arch/sh/include/asm/uncached.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_UNCACHED_H
   3 #define __ASM_SH_UNCACHED_H
   4
   5 #include <linux/bug.h>
   6
   7 #ifdef CONFIG_UNCACHED_MAPPING
   8 extern unsigned long cached_to_uncached;
   9 extern unsigned long uncached_size;
  10 extern unsigned long uncached_start, uncached_end;
  11
  12 extern int virt_addr_uncached(unsigned long kaddr);
  13 extern void uncached_init(void);
  14 extern void uncached_resize(unsigned long size);
  15
  16 /*
  17  * Jump to uncached area.
  18  * When handling TLB or caches, we need to do it from an uncached area.
  19  */
  20 #define jump_to_uncached()                      \
  21 do {                                            \
  22         unsigned long __dummy;                  \
  23                                                 \
  24         __asm__ __volatile__(                   \
  25                 "mova   1f, %0\n\t"             \
  26                 "add    %1, %0\n\t"             \
  27                 "jmp    @%0\n\t"                \
  28                 " nop\n\t"                      \
  29                 ".balign 4\n"                   \
  30                 "1:"                            \
  31                 : "=&z" (__dummy)               \
  32                 : "r" (cached_to_uncached));    \
  33 } while (0)
  34
  35 /*
  36  * Back to cached area.
  37  */
  38 #define back_to_cached()                                \
  39 do {                                                    \
  40         unsigned long __dummy;                          \
  41         ctrl_barrier();                                 \
  42         __asm__ __volatile__(                           \
  43                 "mov.l  1f, %0\n\t"                     \
  44                 "jmp    @%0\n\t"                        \
  45                 " nop\n\t"                              \
  46                 ".balign 4\n"                           \
  47                 "1:     .long 2f\n"                     \
  48                 "2:"                                    \
  49                 : "=&r" (__dummy));                     \
  50 } while (0)
  51 #else
  52 #define virt_addr_uncached(kaddr)       (0)
  53 #define uncached_init()                 do { } while (0)
  54 #define uncached_resize(size)           BUG()
  55 #define jump_to_uncached()              do { } while (0)
  56 #define back_to_cached()                do { } while (0)
  57 #endif
  58
  59 #endif /* __ASM_SH_UNCACHED_H */