1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Based on arm/arm64/include/asm/current.h 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2016 ARM 6*4882a593Smuzhiyun * Copyright (C) 2017 SiFive 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #ifndef _ASM_RISCV_CURRENT_H 11*4882a593Smuzhiyun #define _ASM_RISCV_CURRENT_H 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include <linux/bug.h> 14*4882a593Smuzhiyun #include <linux/compiler.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun struct task_struct; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun register struct task_struct *riscv_current_is_tp __asm__("tp"); 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun /* 23*4882a593Smuzhiyun * This only works because "struct thread_info" is at offset 0 from "struct 24*4882a593Smuzhiyun * task_struct". This constraint seems to be necessary on other architectures 25*4882a593Smuzhiyun * as well, but __switch_to enforces it. We can't check TASK_TI here because 26*4882a593Smuzhiyun * <asm/asm-offsets.h> includes this, and I can't get the definition of "struct 27*4882a593Smuzhiyun * task_struct" here due to some header ordering problems. 28*4882a593Smuzhiyun */ get_current(void)29*4882a593Smuzhiyunstatic __always_inline struct task_struct *get_current(void) 30*4882a593Smuzhiyun { 31*4882a593Smuzhiyun return riscv_current_is_tp; 32*4882a593Smuzhiyun } 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #define current get_current() 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */ 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun #endif /* _ASM_RISCV_CURRENT_H */ 39