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; $Id: RTR0Os2DHQueryDOSVar.asm 8256 2008-04-21 20:53:28Z vboxsync $
;; @file
; IPRT - DevHelp_GetDOSVar, Ring-0 Driver, OS/2.
;
;
; Copyright (c) 1999-2007 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_GetDOSVar 24h
BEGINCODE
;
; Jump table used by RTR0Os2DHQueryDOSVar
;
DosVarJumpTab:
dd 0 ; 0 - Reserved
dd Load1600 ; 1 - GIS
dd Load1616 ; 2 - LIS
dd 0 ; 3 - Reserved
dd Load1616 ; 4 - VectorSDF
dd Load1616 ; 5 - VectorReboot
dd Load1616 ; 6 - VectorMSATS
dd AsIs ; 7 - YieldFlag (Resched)
dd AsIs ; 8 - TCYieldFlag (TCResched)
dd AsIs ; 9 - DOSTable
dd Load1616 ; a - VectorDEKKO
dd AsIs ; b - CodePgBuff
dd Load1616 ; c - VectorRIPL
dd AsIs ; d - InterruptLevel
dd AsIs ; e - DevClassTables
dd AsIs ; f - DMQS_Sel
dd AsIs ;10 - APMInfo
dd LoadWord ;11 - APM_Length (length of above structure)
DosVarJumpTabEnd:
%define DosVarJumpTabSize (DosVarJumpTabEnd - DosVarJumpTab) / 4
;;
; Unified DevHelp_GetDOSVar -> Far 16:16 pointer wrapper.
;
; @param iVar [ebp + 08h] Variable.
; @param iMember [ebp + 0ch] Member.
; @param pfp [ebp + 10h] Where to store the variable address (pointer to 16:16).
;
BEGINPROC_EXPORTED RTR0Os2DHQueryDOSVar
; switch stack first.
call KernThunkStackTo16
; normal prolog.
push ebp
mov ebp, esp
push dword [NAME(g_fpfnDevHlp)] ; ebp - 4
push ebx ; save ebx
push es ; save es
; setup the devhelp call and switch to
mov eax, [ebp + 08h] ; iVar (8-bit)
mov ecx, [ebp + 0ch] ; iMember (16-bit)
mov dl, DevHlp_GetDOSVar
; jump to the 16-bit code.
;jmp far dword NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
db 066h
db 0eah
dw NAME(RTR0Os2DHQueryDOSVar_16) wrt CODE16
dw CODE16
BEGINCODE16
GLOBALNAME RTR0Os2DHQueryDOSVar_16
call far [ss:ebp - 4]
;jmp far dword NAME(RTR0Os2DHQueryDOSVar) wrt FLAT
db 066h
db 0eah
dd NAME(RTR0Os2DHQueryDOSVar_32) ;wrt FLAT
dw TEXT32 wrt FLAT
BEGINCODE
GLOBALNAME RTR0Os2DHQueryDOSVar_32
jc Error1
;
; Make ax:ebx contain the pointer and take action according
; to the variable jump table.
;
and ebx, 0000ffffh ; clean high part of ebx
movzx ecx, byte [ebp + 08] ; iVar
cmp ecx, DosVarJumpTabSize
jg Error2
jmp [DosVarJumpTab + ecx * 4]
; Load Word at ax:ebx.
LoadWord:
mov es, ax
movzx edx, word [es:ebx]
jmp StoreIt
; Load selector at ax:ebx.
Load1600:
mov es, ax
movzx edx, word [es:ebx]
shl edx, 16
jmp StoreIt
; Load 16:16 ptr at ax:ebx.
Load1616:
mov es, ax
mov edx, dword [es:ebx]
jmp StoreIt
; Move ax:bx into edx.
AsIs:
mov dx, ax
shl edx, 16
mov dx, bx
jmp StoreIt
Error2:
mov eax, VERR_INVALID_PARAMETER
jmp Done
Error1:
mov eax, VERR_GENERAL_FAILURE
jmp Done
StoreIt:
mov ecx, [ebp + 10h]
mov [ecx], edx
xor eax, eax ; return success (VINF_SUCCESS == 0)
Done:
pop es
pop ebx
leave
; switch stack back and return.
push eax
call KernThunkStackTo32
pop eax
ret
ENDPROC RTR0Os2DHQueryDOSVar
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