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Diffstat (limited to 'drivers/char/drm/ctxbitmap.c')
-rw-r--r--drivers/char/drm/ctxbitmap.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/char/drm/ctxbitmap.c b/drivers/char/drm/ctxbitmap.c
new file mode 100644
index 000000000..615505979
--- /dev/null
+++ b/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);
+}
+