + 1eh]
|
|---|
| 440 | mov [esp + 18h], edx
|
|---|
| 441 |
|
|---|
| 442 | ; call the C code (don't cleanup the stack).
|
|---|
| 443 | call NAME(VBoxDrvIOCtl)
|
|---|
| 444 |
|
|---|
| 445 | ; switch back the stack.
|
|---|
| 446 | push eax
|
|---|
| 447 | call KernThunkStackTo16
|
|---|
| 448 | pop eax
|
|---|
| 449 |
|
|---|
| 450 | ; jump back to the 16-bit code.
|
|---|
| 451 | ;jmp far dword NAME(VBoxDrvEP_GenIOCtl_Other_16) wrt CODE16
|
|---|
| 452 | db 066h
|
|---|
| 453 | db 0eah
|
|---|
| 454 | dw NAME(VBoxDrvEP_GenIOCtl_Other_16) wrt CODE16
|
|---|
| 455 | dw CODE16
|
|---|
| 456 | segment CODE16
|
|---|
| 457 | GLOBALNAME VBoxDrvEP_GenIOCtl_Other_16
|
|---|
| 458 | les bx, [bp - 4] ; Reload the packet pointer.
|
|---|
| 459 | or eax, eax
|
|---|
| 460 | jnz near VBoxDrvEP_GeneralFailure
|
|---|
| 461 |
|
|---|
| 462 | ; setup output stuff.
|
|---|
| 463 | mov edx, esp
|
|---|
| 464 | mov eax, [ss:edx + 1ch] ; output sizes.
|
|---|
| 465 | mov [es:bx + PKTIOCTL.cbParm], eax ; update cbParm and cbData.
|
|---|
| 466 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 467 |
|
|---|
| 468 | mov sp, bp
|
|---|
| 469 | pop ebp
|
|---|
| 470 | retf
|
|---|
| 471 |
|
|---|
| 472 |
|
|---|
| 473 | ;
|
|---|
| 474 | ; Less Performance Critical Requests.
|
|---|
| 475 | ;
|
|---|
| 476 | VBoxDrvEP_NotGenIOCtl:
|
|---|
| 477 | cmp byte [es:bx + PKTHDR.cmd], 0dh ; Open
|
|---|
| 478 | je VBoxDrvEP_Open
|
|---|
| 479 | cmp byte [es:bx + PKTHDR.cmd], 0eh ; Close
|
|---|
| 480 | je VBoxDrvEP_Close
|
|---|
| 481 | cmp byte [es:bx + PKTHDR.cmd], 00h ; Init
|
|---|
| 482 | je VBoxDrvEP_Init
|
|---|
| 483 | cmp byte [es:bx + PKTHDR.cmd], 04h ; Read
|
|---|
| 484 | je near VBoxDrvEP_Read
|
|---|
| 485 | jmp near VBoxDrvEP_NotSupported
|
|---|
| 486 |
|
|---|
| 487 |
|
|---|
| 488 | ;
|
|---|
| 489 | ; Open Request. w/ ring-0 init.
|
|---|
| 490 | ;
|
|---|
| 491 | VBoxDrvEP_Open:
|
|---|
| 492 | cmp byte [NAME(g_fInitialized)], 1
|
|---|
| 493 | jne VBoxDrvEP_OpenOther
|
|---|
| 494 |
|
|---|
| 495 | ; First argument, the system file number.
|
|---|
| 496 | movzx eax, word [es:bx + PKTOPEN.sfn]
|
|---|
| 497 | push eax
|
|---|
| 498 |
|
|---|
| 499 | ; go to the 32-bit code
|
|---|
| 500 | ;jmp far dword NAME(VBoxDrvEP_Open_32) wrt FLAT
|
|---|
| 501 | db 066h
|
|---|
| 502 | db 0eah
|
|---|
| 503 | dd NAME(VBoxDrvEP_Open_32) ;wrt FLAT
|
|---|
| 504 | dw TEXT32 wrt FLAT
|
|---|
| 505 | segment TEXT32
|
|---|
| 506 | GLOBALNAME VBoxDrvEP_Open_32
|
|---|
| 507 |
|
|---|
| 508 | ; switch stack to 32-bit.
|
|---|
| 509 | mov ax, DATA32 wrt FLAT
|
|---|
| 510 | mov ds, ax
|
|---|
| 511 | mov es, ax
|
|---|
| 512 | call KernThunkStackTo32
|
|---|
| 513 |
|
|---|
| 514 | ; call the C code.
