Blame intel/mm.c

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/*
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 * GLX Hardware Device Driver common code
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 * Copyright (C) 1999 Wittawat Yamwong
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, 
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
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 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 */
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#include <stdlib.h>
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#include <assert.h>
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#include "xf86drm.h"
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#include "libdrm_macros.h"
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#include "mm.h"
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drm_private void mmDumpMemInfo(const struct mem_block *heap)
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{
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	drmMsg("Memory heap %p:\n", (void *)heap);
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	if (heap == 0) {
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		drmMsg("  heap == 0\n");
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	} else {
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		const struct mem_block *p;
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		for (p = heap->next; p != heap; p = p->next) {
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			drmMsg("  Offset:%08x, Size:%08x, %c%c\n", p->ofs,
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			       p->size, p->free ? 'F' : '.',
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			       p->reserved ? 'R' : '.');
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		}
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		drmMsg("\nFree list:\n");
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		for (p = heap->next_free; p != heap; p = p->next_free) {
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			drmMsg(" FREE Offset:%08x, Size:%08x, %c%c\n", p->ofs,
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			       p->size, p->free ? 'F' : '.',
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			       p->reserved ? 'R' : '.');
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		}
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	}
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	drmMsg("End of memory blocks\n");
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}
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drm_private struct mem_block *mmInit(int ofs, int size)
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{
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	struct mem_block *heap, *block;
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	if (size <= 0)
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		return NULL;
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	heap = (struct mem_block *)calloc(1, sizeof(struct mem_block));
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	if (!heap)
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		return NULL;
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	block = (struct mem_block *)calloc(1, sizeof(struct mem_block));
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	if (!block) {
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		free(heap);
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		return NULL;
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	}
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	heap->next = block;
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	heap->prev = block;
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	heap->next_free = block;
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	heap->prev_free = block;
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	block->heap = heap;
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	block->next = heap;
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	block->prev = heap;
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	block->next_free = heap;
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	block->prev_free = heap;
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	block->ofs = ofs;
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	block->size = size;
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	block->free = 1;
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	return heap;
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}
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static struct mem_block *SliceBlock(struct mem_block *p,
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				    int startofs, int size,
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				    int reserved, int alignment)
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{
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	struct mem_block *newblock;
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	/* break left  [p, newblock, p->next], then p = newblock */
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	if (startofs > p->ofs) {
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		newblock =
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		    (struct mem_block *)calloc(1, sizeof(struct mem_block));
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		if (!newblock)
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			return NULL;
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		newblock->ofs = startofs;
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		newblock->size = p->size - (startofs - p->ofs);
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		newblock->free = 1;
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		newblock->heap = p->heap;
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		newblock->next = p->next;
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		newblock->prev = p;
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		p->next->prev = newblock;
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		p->next = newblock;
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		newblock->next_free = p->next_free;
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		newblock->prev_free = p;
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		p->next_free->prev_free = newblock;
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		p->next_free = newblock;
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		p->size -= newblock->size;
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		p = newblock;
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	}
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	/* break right, also [p, newblock, p->next] */
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	if (size < p->size) {
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		newblock =
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		    (struct mem_block *)calloc(1, sizeof(struct mem_block));
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		if (!newblock)
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			return NULL;
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		newblock->ofs = startofs + size;
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		newblock->size = p->size - size;
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		newblock->free = 1;
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		newblock->heap = p->heap;
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		newblock->next = p->next;
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		newblock->prev = p;
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		p->next->prev = newblock;
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		p->next = newblock;
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		newblock->next_free = p->next_free;
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		newblock->prev_free = p;
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		p->next_free->prev_free = newblock;
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		p->next_free = newblock;
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		p->size = size;
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	}
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	/* p = middle block */
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	p->free = 0;
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	/* Remove p from the free list: 
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	 */
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	p->next_free->prev_free = p->prev_free;
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	p->prev_free->next_free = p->next_free;
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	p->next_free = 0;
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	p->prev_free = 0;
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	p->reserved = reserved;
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	return p;
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}
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drm_private struct mem_block *mmAllocMem(struct mem_block *heap, int size,
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					 int align2, int startSearch)
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{
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	struct mem_block *p;
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	const int mask = (1 << align2) - 1;
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	int startofs = 0;
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	int endofs;
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	if (!heap || align2 < 0 || size <= 0)
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		return NULL;
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	for (p = heap->next_free; p != heap; p = p->next_free) {
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		assert(p->free);
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		startofs = (p->ofs + mask) & ~mask;
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		if (startofs < startSearch) {
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			startofs = startSearch;
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		}
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		endofs = startofs + size;
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		if (endofs <= (p->ofs + p->size))
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			break;
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	}
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	if (p == heap)
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		return NULL;
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	assert(p->free);
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	p = SliceBlock(p, startofs, size, 0, mask + 1);
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	return p;
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}
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static int Join2Blocks(struct mem_block *p)
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{
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	/* XXX there should be some assertions here */
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	/* NOTE: heap->free == 0 */
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	if (p->free && p->next->free) {
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		struct mem_block *q = p->next;
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		assert(p->ofs + p->size == q->ofs);
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		p->size += q->size;
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		p->next = q->next;
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		q->next->prev = p;
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		q->next_free->prev_free = q->prev_free;
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		q->prev_free->next_free = q->next_free;
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		free(q);
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		return 1;
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	}
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	return 0;
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}
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drm_private int mmFreeMem(struct mem_block *b)
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{
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	if (!b)
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		return 0;
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	if (b->free) {
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		drmMsg("block already free\n");
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		return -1;
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	}
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	if (b->reserved) {
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		drmMsg("block is reserved\n");
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		return -1;
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	}
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	b->free = 1;
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	b->next_free = b->heap->next_free;
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	b->prev_free = b->heap;
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	b->next_free->prev_free = b;
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	b->prev_free->next_free = b;
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	Join2Blocks(b);
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	if (b->prev != b->heap)
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		Join2Blocks(b->prev);
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	return 0;
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}
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drm_private void mmDestroy(struct mem_block *heap)
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{
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	struct mem_block *p;
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	if (!heap)
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		return;
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	for (p = heap->next; p != heap;) {
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		struct mem_block *next = p->next;
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		free(p);
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		p = next;
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	}
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	free(heap);
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}