[deliverable/linux.git] / arch / arm64 / include / asm / thread_info.h

/*
 * Based on arch/arm/include/asm/thread_info.h
 *
 * Copyright (C) 2002 Russell King.
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_THREAD_INFO_H
#define __ASM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>

#ifdef CONFIG_ARM64_4K_PAGES
#define THREAD_SIZE_ORDER	2
#elif defined(CONFIG_ARM64_16K_PAGES)
#define THREAD_SIZE_ORDER	0
#endif

#define THREAD_SIZE		16384
#define THREAD_START_SP		(THREAD_SIZE - 16)

#ifndef __ASSEMBLY__

struct task_struct;

#include <asm/types.h>

typedef unsigned long mm_segment_t;

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
	unsigned long		flags;		/* low level flags */
	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	int			preempt_count;	/* 0 => preemptable, <0 => bug */
	int			cpu;		/* cpu */
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.flags		= 0,						\
	.preempt_count	= INIT_PREEMPT_COUNT,				\
	.addr_limit	= KERNEL_DS,					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/*
 * how to get the current stack pointer from C
 */
register unsigned long current_stack_pointer asm ("sp");

/*
 * how to get the thread information struct from C
 */
static inline struct thread_info *current_thread_info(void) __attribute_const__;

/*
 * struct thread_info can be accessed directly via sp_el0.
 *
 * We don't use read_sysreg() as we want the compiler to cache the value where
 * possible.
 */
static inline struct thread_info *current_thread_info(void)
{
	unsigned long sp_el0;

	asm ("mrs %0, sp_el0" : "=r" (sp_el0));

	return (struct thread_info *)sp_el0;
}

#define thread_saved_pc(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.pc))
#define thread_saved_sp(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.sp))
#define thread_saved_fp(tsk)	\
	((unsigned long)(tsk->thread.cpu_context.fp))

#endif

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE	- syscall trace active
 *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
 *  TIF_SYSCALL_AUDIT	- syscall auditing
 *  TIF_SECOMP		- syscall secure computing
 *  TIF_SIGPENDING	- signal pending
 *  TIF_NEED_RESCHED	- rescheduling necessary
 *  TIF_NOTIFY_RESUME	- callback before returning to user
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 */
#define TIF_SIGPENDING		0
#define TIF_NEED_RESCHED	1
#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
#define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
#define TIF_NOHZ		7
#define TIF_SYSCALL_TRACE	8
#define TIF_SYSCALL_AUDIT	9
#define TIF_SYSCALL_TRACEPOINT	10
#define TIF_SECCOMP		11
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
#define TIF_FREEZE		19
#define TIF_RESTORE_SIGMASK	20
#define TIF_SINGLESTEP		21
#define TIF_32BIT		22	/* 32bit process */

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
#define _TIF_NOHZ		(1 << TIF_NOHZ)
#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
#define _TIF_32BIT		(1 << TIF_32BIT)

#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)

#define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
				 _TIF_NOHZ)

