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

   1 /*
   2  * Copyright (c) 2014-2018 François Tigeot <ftigeot@wolfpond.org>
   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/kernel.h>
  33 #include <linux/bug.h>
  34 #include <linux/mm.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/hardirq.h>
  37
  38 #include <asm/cacheflush.h>
  39
  40 static inline struct page *
  41 kmap_to_page(void *addr)
  42 {
  43         return (struct page *)PHYS_TO_VM_PAGE(vtophys(addr));
  44 }
  45
  46 static inline void *kmap(struct page *pg)
  47 {
  48         return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg ));
  49 }
  50
  51 static inline void kunmap(struct page *pg)
  52 {
  53         /* Nothing to do on systems with a direct memory map */
  54 }
  55
  56 static inline void *kmap_atomic(struct page *pg)
  57 {
  58         return (void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS( (struct vm_page *)pg ));
  59 }
  60
  61 static inline void *
  62 kmap_atomic_prot(struct page *pg, pgprot_t prot)
  63 {
  64         return kmap_atomic(pg);
  65 }
  66
  67 static inline void kunmap_atomic(void *vaddr)
  68 {
  69         /* Nothing to do on systems with a direct memory map */
  70 }
  71
  72 #endif  /* _LINUX_HIGHMEM_H_ */