1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Based on arm/arm64/include/asm/current.h
4  *
5  * Copyright (C) 2016 ARM
6  * Copyright (C) 2017 SiFive
7  */
8 
9 
10 #ifndef _ASM_RISCV_CURRENT_H
11 #define _ASM_RISCV_CURRENT_H
12 
13 #include <linux/bug.h>
14 #include <linux/compiler.h>
15 
16 #ifndef __ASSEMBLY__
17 
18 struct task_struct;
19 
20 register struct task_struct *riscv_current_is_tp __asm__("tp");
21 
22 /*
23  * This only works because "struct thread_info" is at offset 0 from "struct
24  * task_struct".  This constraint seems to be necessary on other architectures
25  * as well, but __switch_to enforces it.  We can't check TASK_TI here because
26  * <asm/asm-offsets.h> includes this, and I can't get the definition of "struct
27  * task_struct" here due to some header ordering problems.
28  */
get_current(void)29 static __always_inline struct task_struct *get_current(void)
30 {
31 	return riscv_current_is_tp;
32 }
33 
34 #define current get_current()
35 
36 register unsigned long current_stack_pointer __asm__("sp");
37 
38 #endif /* __ASSEMBLY__ */
39 
40 #endif /* _ASM_RISCV_CURRENT_H */
41