|
|---|
| 515 | call NAME(VBoxDrvOpen)
|
|---|
| 516 |
|
|---|
| 517 | ; switch back the stack.
|
|---|
| 518 | push eax
|
|---|
| 519 | call KernThunkStackTo16
|
|---|
| 520 | pop eax
|
|---|
| 521 |
|
|---|
| 522 | ; jump back to the 16-bit code.
|
|---|
| 523 | ;jmp far dword NAME(VBoxDrvEP_Open_32) wrt CODE16
|
|---|
| 524 | db 066h
|
|---|
| 525 | db 0eah
|
|---|
| 526 | dw NAME(VBoxDrvEP_Open_16) wrt CODE16
|
|---|
| 527 | dw CODE16
|
|---|
| 528 | segment CODE16
|
|---|
| 529 | GLOBALNAME VBoxDrvEP_Open_16
|
|---|
| 530 | les bx, [bp - 4] ; Reload the packet pointer.
|
|---|
| 531 | or eax, eax
|
|---|
| 532 | jnz near VBoxDrvEP_GeneralFailure
|
|---|
| 533 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 534 | jmp near VBoxDrvEP_Done
|
|---|
| 535 |
|
|---|
| 536 | ; Initializing or failed init?
|
|---|
| 537 | VBoxDrvEP_OpenOther:
|
|---|
| 538 | cmp byte [NAME(g_fInitialized)], 0
|
|---|
| 539 | jne VBoxDrvEP_OpenFailed
|
|---|
| 540 |
|
|---|
| 541 | mov byte [NAME(g_fInitialized)], -1
|
|---|
| 542 | call NAME(VBoxDrvRing0Init)
|
|---|
| 543 | cmp byte [NAME(g_fInitialized)], 1
|
|---|
| 544 | je VBoxDrvEP_Open
|
|---|
| 545 |
|
|---|
| 546 | VBoxDrvEP_OpenFailed:
|
|---|
| 547 | mov word [es:bx + PKTHDR.status], 0810fh ; error, done, init failed.
|
|---|
| 548 | jmp near VBoxDrvEP_Done
|
|---|
| 549 |
|
|---|
| 550 |
|
|---|
| 551 | ;
|
|---|
| 552 | ; Close Request.
|
|---|
| 553 | ;
|
|---|
| 554 | VBoxDrvEP_Close:
|
|---|
| 555 | ; First argument, the system file number.
|
|---|
| 556 | movzx eax, word [es:bx + PKTOPEN.sfn]
|
|---|
| 557 | push eax
|
|---|
| 558 |
|
|---|
| 559 | ; go to the 32-bit code
|
|---|
| 560 | ;jmp far dword NAME(VBoxDrvEP_Close_32) wrt FLAT
|
|---|
| 561 | db 066h
|
|---|
| 562 | db 0eah
|
|---|
| 563 | dd NAME(VBoxDrvEP_Close_32) ;wrt FLAT
|
|---|
| 564 | dw TEXT32 wrt FLAT
|
|---|
| 565 | segment TEXT32
|
|---|
| 566 | GLOBALNAME VBoxDrvEP_Close_32
|
|---|
| 567 |
|
|---|
| 568 | ; switch stack to 32-bit.
|
|---|
| 569 | mov ax, DATA32 wrt FLAT
|
|---|
| 570 | mov ds, ax
|
|---|
| 571 | mov es, ax
|
|---|
| 572 | call KernThunkStackTo32
|
|---|
| 573 |
|
|---|
| 574 | ; call the C code.
|
|---|
| 575 | call NAME(VBoxDrvClose)
|
|---|
| 576 |
|
|---|
| 577 | ; switch back the stack.
|
|---|
| 578 | push eax
|
|---|
| 579 | call KernThunkStackTo16
|
|---|
| 580 | pop eax
|
|---|
| 581 |
|
|---|
| 582 | ; jump back to the 16-bit code.
|
|---|
| 583 | ;jmp far dword NAME(VBoxDrvEP_Close_32) wrt CODE16
|
|---|
| 584 | db 066h
|
|---|
| 585 | db 0eah
|
|---|
| 586 | dw NAME(VBoxDrvEP_Close_16) wrt CODE16
|
|---|
| 587 | dw CODE16
|
|---|
| 588 | segment CODE16
|
|---|
| 589 | GLOBALNAME VBoxDrvEP_Close_16
|
|---|
| 590 | les bx, [bp - 4] ; Reload the packet pointer.
