projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |