LXR linux/arch/frv/mm/cache-page.c

   1/* cache-page.c: whole-page cache wrangling functions for MMU linux
   2 *
   3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11#include <linux/sched.h>
  12#include <linux/mm.h>
  13#include <linux/highmem.h>
  14#include <linux/module.h>
  15#include <asm/pgalloc.h>
  16
  17/*****************************************************************************/
  18/*
  19 * DCF takes a virtual address and the page may not currently have one
  20 * - temporarily hijack a kmap_atomic() slot and attach the page to it
  21 */
  22void flush_dcache_page(struct page *page)
  23{
  24        unsigned long dampr2;
  25        void *vaddr;
  26
  27        dampr2 = __get_DAMPR(2);
  28
  29        vaddr = kmap_atomic(page, __KM_CACHE);
  30
  31        frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
  32
  33        kunmap_atomic(vaddr, __KM_CACHE);
  34
  35        if (dampr2) {
  36                __set_DAMPR(2, dampr2);
  37                __set_IAMPR(2, dampr2);
  38        }
  39
  40} /* end flush_dcache_page() */
  41
  42EXPORT_SYMBOL(flush_dcache_page);
  43
  44/*****************************************************************************/
  45/*
  46 * ICI takes a virtual address and the page may not currently have one
  47 * - so we temporarily attach the page to a bit of virtual space so that is can be flushed
  48 */
  49void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  50                             unsigned long start, unsigned long len)
  51{
  52        unsigned long dampr2;
  53        void *vaddr;
  54
  55        dampr2 = __get_DAMPR(2);
  56
  57        vaddr = kmap_atomic(page, __KM_CACHE);
  58
  59        start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
  60        frv_cache_wback_inv(start, start + len);
  61
  62        kunmap_atomic(vaddr, __KM_CACHE);
  63
  64        if (dampr2) {
  65                __set_DAMPR(2, dampr2);
  66                __set_IAMPR(2, dampr2);
  67        }
  68
  69} /* end flush_icache_user_range() */
  70
  71EXPORT_SYMBOL(flush_icache_user_range);
  72