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  */
  22 void 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
  42 EXPORT_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  */
  49 void 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
  71 EXPORT_SYMBOL(flush_icache_user_range);