|
|---|
| 591 | or eax, eax
|
|---|
| 592 | jnz near VBoxDrvEP_GeneralFailure
|
|---|
| 593 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 594 | jmp near VBoxDrvEP_Done
|
|---|
| 595 |
|
|---|
| 596 |
|
|---|
| 597 | ;
|
|---|
| 598 | ; Init Request.
|
|---|
| 599 | ; The other driver header will do this.
|
|---|
| 600 | ;
|
|---|
| 601 | VBoxDrvEP_Init:
|
|---|
| 602 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 603 | mov byte [es:bx + PKTINITOUT.cUnits], 0
|
|---|
| 604 | mov word [es:bx + PKTINITOUT.cbCode16], NAME(g_InitCodeStart) wrt CODE16
|
|---|
| 605 | mov word [es:bx + PKTINITOUT.cbData16], NAME(g_InitDataStart) wrt DATA16
|
|---|
| 606 | mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
|
|---|
| 607 | jmp near VBoxDrvEP_Done
|
|---|
| 608 |
|
|---|
| 609 |
|
|---|
| 610 | ;
|
|---|
| 611 | ; Read Request.
|
|---|
| 612 | ; Return log data.
|
|---|
| 613 | ;
|
|---|
| 614 | VBoxDrvEP_Read:
|
|---|
| 615 | ; Any log data available?
|
|---|
| 616 | xor dx, dx
|
|---|
| 617 | mov ax, [NAME(g_offLogTail)]
|
|---|
| 618 | cmp ax, [NAME(g_offLogHead)]
|
|---|
| 619 | jz near .log_done
|
|---|
| 620 |
|
|---|
| 621 | ; create a temporary mapping of the physical buffer. Docs claims it trashes nearly everything...
|
|---|
| 622 | push ebp
|
|---|
| 623 | mov cx, [es:bx + PKTRW.cbTrans]
|
|---|
| 624 | push cx
|
|---|
| 625 | mov ax, [es:bx + PKTRW.PhysTrans + 2]
|
|---|
| 626 | mov bx, [es:bx + PKTRW.PhysTrans]
|
|---|
| 627 | mov dh, 1
|
|---|
| 628 | mov dl, DevHlp_PhysToVirt
|
|---|
| 629 | call far [NAME(g_fpfnDevHlp)]
|
|---|
| 630 | pop bx ; bx = cbTrans
|
|---|
| 631 | pop ebp
|
|---|
| 632 | jc near .log_phystovirt_failed
|
|---|
| 633 | ; es:di -> the output buffer.
|
|---|
| 634 |
|
|---|
| 635 | ; setup the copy operation.
|
|---|
| 636 | mov ax, [NAME(g_offLogTail)]
|
|---|
| 637 | xor dx, dx ; dx tracks the number of bytes copied.
|
|---|
| 638 | .log_loop:
|
|---|
| 639 | mov cx, [NAME(g_offLogHead)]
|
|---|
| 640 | cmp ax, cx
|
|---|
| 641 | je .log_done
|
|---|
| 642 | jb .log_loop_before
|
|---|
| 643 | mov cx, LOG_SIZE
|
|---|
| 644 | .log_loop_before: ; cx = end offset
|
|---|
| 645 | sub cx, ax ; cx = sequential bytes to copy.
|
|---|
| 646 | cmp cx, bx
|
|---|
| 647 | jbe .log_loop_min
|
|---|
| 648 | mov cx, bx ; output buffer is smaller than available data.
|
|---|
| 649 | .log_loop_min:
|
|---|
| 650 | mov si, NAME(g_szLog)
|
|---|
| 651 | add si, ax ; ds:si -> the log buffer.
|
|---|
| 652 | add dx, cx ; update output counter
|
|---|
| 653 | add ax, cx ; calc new offLogTail
|
|---|
| 654 | and ax, LOG_SIZE - 1
|
|---|
| 655 | rep movsb ; do the copy
|
|---|
| 656 | mov [NAME(g_offLogTail)], ax ; commit the read.
|
|---|
| 657 | jmp .log_loop
|
|---|
| 658 |
|
|---|
| 659 | .log_done:
|
|---|
| 660 | les bx, [bp - 4] ; Reload the packet pointer.
