patch-2.2.18 linux/drivers/char/drm/ctxbitmap.c

• Lines: 86
• Date: Fri Sep 1 14:12:32 2000
• Orig file: v2.2.17/drivers/char/drm/ctxbitmap.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/char/drm/ctxbitmap.c linux/drivers/char/drm/ctxbitmap.c
@@ -0,0 +1,85 @@
+/* ctxbitmap.c -- Context bitmap management -*- linux-c -*-
+ * Created: Thu Jan 6 03:56:42 2000 by jhartmann@precisioninsight.com
+ * 
+ * Copyright 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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.
+ *
+ * Author: Jeff Hartmann <jhartmann@valinux.com>
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+void drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle)
+{
+	if (ctx_handle < 0) goto failed;
+
+	if (ctx_handle < DRM_MAX_CTXBITMAP) {
+		clear_bit(ctx_handle, dev->ctx_bitmap);
+		return;
+	}
+failed:
+       	DRM_ERROR("Attempt to free invalid context handle: %d\n",
+		  ctx_handle);
+       	return;
+}
+
+int drm_ctxbitmap_next(drm_device_t *dev)
+{
+	int bit;
+
+	bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP);
+	if (bit < DRM_MAX_CTXBITMAP) {
+		set_bit(bit, dev->ctx_bitmap);
+	   	DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit);
+		return bit;
+	}
+	return -1;
+}
+
+int drm_ctxbitmap_init(drm_device_t *dev)
+{
+	int i;
+   	int temp;
+
+	dev->ctx_bitmap = (unsigned long *) drm_alloc(PAGE_SIZE, 
+						      DRM_MEM_CTXBITMAP);
+	if(dev->ctx_bitmap == NULL) {
+		return -ENOMEM;
+	}
+	memset((void *) dev->ctx_bitmap, 0, PAGE_SIZE);
+	for(i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+		temp = drm_ctxbitmap_next(dev);
+	   	DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp);
+	}
+
+	return 0;
+}
+
+void drm_ctxbitmap_cleanup(drm_device_t *dev)
+{
+	drm_free((void *)dev->ctx_bitmap, PAGE_SIZE,
+		 DRM_MEM_CTXBITMAP);
+}
+