1/*
2 * Copyright (C) 2013 Altera Corporation
3 * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
4 * Copyright (C) 2004 Microtronix Datacom Ltd.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11#include <linux/export.h>
12#include <linux/file.h>
13#include <linux/fs.h>
14#include <linux/slab.h>
15#include <linux/syscalls.h>
16
17#include <asm/cacheflush.h>
18#include <asm/traps.h>
19
20/* sys_cacheflush -- flush the processor cache. */
21asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
22				unsigned int op)
23{
24	struct vm_area_struct *vma;
25
26	if (len == 0)
27		return 0;
28
29	/* We only support op 0 now, return error if op is non-zero.*/
30	if (op)
31		return -EINVAL;
32
33	/* Check for overflow */
34	if (addr + len < addr)
35		return -EFAULT;
36
37	/*
38	 * Verify that the specified address region actually belongs
39	 * to this process.
40	 */
41	vma = find_vma(current->mm, addr);
42	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
43		return -EFAULT;
44
45	flush_cache_range(vma, addr, addr + len);
46
47	return 0;
48}
49
50asmlinkage int sys_getpagesize(void)
51{
52	return PAGE_SIZE;
53}
54