arch/sh/mm/mmap.c

   1 /*
   2  * arch/sh/mm/mmap.c
   3  *
   4  * Copyright (C) 2008  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/io.h>
  11 #include <linux/mm.h>
  12 #include <asm/page.h>
  13
  14 /*
  15  * You really shouldn't be using read() or write() on /dev/mem.  This
  16  * might go away in the future.
  17  */
  18 int valid_phys_addr_range(unsigned long addr, size_t count)
  19 {
  20         if (addr < __MEMORY_START)
  21                 return 0;
  22         if (addr + count > __pa(high_memory))
  23                 return 0;
  24
  25         return 1;
  26 }
  27
  28 int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
  29 {
  30         return 1;
  31 }