drivers/char/drm/drm_memory.h

   1 /**
   2  * \file drm_memory.h
   3  * Memory management wrappers for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include <linux/highmem.h>
  37 #include <linux/vmalloc.h>
  38 #include "drmP.h"
  39
  40 /**
  41  * Cut down version of drm_memory_debug.h, which used to be called
  42  * drm_memory.h.
  43  */
  44
  45 #if __OS_HAS_AGP
  46
  47 #include <linux/vmalloc.h>
  48
  49 #ifdef HAVE_PAGE_AGP
  50 #include <asm/agp.h>
  51 #else
  52 # ifdef __powerpc__
  53 #  define PAGE_AGP      __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
  54 # else
  55 #  define PAGE_AGP      PAGE_KERNEL
  56 # endif
  57 #endif
  58
  59 static inline unsigned long drm_follow_page(void *vaddr)
  60 {
  61         pgd_t *pgd = pgd_offset_k((unsigned long)vaddr);
  62         pud_t *pud = pud_offset(pgd, (unsigned long)vaddr);
  63         pmd_t *pmd = pmd_offset(pud, (unsigned long)vaddr);
  64         pte_t *ptep = pte_offset_kernel(pmd, (unsigned long)vaddr);
  65         return pte_pfn(*ptep) << PAGE_SHIFT;
  66 }
  67
  68 #else                           /* __OS_HAS_AGP */
  69
  70 static inline unsigned long drm_follow_page(void *vaddr)
  71 {
  72         return 0;
  73 }
  74
  75 #endif
  76
  77 void *drm_ioremap(unsigned long offset, unsigned long size,
  78                                 drm_device_t * dev);
  79
  80 void drm_ioremapfree(void *pt, unsigned long size,
  81                                    drm_device_t * dev);