cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

sys_nios2.c (1342B)

      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. */
     21asmlinkage 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
     57asmlinkage int sys_getpagesize(void)
     58{
     59	return PAGE_SIZE;
     60}