From 6fca8abef7e6d7be1a9e6d93dd0f2b7fbc5b28e5 Mon Sep 17 00:00:00 2001 From: Pasha Date: Tue, 20 Feb 2024 18:55:36 +0000 Subject: initial risc-v example --- riscv/include/asm/current.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 riscv/include/asm/current.h (limited to 'riscv/include/asm/current.h') diff --git a/riscv/include/asm/current.h b/riscv/include/asm/current.h new file mode 100644 index 0000000..21774d8 --- /dev/null +++ b/riscv/include/asm/current.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Based on arm/arm64/include/asm/current.h + * + * Copyright (C) 2016 ARM + * Copyright (C) 2017 SiFive + */ + + +#ifndef _ASM_RISCV_CURRENT_H +#define _ASM_RISCV_CURRENT_H + +#include +#include + +#ifndef __ASSEMBLY__ + +struct task_struct; + +register struct task_struct *riscv_current_is_tp __asm__("tp"); + +/* + * This only works because "struct thread_info" is at offset 0 from "struct + * task_struct". This constraint seems to be necessary on other architectures + * as well, but __switch_to enforces it. We can't check TASK_TI here because + * includes this, and I can't get the definition of "struct + * task_struct" here due to some header ordering problems. + */ +static __always_inline struct task_struct *get_current(void) +{ + return riscv_current_is_tp; +} + +#define current get_current() + +register unsigned long current_stack_pointer __asm__("sp"); + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_RISCV_CURRENT_H */ -- cgit v1.2.1