mirror of
https://github.com/reactos/reactos.git
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182 lines
3.4 KiB
C
182 lines
3.4 KiB
C
/*
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* ReactOS W32 Subsystem
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* $Id$
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: GDI Driver Memory Management Functions
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* FILE: subsys/win32k/eng/mem.c
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* PROGRAMER: Jason Filby
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* REVISION HISTORY:
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* 3/7/1999: Created
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*/
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#include <w32k.h>
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#define NDEBUG
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#include <debug.h>
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/*
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* @implemented
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*/
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PVOID APIENTRY
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EngAllocMem(ULONG Flags,
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ULONG MemSize,
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ULONG Tag)
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{
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PVOID newMem;
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newMem = ExAllocatePoolWithTag(PagedPool, MemSize, Tag);
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if (Flags == FL_ZERO_MEMORY && NULL != newMem)
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{
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RtlZeroMemory(newMem, MemSize);
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}
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return newMem;
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}
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/*
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* @implemented
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*/
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VOID APIENTRY
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EngFreeMem(PVOID Mem)
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{
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ExFreePool(Mem);
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}
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/*
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* @implemented
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*/
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PVOID APIENTRY
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EngAllocUserMem(SIZE_T cj, ULONG Tag)
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{
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PVOID NewMem = NULL;
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NTSTATUS Status;
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SIZE_T MemSize = cj;
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Status = ZwAllocateVirtualMemory(NtCurrentProcess(), &NewMem, 0, &MemSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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if (! NT_SUCCESS(Status))
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{
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return NULL;
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}
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/* TODO: Add allocation info to AVL tree (stored inside W32PROCESS structure) */
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return NewMem;
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}
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/*
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* @implemented
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*/
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VOID APIENTRY
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EngFreeUserMem(PVOID pv)
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{
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PVOID BaseAddress = pv;
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SIZE_T MemSize = 0;
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ZwFreeVirtualMemory(NtCurrentProcess(), &BaseAddress, &MemSize, MEM_RELEASE);
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/* TODO: Remove allocation info from AVL tree */
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}
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PVOID
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APIENTRY
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HackSecureVirtualMemory(
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IN PVOID Address,
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IN SIZE_T Size,
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IN ULONG ProbeMode,
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OUT PVOID *SafeAddress)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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PMDL mdl;
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LOCK_OPERATION Operation;
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if (ProbeMode == PAGE_READONLY) Operation = IoReadAccess;
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else if (ProbeMode == PAGE_READWRITE) Operation = IoModifyAccess;
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else return NULL;
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mdl = IoAllocateMdl(Address, Size, FALSE, TRUE, NULL);
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if (mdl == NULL)
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{
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return NULL;
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}
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_SEH2_TRY
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{
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MmProbeAndLockPages(mdl, UserMode, Operation);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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Status = _SEH2_GetExceptionCode();
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}
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_SEH2_END
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if (!NT_SUCCESS(Status))
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{
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IoFreeMdl(mdl);
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return NULL;
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}
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*SafeAddress = MmGetSystemAddressForMdlSafe(mdl, NormalPagePriority);
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if(!*SafeAddress)
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{
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MmUnlockPages(mdl);
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IoFreeMdl(mdl);
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return NULL;
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}
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return mdl;
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}
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VOID
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APIENTRY
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HackUnsecureVirtualMemory(
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IN PVOID SecureHandle)
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{
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PMDL mdl = (PMDL)SecureHandle;
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MmUnlockPages(mdl);
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IoFreeMdl(mdl);
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}
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/*
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* @implemented
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*/
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HANDLE APIENTRY
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EngSecureMem(PVOID Address, ULONG Length)
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{
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return MmSecureVirtualMemory(Address, Length, PAGE_READWRITE);
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}
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/*
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* @implemented
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*/
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VOID APIENTRY
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EngUnsecureMem(HANDLE Mem)
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{
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MmUnsecureVirtualMemory((PVOID) Mem);
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}
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/* EOF */
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