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. */
sys_cacheflush(unsigned long addr,unsigned long len,unsigned int op)21 asmlinkage 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 
sys_getpagesize(void)57 asmlinkage int sys_getpagesize(void)
58 {
59 	return PAGE_SIZE;
60 }
61