arch/mips/loongson/common/mem.c

   1 /*
   2  * This program is free software; you can redistribute  it and/or modify it
   3  * under  the terms of  the GNU General  Public License as published by the
   4  * Free Software Foundation;  either version 2 of the  License, or (at your
   5  * option) any later version.
   6  */
   7 #include <linux/fs.h>
   8 #include <linux/fcntl.h>
   9 #include <linux/mm.h>
  10
  11 #include <asm/bootinfo.h>
  12
  13 #include <loongson.h>
  14 #include <mem.h>
  15
  16 void __init prom_init_memory(void)
  17 {
  18     add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
  19 #ifdef CONFIG_64BIT
  20     if (highmemsize > 0)
  21         add_memory_region(LOONGSON_HIGHMEM_START,
  22                 highmemsize << 20, BOOT_MEM_RAM);
  23 #endif /* CONFIG_64BIT */
  24 }
  25
  26 /* override of arch/mips/mm/cache.c: __uncached_access */
  27 int __uncached_access(struct file *file, unsigned long addr)
  28 {
  29         if (file->f_flags & O_SYNC)
  30                 return 1;
  31
  32         return addr >= __pa(high_memory) ||
  33                 ((addr >= LOONGSON_MMIO_MEM_START) &&
  34                  (addr < LOONGSON_MMIO_MEM_END));
  35 }