1 files changed, 116 insertions, 0 deletions
diff --git a/src/gallium/winsys/drm/nouveau/common/nouveau_resource.c b/src/gallium/winsys/drm/nouveau/common/nouveau_resource.c
new file mode 100644
index 00000000000..766fd279fe0
--- /dev/null
+++ b/src/gallium/winsys/drm/nouveau/common/nouveau_resource.c
@@ -0,0 +1,116 @@
+/*
+ * 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 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 <util/u_memory.h>
+#include "nouveau_drmif.h"
+#include "nouveau_local.h"
+
+int
+nouveau_resource_init(struct nouveau_resource **heap,
+		      unsigned start, unsigned size)
+{
+	struct nouveau_resource *r;
+
+	r = CALLOC_STRUCT(nouveau_resource);
+	if (!r)
+		return 1;
+
+	r->start = start;
+	r->size  = size;
+	*heap = r;
+	return 0;
+}
+
+int
+nouveau_resource_alloc(struct nouveau_resource *heap, int size, void *priv,
+		       struct nouveau_resource **res)
+{
+	struct nouveau_resource *r;
+
+	if (!heap || !size || !res || *res)
+		return 1;
+
+	while (heap) {
+		if (!heap->in_use && heap->size >= size) {
+			r = CALLOC_STRUCT(nouveau_resource);
+			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_resource_free(struct nouveau_resource **res)
+{
+	struct nouveau_resource *r;
+
+	if (!res || !*res)
+		return;
+	r = *res;
+	*res = NULL;
+
+	r->in_use = 0;
+
+	if (r->next && !r->next->in_use) {
+		struct nouveau_resource *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);
+	}
+
+}