From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/parisc/lib/memcpy.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 arch/parisc/lib/memcpy.c (limited to 'arch/parisc/lib/memcpy.c') diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c new file mode 100644 index 000000000..5fc0c852c --- /dev/null +++ b/arch/parisc/lib/memcpy.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Optimized memory copy routines. + * + * Copyright (C) 2004 Randolph Chung + * Copyright (C) 2013-2017 Helge Deller + * + * Portions derived from the GNU C Library + * Copyright (C) 1991, 1997, 2003 Free Software Foundation, Inc. + */ + +#include +#include +#include + +#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; +} -- cgit v1.2.3