cache-page.c
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/* cache-page.c: whole-page cache wrangling functions for MMU linux
*
* Copyright (C) 2004 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 License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <asm/pgalloc.h>
/*****************************************************************************/
/*
* DCF takes a virtual address and the page may not currently have one
* - temporarily hijack a kmap_atomic() slot and attach the page to it
*/
void flush_dcache_page(struct page *page)
{
unsigned long dampr2;
void *vaddr;
dampr2 = __get_DAMPR(2);
vaddr = kmap_atomic_primary(page);
frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
kunmap_atomic_primary(vaddr);
if (dampr2) {
__set_DAMPR(2, dampr2);
__set_IAMPR(2, dampr2);
}
} /* end flush_dcache_page() */
EXPORT_SYMBOL(flush_dcache_page);
/*****************************************************************************/
/*
* ICI takes a virtual address and the page may not currently have one
* - so we temporarily attach the page to a bit of virtual space so that is can be flushed
*/
void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
unsigned long start, unsigned long len)
{
unsigned long dampr2;
void *vaddr;
dampr2 = __get_DAMPR(2);
vaddr = kmap_atomic_primary(page);
start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
frv_cache_wback_inv(start, start + len);
kunmap_atomic_primary(vaddr);
if (dampr2) {
__set_DAMPR(2, dampr2);
__set_IAMPR(2, dampr2);
}
} /* end flush_icache_user_range() */
EXPORT_SYMBOL(flush_icache_user_range);