1 /* 2 * Based on arm/arm64/include/asm/current.h 3 * 4 * Copyright (C) 2016 ARM 5 * Copyright (C) 2017 SiFive 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation, version 2. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 18 #ifndef __ASM_CURRENT_H 19 #define __ASM_CURRENT_H 20 21 #include <linux/bug.h> 22 #include <linux/compiler.h> 23 24 #ifndef __ASSEMBLY__ 25 26 struct task_struct; 27 28 /* 29 * This only works because "struct thread_info" is at offset 0 from "struct 30 * task_struct". This constraint seems to be necessary on other architectures 31 * as well, but __switch_to enforces it. We can't check TASK_TI here because 32 * <asm/asm-offsets.h> includes this, and I can't get the definition of "struct 33 * task_struct" here due to some header ordering problems. 34 */ 35 static __always_inline struct task_struct *get_current(void) 36 { 37 register struct task_struct *tp __asm__("tp"); 38 return tp; 39 } 40 41 #define current get_current() 42 43 #endif /* __ASSEMBLY__ */ 44 45 #endif /* __ASM_CURRENT_H */ 46