#endif /* __KERNEL__ */
#endif /* __ASM_THREAD_INFO_H */
Commit	Line	Data
b3901d54 CM	1	/*
	2	* Based on arch/arm/include/asm/thread_info.h
	3	*
	4	* Copyright (C) 2002 Russell King.
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	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	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19	#ifndef __ASM_THREAD_INFO_H
	20	#define __ASM_THREAD_INFO_H
	21
	22	#ifdef __KERNEL__
	23
	24	#include <linux/compiler.h>
	25
755e70b7	26	#ifdef CONFIG_ARM64_4K_PAGES
845ad05e	27	#define THREAD_SIZE_ORDER 2
44eaacf1 SP	28	#elif defined(CONFIG_ARM64_16K_PAGES)
44eaacf1 SP	29	#define THREAD_SIZE_ORDER 0
b3901d54 CM	30	#endif
b3901d54 CM	31
845ad05e	32	#define THREAD_SIZE 16384
b3901d54 CM	33	#define THREAD_START_SP (THREAD_SIZE - 16)
	34
	35	#ifndef __ASSEMBLY__
	36
	37	struct task_struct;
b3901d54 CM	38
	39	#include <asm/types.h>
	40
	41	typedef unsigned long mm_segment_t;
	42
	43	/*
	44	* low level task data that entry.S needs immediate access to.
	45	* __switch_to() assumes cpu_context follows immediately after cpu_domain.
	46	*/
	47	struct thread_info {
	48	unsigned long flags; /* low level flags */
	49	mm_segment_t addr_limit; /* address limit */
	50	struct task_struct task; / main task structure */
b3901d54 CM	51	int preempt_count; /* 0 => preemptable, <0 => bug */
	52	int cpu; /* cpu */
	53	};
	54
	55	#define INIT_THREAD_INFO(tsk) \
	56	{ \
	57	.task = &tsk, \
b3901d54 CM	58	.flags = 0, \
	59	.preempt_count = INIT_PREEMPT_COUNT, \
	60	.addr_limit = KERNEL_DS, \
b3901d54 CM	61	}
	62
	63	#define init_thread_info (init_thread_union.thread_info)
	64	#define init_stack (init_thread_union.stack)
	65
3337a10e BW	66	/*
	67	* how to get the current stack pointer from C
	68	*/
	69	register unsigned long current_stack_pointer asm ("sp");
	70
b3901d54 CM	71	/*
	72	* how to get the thread information struct from C
	73	*/
	74	static inline struct thread_info *current_thread_info(void) __attribute_const__;
	75
6cdf9c7c JL	76	/*
6cdf9c7c JL	77	* struct thread_info can be accessed directly via sp_el0.
adf75899 MR	78	*
	79	* We don't use read_sysreg() as we want the compiler to cache the value where
	80	* possible.
6cdf9c7c	81	*/
b3901d54 CM	82	static inline struct thread_info *current_thread_info(void)
b3901d54 CM	83	{
6cdf9c7c JL	84	unsigned long sp_el0;
	85
	86	asm ("mrs %0, sp_el0" : "=r" (sp_el0));
	87
	88	return (struct thread_info *)sp_el0;
b3901d54 CM	89	}
	90
	91	#define thread_saved_pc(tsk) \
	92	((unsigned long)(tsk->thread.cpu_context.pc))
	93	#define thread_saved_sp(tsk) \
	94	((unsigned long)(tsk->thread.cpu_context.sp))
	95	#define thread_saved_fp(tsk) \
	96	((unsigned long)(tsk->thread.cpu_context.fp))
	97
	98	#endif
	99
b3901d54 CM	100	/*
	101	* thread information flags:
	102	* TIF_SYSCALL_TRACE - syscall trace active
449f81a4 AT	103	* TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
	104	* TIF_SYSCALL_AUDIT - syscall auditing
	105	* TIF_SECOMP - syscall secure computing
b3901d54 CM	106	* TIF_SIGPENDING - signal pending
	107	* TIF_NEED_RESCHED - rescheduling necessary
	108	* TIF_NOTIFY_RESUME - callback before returning to user
	109	* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
b3901d54 CM	110	*/
	111	#define TIF_SIGPENDING 0
	112	#define TIF_NEED_RESCHED 1
	113	#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
005f78cd	114	#define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */
6c81fe79	115	#define TIF_NOHZ 7
b3901d54	116	#define TIF_SYSCALL_TRACE 8
449f81a4 AT	117	#define TIF_SYSCALL_AUDIT 9
	118	#define TIF_SYSCALL_TRACEPOINT 10
	119	#define TIF_SECCOMP 11
b3901d54 CM	120	#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
	121	#define TIF_FREEZE 19
	122	#define TIF_RESTORE_SIGMASK 20
	123	#define TIF_SINGLESTEP 21
	124	#define TIF_32BIT 22 /* 32bit process */
b3901d54 CM	125
	126	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	127	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	128	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
005f78cd	129	#define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE)
6c81fe79	130	#define _TIF_NOHZ (1 << TIF_NOHZ)
449f81a4 AT	131	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	132	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
	133	#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
	134	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
b3901d54 CM	135	#define _TIF_32BIT (1 << TIF_32BIT)
	136
	137	#define _TIF_WORK_MASK (_TIF_NEED_RESCHED \| _TIF_SIGPENDING \| \
005f78cd	138	_TIF_NOTIFY_RESUME \| _TIF_FOREIGN_FPSTATE)
b3901d54	139
449f81a4	140	#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
6c81fe79 LB	141	_TIF_SYSCALL_TRACEPOINT \| _TIF_SECCOMP \| \
6c81fe79 LB	142	_TIF_NOHZ)
b3901d54 CM	143
	144	#endif /* __KERNEL__ */
	145	#endif /* __ASM_THREAD_INFO_H */