1. 根目录:
2. arch
3. sh
4. include
5. asm
6. cacheflush.h

#ifndef __ASM_SH_CACHEFLUSH_H
#define __ASM_SH_CACHEFLUSH_H

#ifdef __KERNEL__

#include <linux/mm.h>

/*
 * Cache flushing:
 *
 *  - flush_cache_all() flushes entire cache
 *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
 *  - flush_cache_dup mm(mm) handles cache flushing when forking
 *  - flush_cache_page(mm, vmaddr, pfn) flushes a single page
 *  - flush_cache_range(vma, start, end) flushes a range of pages
 *
 *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
 *  - flush_icache_range(start, end) flushes(invalidates) a range for icache
 *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
 *  - flush_cache_sigtramp(vaddr) flushes the signal trampoline
 */
extern void (*local_flush_cache_all)(void *args);
extern void (*local_flush_cache_mm)(void *args);
extern void (*local_flush_cache_dup_mm)(void *args);
extern void (*local_flush_cache_page)(void *args);
extern void (*local_flush_cache_range)(void *args);
extern void (*local_flush_dcache_page)(void *args);
extern void (*local_flush_icache_range)(void *args);
extern void (*local_flush_icache_page)(void *args);
extern void (*local_flush_cache_sigtramp)(void *args);

static inline void cache_noop(void *args) { }

extern void (*__flush_wback_region)(void *start, int size);
extern void (*__flush_purge_region)(void *start, int size);
extern void (*__flush_invalidate_region)(void *start, int size);

extern void flush_cache_all(void);
extern void flush_cache_mm(struct mm_struct *mm);
extern void flush_cache_dup_mm(struct mm_struct *mm);
extern void flush_cache_page(struct vm_area_struct *vma,
				unsigned long addr, unsigned long pfn);
extern void flush_cache_range(struct vm_area_struct *vma,
				 unsigned long start, unsigned long end);
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
extern void flush_dcache_page(struct page *page);
extern void flush_icache_range(unsigned long start, unsigned long end);
extern void flush_icache_page(struct vm_area_struct *vma,
				 struct page *page);
extern void flush_cache_sigtramp(unsigned long address);

struct flusher_data {
	struct vm_area_struct *vma;
	unsigned long addr1, addr2;
};

#define ARCH_HAS_FLUSH_ANON_PAGE
extern void __flush_anon_page(struct page *page, unsigned long);

static inline void flush_anon_page(struct vm_area_struct *vma,
				   struct page *page, unsigned long vmaddr)
{
	if (boot_cpu_data.dcache.n_aliases && PageAnon(page))
		__flush_anon_page(page, vmaddr);
}
static inline void flush_kernel_vmap_range(void *addr, int size)
{
	__flush_wback_region(addr, size);
}
static inline void invalidate_kernel_vmap_range(void *addr, int size)
{
	__flush_invalidate_region(addr, size);
}

#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
static inline void flush_kernel_dcache_page(struct page *page)
{
	flush_dcache_page(page);
}

extern void copy_to_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len);

extern void copy_from_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len);

#define flush_cache_vmap(start, end)		local_flush_cache_all(NULL)
#define flush_cache_vunmap(start, end)		local_flush_cache_all(NULL)

#define flush_dcache_mmap_lock(mapping)		do { } while (0)
#define flush_dcache_mmap_unlock(mapping)	do { } while (0)

void kmap_coherent_init(void);
void *kmap_coherent(struct page *page, unsigned long addr);
void kunmap_coherent(void *kvaddr);

#define PG_dcache_clean	PG_arch_1

void cpu_cache_init(void);

#endif /* __KERNEL__ */
#endif /* __ASM_SH_CACHEFLUSH_H */