cacheflush.h

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/* cacheflush.h: FRV cache flushing routines
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ASM_CACHEFLUSH_H
#define _ASM_CACHEFLUSH_H

/* Keep includes the same across arches.  */
#include <linux/mm.h>

/*
 * virtually-indexed cache management (our cache is physically indexed)
 */
#define flush_cache_all()           do {} while(0)
#define flush_cache_mm(mm)          do {} while(0)
#define flush_cache_dup_mm(mm)          do {} while(0)
#define flush_cache_range(mm, start, end)   do {} while(0)
#define flush_cache_page(vma, vmaddr, pfn)  do {} while(0)
#define flush_cache_vmap(start, end)        do {} while(0)
#define flush_cache_vunmap(start, end)      do {} while(0)
#define flush_dcache_mmap_lock(mapping)     do {} while(0)
#define flush_dcache_mmap_unlock(mapping)   do {} while(0)

/*
 * physically-indexed cache management
 * - see arch/frv/lib/cache.S
 */
extern void frv_dcache_writeback(unsigned long start, unsigned long size);
extern void frv_cache_invalidate(unsigned long start, unsigned long size);
extern void frv_icache_invalidate(unsigned long start, unsigned long size);
extern void frv_cache_wback_inv(unsigned long start, unsigned long size);

static inline void __flush_cache_all(void)
{
    asm volatile("  dcef    @(gr0,gr0),#1   \n"
             "  icei    @(gr0,gr0),#1   \n"
             "  membar          \n"
             : : : "memory"
             );
}

/* dcache/icache coherency... */
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
#ifdef CONFIG_MMU
extern void flush_dcache_page(struct page *page);
#else
static inline void flush_dcache_page(struct page *page)
{
    unsigned long addr = page_to_phys(page);
    frv_dcache_writeback(addr, addr + PAGE_SIZE);
}
#endif

static inline void flush_page_to_ram(struct page *page)
{
    flush_dcache_page(page);
}

static inline void flush_icache(void)
{
    __flush_cache_all();
}

static inline void flush_icache_range(unsigned long start, unsigned long end)
{
    frv_cache_wback_inv(start, end);
}

#ifdef CONFIG_MMU
extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
                    unsigned long start, unsigned long len);
#else
static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
                       unsigned long start, unsigned long len)
{
    frv_cache_wback_inv(start, start + len);
}
#endif

static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
    flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
}

/*
 * permit ptrace to access another process's address space through the icache
 * and the dcache
 */
#define copy_to_user_page(vma, page, vaddr, dst, src, len)  \
do {                                \
    memcpy((dst), (src), (len));                \
    flush_icache_user_range((vma), (page), (vaddr), (len)); \
} while(0)

#define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
    memcpy((dst), (src), (len))

#endif /* _ASM_CACHEFLUSH_H */