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1000197d LFT |
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. */ | |
21 | asmlinkage 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 | ||
50 | asmlinkage int sys_getpagesize(void) | |
51 | { | |
52 | return PAGE_SIZE; | |
53 | } |