|
|---|
| 661 | mov word [es:bx + PKTRW.cbTrans], dx
|
|---|
| 662 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 663 | jmp near VBoxDrvEP_Done
|
|---|
| 664 |
|
|---|
| 665 | .log_phystovirt_failed:
|
|---|
| 666 | les bx, [bp - 4] ; Reload the packet pointer.
|
|---|
| 667 | jmp VBoxDrvEP_GeneralFailure
|
|---|
| 668 |
|
|---|
| 669 |
|
|---|
| 670 | ;
|
|---|
| 671 | ; Return 'unknown command' error.
|
|---|
| 672 | ;
|
|---|
| 673 | VBoxDrvEP_NotSupported:
|
|---|
| 674 | mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
|
|---|
| 675 | jmp VBoxDrvEP_Done
|
|---|
| 676 |
|
|---|
| 677 | ;
|
|---|
| 678 | ; Return 'general failure' error.
|
|---|
| 679 | ;
|
|---|
| 680 | VBoxDrvEP_GeneralFailure:
|
|---|
| 681 | mov word [es:bx + PKTHDR.status], 0810ch ; error, done, general failure.
|
|---|
| 682 | jmp VBoxDrvEP_Done
|
|---|
| 683 |
|
|---|
| 684 | ;
|
|---|
| 685 | ; Non-optimized return path.
|
|---|
| 686 | ;
|
|---|
| 687 | VBoxDrvEP_Done:
|
|---|
| 688 | mov sp, bp
|
|---|
| 689 | pop ebp
|
|---|
| 690 | retf
|
|---|
| 691 | ENDPROC VBoxDrvEP
|
|---|
| 692 |
|
|---|
| 693 |
|
|---|
| 694 | ;;
|
|---|
| 695 | ; The helper device entry point.
|
|---|
| 696 | ;
|
|---|
| 697 | ; This is only used to do the DosOpen on the main driver so we can
|
|---|
| 698 | ; do ring-3 init and report failures.
|
|---|
| 699 | ;
|
|---|
| 700 | GLOBALNAME VBoxDrvInitEP
|
|---|
| 701 | ; The only request we're servicing is the 'init' one.
|
|---|
| 702 | cmp word [es:bx + PKTHDR.cmd], 0
|
|---|
| 703 | je near NAME(VBoxDrvInitEPServiceInitReq)
|
|---|
| 704 |
|
|---|
| 705 | ; Ok, it's not the init request, just fail it.
|
|---|
| 706 | mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
|
|---|
| 707 | retf
|
|---|
| 708 |
|
|---|
| 709 |
|
|---|
| 710 | ;
|
|---|
| 711 | ; The 16-bit init code.
|
|---|
| 712 | ;
|
|---|
| 713 | segment CODE16_INIT
|
|---|
| 714 | GLOBALNAME g_InitCodeStart
|
|---|
| 715 |
|
|---|
| 716 | ;; The device name for DosOpen.
|
|---|
| 717 | g_szDeviceName:
|
|---|
| 718 | db '\DEV\vboxdrv$', 0
|
|---|
| 719 |
|
|---|
| 720 | ; icsdebug can't see where stuff starts otherwise. (kDevTest)
|
|---|
| 721 | int3
|
|---|
| 722 | int3
|
|---|
| 723 | int3
|
|---|
| 724 | int3
|
|---|
| 725 | int3
|
|---|
| 726 | int3
|
|---|
| 727 |
|
|---|
| 728 | ;;
|
|---|
| 729 | ; The Ring-3 init code.
|
|---|
| 730 | ;
|
|---|
| 731 | BEGINPROC VBoxDrvInitEPServiceInitReq
|
|---|
| 732 | push ebp
|
|---|
| 733 | mov ebp, esp
|
|---|
| 734 | push es ; bp - 2
|
|---|
| 735 | push sp ; bp - 4
|
|---|
| 736 | push -1 ; bp - 6: hfOpen
|
|---|
| 737 | push 0 ; bp - 8: usAction
|
|---|
| 738 | and sp, 0fffch
|
|---|
| 739 |
|
|---|
| 740 | ; check for the init package.
|
|---|
| 741 | cmp word [es:bx + PKTHDR.cmd], 0
|
|---|
| 742 | jne near .not_init
|
|---|
| 743 |
|
|---|
| 744 | ;
|
|---|
| 745 | ; Copy the data out of the init packet.
