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/* ctxbitmap.c -- Context bitmap management
* Created: Thu Jan 6 03:56:42 2000 by jhartmann@precisioninsight.com
*
* Copyright 1999 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 = (u_int32_t *) 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);
}
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