current.h

 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 __ASSEMBLER__
17
18struct task_struct;
19
20register 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 */
29static __always_inline struct task_struct *get_current(void)
30{
31	return riscv_current_is_tp;
32}
33
34#define current get_current()
35
36register unsigned long current_stack_pointer __asm__("sp");
37
38#endif /* __ASSEMBLER__ */
39
40#endif /* _ASM_RISCV_CURRENT_H */