mirror of
https://github.com/reactos/reactos.git
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157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/ex/zone.c
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* PURPOSE: Implements zone buffers
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* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
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* David Welch (welch@mcmail.com)
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*/
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/* INCLUDES ****************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ***************************************************************/
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/*
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* @implemented
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*/
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NTSTATUS
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NTAPI
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ExExtendZone(PZONE_HEADER Zone,
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PVOID Segment,
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ULONG SegmentSize)
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{
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ULONG_PTR Entry;
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ULONG i;
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/*
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* BlockSize and Segment must be 8-byte aligned.
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* Blocksize cannot exceed Segment Size.
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*/
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if (((ULONG_PTR)Segment & 7) ||
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(SegmentSize & 7) ||
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(Zone->BlockSize > SegmentSize))
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{
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DPRINT1("Invalid ExExtendZone Alignment and/or Size\n");
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return STATUS_INVALID_PARAMETER;
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}
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/* Link the Zone and Segment */
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PushEntryList(&Zone->SegmentList,
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&((PZONE_SEGMENT_HEADER)Segment)->SegmentList);
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/* Get to the first entry */
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Entry = (ULONG_PTR)Segment + sizeof(ZONE_SEGMENT_HEADER);
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/* Loop through the segments */
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for (i = sizeof(ZONE_SEGMENT_HEADER);
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i <= SegmentSize - Zone->BlockSize;
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i+= Zone->BlockSize)
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{
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/* Link the Free and Segment Lists */
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PushEntryList(&Zone->FreeList, (PSINGLE_LIST_ENTRY)Entry);
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/* Go to the next entry */
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Entry += Zone->BlockSize;
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}
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/* Update Segment Size */
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Zone->TotalSegmentSize += i;
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/* Return Success */
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return STATUS_SUCCESS;
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}
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/*
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* @implemented
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*/
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NTSTATUS
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NTAPI
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ExInterlockedExtendZone(PZONE_HEADER Zone,
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PVOID Segment,
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ULONG SegmentSize,
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PKSPIN_LOCK Lock)
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{
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NTSTATUS Status;
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KIRQL OldIrql;
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/* Get the lock */
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KeAcquireSpinLock(Lock, &OldIrql);
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/* Extend the Zone */
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Status = ExExtendZone(Zone, Segment, SegmentSize);
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/* Release lock and return status */
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KeReleaseSpinLock(Lock, OldIrql);
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return Status;
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}
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/*
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* FUNCTION: Initalizes a zone header
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* ARGUMENTS:
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* Zone = zone header to be initialized
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* BlockSize = Size (in bytes) of the allocation size of the zone
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* InitialSegment = Initial segment of storage allocated by the
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* caller
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* InitialSegmentSize = Initial size of the segment
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*
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* @implemented
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*/
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NTSTATUS
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NTAPI
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ExInitializeZone(PZONE_HEADER Zone,
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ULONG BlockSize,
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PVOID InitialSegment,
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ULONG InitialSegmentSize)
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{
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ULONG i;
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ULONG_PTR Entry;
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/*
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* BlockSize and Segment must be 8-byte aligned.
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* Blocksize cannot exceed Segment Size.
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*/
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if (((ULONG_PTR)InitialSegment & 7) ||
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(InitialSegmentSize & 7) ||
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(BlockSize > InitialSegmentSize))
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{
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DPRINT1("Invalid ExInitializeZone Alignment and/or Size\n");
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return STATUS_INVALID_PARAMETER;
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}
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/* Set the Zone Header */
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Zone->BlockSize = BlockSize;
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/* Link empty list */
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Zone->FreeList.Next = NULL;
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Zone->SegmentList.Next = NULL;
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PushEntryList(&Zone->SegmentList,
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&((PZONE_SEGMENT_HEADER)InitialSegment)->SegmentList);
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((PZONE_SEGMENT_HEADER)InitialSegment)->Reserved = NULL;
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/* Get first entry */
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Entry = (ULONG_PTR)InitialSegment + sizeof(ZONE_SEGMENT_HEADER);
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/* Loop through the segments */
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for (i = sizeof(ZONE_SEGMENT_HEADER);
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i <= InitialSegmentSize - BlockSize;
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i+= BlockSize)
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{
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/* Link the Free and Segment Lists */
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PushEntryList(&Zone->FreeList, (PSINGLE_LIST_ENTRY)Entry);
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/* Go to the next entry */
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Entry += Zone->BlockSize;
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}
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/* Update Segment Size */
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Zone->TotalSegmentSize += i;
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/* Return success */
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return STATUS_SUCCESS;
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}
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/* EOF */
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