-/**************************************************************************
- *
- * Copyright (C) 1999 Wittawat Yamwong
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * WITTAWAT YAMWONG, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
- * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
-
-
-#include "pipe/p_compiler.h"
-#include "util/u_debug.h"
-
-#include "util/u_memory.h"
-#include "util/u_mm.h"
-
-
-void
-u_mmDumpMemInfo(const struct mem_block *heap)
-{
- debug_printf("Memory heap %p:\n", (void *) heap);
- if (heap == NULL) {
- debug_printf(" heap == 0\n");
- }
- else {
- const struct mem_block *p;
- int total_used = 0, total_free = 0;
-
- for (p = heap->next; p != heap; p = p->next) {
- debug_printf(" Offset:%08x, Size:%08x, %c%c\n", p->ofs, p->size,
- p->free ? 'F':'.',
- p->reserved ? 'R':'.');
- if (p->free)
- total_free += p->size;
- else
- total_used += p->size;
- }
-
- debug_printf("'\nMemory stats: total = %d, used = %d, free = %d\n",
- total_used + total_free, total_used, total_free);
- debug_printf("\nFree list:\n");
-
- for (p = heap->next_free; p != heap; p = p->next_free) {
- debug_printf(" FREE Offset:%08x, Size:%08x, %c%c\n", p->ofs, p->size,
- p->free ? 'F':'.',
- p->reserved ? 'R':'.');
- }
-
- }
- debug_printf("End of memory blocks\n");
-}
-
-
-struct mem_block *
-u_mmInit(int ofs, int size)
-{
- struct mem_block *heap, *block;
-
- if (size <= 0)
- return NULL;
-
- heap = CALLOC_STRUCT(mem_block);
- if (!heap)
- return NULL;
-
- block = CALLOC_STRUCT(mem_block);
- if (!block) {
- FREE(heap);
- return NULL;
- }
-
- heap->next = block;
- heap->prev = block;
- heap->next_free = block;
- heap->prev_free = block;
-
- block->heap = heap;
- block->next = heap;
- block->prev = heap;
- block->next_free = heap;
- block->prev_free = heap;
-
- block->ofs = ofs;
- block->size = size;
- block->free = 1;
-
- return heap;
-}
-
-
-static struct mem_block *
-SliceBlock(struct mem_block *p,
- int startofs, int size,
- int reserved, UNUSED int alignment)
-{
- struct mem_block *newblock;
-
- /* break left [p, newblock, p->next], then p = newblock */
- if (startofs > p->ofs) {
- newblock = CALLOC_STRUCT(mem_block);
- if (!newblock)
- return NULL;
- newblock->ofs = startofs;
- newblock->size = p->size - (startofs - p->ofs);
- newblock->free = 1;
- newblock->heap = p->heap;
-
- newblock->next = p->next;
- newblock->prev = p;
- p->next->prev = newblock;
- p->next = newblock;
-
- newblock->next_free = p->next_free;
- newblock->prev_free = p;
- p->next_free->prev_free = newblock;
- p->next_free = newblock;
-
- p->size -= newblock->size;
- p = newblock;
- }
-
- /* break right, also [p, newblock, p->next] */
- if (size < p->size) {
- newblock = CALLOC_STRUCT(mem_block);
- if (!newblock)
- return NULL;
- newblock->ofs = startofs + size;
- newblock->size = p->size - size;
- newblock->free = 1;
- newblock->heap = p->heap;
-
- newblock->next = p->next;
- newblock->prev = p;
- p->next->prev = newblock;
- p->next = newblock;
-
- newblock->next_free = p->next_free;
- newblock->prev_free = p;
- p->next_free->prev_free = newblock;
- p->next_free = newblock;
-
- p->size = size;
- }
-
- /* p = middle block */
- p->free = 0;
-
- /* Remove p from the free list:
- */
- p->next_free->prev_free = p->prev_free;
- p->prev_free->next_free = p->next_free;
-
- p->next_free = 0;
- p->prev_free = 0;
-
- p->reserved = reserved;
- return p;
-}
-
-
-struct mem_block *
-u_mmAllocMem(struct mem_block *heap, int size, int align2, int startSearch)
-{
- struct mem_block *p;
- const int mask = (1 << align2)-1;
- int startofs = 0;
- int endofs;
-
- assert(size >= 0);
- assert(align2 >= 0);
- /* Make sure that a byte alignment isn't getting passed for our
- * power-of-two alignment arg.
- */
- assert(align2 < 32);
-
- if (!heap || align2 < 0 || size <= 0)
- return NULL;
-
- for (p = heap->next_free; p != heap; p = p->next_free) {
- assert(p->free);
-
- startofs = (p->ofs + mask) & ~mask;
- if ( startofs < startSearch ) {
- startofs = startSearch;
- }
- endofs = startofs+size;
- if (endofs <= (p->ofs+p->size))
- break;
- }
-
- if (p == heap)
- return NULL;
-
- assert(p->free);
- p = SliceBlock(p,startofs,size,0,mask+1);
-
- return p;
-}
-
-
-struct mem_block *
-u_mmFindBlock(struct mem_block *heap, int start)
-{
- struct mem_block *p;
-
- for (p = heap->next; p != heap; p = p->next) {
- if (p->ofs == start)
- return p;
- }
-
- return NULL;
-}
-
-
-static inline int
-Join2Blocks(struct mem_block *p)
-{
- /* XXX there should be some assertions here */
-
- /* NOTE: heap->free == 0 */
-
- if (p->free && p->next->free) {
- struct mem_block *q = p->next;
-
- assert(p->ofs + p->size == q->ofs);
- p->size += q->size;
-
- p->next = q->next;
- q->next->prev = p;
-
- q->next_free->prev_free = q->prev_free;
- q->prev_free->next_free = q->next_free;
-
- FREE(q);
- return 1;
- }
- return 0;
-}
-
-int
-u_mmFreeMem(struct mem_block *b)
-{
- if (!b)
- return 0;
-
- if (b->free) {
- debug_printf("block already free\n");
- return -1;
- }
- if (b->reserved) {
- debug_printf("block is reserved\n");
- return -1;
- }
-
- b->free = 1;
- b->next_free = b->heap->next_free;
- b->prev_free = b->heap;
- b->next_free->prev_free = b;
- b->prev_free->next_free = b;
-
- Join2Blocks(b);
- if (b->prev != b->heap)
- Join2Blocks(b->prev);
-
- return 0;
-}
-
-
-void
-u_mmDestroy(struct mem_block *heap)
-{
- struct mem_block *p;
-
- if (!heap)
- return;
-
- for (p = heap->next; p != heap; ) {
- struct mem_block *next = p->next;
- FREE(p);
- p = next;
- }
-
- FREE(heap);
-}
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