LXR linux/arch/riscv/include/asm/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 __ASSEMBLY__
  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
  36#endif /* __ASSEMBLY__ */
  37
  38#endif /* _ASM_RISCV_CURRENT_H */
  39