| Ley Foon Tan | 1000197 | 2014-11-06 15:19:57 +0800 | [diff] [blame] | 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 | } |