87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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/*
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* Optimized memory copy routines.
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*
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* Copyright (C) 2004 Randolph Chung <tausq@debian.org>
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* Copyright (C) 2013-2017 Helge Deller <deller@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Portions derived from the GNU C Library
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* Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc.
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*
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*/
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#include <linux/module.h>
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#include <linux/compiler.h>
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#include <linux/uaccess.h>
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DECLARE_PER_CPU(struct exception_data, exception_data);
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#define get_user_space() (segment_eq(get_fs(), KERNEL_DS) ? 0 : mfsp(3))
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#define get_kernel_space() (0)
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/* Returns 0 for success, otherwise, returns number of bytes not transferred. */
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extern unsigned long pa_memcpy(void *dst, const void *src,
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unsigned long len);
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unsigned long __copy_to_user(void __user *dst, const void *src,
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unsigned long len)
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{
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mtsp(get_kernel_space(), 1);
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mtsp(get_user_space(), 2);
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return pa_memcpy((void __force *)dst, src, len);
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}
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EXPORT_SYMBOL(__copy_to_user);
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unsigned long __copy_from_user(void *dst, const void __user *src,
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unsigned long len)
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{
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mtsp(get_user_space(), 1);
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mtsp(get_kernel_space(), 2);
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return pa_memcpy(dst, (void __force *)src, len);
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}
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EXPORT_SYMBOL(__copy_from_user);
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unsigned long copy_in_user(void __user *dst, const void __user *src, unsigned long len)
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{
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mtsp(get_user_space(), 1);
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mtsp(get_user_space(), 2);
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return pa_memcpy((void __force *)dst, (void __force *)src, len);
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}
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void * memcpy(void * dst,const void *src, size_t count)
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{
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mtsp(get_kernel_space(), 1);
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mtsp(get_kernel_space(), 2);
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pa_memcpy(dst, src, count);
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return dst;
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}
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EXPORT_SYMBOL(copy_in_user);
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EXPORT_SYMBOL(memcpy);
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long probe_kernel_read(void *dst, const void *src, size_t size)
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{
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unsigned long addr = (unsigned long)src;
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if (addr < PAGE_SIZE)
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return -EFAULT;
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/* check for I/O space F_EXTEND(0xfff00000) access as well? */
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return __probe_kernel_read(dst, src, size);
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}
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