1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef UACCESS_H 3#define UACCESS_H 4 5#include <linux/compiler.h> 6 7extern void *__user_addr_min, *__user_addr_max; 8 9#define put_user(x, ptr) \ 10({ \ 11 typeof(ptr) __pu_ptr = (ptr); \ 12 __chk_user_ptr(__pu_ptr); \ 13 WRITE_ONCE(*(__pu_ptr), x); \ 14 0; \ 15}) 16 17#define get_user(x, ptr) \ 18({ \ 19 typeof(ptr) __pu_ptr = (ptr); \ 20 __chk_user_ptr(__pu_ptr); \ 21 x = READ_ONCE(*(__pu_ptr)); \ 22 0; \ 23}) 24 25static void volatile_memcpy(volatile char *to, const volatile char *from, 26 unsigned long n) 27{ 28 while (n--) 29 *(to++) = *(from++); 30} 31 32static inline int copy_from_user(void *to, const void __user volatile *from, 33 unsigned long n) 34{ 35 volatile_memcpy(to, from, n); 36 return 0; 37} 38 39static inline int copy_to_user(void __user volatile *to, const void *from, 40 unsigned long n) 41{ 42 volatile_memcpy(to, from, n); 43 return 0; 44} 45#endif /* UACCESS_H */ 46