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86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
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* $FreeBSD$
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*/
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#include <vm/vm.h>
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#include <vm/pmap.h>
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static int DRM(dma_mmap)(dev_t kdev, vm_offset_t offset, int prot)
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{
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drm_device_t *dev = kdev->si_drv1;
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drm_device_dma_t *dma = dev->dma;
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unsigned long physical;
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unsigned long page;
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if (!dma) return -1; /* Error */
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if (!dma->pagelist) return -1; /* Nothing allocated */
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page = offset >> PAGE_SHIFT;
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physical = dma->pagelist[page];
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DRM_DEBUG("0x%08x (page %lu) => 0x%08lx\n", offset, page, physical);
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return atop(physical);
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}
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int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
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{
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drm_device_t *dev = kdev->si_drv1;
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drm_map_t *map = NULL;
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drm_map_list_entry_t *listentry=NULL;
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/*drm_file_t *priv;*/
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/* DRM_DEBUG("offset = 0x%x\n", offset);*/
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/*XXX Fixme */
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/*priv = DRM(find_file_by_proc)(dev, p);
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if (!priv) {
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DRM_DEBUG("can't find authenticator\n");
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return EINVAL;
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}
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if (!priv->authenticated) return DRM_OS_ERR(EACCES);*/
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if (dev->dma
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&& offset >= 0
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&& offset < ptoa(dev->dma->page_count))
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return DRM(dma_mmap)(kdev, offset, prot);
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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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TAILQ_FOREACH(listentry, dev->maplist, link) {
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map = listentry->map;
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/* DRM_DEBUG("considering 0x%x..0x%x\n", map->offset, map->offset + map->size - 1);*/
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if (offset >= map->offset
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&& offset < map->offset + map->size) break;
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}
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if (!listentry) {
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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) && suser(DRM_OS_CURPROC))) {
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DRM_DEBUG("restricted map\n");
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return -1;
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}
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switch (map->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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return atop(offset);
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case _DRM_SHM:
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return atop(vtophys(offset));
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default:
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return -1; /* This should never happen. */
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}
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DRM_DEBUG("bailing out\n");
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return -1;
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}
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