| 1 | ; $Id: RTR0Os2DHVMGlobalToProcess.asm 8256 2008-04-21 20:53:28Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - DevHelp_VMGlobalToProcess, 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 | ; 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 | %include "iprt/err.mac"
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| 38 |
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| 39 |
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| 40 | ;*******************************************************************************
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| 41 | ;* External Symbols *
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| 42 | ;*******************************************************************************
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| 43 | extern KernThunkStackTo32
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| 44 | extern KernThunkStackTo16
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| 45 | extern NAME(g_fpfnDevHlp)
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| 46 |
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| 47 |
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| 48 | ;*******************************************************************************
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| 49 | ;* Defined Constants And Macros *
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| 50 | ;*******************************************************************************
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| 51 | %define DevHlp_VMGlobalToProcess 05ah
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| 52 |
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| 53 |
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| 54 | BEGINCODE
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| 55 |
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| 56 | ;;
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| 57 | ; VMGlobalToProcess wrapper.
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| 58 | ;
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| 59 | ; @param fFlags [ebp + 08h] Flags
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| 60 | ; @param pvR0 [ebp + 0ch] Ring-0 memory.
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| 61 | ; @param cb [ebp + 10h] Size of memory object to map.
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| 62 | ; @param ppR3 [ebp + 14h] Where to store the address of the ring-3 mapping.
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| 63 | ;
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| 64 | BEGINPROC_EXPORTED RTR0Os2DHVMGlobalToProcess
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| 65 | ; switch stack first.
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| 66 | call KernThunkStackTo16
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| 67 |
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| 68 | ; normal prolog.
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| 69 | push ebp
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| 70 | mov ebp, esp
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| 71 | push dword [NAME(g_fpfnDevHlp)] ; ebp - 4
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| 72 | push ebx ; save ebx
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| 73 |
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| 74 | ; setup the devhelp call
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| 75 | mov eax, [ebp + 08h] ; fFlags
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| 76 | mov ebx, [ebp + 0ch] ; pvR0
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| 77 | mov ecx, [ebp + 10h] ; cb
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| 78 | mov dl, DevHlp_VMGlobalToProcess
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| 79 |
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| 80 | ; jump to the 16-bit code.
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| 81 | ;jmp far dword NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
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| 82 | db 066h
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| 83 | db 0eah
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| 84 | dw NAME(RTR0Os2DHVMGlobalToProcess_16) wrt CODE16
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| 85 | dw CODE16
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| 86 | BEGINCODE16
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| 87 | GLOBALNAME RTR0Os2DHVMGlobalToProcess_16
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| 88 | call far [ss:ebp - 4]
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| 89 |
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| 90 | ;jmp far dword NAME(RTR0Os2DHVMGlobalToProcess_32) wrt FLAT
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| 91 | db 066h
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| 92 | db 0eah
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| 93 | dd NAME(RTR0Os2DHVMGlobalToProcess_32) ;wrt FLAT
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| 94 | dw TEXT32 wrt FLAT
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| 95 | BEGINCODE
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| 96 | GLOBALNAME RTR0Os2DHVMGlobalToProcess_32
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| 97 | jc .done
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| 98 |
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| 99 | ; save the result.
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| 100 | mov edx, [ebp + 14h] ; ppvR3
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| 101 | mov [edx], eax
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| 102 | xor eax, eax
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| 103 |
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| 104 | .done:
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| 105 | pop ebx
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| 106 | leave
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| 107 |
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| 108 | ; switch stack back and return.
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| 109 | push eax
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| 110 | call KernThunkStackTo32
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| 111 | pop eax
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| 112 | ret
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| 113 | ENDPROC RTR0Os2DHVMGlobalToProcess
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| 114 |
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