cacheflush.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 151 行

#ifndef _M68K_CACHEFLUSH_H
#define _M68K_CACHEFLUSH_H

#include <linux/mm.h>

/*
 * Cache handling functions
 */

#define flush_icache()						\
({								\
	if (CPU_IS_040_OR_060)					\
		__asm__ __volatile__("nop\n\t"			\
				     ".chip 68040\n\t"		\
				     "cinva %%ic\n\t"		\
				     ".chip 68k" : );		\
	else {							\
		unsigned long _tmp;				\
		__asm__ __volatile__("movec %%cacr,%0\n\t"	\
				     "orw %1,%0\n\t"		\
				     "movec %0,%%cacr"		\
				     : "=&d" (_tmp)		\
				     : "id" (FLUSH_I));	\
	}							\
})

/*
 * invalidate the cache for the specified memory range.
 * It starts at the physical address specified for
 * the given number of bytes.
 */
extern void cache_clear(unsigned long paddr, int len);
/*
 * push any dirty cache in the specified memory range.
 * It starts at the physical address specified for
 * the given number of bytes.
 */
extern void cache_push(unsigned long paddr, int len);

/*
 * push and invalidate pages in the specified user virtual
 * memory range.
 */
extern void cache_push_v(unsigned long vaddr, int len);

/* cache code */
#define FLUSH_I_AND_D	(0x00000808)
#define FLUSH_I		(0x00000008)

/* This is needed whenever the virtual mapping of the current
   process changes.  */
#define __flush_cache_all()					\
({								\
	if (CPU_IS_040_OR_060)					\
		__asm__ __volatile__("nop\n\t"			\
				     ".chip 68040\n\t"		\
				     "cpusha %dc\n\t"		\
				     ".chip 68k");		\
	else {							\
		unsigned long _tmp;				\
		__asm__ __volatile__("movec %%cacr,%0\n\t"	\
				     "orw %1,%0\n\t"		\
				     "movec %0,%%cacr"		\
				     : "=&d" (_tmp)		\
				     : "di" (FLUSH_I_AND_D));	\
	}							\
})

#define __flush_cache_030()					\
({								\
	if (CPU_IS_020_OR_030) {				\
		unsigned long _tmp;				\
		__asm__ __volatile__("movec %%cacr,%0\n\t"	\
				     "orw %1,%0\n\t"		\
				     "movec %0,%%cacr"		\
				     : "=&d" (_tmp)		\
				     : "di" (FLUSH_I_AND_D));	\
	}							\
})

#define flush_cache_all() __flush_cache_all()

#define flush_cache_vmap(start, end)		flush_cache_all()
#define flush_cache_vunmap(start, end)		flush_cache_all()

static inline void flush_cache_mm(struct mm_struct *mm)
{
	if (mm == current->mm)
		__flush_cache_030();
}

/* flush_cache_range/flush_cache_page must be macros to avoid
   a dependency on linux/mm.h, which includes this file... */
static inline void flush_cache_range(struct vm_area_struct *vma,
				     unsigned long start,
				     unsigned long end)
{
	if (vma->vm_mm == current->mm)
	        __flush_cache_030();
}

static inline void flush_cache_page(struct vm_area_struct *vma,
				    unsigned long vmaddr)
{
	if (vma->vm_mm == current->mm)
	        __flush_cache_030();
}


/* Push the page at kernel virtual address and clear the icache */
/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
static inline void __flush_page_to_ram(void *vaddr)
{
	if (CPU_IS_040_OR_060) {
		__asm__ __volatile__("nop\n\t"
				     ".chip 68040\n\t"
				     "cpushp %%bc,(%0)\n\t"
				     ".chip 68k"
				     : : "a" (__pa(vaddr)));
	} else {
		unsigned long _tmp;
		__asm__ __volatile__("movec %%cacr,%0\n\t"
				     "orw %1,%0\n\t"
				     "movec %0,%%cacr"
				     : "=&d" (_tmp)
				     : "di" (FLUSH_I));
	}
}

#define flush_dcache_page(page)		__flush_page_to_ram(page_address(page))
#define flush_dcache_mmap_lock(mapping)		do { } while (0)
#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
#define flush_icache_page(vma, page)	__flush_page_to_ram(page_address(page))
#define flush_icache_user_range(vma,pg,adr,len)	do { } while (0)

#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
	do {					\
		flush_cache_page(vma, vaddr);	\
		memcpy(dst, src, len);		\
	} while (0)

#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
	do {					\
		flush_cache_page(vma, vaddr);	\
		memcpy(dst, src, len);		\
	} while (0)

extern void flush_icache_range(unsigned long address, unsigned long endaddr);

#endif /* _M68K_CACHEFLUSH_H */