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/* 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:
case _DRM_AGP:
return atop(offset);
case _DRM_SHM:
return atop(vtophys(offset));
default:
return -1; /* This should never happen. */
}
DRM_DEBUG("bailing out\n");
return -1;
}
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