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}

 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	struct mm_struct *mm = current->mm;
26
27	if (len == 0)
28		return 0;
29
30	/* We only support op 0 now, return error if op is non-zero.*/
31	if (op)
32		return -EINVAL;
33
34	/* Check for overflow */
35	if (addr + len < addr)
36		return -EFAULT;
37
38	if (mmap_read_lock_killable(mm))
39		return -EINTR;
40
41	/*
42	 * Verify that the specified address region actually belongs
43	 * to this process.
44	 */
45	vma = find_vma(mm, addr);
46	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
47		mmap_read_unlock(mm);
48		return -EFAULT;
49	}
50
51	flush_cache_range(vma, addr, addr + len);
52
53	mmap_read_unlock(mm);
54	return 0;
55}
56
57asmlinkage int sys_getpagesize(void)
58{
59	return PAGE_SIZE;
60}