LXR linux/arch/riscv/include/asm/current.h

   1/*
   2 * Based on arm/arm64/include/asm/current.h
   3 *
   4 * Copyright (C) 2016 ARM
   5 * Copyright (C) 2017 SiFive
   6 *
   7 *   This program is free software; you can redistribute it and/or
   8 *   modify it under the terms of the GNU General Public License
   9 *   as published by the Free Software Foundation, version 2.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 */
  16
  17
  18#ifndef __ASM_CURRENT_H
  19#define __ASM_CURRENT_H
  20
  21#include <linux/bug.h>
  22#include <linux/compiler.h>
  23
  24#ifndef __ASSEMBLY__
  25
  26struct task_struct;
  27
  28/*
  29 * This only works because "struct thread_info" is at offset 0 from "struct
  30 * task_struct".  This constraint seems to be necessary on other architectures
  31 * as well, but __switch_to enforces it.  We can't check TASK_TI here because
  32 * <asm/asm-offsets.h> includes this, and I can't get the definition of "struct
  33 * task_struct" here due to some header ordering problems.
  34 */
  35static __always_inline struct task_struct *get_current(void)
  36{
  37        register struct task_struct *tp __asm__("tp");
  38        return tp;
  39}
  40
  41#define current get_current()
  42
  43#endif /* __ASSEMBLY__ */
  44
  45#endif /* __ASM_CURRENT_H */
  46