Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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* 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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#include <linux/module.h>
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#include <linux/compiler.h>
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#include <linux/uaccess.h>
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#include <linux/mm.h>
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#define get_user_space() mfsp(SR_USER)
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#define get_kernel_space() SR_KERNEL
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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 raw_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(), SR_TEMP1);
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mtsp(get_user_space(), SR_TEMP2);
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return pa_memcpy((void __force *)dst, src, len);
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}
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EXPORT_SYMBOL(raw_copy_to_user);
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unsigned long raw_copy_from_user(void *dst, const void __user *src,
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unsigned long len)
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{
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unsigned long start = (unsigned long) src;
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unsigned long end = start + len;
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unsigned long newlen = len;
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mtsp(get_user_space(), SR_TEMP1);
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mtsp(get_kernel_space(), SR_TEMP2);
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/* Check region is user accessible */
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while (start < end) {
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if (!prober_user(SR_TEMP1, start)) {
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newlen = (start - (unsigned long) src);
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break;
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}
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start += PAGE_SIZE;
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/* align to page boundry which may have different permission */
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start = PAGE_ALIGN_DOWN(start);
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}
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return len - newlen + pa_memcpy(dst, (void __force *)src, newlen);
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}
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EXPORT_SYMBOL(raw_copy_from_user);
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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(), SR_TEMP1);
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mtsp(get_kernel_space(), SR_TEMP2);
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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(memcpy);
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bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
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{
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if ((unsigned long)unsafe_src < PAGE_SIZE)
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return false;
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/* check for I/O space F_EXTEND(0xfff00000) access as well? */
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return true;
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}
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