arch/sh/include/asm/uncached.h

   1 #ifndef __ASM_SH_UNCACHED_H
   2 #define __ASM_SH_UNCACHED_H
   3
   4 #include <linux/bug.h>
   5
   6 #ifdef CONFIG_UNCACHED_MAPPING
   7 extern unsigned long cached_to_uncached;
   8 extern unsigned long uncached_size;
   9 extern unsigned long uncached_start, uncached_end;
  10
  11 extern int virt_addr_uncached(unsigned long kaddr);
  12 extern void uncached_init(void);
  13 extern void uncached_resize(unsigned long size);
  14
  15 /*
  16  * Jump to uncached area.
  17  * When handling TLB or caches, we need to do it from an uncached area.
  18  */
  19 #define jump_to_uncached()                      \
  20 do {                                            \
  21         unsigned long __dummy;                  \
  22                                                 \
  23         __asm__ __volatile__(                   \
  24                 "mova   1f, %0\n\t"             \
  25                 "add    %1, %0\n\t"             \
  26                 "jmp    @%0\n\t"                \
  27                 " nop\n\t"                      \
  28                 ".balign 4\n"                   \
  29                 "1:"                            \
  30                 : "=&z" (__dummy)               \
  31                 : "r" (cached_to_uncached));    \
  32 } while (0)
  33
  34 /*
  35  * Back to cached area.
  36  */
  37 #define back_to_cached()                                \
  38 do {                                                    \
  39         unsigned long __dummy;                          \
  40         ctrl_barrier();                                 \
  41         __asm__ __volatile__(                           \
  42                 "mov.l  1f, %0\n\t"                     \
  43                 "jmp    @%0\n\t"                        \
  44                 " nop\n\t"                              \
  45                 ".balign 4\n"                           \
  46                 "1:     .long 2f\n"                     \
  47                 "2:"                                    \
  48                 : "=&r" (__dummy));                     \
  49 } while (0)
  50 #else
  51 #define virt_addr_uncached(kaddr)       (0)
  52 #define uncached_init()                 do { } while (0)
  53 #define uncached_resize(size)           BUG()
  54 #define jump_to_uncached()              do { } while (0)
  55 #define back_to_cached()                do { } while (0)
  56 #endif
  57
  58 #endif /* __ASM_SH_UNCACHED_H */