Release 4.14 arch/sh/include/asm/uncached.h

/* SPDX-License-Identifier: GPL-2.0 */
#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 */
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Paul Mundt
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Directory: arch/sh/include/asm

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