137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* $NetBSD: drm_vm.c,v 1.17 2009/03/29 19:50:17 mrg Exp $ */
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/*-
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* Copyright 2003 Eric Anholt
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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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* ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: drm_vm.c,v 1.17 2009/03/29 19:50:17 mrg Exp $");
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/*
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__FBSDID("$FreeBSD: src/sys/dev/drm/drm_vm.c,v 1.2 2005/11/28 23:13:53 anholt Exp $");
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*/
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#include "drmP.h"
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#include "drm.h"
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/* WARNING: pure, unadulterated EVIL ahead! */
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paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
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{
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DRM_DEVICE;
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drm_local_map_t *map;
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drm_file_t *priv;
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drm_map_type_t type;
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paddr_t phys;
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off_t roffset;
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DRM_DEBUG("dev %llx offset %llx prot %d\n", (long long)kdev, (long long)offset, prot);
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DRM_LOCK();
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priv = drm_find_file_by_proc(dev, DRM_CURPROC);
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DRM_UNLOCK();
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if (priv == NULL) {
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DRM_ERROR("can't find authenticator\n");
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return -1;
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}
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if (!priv->authenticated)
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return -1;
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if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
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drm_device_dma_t *dma = dev->dma;
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DRM_SPINLOCK(&dev->dma_lock);
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if (dma->pagelist != NULL) {
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unsigned long page = offset >> PAGE_SHIFT;
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unsigned long pphys = dma->pagelist[page];
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DRM_SPINUNLOCK(&dev->dma_lock);
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#ifdef macppc
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return pphys;
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#else
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return atop(pphys);
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#endif
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} else {
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DRM_SPINUNLOCK(&dev->dma_lock);
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return -1;
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}
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}
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/* A sequential search of a linked list is
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fine here because: 1) there will only be
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about 5-10 entries in the list and, 2) a
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DRI client only has to do this mapping
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once, so it doesn't have to be optimized
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for performance, even if the list was a
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bit longer. */
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DRM_LOCK();
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roffset = DRM_NETBSD_HANDLE2ADDR(offset);
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TAILQ_FOREACH(map, &dev->maplist, link) {
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if (DRM_HANDLE_NEEDS_MASK(map->type)) {
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if (roffset >= (uintptr_t)map->handle && roffset < (uintptr_t)map->handle + map->size)
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break;
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} else {
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if (offset >= map->offset && offset < map->offset + map->size)
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break;
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}
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}
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if (map == NULL) {
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DRM_UNLOCK();
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DRM_DEBUG("can't find map\n");
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return -1;
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}
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if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
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DRM_UNLOCK();
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DRM_DEBUG("restricted map\n");
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return -1;
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}
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type = map->type;
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DRM_UNLOCK();
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switch (type) {
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case _DRM_FRAME_BUFFER:
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case _DRM_REGISTERS:
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case _DRM_AGP:
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phys = offset;
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break;
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case _DRM_CONSISTENT:
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phys = vtophys((paddr_t)map->handle + (offset - map->offset));
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break;
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case _DRM_SCATTER_GATHER:
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case _DRM_SHM:
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phys = vtophys(roffset);
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break;
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default:
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DRM_ERROR("bad map type %d\n", type);
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return -1; /* This should never happen. */
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}
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DRM_DEBUG("going to return phys %lx\n", phys);
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#ifdef macppc
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return phys;
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#else
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return atop(phys);
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#endif
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}
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