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cache.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2007 MIPS Technologies, Inc.
 */
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/mm.h>

#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>

/* Cache operations. */
void (*flush_cache_all)(void);
void (*__flush_cache_all)(void);
void (*flush_cache_mm)(struct mm_struct *mm);
void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
      unsigned long end);
void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
      unsigned long pfn);
void (*flush_icache_range)(unsigned long start, unsigned long end);

void (*__flush_cache_vmap)(void);
void (*__flush_cache_vunmap)(void);

/* MIPS specific cache operations */
void (*flush_cache_sigtramp)(unsigned long addr);
void (*local_flush_data_cache_page)(void * addr);
void (*flush_data_cache_page)(unsigned long addr);
void (*flush_icache_all)(void);

EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
EXPORT_SYMBOL(flush_data_cache_page);

#ifdef CONFIG_DMA_NONCOHERENT

/* DMA cache operations. */
void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
void (*_dma_cache_wback)(unsigned long start, unsigned long size);
void (*_dma_cache_inv)(unsigned long start, unsigned long size);

EXPORT_SYMBOL(_dma_cache_wback_inv);

#endif /* CONFIG_DMA_NONCOHERENT */

/*
 * We could optimize the case where the cache argument is not BCACHE but
 * that seems very atypical use ...
 */
asmlinkage int sys_cacheflush(unsigned long addr,
      unsigned long bytes, unsigned int cache)
{
      if (bytes == 0)
            return 0;
      if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
            return -EFAULT;

      flush_icache_range(addr, addr + bytes);

      return 0;
}

void __flush_dcache_page(struct page *page)
{
      struct address_space *mapping = page_mapping(page);
      unsigned long addr;

      if (PageHighMem(page))
            return;
      if (mapping && !mapping_mapped(mapping)) {
            SetPageDcacheDirty(page);
            return;
      }

      /*
       * We could delay the flush for the !page_mapping case too.  But that
       * case is for exec env/arg pages and those are %99 certainly going to
       * get faulted into the tlb (and thus flushed) anyways.
       */
      addr = (unsigned long) page_address(page);
      flush_data_cache_page(addr);
}

EXPORT_SYMBOL(__flush_dcache_page);

void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
      unsigned long addr = (unsigned long) page_address(page);

      if (pages_do_alias(addr, vmaddr)) {
            if (page_mapped(page) && !Page_dcache_dirty(page)) {
                  void *kaddr;

                  kaddr = kmap_coherent(page, vmaddr);
                  flush_data_cache_page((unsigned long)kaddr);
                  kunmap_coherent();
            } else
                  flush_data_cache_page(addr);
      }
}

EXPORT_SYMBOL(__flush_anon_page);

void __update_cache(struct vm_area_struct *vma, unsigned long address,
      pte_t pte)
{
      struct page *page;
      unsigned long pfn, addr;
      int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;

      pfn = pte_pfn(pte);
      if (unlikely(!pfn_valid(pfn)))
            return;
      page = pfn_to_page(pfn);
      if (page_mapping(page) && Page_dcache_dirty(page)) {
            addr = (unsigned long) page_address(page);
            if (exec || pages_do_alias(addr, address & PAGE_MASK))
                  flush_data_cache_page(addr);
            ClearPageDcacheDirty(page);
      }
}

unsigned long _page_cachable_default;
EXPORT_SYMBOL_GPL(_page_cachable_default);

static inline void setup_protection_map(void)
{
      protection_map[0] = PAGE_NONE;
      protection_map[1] = PAGE_READONLY;
      protection_map[2] = PAGE_COPY;
      protection_map[3] = PAGE_COPY;
      protection_map[4] = PAGE_READONLY;
      protection_map[5] = PAGE_READONLY;
      protection_map[6] = PAGE_COPY;
      protection_map[7] = PAGE_COPY;
      protection_map[8] = PAGE_NONE;
      protection_map[9] = PAGE_READONLY;
      protection_map[10] = PAGE_SHARED;
      protection_map[11] = PAGE_SHARED;
      protection_map[12] = PAGE_READONLY;
      protection_map[13] = PAGE_READONLY;
      protection_map[14] = PAGE_SHARED;
      protection_map[15] = PAGE_SHARED;
}

void __devinit cpu_cache_init(void)
{
      if (cpu_has_3k_cache) {
            extern void __weak r3k_cache_init(void);

            r3k_cache_init();
      }
      if (cpu_has_6k_cache) {
            extern void __weak r6k_cache_init(void);

            r6k_cache_init();
      }
      if (cpu_has_4k_cache) {
            extern void __weak r4k_cache_init(void);

            r4k_cache_init();
      }
      if (cpu_has_8k_cache) {
            extern void __weak r8k_cache_init(void);

            r8k_cache_init();
      }
      if (cpu_has_tx39_cache) {
            extern void __weak tx39_cache_init(void);

            tx39_cache_init();
      }

      setup_protection_map();
}

int __weak __uncached_access(struct file *file, unsigned long addr)
{
      if (file->f_flags & O_SYNC)
            return 1;

      return addr >= __pa(high_memory);
}

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