diff options
Diffstat (limited to 'drivers/char/drm/ctxbitmap.c')
| -rw-r--r-- | drivers/char/drm/ctxbitmap.c | 85 |
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); +} + |