|
|---|
| 746 | ;
|
|---|
| 747 | mov eax, [es:bx + PKTINITIN.fpfnDevHlp]
|
|---|
| 748 | mov [NAME(g_fpfnDevHlp)], eax
|
|---|
| 749 | mov edx, [es:bx + PKTINITIN.fpszArgs]
|
|---|
| 750 | mov [g_fpszArgs], edx
|
|---|
| 751 |
|
|---|
| 752 | ;
|
|---|
| 753 | ; Open the first driver, close it, and check status.
|
|---|
| 754 | ;
|
|---|
| 755 |
|
|---|
| 756 | ; APIRET _Pascal DosOpen(PSZ pszFname, PHFILE phfOpen, PUSHORT pusAction,
|
|---|
| 757 | ; ULONG ulFSize, USHORT usAttr, USHORT fsOpenFlags,
|
|---|
| 758 | ; USHORT fsOpenMode, ULONG ulReserved);
|
|---|
| 759 | push seg g_szDeviceName ; pszFname
|
|---|
| 760 | push g_szDeviceName
|
|---|
| 761 | push ss ; phfOpen
|
|---|
| 762 | lea dx, [bp - 6]
|
|---|
| 763 | push dx
|
|---|
| 764 | push ss ; pusAction
|
|---|
| 765 | lea dx, [bp - 8]
|
|---|
| 766 | push dx
|
|---|
| 767 | push dword 0 ; ulFSize
|
|---|
| 768 | push 0 ; usAttr = FILE_NORMAL
|
|---|
| 769 | push 1 ; fsOpenFlags = FILE_OPEN
|
|---|
| 770 | push 00040h ; fsOpenMode = OPEN_SHARE_DENYNONE | OPEN_ACCESS_READONLY
|
|---|
| 771 | push dword 0 ; ulReserved
|
|---|
| 772 | call far DOS16OPEN
|
|---|
| 773 |
|
|---|
| 774 | push ax ; Quickly flush any text.
|
|---|
| 775 | call NAME(VBoxDrvInitFlushText)
|
|---|
| 776 | pop ax
|
|---|
| 777 |
|
|---|
| 778 | or ax, ax
|
|---|
| 779 | jnz .done_err
|
|---|
| 780 |
|
|---|
| 781 | ; APIRET APIENTRY DosClose(HFILE hf);
|
|---|
| 782 | mov cx, [bp - 6]
|
|---|
| 783 | push cx
|
|---|
| 784 | call far DOS16CLOSE
|
|---|
| 785 | or ax, ax
|
|---|
| 786 | jnz .done_err ; This can't happen (I hope).
|
|---|
| 787 |
|
|---|
| 788 | ;
|
|---|
| 789 | ; Ok, we're good.
|
|---|
| 790 | ;
|
|---|
| 791 | mov word [es:bx + PKTHDR.status], 00100h ; done, ok.
|
|---|
| 792 | mov byte [es:bx + PKTINITOUT.cUnits], 0
|
|---|
| 793 | mov word [es:bx + PKTINITOUT.cbCode16], NAME(g_InitCodeStart) wrt CODE16
|
|---|
| 794 | mov word [es:bx + PKTINITOUT.cbData16], NAME(g_InitDataStart) wrt DATA16
|
|---|
| 795 | mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
|
|---|
| 796 | jmp .done
|
|---|
| 797 |
|
|---|
| 798 | ;
|
|---|
| 799 | ; Init failure.
|
|---|
| 800 | ;
|
|---|
| 801 | .done_err:
|
|---|
| 802 | mov word [es:bx + PKTHDR.status], 0810fh ; error, done, init failed.
|
|---|
| 803 | mov byte [es:bx + PKTINITOUT.cUnits], 0
|
|---|
| 804 | mov word [es:bx + PKTINITOUT.cbCode16], 0
|
|---|
| 805 | mov word [es:bx + PKTINITOUT.cbData16], 0
|
|---|
| 806 | mov dword [es:bx + PKTINITOUT.fpaBPBs], 0
|
|---|
| 807 | jmp .done
|
|---|
| 808 |
|
|---|
| 809 | ;
|
|---|
| 810 | ; Not init, return 'unknown command'.
|
|---|
| 811 | ;
|
|---|
| 812 | .not_init:
|
|---|
| 813 | mov word [es:bx + PKTHDR.status], 08103h ; error, done, unknown command.
