release/src-rt-6.x.4708/linux/linux-2.6.36/arch/cris/include/arch-v10/arch/page.h

   1 #ifndef _CRIS_ARCH_PAGE_H
   2 #define _CRIS_ARCH_PAGE_H
   3
   4
   5 #ifdef __KERNEL__
   6
   7 /* This handles the memory map.. */
   8 #ifdef CONFIG_CRIS_LOW_MAP
   9 #define PAGE_OFFSET             KSEG_6   /* kseg_6 is mapped to physical ram */
  10 #else
  11 #define PAGE_OFFSET             KSEG_C   /* kseg_c is mapped to physical ram */
  12 #endif
  13
  14 /* macros to convert between really physical and virtual addresses
  15  * by stripping a selected bit, we can convert between KSEG_x and
  16  * 0x40000000 where the DRAM really resides
  17  */
  18
  19 #ifdef CONFIG_CRIS_LOW_MAP
  20 /* we have DRAM virtually at 0x6 */
  21 #define __pa(x)                 ((unsigned long)(x) & 0xdfffffff)
  22 #define __va(x)                 ((void *)((unsigned long)(x) | 0x20000000))
  23 #else
  24 /* we have DRAM virtually at 0xc */
  25 #define __pa(x)                 ((unsigned long)(x) & 0x7fffffff)
  26 #define __va(x)                 ((void *)((unsigned long)(x) | 0x80000000))
  27 #endif
  28
  29 #endif
  30 #endif