uncached.h

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#ifndef __ASM_SH_UNCACHED_H
#define __ASM_SH_UNCACHED_H

#include <linux/bug.h>

#ifdef CONFIG_UNCACHED_MAPPING
extern unsigned long cached_to_uncached;
extern unsigned long uncached_size;
extern unsigned long uncached_start, uncached_end;

extern int virt_addr_uncached(unsigned long kaddr);
extern void uncached_init(void);
extern void uncached_resize(unsigned long size);

/*
 * Jump to uncached area.
 * When handling TLB or caches, we need to do it from an uncached area.
 */
#define jump_to_uncached()          \
do {                        \
    unsigned long __dummy;          \
                        \
    __asm__ __volatile__(           \
        "mova   1f, %0\n\t"     \
        "add    %1, %0\n\t"     \
        "jmp    @%0\n\t"        \
        " nop\n\t"          \
        ".balign 4\n"           \
        "1:"                \
        : "=&z" (__dummy)       \
        : "r" (cached_to_uncached));    \
} while (0)

/*
 * Back to cached area.
 */
#define back_to_cached()                \
do {                            \
    unsigned long __dummy;              \
    ctrl_barrier();                 \
    __asm__ __volatile__(               \
        "mov.l  1f, %0\n\t"         \
        "jmp    @%0\n\t"            \
        " nop\n\t"              \
        ".balign 4\n"               \
        "1: .long 2f\n"         \
        "2:"                    \
        : "=&r" (__dummy));         \
} while (0)
#else
#define virt_addr_uncached(kaddr)   (0)
#define uncached_init()         do { } while (0)
#define uncached_resize(size)       BUG()
#define jump_to_uncached()      do { } while (0)
#define back_to_cached()        do { } while (0)
#endif

#endif /* __ASM_SH_UNCACHED_H */