[net-next-2.6.git] / arch / frv / mm / cache-page.c

/* 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, __KM_CACHE);

	frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);

	kunmap_atomic_primary(vaddr, __KM_CACHE);

	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, __KM_CACHE);

	start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
	frv_cache_wback_inv(start, start + len);

	kunmap_atomic_primary(vaddr, __KM_CACHE);

	if (dampr2) {
		__set_DAMPR(2, dampr2);
		__set_IAMPR(2, dampr2);
	}

} /* end flush_icache_user_range() */

EXPORT_SYMBOL(flush_icache_user_range);
Commit	Line	Data
1da177e4 LT	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>
40234401	14	#include <linux/module.h>
1da177e4 LT	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
3e4d3af5	29	vaddr = kmap_atomic_primary(page, __KM_CACHE);
1da177e4 LT	30
	31	frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
	32
3e4d3af5	33	kunmap_atomic_primary(vaddr, __KM_CACHE);
1da177e4 LT	34
	35	if (dampr2) {
	36	__set_DAMPR(2, dampr2);
	37	__set_IAMPR(2, dampr2);
	38	}
	39
	40	} /* end flush_dcache_page() */
	41
40234401 DH	42	EXPORT_SYMBOL(flush_dcache_page);
40234401 DH	43
1da177e4 LT	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
3e4d3af5	57	vaddr = kmap_atomic_primary(page, __KM_CACHE);
1da177e4 LT	58
	59	start = (start & ~PAGE_MASK) \| (unsigned long) vaddr;
	60	frv_cache_wback_inv(start, start + len);
	61
3e4d3af5	62	kunmap_atomic_primary(vaddr, __KM_CACHE);
1da177e4 LT	63
	64	if (dampr2) {
	65	__set_DAMPR(2, dampr2);
	66	__set_IAMPR(2, dampr2);
	67	}
	68
	69	} /* end flush_icache_user_range() */
40234401 DH	70
40234401 DH	71	EXPORT_SYMBOL(flush_icache_user_range);