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 <asm/pgalloc.h>
  15
  16 /*****************************************************************************/
  17 /*
  18  * DCF takes a virtual address and the page may not currently have one
  19  * - temporarily hijack a kmap_atomic() slot and attach the page to it
  20  */
  21 void flush_dcache_page(struct page *page)
  22 {
  23         unsigned long dampr2;
  24         void *vaddr;
  25
  26         dampr2 = __get_DAMPR(2);
  27
  28         vaddr = kmap_atomic(page, __KM_CACHE);
  29
  30         frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
  31
  32         kunmap_atomic(vaddr, __KM_CACHE);
  33
  34         if (dampr2) {
  35                 __set_DAMPR(2, dampr2);
  36                 __set_IAMPR(2, dampr2);
  37         }
  38
  39 } /* end flush_dcache_page() */
  40
  41 /*****************************************************************************/
  42 /*
  43  * ICI takes a virtual address and the page may not currently have one
  44  * - so we temporarily attach the page to a bit of virtual space so that is can be flushed
  45  */
  46 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  47                              unsigned long start, unsigned long len)
  48 {
  49         unsigned long dampr2;
  50         void *vaddr;
  51
  52         dampr2 = __get_DAMPR(2);
  53
  54         vaddr = kmap_atomic(page, __KM_CACHE);
  55
  56         start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
  57         frv_cache_wback_inv(start, start + len);
  58
  59         kunmap_atomic(vaddr, __KM_CACHE);
  60
  61         if (dampr2) {
  62                 __set_DAMPR(2, dampr2);
  63                 __set_IAMPR(2, dampr2);
  64         }
  65
  66 } /* end flush_icache_user_range() */