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. */
  34 extern unsigned long pa_memcpy(void *dst, const void *src,
  35                                 unsigned long len);
  36
  37 unsigned 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 }
  44 EXPORT_SYMBOL(raw_copy_to_user);
  45
  46 unsigned 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 }
  53 EXPORT_SYMBOL(raw_copy_from_user);
  54
  55 unsigned 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
  63 void * 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
  71 EXPORT_SYMBOL(raw_copy_in_user);
  72 EXPORT_SYMBOL(memcpy);
  73
  74 long 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 }