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/*
* Copyright 2007 Nouveau Project
*
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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 <stdlib.h>
#include <errno.h>
#include "nouveau_heap.h"
int
nouveau_heap_init(struct nouveau_heap **heap,
unsigned start, unsigned size)
{
struct nouveau_heap *r;
r = calloc(1, sizeof(struct nouveau_heap));
if (!r)
return 1;
r->start = start;
r->size = size;
*heap = r;
return 0;
}
void
nouveau_heap_destroy(struct nouveau_heap **heap)
{
struct nouveau_heap *current = *heap;
while (current) {
struct nouveau_heap *const next = current->next;
free(current);
current = next;
}
*heap = NULL;
}
int
nouveau_heap_alloc(struct nouveau_heap *heap, unsigned size, void *priv,
struct nouveau_heap **res)
{
struct nouveau_heap *r;
if (!heap || !size || !res || *res)
return 1;
while (heap) {
if (!heap->in_use && heap->size >= size) {
r = calloc(1, sizeof(struct nouveau_heap));
if (!r)
return 1;
r->start = (heap->start + heap->size) - size;
r->size = size;
r->in_use = 1;
r->priv = priv;
heap->size -= size;
r->next = heap->next;
if (heap->next)
heap->next->prev = r;
r->prev = heap;
heap->next = r;
*res = r;
return 0;
}
heap = heap->next;
}
return 1;
}
void
nouveau_heap_free(struct nouveau_heap **res)
{
struct nouveau_heap *r;
if (!res || !*res)
return;
r = *res;
*res = NULL;
r->in_use = 0;
if (r->next && !r->next->in_use) {
struct nouveau_heap *new = r->next;
new->prev = r->prev;
if (r->prev)
r->prev->next = new;
new->size += r->size;
new->start = r->start;
free(r);
r = new;
}
if (r->prev && !r->prev->in_use) {
r->prev->next = r->next;
if (r->next)
r->next->prev = r->prev;
r->prev->size += r->size;
free(r);
}
}
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