| 1 | |
| 2 | * Copyright (C) 2013 Altera Corporation
|
| 3 | * Copyright (C) 2011-2012 Tobias Klauser <[email protected]>
|
| 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 |
|
| 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 |
|
| 31 | if (op)
|
| 32 | return -EINVAL;
|
| 33 |
|
| 34 |
|
| 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 |
|
| 57 | asmlinkage int sys_getpagesize(void)
|
| 58 | {
|
| 59 | return PAGE_SIZE;
|
| 60 | }
|