|
|---|
| 814 | jmp .done
|
|---|
| 815 |
|
|---|
| 816 | ;
|
|---|
| 817 | ; Request done.
|
|---|
| 818 | ;
|
|---|
| 819 | .done:
|
|---|
| 820 | mov sp, bp
|
|---|
| 821 | pop ebp
|
|---|
| 822 | retf
|
|---|
| 823 | ENDPROC VBoxDrvInitEPServiceInitReq
|
|---|
| 824 |
|
|---|
| 825 |
|
|---|
| 826 | ;;
|
|---|
| 827 | ; The Ring-0 init code.
|
|---|
| 828 | ;
|
|---|
| 829 | BEGINPROC VBoxDrvRing0Init
|
|---|
| 830 | push es
|
|---|
| 831 | push esi
|
|---|
| 832 | push ebp
|
|---|
| 833 | mov ebp, esp
|
|---|
| 834 | and sp, 0fffch
|
|---|
| 835 |
|
|---|
| 836 | ;
|
|---|
| 837 | ; Thunk the argument string pointer first.
|
|---|
| 838 | ;
|
|---|
| 839 | movzx esi, word [g_fpszArgs] ; offset
|
|---|
| 840 | mov ax, [g_fpszArgs + 2] ; selector
|
|---|
| 841 | mov dl, DevHlp_VirtToLin
|
|---|
| 842 | call far [NAME(g_fpfnDevHlp)]
|
|---|
| 843 | jc near VBoxDrvRing0Init_done ; eax is non-zero on failure (can't happen)
|
|---|
| 844 | push eax ; 00h - pszArgs (for VBoxDrvInit).
|
|---|
| 845 |
|
|---|
| 846 | ;
|
|---|
| 847 | ; Do 16-bit init?
|
|---|
| 848 | ;
|
|---|
| 849 |
|
|---|
| 850 |
|
|---|
| 851 | ;
|
|---|
| 852 | ; Do 32-bit init
|
|---|
| 853 | ;
|
|---|
| 854 | ;jmp far dword NAME(VBoxDrvRing0Init_32) wrt FLAT
|
|---|
| 855 | db 066h
|
|---|
| 856 | db 0eah
|
|---|
| 857 | dd NAME(VBoxDrvRing0Init_32) ;wrt FLAT
|
|---|
| 858 | dw TEXT32 wrt FLAT
|
|---|
| 859 | segment TEXT32
|
|---|
| 860 | GLOBALNAME VBoxDrvRing0Init_32
|
|---|
| 861 |
|
|---|
| 862 | ; switch stack to 32-bit.
|
|---|
| 863 | mov ax, DATA32 wrt FLAT
|
|---|
| 864 | mov ds, ax
|
|---|
| 865 | mov es, ax
|
|---|
| 866 | call KernThunkStackTo32
|
|---|
| 867 |
|
|---|
| 868 | ; call the C code.
|
|---|
| 869 | call NAME(VBoxDrvInit)
|
|---|
| 870 |
|
|---|
| 871 | ; switch back the stack and reload ds.
|
|---|
| 872 | push eax
|
|---|
| 873 | call KernThunkStackTo16
|
|---|
| 874 | pop eax
|
|---|
| 875 |
|
|---|
| 876 | mov dx, seg NAME(g_fInitialized)
|
|---|
| 877 | mov ds, dx
|
|---|
| 878 |
|
|---|
| 879 | ; jump back to the 16-bit code.
|
|---|
| 880 | ;jmp far dword NAME(VBoxDrvRing0Init_16) wrt CODE16
|
|---|
| 881 | db 066h
|
|---|
| 882 | db 0eah
|
|---|
| 883 | dw NAME(VBoxDrvRing0Init_16) wrt CODE16
|
|---|
| 884 | dw CODE16_INIT
|
|---|
| 885 | segment CODE16_INIT
|
|---|
| 886 | GLOBALNAME VBoxDrvRing0Init_16
|
|---|
| 887 |
|
|---|
| 888 | ; check the result and set g_fInitialized on success.
|
|---|
| 889 | or eax, eax
|
|---|
| 890 | jnz VBoxDrvRing0Init_done
|
|---|
| 891 | mov byte [NAME(g_fInitialized)], 1
|
|---|
| 892 |
|
|---|
| 893 | VBoxDrvRing0Init_done:
|
|---|
| 894 | mov sp, bp
|
|---|
| 895 | pop ebp
|
|---|
| 896 | pop esi
|
|---|
| 897 | pop es
|
|---|
| 898 | ret
|
|---|
| 899 | ENDPROC VBoxDrvRing0Init
|
|---|
| 900 |
|
|---|
| 901 |
|
|---|
| 902 | ;;
|
|---|
| 903 | ; Flush any text in the text buffer.
