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

/*
 *  arch/arm/include/asm/thread_info.h
 *
 *  Copyright (C) 2002 Russell King.
 *
 * 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.
 */
#ifndef __ASM_ARM_THREAD_INFO_H
#define __ASM_ARM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <asm/fpstate.h>
#include <asm/page.h>

#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_START_SP		(THREAD_SIZE - 8)

#ifndef __ASSEMBLY__

struct task_struct;

#include <asm/types.h>

typedef unsigned long mm_segment_t;

struct cpu_context_save {
	__u32	r4;
	__u32	r5;
	__u32	r6;
	__u32	r7;
	__u32	r8;
	__u32	r9;
	__u32	sl;
	__u32	fp;
	__u32	sp;
	__u32	pc;
	__u32	extra[2];		/* Xscale 'acc' register, etc */
};

/*
 * 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 */
	int			preempt_count;	/* 0 => preemptable, <0 => bug */
	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	__u32			cpu;		/* cpu */
	__u32			cpu_domain;	/* cpu domain */
	struct cpu_context_save	cpu_context;	/* cpu context */
	__u32			syscall;	/* syscall number */
	__u8			used_cp[16];	/* thread used copro */
	unsigned long		tp_value[2];	/* TLS registers */
#ifdef CONFIG_CRUNCH
	struct crunch_state	crunchstate;
#endif
	union fp_state		fpstate __attribute__((aligned(8)));
	union vfp_state		vfpstate;
#ifdef CONFIG_ARM_THUMBEE
	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
#endif
};

#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 in 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__;

static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *)
		(current_stack_pointer & ~(THREAD_SIZE - 1));
}

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

#ifndef CONFIG_THUMB2_KERNEL
#define thread_saved_fp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
#else
#define thread_saved_fp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
#endif

extern void crunch_task_disable(struct thread_info *);
extern void crunch_task_copy(struct thread_info *, void *);
extern void crunch_task_restore(struct thread_info *, void *);
extern void crunch_task_release(struct thread_info *);

extern void iwmmxt_task_disable(struct thread_info *);
extern void iwmmxt_task_copy(struct thread_info *, void *);
extern void iwmmxt_task_restore(struct thread_info *, void *);
extern void iwmmxt_task_release(struct thread_info *);
extern void iwmmxt_task_switch(struct thread_info *);

extern void vfp_sync_hwstate(struct thread_info *);
extern void vfp_flush_hwstate(struct thread_info *);

struct user_vfp;
struct user_vfp_exc;

extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
					   struct user_vfp_exc __user *);
extern int vfp_restore_user_hwstate(struct user_vfp __user *,
				    struct user_vfp_exc __user *);
#endif

/*
 * thread information flags:
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
#define TIF_SIGPENDING		0	/* signal pending */
#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
#define TIF_UPROBE		3	/* breakpointed or singlestepping */
#define TIF_SYSCALL_TRACE	4	/* syscall trace active */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
#define TIF_SECCOMP		7	/* seccomp syscall filtering active */

#define TIF_NOHZ		12	/* in adaptive nohz mode */
#define TIF_USING_IWMMXT	17
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK	20

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
#define _TIF_UPROBE		(1 << TIF_UPROBE)
#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_USING_IWMMXT	(1 << TIF_USING_IWMMXT)

/* Checks for any syscall work in entry-common.S */
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)

/*
 * Change these and you break ASM code in entry-common.S
 */
#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)

