67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Optimized memory copy routines.
|
|
*
|
|
* Copyright (C) 2004 Randolph Chung <tausq@debian.org>
|
|
* Copyright (C) 2013-2017 Helge Deller <deller@gmx.de>
|
|
*
|
|
* Portions derived from the GNU C Library
|
|
* Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3))
|
|
#define get_kernel_space() (0)
|
|
|
|
/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
|
|
extern unsigned long pa_memcpy(void *dst, const void *src,
|
|
unsigned long len);
|
|
|
|
unsigned long raw_copy_to_user(void __user *dst, const void *src,
|
|
unsigned long len)
|
|
{
|
|
mtsp(get_kernel_space(), 1);
|
|
mtsp(get_user_space(), 2);
|
|
return pa_memcpy((void __force *)dst, src, len);
|
|
}
|
|
EXPORT_SYMBOL(raw_copy_to_user);
|
|
|
|
unsigned long raw_copy_from_user(void *dst, const void __user *src,
|
|
unsigned long len)
|
|
{
|
|
mtsp(get_user_space(), 1);
|
|
mtsp(get_kernel_space(), 2);
|
|
return pa_memcpy(dst, (void __force *)src, len);
|
|
}
|
|
EXPORT_SYMBOL(raw_copy_from_user);
|
|
|
|
unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len)
|
|
{
|
|
mtsp(get_user_space(), 1);
|
|
mtsp(get_user_space(), 2);
|
|
return pa_memcpy((void __force *)dst, (void __force *)src, len);
|
|
}
|
|
|
|
|
|
void * memcpy(void * dst,const void *src, size_t count)
|
|
{
|
|
mtsp(get_kernel_space(), 1);
|
|
mtsp(get_kernel_space(), 2);
|
|
pa_memcpy(dst, src, count);
|
|
return dst;
|
|
}
|
|
|
|
EXPORT_SYMBOL(raw_copy_in_user);
|
|
EXPORT_SYMBOL(memcpy);
|
|
|
|
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
|
|
{
|
|
if ((unsigned long)unsafe_src < PAGE_SIZE)
|
|
return false;
|
|
/* check for I/O space F_EXTEND(0xfff00000) access as well? */
|
|
return true;
|
|
}
|