[linux-2.6-block.git] / arch / riscv / include / asm / current.h

/*
 * Based on arm/arm64/include/asm/current.h
 *
 * Copyright (C) 2016 ARM
 * Copyright (C) 2017 SiFive
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 */


#ifndef __ASM_CURRENT_H
#define __ASM_CURRENT_H

#include <linux/bug.h>
#include <linux/compiler.h>

#ifndef __ASSEMBLY__

struct task_struct;

/*
 * 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
 * <asm/asm-offsets.h> 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)
{
	register struct task_struct *tp __asm__("tp");
	return tp;
}

#define current get_current()

#endif /* __ASSEMBLY__ */

#endif /* __ASM_CURRENT_H */
Commit	Line	Data
7db91e57 PD	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
	26	struct 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	*/
	35	static __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 */