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
  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  */
  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 */