ReactOS  0.4.15-dev-5126-g3bb451b
memory.h File Reference
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Macros

#define TOTAL_PAGES   (MAX_ADDRESS / PAGE_SIZE)
 

Typedefs

typedef VOID(FASTCALLPMEMORY_READ_HANDLER) (ULONG Address, PVOID Buffer, ULONG Size)
 
typedef BOOLEAN(FASTCALLPMEMORY_WRITE_HANDLER) (ULONG Address, PVOID Buffer, ULONG Size)
 

Functions

BOOLEAN MemInitialize (VOID)
 
VOID MemCleanup (VOID)
 
VOID MemExceptionHandler (ULONG FaultAddress, BOOLEAN Writing)
 
VOID FASTCALL EmulatorReadMemory (PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 
VOID FASTCALL EmulatorWriteMemory (PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
 
VOID FASTCALL EmulatorCopyMemory (PFAST486_STATE State, ULONG DestAddress, ULONG SrcAddress, ULONG Size)
 
VOID EmulatorSetA20 (BOOLEAN Enabled)
 
BOOLEAN EmulatorGetA20 (VOID)
 
BOOL MemInstallFastMemoryHook (PVOID Address, ULONG Size, PMEMORY_READ_HANDLER ReadHandler, PMEMORY_WRITE_HANDLER WriteHandler)
 
BOOL MemRemoveFastMemoryHook (PVOID Address, ULONG Size)
 
BOOLEAN MemQueryMemoryZone (ULONG StartAddress, PULONG Length, PBOOLEAN Hooked)
 

Macro Definition Documentation

◆ TOTAL_PAGES

#define TOTAL_PAGES   (MAX_ADDRESS / PAGE_SIZE)

Definition at line 14 of file memory.h.

Typedef Documentation

◆ PMEMORY_READ_HANDLER

typedef VOID(FASTCALL * PMEMORY_READ_HANDLER) (ULONG Address, PVOID Buffer, ULONG Size)

Definition at line 18 of file memory.h.

◆ PMEMORY_WRITE_HANDLER

typedef BOOLEAN(FASTCALL * PMEMORY_WRITE_HANDLER) (ULONG Address, PVOID Buffer, ULONG Size)

Definition at line 26 of file memory.h.

Function Documentation

◆ EmulatorCopyMemory()

VOID FASTCALL EmulatorCopyMemory ( PFAST486_STATE  State,
ULONG  DestAddress,
ULONG  SrcAddress,
ULONG  Size 
)

Definition at line 219 of file memory.c.

220 {
221  /*
222  * Guest-to-guest memory copy
223  */
224 
225  // FIXME: This is a temporary implementation of a more useful functionality
226  // which should be a merge of EmulatorReadMemory & EmulatorWriteMemory without
227  // any local external buffer.
228  // NOTE: Process heap is by default serialized (unless one specifies it shouldn't).
229  static BYTE StaticBuffer[8192]; // Smallest static buffer we can use.
230  static PVOID HeapBuffer = NULL; // Always-growing heap buffer. Use it in case StaticBuffer is too small.
231  static ULONG HeapBufferSize = 0;
232  PVOID LocalBuffer; // Points to either StaticBuffer or HeapBuffer
233 
234  if (Size <= sizeof(StaticBuffer))
235  {
236  /* Use the static buffer */
237  LocalBuffer = StaticBuffer;
238  }
239  else if (/* sizeof(StaticBuffer) <= Size && */ Size <= HeapBufferSize)
240  {
241  /* Use the heap buffer */
242  ASSERT(HeapBufferSize > 0 && HeapBuffer != NULL);
243  LocalBuffer = HeapBuffer;
244  }
245  else // if (Size > HeapBufferSize)
246  {
247  /* Enlarge the heap buffer and use it */
248 
249  if (HeapBuffer == NULL)
250  {
251  /* First allocation */
252  LocalBuffer = RtlAllocateHeap(RtlGetProcessHeap(), 0, Size);
253  }
254  else
255  {
256  /* Reallocation */
257  LocalBuffer = RtlReAllocateHeap(RtlGetProcessHeap(), 0 /* HEAP_GENERATE_EXCEPTIONS */, HeapBuffer, Size);
258  }
259  ASSERT(LocalBuffer != NULL); // We must succeed! TODO: Handle it more properly.
260  HeapBuffer = LocalBuffer; // HeapBuffer is now reallocated.
261  HeapBufferSize = Size;
262  }
263 
264  /* Perform memory copy */
265  EmulatorReadMemory( State, SrcAddress , LocalBuffer, Size);
266  EmulatorWriteMemory(State, DestAddress, LocalBuffer, Size);
267 
268  // if (LocalBuffer != StaticBuffer)
269  // RtlFreeHeap(RtlGetProcessHeap(), 0, LocalBuffer);
270 
271  // Note that we don't free HeapBuffer since it's an always-growing buffer.
272  // It is freed when NTVDM termiantes.
273 }
IN PVOID IN PVOID IN USHORT IN USHORT Size
Definition: pci.h:361
VOID FASTCALL EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
Definition: memory.c:186
PVOID NTAPI RtlAllocateHeap(IN PVOID HeapHandle, IN ULONG Flags, IN SIZE_T Size)
Definition: heap.c:588
#define ASSERT(a)
Definition: mode.c:44
unsigned char BYTE
Definition: xxhash.c:193
#define NULL
Definition: types.h:112
unsigned int ULONG
Definition: retypes.h:1
NTSYSAPI PVOID WINAPI RtlReAllocateHeap(HANDLE, ULONG, PVOID, SIZE_T)
Definition: heap.c:2667
VOID FASTCALL EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
Definition: memory.c:142

