86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* ctxbitmap.c -- Context bitmap management -*- linux-c -*-
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* Created: Thu Jan 6 03:56:42 2000 by jhartmann@precisioninsight.com
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*
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* Copyright 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Author: Jeff Hartmann <jhartmann@valinux.com>
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*
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*/
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#define __NO_VERSION__
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#include "drmP.h"
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void drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle)
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{
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if (ctx_handle < 0) goto failed;
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if (ctx_handle < DRM_MAX_CTXBITMAP) {
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clear_bit(ctx_handle, dev->ctx_bitmap);
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return;
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}
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failed:
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DRM_ERROR("Attempt to free invalid context handle: %d\n",
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ctx_handle);
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return;
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}
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int drm_ctxbitmap_next(drm_device_t *dev)
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{
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int bit;
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bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP);
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if (bit < DRM_MAX_CTXBITMAP) {
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set_bit(bit, dev->ctx_bitmap);
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DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit);
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return bit;
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}
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return -1;
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}
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int drm_ctxbitmap_init(drm_device_t *dev)
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{
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int i;
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int temp;
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dev->ctx_bitmap = (unsigned long *) drm_alloc(PAGE_SIZE,
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DRM_MEM_CTXBITMAP);
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if(dev->ctx_bitmap == NULL) {
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return -ENOMEM;
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}
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memset((void *) dev->ctx_bitmap, 0, PAGE_SIZE);
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for(i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
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temp = drm_ctxbitmap_next(dev);
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DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp);
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}
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return 0;
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}
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void drm_ctxbitmap_cleanup(drm_device_t *dev)
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{
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drm_free((void *)dev->ctx_bitmap, PAGE_SIZE,
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DRM_MEM_CTXBITMAP);
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}
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