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// 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() mfsp(SR_USER)
#define get_kernel_space() SR_KERNEL
/* 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(), SR_TEMP1);
mtsp(get_user_space(), SR_TEMP2);
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(), SR_TEMP1);
mtsp(get_kernel_space(), SR_TEMP2);
return pa_memcpy(dst, (void __force *)src, len);
}
EXPORT_SYMBOL(raw_copy_from_user);
void * memcpy(void * dst,const void *src, size_t count)
{
mtsp(get_kernel_space(), SR_TEMP1);
mtsp(get_kernel_space(), SR_TEMP2);
pa_memcpy(dst, src, count);
return dst;
}
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;
}
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