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|
; $Id: RTR0Os2DHVMGlobalToProcess.asm $
;; @file
; IPRT - DevHelp_VMGlobalToProcess, Ring-0 Driver, OS/2.
;
;
; Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
;
; Permission is hereby granted, free of charge, to any person
; obtaining a copy of this software and associated documentation
; files (the "Software"), to deal in the Software without
; restriction, including without limitation the rights to use,
; copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following
; conditions:
;
; The above copyright notice and this permission notice shall be
; included in all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
; OTHER DEALINGS IN THE SOFTWARE.
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%define RT_INCL_16BIT_SEGMENTS
%include "iprt/asmdefs.mac"
%include "iprt/err.mac"
;*******************************************************************************
;* External Symbols *
;*******************************************************************************
extern KernThunkStackTo32
extern KernThunkStackTo16
extern NAME(g_fpfnDevHlp)
;*******************************************************************************
;* Defined Constants And Macros *
;*******************************************************************************
%define DevHlp_VMGlobalToProcess 05ah
BEGINCODE
;;
; VMGlobalToProcess wrapper.
;
; @param fFlags [ebp + 08h] Flags
; @param pvR0 [ebp + 0ch] Ring-0 memory.
; @param cb [ebp + 10h] Size of memory object to map.
; @param ppR3 [ebp + 14h] Where to store the address of the ring-3 mapping.
;
BEGINPROC_EXPORTED RTR0Os2DHVMGlobalToProcess
; switch stack first.
call KernThunkStackTo16
; normal prolog.
push ebp
mov ebp, esp
push dword [NAME(g_fpfnDevHlp)] ; ebp - 4
push ebx ; save ebx
; setup the devhelp call
mov eax, [ebp + 08h] ; fFlags
mov ebx, [ebp + 0ch] ; pvR0
mov ecx, [ebp + 10h] ; cb
mov dl, DevHlp_VMGlobalToProcess
; jump to the 16-bit code.
;jmp far dword NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
db 066h
db 0eah
dw NAME(RTR0Os2DHVMGlobalToProcess_16) wrt CODE16
dw CODE16
BEGINCODE16
GLOBALNAME RTR0Os2DHVMGlobalToProcess_16
call far [ss:ebp - 4]
;jmp far dword NAME(RTR0Os2DHVMGlobalToProcess_32) wrt FLAT
db 066h
db 0eah
dd NAME(RTR0Os2DHVMGlobalToProcess_32) ;wrt FLAT
dw TEXT32 wrt FLAT
BEGINCODE
GLOBALNAME RTR0Os2DHVMGlobalToProcess_32
jc .done
; save the result.
mov edx, [ebp + 14h] ; ppvR3
mov [edx], eax
xor eax, eax
.done:
pop ebx
leave
; switch stack back and return.
push eax
call KernThunkStackTo32
pop eax
ret
ENDPROC RTR0Os2DHVMGlobalToProcess
|
