LXR linux/arch/parisc/lib/memcpy.c

   1/*
   2 *    Optimized memory copy routines.
   3 *
   4 *    Copyright (C) 2004 Randolph Chung <tausq@debian.org>
   5 *    Copyright (C) 2013-2017 Helge Deller <deller@gmx.de>
   6 *
   7 *    This program is free software; you can redistribute it and/or modify
   8 *    it under the terms of the GNU General Public License as published by
   9 *    the Free Software Foundation; either version 2, or (at your option)
  10 *    any later version.
  11 *
  12 *    This program is distributed in the hope that it will be useful,
  13 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *    GNU General Public License for more details.
  16 *
  17 *    You should have received a copy of the GNU General Public License
  18 *    along with this program; if not, write to the Free Software
  19 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 *
  21 *    Portions derived from the GNU C Library
  22 *    Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
  23 *
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/compiler.h>
  28#include <linux/uaccess.h>
  29
  30#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3))
  31#define get_kernel_space() (0)
  32
  33/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
  34extern unsigned long pa_memcpy(void *dst, const void *src,
  35                                unsigned long len);
  36
  37unsigned long raw_copy_to_user(void __user *dst, const void *src,
  38                               unsigned long len)
  39{
  40        mtsp(get_kernel_space(), 1);
  41        mtsp(get_user_space(), 2);
  42        return pa_memcpy((void __force *)dst, src, len);
  43}
  44EXPORT_SYMBOL(raw_copy_to_user);
  45
  46unsigned long raw_copy_from_user(void *dst, const void __user *src,
  47                               unsigned long len)
  48{
  49        mtsp(get_user_space(), 1);
  50        mtsp(get_kernel_space(), 2);
  51        return pa_memcpy(dst, (void __force *)src, len);
  52}
  53EXPORT_SYMBOL(raw_copy_from_user);
  54
  55unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len)
  56{
  57        mtsp(get_user_space(), 1);
  58        mtsp(get_user_space(), 2);
  59        return pa_memcpy((void __force *)dst, (void __force *)src, len);
  60}
  61
  62
  63void * memcpy(void * dst,const void *src, size_t count)
  64{
  65        mtsp(get_kernel_space(), 1);
  66        mtsp(get_kernel_space(), 2);
  67        pa_memcpy(dst, src, count);
  68        return dst;
  69}
  70
  71EXPORT_SYMBOL(raw_copy_in_user);
  72EXPORT_SYMBOL(memcpy);
  73
  74long probe_kernel_read(void *dst, const void *src, size_t size)
  75{
  76        unsigned long addr = (unsigned long)src;
  77
  78        if (addr < PAGE_SIZE)
  79                return -EFAULT;
  80
  81        /* check for I/O space F_EXTEND(0xfff00000) access as well? */
  82
  83        return __probe_kernel_read(dst, src, size);
  84}
  85