; $Id$

;; @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