116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
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/*
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* Copyright 2007 Nouveau Project
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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 in
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* 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 OR
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* 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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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include "nouveau_private.h"
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int
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nouveau_resource_init(struct nouveau_resource **heap,
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unsigned start, unsigned size)
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{
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struct nouveau_resource *r;
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r = calloc(1, sizeof(struct nouveau_resource));
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if (!r)
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return 1;
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r->start = start;
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r->size = size;
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*heap = r;
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return 0;
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}
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int
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nouveau_resource_alloc(struct nouveau_resource *heap, int size, void *priv,
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struct nouveau_resource **res)
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{
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struct nouveau_resource *r;
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if (!heap || !size || !res || *res)
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return 1;
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while (heap) {
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if (!heap->in_use && heap->size >= size) {
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r = calloc(1, sizeof(struct nouveau_resource));
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if (!r)
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return 1;
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r->start = (heap->start + heap->size) - size;
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r->size = size;
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r->in_use = 1;
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r->priv = priv;
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heap->size -= size;
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r->next = heap->next;
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if (heap->next)
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heap->next->prev = r;
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r->prev = heap;
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heap->next = r;
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*res = r;
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return 0;
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}
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heap = heap->next;
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}
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return 1;
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}
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void
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nouveau_resource_free(struct nouveau_resource **res)
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{
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struct nouveau_resource *r;
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if (!res || !*res)
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return;
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r = *res;
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*res = NULL;
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r->in_use = 0;
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if (r->next && !r->next->in_use) {
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struct nouveau_resource *new = r->next;
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new->prev = r->prev;
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if (r->prev)
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r->prev->next = new;
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new->size += r->size;
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new->start = r->start;
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free(r);
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r = new;
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}
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if (r->prev && !r->prev->in_use) {
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r->prev->next = r->next;
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if (r->next)
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r->next->prev = r->prev;
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r->prev->size += r->size;
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free(r);
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}
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}
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