tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
30DECLARE_PER_CPU(struct exception_data, exception_data);
31
32#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3))
33#define get_kernel_space() (0)
34
35/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
36extern unsigned long pa_memcpy(void *dst, const void *src,
37 unsigned long len);
38
39unsigned long raw_copy_to_user(void __user *dst, const void *src,
40 unsigned long len)
41{
42 mtsp(get_kernel_space(), 1);
43 mtsp(get_user_space(), 2);
44 return pa_memcpy((void __force *)dst, src, len);
45}
46EXPORT_SYMBOL(raw_copy_to_user);
47
48unsigned long raw_copy_from_user(void *dst, const void __user *src,
49 unsigned long len)
50{
51 mtsp(get_user_space(), 1);
52 mtsp(get_kernel_space(), 2);
53 return pa_memcpy(dst, (void __force *)src, len);
54}
55EXPORT_SYMBOL(raw_copy_from_user);
56
57unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len)
58{
59 mtsp(get_user_space(), 1);
60 mtsp(get_user_space(), 2);
61 return pa_memcpy((void __force *)dst, (void __force *)src, len);
62}
63
64
65void * memcpy(void * dst,const void *src, size_t count)
66{
67 mtsp(get_kernel_space(), 1);
68 mtsp(get_kernel_space(), 2);
69 pa_memcpy(dst, src, count);
70 return dst;
71}
72
73EXPORT_SYMBOL(raw_copy_in_user);
74EXPORT_SYMBOL(memcpy);
75
76long probe_kernel_read(void *dst, const void *src, size_t size)
77{
78 unsigned long addr = (unsigned long)src;
79
80 if (addr < PAGE_SIZE)
81 return -EFAULT;
82
83 /* check for I/O space F_EXTEND(0xfff00000) access as well? */
84
85 return __probe_kernel_read(dst, src, size);
86}