|
|---|
| 904 | ;
|
|---|
| 905 | BEGINPROC VBoxDrvInitFlushText
|
|---|
| 906 | push bp
|
|---|
| 907 | mov bp, sp
|
|---|
| 908 |
|
|---|
| 909 | ; Anything in the buffer?
|
|---|
| 910 | mov ax, [NAME(g_cchInitText)]
|
|---|
| 911 | or ax, ax
|
|---|
| 912 | jz .done
|
|---|
| 913 |
|
|---|
| 914 | %if 1
|
|---|
| 915 | ; Write it to STDOUT.
|
|---|
| 916 | ; APIRET _Pascal DosWrite(HFILE hf, PVOID pvBuf, USHORT cbBuf, PUSHORT pcbBytesWritten);
|
|---|
| 917 | push ax ; bp - 2 : cbBytesWritten
|
|---|
| 918 | mov cx, sp
|
|---|
| 919 | push 1 ; STDOUT
|
|---|
| 920 | push seg NAME(g_szInitText) ; pvBuf
|
|---|
| 921 | push NAME(g_szInitText)
|
|---|
| 922 | push ax ; cbBuf
|
|---|
| 923 | push ss ; pcbBytesWritten
|
|---|
| 924 | push cx
|
|---|
| 925 | %if 0 ; wlink generates a non-aliased fixup here which results in 16-bit offset with the flat 32-bit selector.
|
|---|
| 926 | call far DOS16WRITE
|
|---|
| 927 | %else
|
|---|
| 928 | ; convert flat pointer to a far pointer using the tiled algorithm.
|
|---|
| 929 | push ds
|
|---|
| 930 | mov ax, DATA32 wrt FLAT
|
|---|
| 931 | mov ds, ax
|
|---|
| 932 | mov eax, g_pfnDos16Write wrt FLAT
|
|---|
| 933 | movzx eax, word [eax + 2] ; High word of the flat address (in DATA32).
|
|---|
| 934 | shl ax, 3
|
|---|
| 935 | or ax, 0007h
|
|---|
| 936 | pop ds
|
|---|
| 937 | mov [NAME(g_fpfnDos16Write) + 2], ax ; Update the selector (in DATA16_INIT).
|
|---|
| 938 | ; do the call
|
|---|
| 939 | call far [NAME(g_fpfnDos16Write)]
|
|---|
| 940 | %endif
|
|---|
| 941 |
|
|---|
| 942 | %else ; alternative workaround for the wlink issue.
|
|---|
| 943 | ; Use the save message devhlp.
|
|---|
| 944 | push esi
|
|---|
| 945 | push ebx
|
|---|
| 946 | xor bx, bx
|
|---|
| 947 | mov si, NAME(g_MsgTab)
|
|---|
| 948 | mov dx, seg NAME(g_MsgTab)
|
|---|
| 949 | mov ds, dx
|
|---|
| 950 | mov dl, DevHlp_SAVE_MESSAGE
|
|---|
| 951 | call far [NAME(g_fpfnDevHlp)]
|
|---|
| 952 | pop ebx
|
|---|
| 953 | pop esi
|
|---|
| 954 | %endif
|
|---|
| 955 |
|
|---|
| 956 | ; Empty the buffer.
|
|---|
| 957 | mov word [NAME(g_cchInitText)], 0
|
|---|
| 958 | mov byte [NAME(g_szInitText)], 0
|
|---|
| 959 |
|
|---|
| 960 | .done:
|
|---|
| 961 | mov sp, bp
|
|---|
| 962 | pop bp
|
|---|
| 963 | ret
|
|---|
| 964 | ENDPROC VBoxDrvInitFlushText
|
|---|
| 965 |
|
|---|
| 966 |
|
|---|
| 967 |
|
|---|
| 968 | ;;
|
|---|
| 969 | ; This must be present
|
|---|
| 970 | segment DATA32
|
|---|
| 971 | g_pfnDos16Write:
|
|---|
| 972 | dd DOS16WRITE ; flat
|
|---|
| 973 |
|
|---|
| 974 |
|
|---|