#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */
Commit	Line	Data
1da177e4	1	/*
4baa9922	2	* arch/arm/include/asm/thread_info.h
1da177e4 LT	3	*
	4	* Copyright (C) 2002 Russell King.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#ifndef __ASM_ARM_THREAD_INFO_H
	11	#define __ASM_ARM_THREAD_INFO_H
	12
	13	#ifdef __KERNEL__
	14
8dc39b88	15	#include <linux/compiler.h>
1da177e4	16	#include <asm/fpstate.h>
9a2b51b6	17	#include <asm/page.h>
1da177e4	18
4f7a1812	19	#define THREAD_SIZE_ORDER 1
9a2b51b6	20	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
4f7a1812 RK	21	#define THREAD_START_SP (THREAD_SIZE - 8)
4f7a1812 RK	22
1da177e4 LT	23	#ifndef __ASSEMBLY__
	24
	25	struct task_struct;
1da177e4	26
1da177e4	27	#include <asm/types.h>
1da177e4 LT	28
	29	typedef unsigned long mm_segment_t;
	30
	31	struct cpu_context_save {
	32	__u32 r4;
	33	__u32 r5;
	34	__u32 r6;
	35	__u32 r7;
	36	__u32 r8;
	37	__u32 r9;
	38	__u32 sl;
	39	__u32 fp;
	40	__u32 sp;
	41	__u32 pc;
	42	__u32 extra[2]; /* Xscale 'acc' register, etc */
	43	};
	44
	45	/*
	46	* low level task data that entry.S needs immediate access to.
	47	* __switch_to() assumes cpu_context follows immediately after cpu_domain.
	48	*/
	49	struct thread_info {
	50	unsigned long flags; /* low level flags */
dcd497f9	51	int preempt_count; /* 0 => preemptable, <0 => bug */
1da177e4 LT	52	mm_segment_t addr_limit; /* address limit */
1da177e4 LT	53	struct task_struct task; / main task structure */
1da177e4 LT	54	__u32 cpu; /* cpu */
	55	__u32 cpu_domain; /* cpu domain */
	56	struct cpu_context_save cpu_context; /* cpu context */
5ba6d3fe	57	__u32 syscall; /* syscall number */
1da177e4	58	__u8 used_cp[16]; /* thread used copro */
a4780ade	59	unsigned long tp_value[2]; /* TLS registers */
9fc31ddc	60	#ifdef CONFIG_CRUNCH
c17fad11	61	struct crunch_state crunchstate;
9fc31ddc	62	#endif
cdaabbd7	63	union fp_state fpstate __attribute__((aligned(8)));
1da177e4	64	union vfp_state vfpstate;
d7f864be CM	65	#ifdef CONFIG_ARM_THUMBEE
	66	unsigned long thumbee_state; /* ThumbEE Handler Base register */
	67	#endif
1da177e4 LT	68	};
	69
	70	#define INIT_THREAD_INFO(tsk) \
	71	{ \
	72	.task = &tsk, \
1da177e4	73	.flags = 0, \
c99e6efe	74	.preempt_count = INIT_PREEMPT_COUNT, \
1da177e4	75	.addr_limit = KERNEL_DS, \
1da177e4 LT	76	}
	77
	78	#define init_thread_info (init_thread_union.thread_info)
	79	#define init_stack (init_thread_union.stack)
	80
0abc08ba BW	81	/*
	82	* how to get the current stack pointer in C
	83	*/
	84	register unsigned long current_stack_pointer asm ("sp");
	85
1da177e4 LT	86	/*
	87	* how to get the thread information struct from C
	88	*/
	89	static inline struct thread_info *current_thread_info(void) __attribute_const__;
	90
	91	static inline struct thread_info *current_thread_info(void)
	92	{
f6c9cbf0 BW	93	return (struct thread_info *)
f6c9cbf0 BW	94	(current_stack_pointer & ~(THREAD_SIZE - 1));
1da177e4 LT	95	}
1da177e4 LT	96
1da177e4	97	#define thread_saved_pc(tsk) \
1de765c1	98	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
2d7c11bf CM	99	#define thread_saved_sp(tsk) \
2d7c11bf CM	100	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
870cbe8c NB	101
870cbe8c NB	102	#ifndef CONFIG_THUMB2_KERNEL
1da177e4	103	#define thread_saved_fp(tsk) \
e7c1b32f	104	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
870cbe8c NB	105	#else
	106	#define thread_saved_fp(tsk) \
	107	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
	108	#endif
1da177e4	109
c17fad11 LB	110	extern void crunch_task_disable(struct thread_info *);
	111	extern void crunch_task_copy(struct thread_info , void );
	112	extern void crunch_task_restore(struct thread_info , void );
	113	extern void crunch_task_release(struct thread_info *);
	114
1da177e4 LT	115	extern void iwmmxt_task_disable(struct thread_info *);
	116	extern void iwmmxt_task_copy(struct thread_info , void );
	117	extern void iwmmxt_task_restore(struct thread_info , void );
	118	extern void iwmmxt_task_release(struct thread_info *);
ae95bfbb	119	extern void iwmmxt_task_switch(struct thread_info *);
1da177e4	120
ad187f95 RK	121	extern void vfp_sync_hwstate(struct thread_info *);
ad187f95 RK	122	extern void vfp_flush_hwstate(struct thread_info *);
3d1228ea	123
2498814f WD	124	struct user_vfp;
	125	struct user_vfp_exc;
	126
	127	extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
	128	struct user_vfp_exc __user *);
	129	extern int vfp_restore_user_hwstate(struct user_vfp __user *,
	130	struct user_vfp_exc __user *);
1da177e4 LT	131	#endif
1da177e4 LT	132
1da177e4 LT	133	/*
1da177e4 LT	134	* thread information flags:
1da177e4 LT	135	* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
	136	* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
	137	*/
3302cadd RK	138	#define TIF_SIGPENDING 0 /* signal pending */
3302cadd RK	139	#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
d0420c83	140	#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
3302cadd RK	141	#define TIF_UPROBE 3 /* breakpointed or singlestepping */
	142	#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
	143	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
	144	#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
	145	#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
	146
b0088480	147	#define TIF_NOHZ 12 /* in adaptive nohz mode */
1da177e4	148	#define TIF_USING_IWMMXT 17
0ddc9324	149	#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
36984265	150	#define TIF_RESTORE_SIGMASK 20
1da177e4	151
1da177e4 LT	152	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
1da177e4 LT	153	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
d0420c83	154	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
c7edc9e3	155	#define _TIF_UPROBE (1 << TIF_UPROBE)
1da177e4	156	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
29ef73b7	157	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
1f66e06f	158	#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
70c70d97	159	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
9b790d71	160	#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
1da177e4	161
29ef73b7	162	/* Checks for any syscall work in entry-common.S */
9b790d71 KC	163	#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
9b790d71 KC	164	_TIF_SYSCALL_TRACEPOINT \| _TIF_SECCOMP)
29ef73b7	165
1da177e4 LT	166	/*
	167	* Change these and you break ASM code in entry-common.S
	168	*/
c7edc9e3 DL	169	#define _TIF_WORK_MASK (_TIF_NEED_RESCHED \| _TIF_SIGPENDING \| \
c7edc9e3 DL	170	_TIF_NOTIFY_RESUME \| _TIF_UPROBE)
1da177e4 LT	171
	172	#endif /* __KERNEL__ */
	173	#endif /* __ASM_ARM_THREAD_INFO_H */