kmap.c

linux 内核源代码

/* kmap.c: ioremapping handlers
 *
 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([e-mail])
 * - Derived from arch/m68k/mm/kmap.c
 *
 * 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/mm.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/vmalloc.h>

#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/io.h>
#include <asm/system.h>

#undef DEBUG

/*****************************************************************************/
/*
 * Map some physical address range into the kernel address space.
 */

void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
{
	return (void __iomem *)physaddr;
}

/*
 * Unmap a ioremap()ed region again
 */
void iounmap(void volatile __iomem *addr)
{
}

/*
 * Set new cache mode for some kernel address space.
 * The caller must push data for that range itself, if such data may already
 * be in the cache.
 */
void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
{
}