Referenced by VidBiosScrollWindow().

◆ EmulatorGetA20()

BOOLEAN EmulatorGetA20 ( VOID  )

Definition at line 280 of file memory.c.

281 {
282  return A20Line;
283 }
static BOOLEAN A20Line
Definition: memory.c:44

Referenced by PS2WriteControl(), and XmsBopProcedure().

◆ EmulatorReadMemory()

VOID FASTCALL EmulatorReadMemory ( PFAST486_STATE  State,
ULONG  Address,
PVOID  Buffer,
ULONG  Size 
)

Definition at line 142 of file memory.c.

143 {
144  ULONG i, Offset, Length;
145  ULONG FirstPage, LastPage;
146 
148 
149  /* Mirror 0x000FFFF0 at 0xFFFFFFF0 */
150  if (Address >= 0xFFFFFFF0) Address -= 0xFFF00000;
151 
152  /* If the A20 line is disabled, mask bit 20 */
153  if (!A20Line) Address &= ~(1 << 20);
154 
155  if ((Address + Size - 1) >= MAX_ADDRESS)
156  {
157  ULONG ExtraStart = (Address < MAX_ADDRESS) ? MAX_ADDRESS - Address : 0;
158 
159  /* Fill the memory that was above the limit with 0xFF */
160  RtlFillMemory((PVOID)((ULONG_PTR)Buffer + ExtraStart), Size - ExtraStart, 0xFF);
161 
163  else return;
164  }
165 
166  FirstPage = Address >> 12;
167  LastPage = (Address + Size - 1) >> 12;
168 
169  if (FirstPage == LastPage)
170  {
171  ReadPage(PageTable[FirstPage], Address, Buffer, Size);
172  }
173  else
174  {
175  for (i = FirstPage; i <= LastPage; i++)
176  {
177  Offset = (i == FirstPage) ? (Address & (PAGE_SIZE - 1)) : 0;
178  Length = ((i == LastPage) ? (Address + Size - (LastPage << 12)) : PAGE_SIZE) - Offset;
179 
180  ReadPage(PageTable[i], (i << 12) + Offset, Buffer, Length);
182  }
183  }
184 }
_In_ ULONG _In_ ULONG _In_ ULONG Length
Definition: ntddpcm.h:101
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define UNREFERENCED_PARAMETER(P)
Definition: ntbasedef.h:317
IN PVOID IN PVOID IN USHORT IN USHORT Size
Definition: pci.h:361
uint32_t ULONG_PTR
Definition: typedefs.h:65
#define MAX_ADDRESS
static WCHAR Address[46]
Definition: ping.c:68
Definition: bufpool.h:45
void * PVOID
Definition: retypes.h:9
static VOID ReadPage(PMEM_HOOK Hook, ULONG Address, PVOID Buffer, ULONG Size)
Definition: memory.c:118
#define RtlFillMemory(Dest, Length, Fill)
Definition: winternl.h:593
#define PAGE_SIZE
Definition: env_spec_w32.h:49
_In_ ULONG _In_ ULONG Offset
Definition: ntddpcm.h:101
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
unsigned int ULONG
Definition: retypes.h:1
static BOOLEAN A20Line
Definition: memory.c:44

Referenced by CpuInitialize(), DmaRequest(), DosWriteFile(), EmulatorCopyMemory(), PaintMouseCursor(), VidBiosDrawGlyph(), VidBiosVideoService(), and WriteDisk().

