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Linux/arch/nios2/kernel/sys_nios2.c

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  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 }
 54 

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