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ntoskrnl.exe: Implement IoAllocateMdl.

This commit is contained in:
Christian Costa 2012-10-02 00:09:51 +02:00 committed by Alexandre Julliard
parent ce44d1e506
commit 5c65471681
1 changed files with 23 additions and 2 deletions
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25
dlls/ntoskrnl.exe/ntoskrnl.c
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@ -415,13 +415,34 @@ PVOID WINAPI IoAllocateErrorLogEntry( PVOID IoObject, UCHAR EntrySize )
PMDL WINAPI IoAllocateMdl( PVOID VirtualAddress, ULONG Length, BOOLEAN SecondaryBuffer, BOOLEAN ChargeQuota, PIRP Irp ) PMDL WINAPI IoAllocateMdl( PVOID VirtualAddress, ULONG Length, BOOLEAN SecondaryBuffer, BOOLEAN ChargeQuota, PIRP Irp )
{ {
PMDL mdl; PMDL mdl;
ULONG_PTR address = (ULONG_PTR)VirtualAddress;
ULONG_PTR page_address;
SIZE_T nb_pages, mdl_size;
FIXME("partial stub: %p, %u, %i, %i, %p\n", VirtualAddress, Length, SecondaryBuffer, ChargeQuota, Irp); TRACE("(%p, %u, %i, %i, %p)\n", VirtualAddress, Length, SecondaryBuffer, ChargeQuota, Irp);
mdl = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(MDL)); if (Irp)
FIXME("Attaching the MDL to an IRP is not yet supported\n");
if (ChargeQuota)
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);
if (!mdl) if (!mdl)
return NULL; return NULL;
mdl->Size = mdl_size;
mdl->Process = IoGetCurrentProcess();
mdl->StartVa = (PVOID)page_address;
mdl->ByteCount = Length;
mdl->ByteOffset = address - page_address;
return mdl; return mdl;
} }