◆ EmulatorSetA20()

VOID EmulatorSetA20 ( BOOLEAN  Enabled)

Definition at line 275 of file memory.c.

276 {
277  A20Line = Enabled;
278 }
static BOOLEAN A20Line
Definition: memory.c:44

Referenced by PS2WriteData(), XmsLocalDisableA20(), and XmsLocalEnableA20().

◆ EmulatorWriteMemory()

VOID FASTCALL EmulatorWriteMemory ( PFAST486_STATE  State,
ULONG  Address,
PVOID  Buffer,
ULONG  Size 
)

Definition at line 186 of file memory.c.

187 {
188  ULONG i, Offset, Length;
189  ULONG FirstPage, LastPage;
190 
192 
193  /* If the A20 line is disabled, mask bit 20 */
194  if (!A20Line) Address &= ~(1 << 20);
195 
196  if (Address >= MAX_ADDRESS) return;
198 
199  FirstPage = Address >> 12;
200  LastPage = (Address + Size - 1) >> 12;
201 
202  if (FirstPage == LastPage)
203  {
204  WritePage(PageTable[FirstPage], Address, Buffer, Size);
205  }
206  else
207  {
208  for (i = FirstPage; i <= LastPage; i++)
209  {
210  Offset = (i == FirstPage) ? (Address & (PAGE_SIZE - 1)) : 0;
211  Length = ((i == LastPage) ? (Address + Size - (LastPage << 12)) : PAGE_SIZE) - Offset;
212 
213  WritePage(PageTable[i], (i << 12) + Offset, Buffer, Length);
215  }
216  }
217 }
_In_ ULONG _In_ ULONG _In_ ULONG Length
Definition: ntddpcm.h:101
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define UNREFERENCED_PARAMETER(P)
Definition: ntbasedef.h:317
IN PVOID IN PVOID IN USHORT IN USHORT Size
Definition: pci.h:361
uint32_t ULONG_PTR
Definition: typedefs.h:65
#define MAX_ADDRESS
static WCHAR Address[46]
Definition: ping.c:68
Definition: bufpool.h:45
void * PVOID
Definition: retypes.h:9
static VOID WritePage(PMEM_HOOK Hook, ULONG Address, PVOID Buffer, ULONG Size)
Definition: memory.c:129
#define PAGE_SIZE
Definition: env_spec_w32.h:49
_In_ ULONG _In_ ULONG Offset
Definition: ntddpcm.h:101
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define min(a, b)
Definition: monoChain.cc:55
unsigned int ULONG
Definition: retypes.h:1
static BOOLEAN A20Line
Definition: memory.c:44

Referenced by CpuInitialize(), DmaRequest(), DosReadFile(), EmulatorCopyMemory(), EraseMouseCursor(), PaintMouseCursor(), ReadDisk(), VidBiosClearScreen(), VidBiosDrawGlyph(), and VidBiosScrollWindow().

◆ MemCleanup()

VOID MemCleanup ( VOID  )

Definition at line 783 of file memory.c.

