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ntoskrnl.exe: Use MmInitializeMdl in IoAllocateMdl. 

Signed-off-by: Sebastian Lackner <sebastian@fds-team.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Sebastian Lackner 2016-10-16 08:53:29 +02:00 committed by Alexandre Julliard
parent eb7ac554d1
commit 9912ef778f
2 changed files with 25 additions and 15 deletions
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19
dlls/ntoskrnl.exe/ntoskrnl.c
View File

@ -744,31 +744,20 @@ PVOID WINAPI IoAllocateErrorLogEntry( PVOID IoObject, UCHAR EntrySize )
*/
PMDL WINAPI IoAllocateMdl( PVOID va, ULONG length, BOOLEAN secondary, BOOLEAN charge_quota, IRP *irp )
{
SIZE_T mdl_size;
PMDL mdl;
ULONG_PTR address = (ULONG_PTR)va;
ULONG_PTR page_address;
SIZE_T nb_pages, mdl_size;
TRACE("(%p, %u, %i, %i, %p)\n", va, length, secondary, charge_quota, irp);
if (charge_quota)
FIXME("Charge quota is not yet supported\n");
/* FIXME: We suppose that page size is 4096 */
page_address = address & ~(4096 - 1);
nb_pages = (((address + length - 1) & ~(4096 - 1)) - page_address) / 4096 + 1;
mdl_size = sizeof(MDL) + nb_pages * sizeof(PVOID);
mdl = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, mdl_size);
mdl_size = sizeof(MDL) + sizeof(PFN_NUMBER) * ADDRESS_AND_SIZE_TO_SPAN_PAGES(va, length);
mdl = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, mdl_size );
if (!mdl)
return NULL;
mdl->Size = mdl_size;
mdl->Process = NULL; /* FIXME: IoGetCurrentProcess */
mdl->StartVa = (PVOID)page_address;
mdl->ByteCount = length;
mdl->ByteOffset = address - page_address;
MmInitializeMdl( mdl, va, length );
if (!irp) return mdl;

21
include/ddk/wdm.h
View File

@ -28,6 +28,16 @@
#define POINTER_ALIGNMENT
#endif
/* FIXME: We suppose that page size is 4096 */
#undef PAGE_SIZE
#define PAGE_SIZE 0x1000
#define PAGE_SHIFT 12
#define BYTE_OFFSET(va) ((ULONG)((ULONG_PTR)(va) & (PAGE_SIZE - 1)))
#define PAGE_ALIGN(va) ((PVOID)((ULONG_PTR)(va) & ~(PAGE_SIZE - 1)))
#define ADDRESS_AND_SIZE_TO_SPAN_PAGES(va, length) \
((BYTE_OFFSET(va) + ((SIZE_T)(length)) + (PAGE_SIZE - 1)) >> PAGE_SHIFT)
typedef LONG KPRIORITY;
typedef ULONG_PTR KSPIN_LOCK, *PKSPIN_LOCK;
@ -1035,6 +1045,17 @@ typedef struct _MDL {
} MDL, *PMDL;
typedef MDL *PMDLX;
typedef ULONG PFN_NUMBER, *PPFN_NUMBER;
static inline void MmInitializeMdl(MDL *mdl, void *va, SIZE_T length)
{
mdl->Next = NULL;
mdl->Size = sizeof(MDL) + sizeof(PFN_NUMBER) * ADDRESS_AND_SIZE_TO_SPAN_PAGES(va, length);
mdl->MdlFlags = 0;
mdl->StartVa = (void *)PAGE_ALIGN(va);
mdl->ByteOffset = BYTE_OFFSET(va);
mdl->ByteCount = length;
}
typedef struct _KTIMER {
DISPATCHER_HEADER Header;