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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/r0drv/os2/RTR0Os2DHQueryDOSVar.asm | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/os2/RTR0Os2DHQueryDOSVar.asm b/src/VBox/Runtime/r0drv/os2/RTR0Os2DHQueryDOSVar.asm new file mode 100644 index 00000000..e0c94b7f --- /dev/null +++ b/src/VBox/Runtime/r0drv/os2/RTR0Os2DHQueryDOSVar.asm @@ -0,0 +1,183 @@ +; $Id: RTR0Os2DHQueryDOSVar.asm $ +;; @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 + |