784 {
787  PLIST_ENTRY Pointer;
788 
789  while (!IsListEmpty(&HookList))
790  {
791  Pointer = RemoveHeadList(&HookList);
792  RtlFreeHeap(RtlGetProcessHeap(), 0, CONTAINING_RECORD(Pointer, MEM_HOOK, Entry));
793  }
794 
795  /* Decommit the VDM memory */
797  &BaseAddress,
798  &MemorySize,
799 #ifndef STANDALONE
801 #else
803 #endif
804  );
805  if (!NT_SUCCESS(Status))
806  {
807  DPRINT1("NTVDM: Failed to decommit VDM memory, Status 0x%08lx\n", Status);
808  }
809 }
LONG NTSTATUS
Definition: precomp.h:26
BOOLEAN NTAPI RtlFreeHeap(IN PVOID HeapHandle, IN ULONG Flags, IN PVOID HeapBase)
Definition: heap.c:606
_Must_inspect_result_ FORCEINLINE BOOLEAN IsListEmpty(_In_ const LIST_ENTRY *ListHead)
Definition: rtlfuncs.h:57
#define MAX_ADDRESS
#define MEM_DECOMMIT
Definition: nt_native.h:1315
FORCEINLINE PLIST_ENTRY RemoveHeadList(_Inout_ PLIST_ENTRY ListHead)
Definition: rtlfuncs.h:128
static LIST_ENTRY HookList
Definition: memory.c:42
PFLT_MESSAGE_WAITER_QUEUE CONTAINING_RECORD(Csq, DEVICE_EXTENSION, IrpQueue)) -> WaiterQ.mLock) _IRQL_raises_(DISPATCH_LEVEL) VOID NTAPI FltpAcquireMessageWaiterLock(_In_ PIO_CSQ Csq, _Out_ PKIRQL Irql)
Definition: Messaging.c:560
#define NtCurrentProcess()
Definition: nt_native.h:1657
Status
Definition: gdiplustypes.h:24
_In_ HANDLE _Outptr_result_bytebuffer_ ViewSize PVOID * BaseAddress
Definition: mmfuncs.h:404
#define NT_SUCCESS(StatCode)
Definition: apphelp.c:32
static CONST DWORD MemorySize[]
Definition: svga.c:32
Definition: typedefs.h:119
ULONG_PTR SIZE_T
Definition: typedefs.h:80
#define DPRINT1
Definition: precomp.h:8
#define MEM_RELEASE
Definition: nt_native.h:1316
#define STANDALONE
Definition: testlist.c:1
base of all file and directory entries
Definition: entries.h:82
NTSTATUS NTAPI NtFreeVirtualMemory(IN HANDLE ProcessHandle, IN PVOID *UBaseAddress, IN PSIZE_T URegionSize, IN ULONG FreeType)
Definition: virtual.c:5224

Referenced by EmulatorCleanup().

◆ MemExceptionHandler()

VOID MemExceptionHandler ( ULONG  FaultAddress,
BOOLEAN  Writing 
)

Definition at line 286 of file memory.c.

287 {
288  PMEM_HOOK Hook = PageTable[FaultAddress >> 12];
289  DPRINT("The memory at 0x%08X could not be %s.\n", FaultAddress, Writing ? "written" : "read");
290 
291  /* Exceptions are only supposed to happen when using VDD-style memory hooks */
292  ASSERT(FaultAddress < MAX_ADDRESS && Hook != NULL && Hook->hVdd != NULL);
293 
294  /* Call the VDD handler */
295  Hook->VddHandler(REAL_TO_PHYS(FaultAddress), (ULONG)Writing);
296 }
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define REAL_TO_PHYS(ptr)
Definition: emulator.h:37
#define ASSERT(a)
Definition: mode.c:44
#define NULL
Definition: types.h:112
unsigned int ULONG
Definition: retypes.h:1
#define DPRINT
Definition: sndvol32.h:71
PVDD_MEMORY_HANDLER VddHandler
Definition: memory.c:32
HANDLE hVdd
Definition: testvdd.c:87

Referenced by CpuExceptionFilter().

◆ MemInitialize()

BOOLEAN MemInitialize ( VOID  )

Definition at line 723 of file memory.c.

