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/*
* Copyright (C) 2013 Altera Corporation
* Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/export.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>
/* sys_cacheflush -- flush the processor cache. */
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
unsigned int op)
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
if (len == 0)
return 0;
/* We only support op 0 now, return error if op is non-zero.*/
if (op)
return -EINVAL;
/* Check for overflow */
if (addr + len < addr)
return -EFAULT;
if (mmap_read_lock_killable(mm))
return -EINTR;
/*
* Verify that the specified address region actually belongs
* to this process.
*/
vma = find_vma(mm, addr);
if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
mmap_read_unlock(mm);
return -EFAULT;
}
flush_cache_range(vma, addr, addr + len);
mmap_read_unlock(mm);
return 0;
}
asmlinkage int sys_getpagesize(void)
{
return PAGE_SIZE;
}
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