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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Optimized memory copy routines.
- *
- * Copyright (C) 2004 Randolph Chung <[email protected]>
- * Copyright (C) 2013-2017 Helge Deller <[email protected]>
- *
- * 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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