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cache.c

/* MN10300 Cache flushing routines
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/threads.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/uaccess.h>

EXPORT_SYMBOL(mn10300_icache_inv);
EXPORT_SYMBOL(mn10300_dcache_inv);
EXPORT_SYMBOL(mn10300_dcache_inv_range);
EXPORT_SYMBOL(mn10300_dcache_inv_range2);
EXPORT_SYMBOL(mn10300_dcache_inv_page);

#ifdef CONFIG_MN10300_CACHE_WBACK
EXPORT_SYMBOL(mn10300_dcache_flush);
EXPORT_SYMBOL(mn10300_dcache_flush_inv);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
EXPORT_SYMBOL(mn10300_dcache_flush_range);
EXPORT_SYMBOL(mn10300_dcache_flush_range2);
EXPORT_SYMBOL(mn10300_dcache_flush_page);
#endif

/*
 * write a page back from the dcache and invalidate the icache so that we can
 * run code from it that we've just written into it
 */
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
      mn10300_dcache_flush_page(page_to_phys(page));
      mn10300_icache_inv();
}
EXPORT_SYMBOL(flush_icache_page);

/*
 * write some code we've just written back from the dcache and invalidate the
 * icache so that we can run that code
 */
void flush_icache_range(unsigned long start, unsigned long end)
{
#ifdef CONFIG_MN10300_CACHE_WBACK
      unsigned long addr, size, off;
      struct page *page;
      pgd_t *pgd;
      pud_t *pud;
      pmd_t *pmd;
      pte_t *ppte, pte;

      for (; start < end; start += size) {
            /* work out how much of the page to flush */
            off = start & (PAGE_SIZE - 1);

            size = end - start;
            if (size > PAGE_SIZE - off)
                  size = PAGE_SIZE - off;

            /* get the physical address the page is mapped to from the page
             * tables */
            pgd = pgd_offset(current->mm, start);
            if (!pgd || !pgd_val(*pgd))
                  continue;

            pud = pud_offset(pgd, start);
            if (!pud || !pud_val(*pud))
                  continue;

            pmd = pmd_offset(pud, start);
            if (!pmd || !pmd_val(*pmd))
                  continue;

            ppte = pte_offset_map(pmd, start);
            if (!ppte)
                  continue;
            pte = *ppte;
            pte_unmap(ppte);

            if (pte_none(pte))
                  continue;

            page = pte_page(pte);
            if (!page)
                  continue;

            addr = page_to_phys(page);

            /* flush the dcache and invalidate the icache coverage on that
             * region */
            mn10300_dcache_flush_range2(addr + off, size);
      }
#endif

      mn10300_icache_inv();
}
EXPORT_SYMBOL(flush_icache_range);

/*
 * allow userspace to flush the instruction cache
 */
asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
{
      if (end < start)
            return -EINVAL;

      flush_icache_range(start, end);
      return 0;
}

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