1 /* ctxbitmap.c -- Context bitmap management -*- linux-c -*-
2 * Created: Thu Jan 6 03:56:42 2000 by jhartmann@precisioninsight.com
3 *
4 * Copyright 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 *
27 * Author: Jeff Hartmann <jhartmann@valinux.com>
28 *
29 */
30
31 #define __NO_VERSION__
32 #include "drmP.h"
33
drm_ctxbitmap_free(drm_device_t * dev,int ctx_handle)34 void drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle)
35 {
36 if (ctx_handle < 0) goto failed;
37
38 if (ctx_handle < DRM_MAX_CTXBITMAP) {
39 clear_bit(ctx_handle, dev->ctx_bitmap);
40 return;
41 }
42 failed:
43 DRM_ERROR("Attempt to free invalid context handle: %d\n",
44 ctx_handle);
45 return;
46 }
47
drm_ctxbitmap_next(drm_device_t * dev)48 int drm_ctxbitmap_next(drm_device_t *dev)
49 {
50 int bit;
51
52 bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP);
53 if (bit < DRM_MAX_CTXBITMAP) {
54 set_bit(bit, dev->ctx_bitmap);
55 DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit);
56 return bit;
57 }
58 return -1;
59 }
60
drm_ctxbitmap_init(drm_device_t * dev)61 int drm_ctxbitmap_init(drm_device_t *dev)
62 {
63 int i;
64 int temp;
65
66 dev->ctx_bitmap = (unsigned long *) drm_alloc(PAGE_SIZE,
67 DRM_MEM_CTXBITMAP);
68 if(dev->ctx_bitmap == NULL) {
69 return -ENOMEM;
70 }
71 memset((void *) dev->ctx_bitmap, 0, PAGE_SIZE);
72 for(i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
73 temp = drm_ctxbitmap_next(dev);
74 DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp);
75 }
76
77 return 0;
78 }
79
drm_ctxbitmap_cleanup(drm_device_t * dev)80 void drm_ctxbitmap_cleanup(drm_device_t *dev)
81 {
82 drm_free((void *)dev->ctx_bitmap, PAGE_SIZE,
83 DRM_MEM_CTXBITMAP);
84 }
85
86