724 {
726  SIZE_T MemorySize = MAX_ADDRESS; // See: kernel32/client/vdm.c!BaseGetVdmConfigInfo
727 
729 
730 #ifndef STANDALONE
731 
732  /*
733  * The reserved region starts from the very first page.
734  * We need to commit the reserved first 16 MB virtual address.
735  *
736  * NOTE: NULL has another signification for NtAllocateVirtualMemory.
737  */
738  BaseAddress = (PVOID)1;
739 
740  /*
741  * Since to get NULL, we allocated from 0x1, account for this.
742  * See also: kernel32/client/proc.c!CreateProcessInternalW
743  */
744  MemorySize -= 1;
745 
746 #else
747 
748  /* Allocate it anywhere */
749  BaseAddress = NULL;
750 
751 #endif
752 
754  &BaseAddress,
755  0,
756  &MemorySize,
757 #ifndef STANDALONE
758  MEM_COMMIT,
759 #else
761 #endif
763  if (!NT_SUCCESS(Status))
764  {
765  wprintf(L"FATAL: Failed to commit VDM memory, Status 0x%08lx\n", Status);
766  return FALSE;
767  }
768 
769 #ifndef STANDALONE
770  ASSERT(BaseAddress == NULL);
771 #endif
772 
773  /*
774  * For diagnostics purposes, we fill the memory with INT 0x03 codes
775  * so that if a program wants to execute random code in memory, we can
776  * retrieve the exact CS:IP where the problem happens.
777  */
779  return TRUE;
780 }
#define TRUE
Definition: types.h:120
LONG NTSTATUS
Definition: precomp.h:26
#define wprintf(...)
Definition: whoami.c:18
#define MEM_COMMIT
Definition: nt_native.h:1313
#define MAX_ADDRESS
#define L(x)
Definition: ntvdm.h:50
#define FALSE
Definition: types.h:117
#define MEM_RESERVE
Definition: nt_native.h:1314
void * PVOID
Definition: retypes.h:9
static LIST_ENTRY HookList
Definition: memory.c:42
#define NtCurrentProcess()
Definition: nt_native.h:1657
Status
Definition: gdiplustypes.h:24
_In_ HANDLE _Outptr_result_bytebuffer_ ViewSize PVOID * BaseAddress
Definition: mmfuncs.h:404
#define ASSERT(a)
Definition: mode.c:44
#define NT_SUCCESS(StatCode)
Definition: apphelp.c:32
#define RtlFillMemory(Dest, Length, Fill)
Definition: winternl.h:593
static CONST DWORD MemorySize[]
Definition: svga.c:32
ULONG_PTR SIZE_T
Definition: typedefs.h:80
NTSTATUS NTAPI NtAllocateVirtualMemory(IN HANDLE ProcessHandle, IN OUT PVOID *UBaseAddress, IN ULONG_PTR ZeroBits, IN OUT PSIZE_T URegionSize, IN ULONG AllocationType, IN ULONG Protect)
Definition: virtual.c:4486
#define InitializeListHead(ListHead)
Definition: env_spec_w32.h:944
#define NULL
Definition: types.h:112
#define STANDALONE
Definition: testlist.c:1
#define PAGE_EXECUTE_READWRITE
Definition: nt_native.h:1308

Referenced by EmulatorInitialize().

◆ MemInstallFastMemoryHook()

BOOL MemInstallFastMemoryHook ( PVOID  Address,
ULONG  Size,
PMEMORY_READ_HANDLER  ReadHandler,
PMEMORY_WRITE_HANDLER  WriteHandler 
)

Definition at line 299 of file memory.c.

303 {
304  PMEM_HOOK Hook;
305  ULONG i;
306  ULONG FirstPage = (ULONG_PTR)Address >> 12;
307  ULONG LastPage = ((ULONG_PTR)Address + Size - 1) >> 12;
308  PLIST_ENTRY Pointer;
309 
310  /* Make sure none of these pages are already allocated */
311  for (i = FirstPage; i <= LastPage; i++)
312  {
313  if (PageTable[i] != NULL) return FALSE;
314  }
315 
316  for (Pointer = HookList.Flink; Pointer != &HookList; Pointer = Pointer->Flink)
317  {
318  Hook = CONTAINING_RECORD(Pointer, MEM_HOOK, Entry);
319 
320  if (Hook->hVdd == NULL
321  && Hook->FastReadHandler == ReadHandler
322  && Hook->FastWriteHandler == WriteHandler)
323  {
324  break;
325  }
326  }
327 
328  if (Pointer == &HookList)
329  {
330  /* Create and initialize a new hook entry... */
331  Hook = RtlAllocateHeap(RtlGetProcessHeap(), 0, sizeof(*Hook));
332  if (Hook == NULL) return FALSE;
333 
334  Hook->hVdd = NULL;
335  Hook->Count = 0;
336  Hook->FastReadHandler = ReadHandler;
337  Hook->FastWriteHandler = WriteHandler;
338 
339  /* ... and add it to the list of hooks */
340  InsertTailList(&HookList, &Hook->Entry);
341  }
342 
343  /* Increase the number of pages this hook has */
344  Hook->Count += LastPage - FirstPage + 1;
345 
346  /* Add the hook entry to the page table */
347  for (i = FirstPage; i <= LastPage; i++) PageTable[i] = Hook;
348 
349  return TRUE;
350 }
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define TRUE
Definition: types.h:120
ULONG Count
Definition: memory.c:28
LIST_ENTRY Entry
Definition: memory.c:26
IN PVOID IN PVOID IN USHORT IN USHORT Size
Definition: pci.h:361
#define InsertTailList(ListHead, Entry)
#define FALSE
Definition: types.h:117
static WCHAR Address[46]
Definition: ping.c:68
static LIST_ENTRY HookList
Definition: memory.c:42
PFLT_MESSAGE_WAITER_QUEUE CONTAINING_RECORD(Csq, DEVICE_EXTENSION, IrpQueue)) -> WaiterQ.mLock) _IRQL_raises_(DISPATCH_LEVEL) VOID NTAPI FltpAcquireMessageWaiterLock(_In_ PIO_CSQ Csq, _Out_ PKIRQL Irql)
Definition: Messaging.c:560
PVOID NTAPI RtlAllocateHeap(IN PVOID HeapHandle, IN ULONG Flags, IN SIZE_T Size)
Definition: heap.c:588
HANDLE hVdd
Definition: memory.c:27
struct _LIST_ENTRY * Flink
Definition: typedefs.h:121
Definition: typedefs.h:119
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define NULL
Definition: types.h:112
PMEMORY_READ_HANDLER FastReadHandler
Definition: memory.c:36
unsigned int ULONG
Definition: retypes.h:1
#define ULONG_PTR
Definition: config.h:101
PMEMORY_WRITE_HANDLER FastWriteHandler
Definition: memory.c:37
base of all file and directory entries
Definition: entries.h:82

