sys/dev/drm/include/linux/highmem.h

   1 /*
   2  * Copyright (c) 2014 François Tigeot
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_HIGHMEM_H_
  28 #define _LINUX_HIGHMEM_H_
  29
  30 #include <machine/vmparam.h>
  31
  32 #include <linux/uaccess.h>
  33
  34 static inline void *kmap(struct vm_page *pg)
  35 {
  36         return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pg));
  37 }
  38
  39 static inline void kunmap(struct vm_page *pg)
  40 {
  41         /* Nothing to do on systems with a direct memory map */
  42 }
  43
  44 static inline void *kmap_atomic(struct vm_page *pg)
  45 {
  46         return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pg));
  47 }
  48
  49 static inline void kunmap_atomic(void *vaddr)
  50 {
  51         /* Nothing to do on systems with a direct memory map */
  52 }
  53
  54 #endif  /* _LINUX_HIGHMEM_H_ */