2 * ReactOS W32 Subsystem
3 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * PURPOSE: GDI Driver Memory Management Functions
24 * FILE: subsys/win32k/eng/mem.c
25 * PROGRAMER: Jason Filby
39 EngAllocMem(ULONG Flags
,
45 newMem
= ExAllocatePoolWithTag(PagedPool
, MemSize
, Tag
);
47 if (Flags
== FL_ZERO_MEMORY
&& NULL
!= newMem
)
49 RtlZeroMemory(newMem
, MemSize
);
68 EngAllocUserMem(SIZE_T cj
, ULONG Tag
)
74 Status
= ZwAllocateVirtualMemory(NtCurrentProcess(), &NewMem
, 0, &MemSize
, MEM_COMMIT
| MEM_RESERVE
, PAGE_READWRITE
);
76 if (! NT_SUCCESS(Status
))
81 /* TODO: Add allocation info to AVL tree (stored inside W32PROCESS structure) */
90 EngFreeUserMem(PVOID pv
)
92 PVOID BaseAddress
= pv
;
95 ZwFreeVirtualMemory(NtCurrentProcess(), &BaseAddress
, &MemSize
, MEM_RELEASE
);
97 /* TODO: Remove allocation info from AVL tree */
104 HackSecureVirtualMemory(
108 OUT PVOID
*SafeAddress
)
110 NTSTATUS Status
= STATUS_SUCCESS
;
112 LOCK_OPERATION Operation
;
114 if (ProbeMode
== PAGE_READONLY
) Operation
= IoReadAccess
;
115 else if (ProbeMode
== PAGE_READWRITE
) Operation
= IoModifyAccess
;
118 mdl
= IoAllocateMdl(Address
, Size
, FALSE
, TRUE
, NULL
);
126 MmProbeAndLockPages(mdl
, UserMode
, Operation
);
128 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
130 Status
= _SEH2_GetExceptionCode();
134 if (!NT_SUCCESS(Status
))
140 *SafeAddress
= MmGetSystemAddressForMdlSafe(mdl
, NormalPagePriority
);
154 HackUnsecureVirtualMemory(
155 IN PVOID SecureHandle
)
157 PMDL mdl
= (PMDL
)SecureHandle
;
167 EngSecureMem(PVOID Address
, ULONG Length
)
169 return MmSecureVirtualMemory(Address
, Length
, PAGE_READWRITE
);
176 EngUnsecureMem(HANDLE Mem
)
178 MmUnsecureVirtualMemory((PVOID
) Mem
);