72 lines
1.9 KiB
C
72 lines
1.9 KiB
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);
|
|
|
|
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);
|