diff options
Diffstat (limited to 'bsd/vm.c')
| -rw-r--r-- | bsd/vm.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/bsd/vm.c b/bsd/vm.c new file mode 100644 index 000000000..66bd29afb --- /dev/null +++ b/bsd/vm.c @@ -0,0 +1,103 @@ +/* vm.c -- Memory mapping for DRM -*- c -*- + * Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com + * Revised: Fri Aug 20 22:48:11 1999 by faith@precisioninsight.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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. + * + * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.7 1999/08/21 02:48:34 faith Exp $ + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.1 1999/09/25 14:38:02 dawes Exp $ + * + */ + +#define __NO_VERSION__ +#include "drmP.h" + +#include <vm/vm.h> +#include <vm/pmap.h> + +static int drm_dma_mmap(dev_t kdev, vm_offset_t offset, int prot) +{ + drm_device_t *dev = kdev->si_drv1; + drm_device_dma_t *dma = dev->dma; + unsigned long physical; + unsigned long page; + + if (!dma) return -1; /* Error */ + if (!dma->pagelist) return -1; /* Nothing allocated */ + + page = offset >> PAGE_SHIFT; + physical = dma->pagelist[page]; + + DRM_DEBUG("0x%08x (page %lu) => 0x%08lx\n", offset, page, physical); + return atop(physical); +} + +int drm_mmap(dev_t kdev, vm_offset_t offset, int prot) +{ + drm_device_t *dev = kdev->si_drv1; + drm_map_t *map = NULL; + int i; + + /* DRM_DEBUG("offset = 0x%x\n", offset); */ + + if (dev->dma + && offset >= 0 + && offset < ptoa(dev->dma->page_count)) + return drm_dma_mmap(kdev, offset, prot); + + /* A sequential search of a linked list is + fine here because: 1) there will only be + about 5-10 entries in the list and, 2) a + DRI client only has to do this mapping + once, so it doesn't have to be optimized + for performance, even if the list was a + bit longer. */ + for (i = 0; i < dev->map_count; i++) { + map = dev->maplist[i]; + /* DRM_DEBUG("considering 0x%x..0x%x\n", map->offset, map->offset + map->size - 1); */ + if (offset >= map->offset + && offset < map->offset + map->size) break; + } + + if (i >= dev->map_count) { + DRM_DEBUG("can't find map\n"); + return -1; + } + if (!map || ((map->flags&_DRM_RESTRICTED) && suser(curproc))) { + DRM_DEBUG("restricted map\n"); + return -1; + } + + switch (map->type) { + case _DRM_FRAME_BUFFER: + case _DRM_REGISTERS: + return atop(offset); + case _DRM_SHM: + return atop(vtophys(offset)); + default: + return -1; /* This should never happen. */ + } + DRM_DEBUG("bailing out\n"); + + return -1; +} |