Referenced by EmsDrvInitialize(), VgaWriteGc(), VgaWritePort(), and WriteProtectRom().

◆ MemQueryMemoryZone()

BOOLEAN MemQueryMemoryZone ( ULONG  StartAddress,
PULONG  Length,
PBOOLEAN  Hooked 
)

Definition at line 381 of file memory.c.

382 {
383  ULONG Page = StartAddress >> 12;
384  if (Page >= TOTAL_PAGES) return FALSE;
385 
386  *Length = 0;
387  *Hooked = PageTable[Page] != NULL;
388 
389  while (Page < TOTAL_PAGES && (PageTable[Page] != NULL) == *Hooked)
390  {
391  *Length += PAGE_SIZE;
392  Page++;
393  }
394 
395  return TRUE;
396 }
_In_ ULONG _In_ ULONG _In_ ULONG Length
Definition: ntddpcm.h:101
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define TRUE
Definition: types.h:120
_In_ PVOID _Out_opt_ BOOLEAN _Out_opt_ PPFN_NUMBER Page
Definition: mm.h:1295
#define FALSE
Definition: types.h:117
#define PAGE_SIZE
Definition: env_spec_w32.h:49
#define TOTAL_PAGES
Definition: memory.h:14
#define NULL
Definition: types.h:112
unsigned int ULONG
Definition: retypes.h:1

Referenced by BiosMiscService().

◆ MemRemoveFastMemoryHook()

BOOL MemRemoveFastMemoryHook ( PVOID  Address,
ULONG  Size 
)

Definition at line 353 of file memory.c.

354 {
355  PMEM_HOOK Hook;
356  ULONG i;
357  ULONG FirstPage = (ULONG_PTR)Address >> 12;
358  ULONG LastPage = ((ULONG_PTR)Address + Size - 1) >> 12;
359 
360  if (Size == 0) return FALSE;
361 
362  for (i = FirstPage; i <= LastPage; i++)
363  {
364  Hook = PageTable[i];
365  if (Hook == NULL || Hook->hVdd != NULL) continue;
366 
367  if (--Hook->Count == 0)
368  {
369  /* This hook has no more pages */
370  RemoveEntryList(&Hook->Entry);
371  RtlFreeHeap(RtlGetProcessHeap(), 0, Hook);
372  }
373 
374  PageTable[i] = NULL;
375  }
376 
377  return TRUE;
378 }
static PMEM_HOOK PageTable[TOTAL_PAGES]
Definition: memory.c:43
#define TRUE
Definition: types.h:120
ULONG Count
Definition: memory.c:28
BOOLEAN NTAPI RtlFreeHeap(IN PVOID HeapHandle, IN ULONG Flags, IN PVOID HeapBase)
Definition: heap.c:606
LIST_ENTRY Entry
Definition: memory.c:26
IN PVOID IN PVOID IN USHORT IN USHORT Size
Definition: pci.h:361
FORCEINLINE BOOLEAN RemoveEntryList(_In_ PLIST_ENTRY Entry)
Definition: rtlfuncs.h:105
#define FALSE
Definition: types.h:117
static WCHAR Address[46]
Definition: ping.c:68
HANDLE hVdd
Definition: memory.c:27
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define NULL
Definition: types.h:112
unsigned int ULONG
Definition: retypes.h:1
#define ULONG_PTR
Definition: config.h:101

Referenced by EmsDrvCleanup(), VgaCleanup(), VgaWriteGc(), VgaWritePort(), and WriteUnProtectRom().