thread_info.h 4.7 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
2
 *  arch/arm/include/asm/thread_info.h
L
Linus Torvalds 已提交
3 4 5 6 7 8 9 10 11 12 13 14
 *
 *  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__

15
#include <linux/compiler.h>
L
Linus Torvalds 已提交
16 17
#include <asm/fpstate.h>

18 19 20 21
#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		8192
#define THREAD_START_SP		(THREAD_SIZE - 8)

L
Linus Torvalds 已提交
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
#ifndef __ASSEMBLY__

struct task_struct;
struct exec_domain;

#include <asm/types.h>
#include <asm/domain.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 */
52
	int			preempt_count;	/* 0 => preemptable, <0 => bug */
L
Linus Torvalds 已提交
53 54 55 56 57 58
	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	__u32			cpu;		/* cpu */
	__u32			cpu_domain;	/* cpu domain */
	struct cpu_context_save	cpu_context;	/* cpu context */
59
	__u32			syscall;	/* syscall number */
L
Linus Torvalds 已提交
60 61
	__u8			used_cp[16];	/* thread used copro */
	unsigned long		tp_value;
62
	struct crunch_state	crunchstate;
63
	union fp_state		fpstate __attribute__((aligned(8)));
L
Linus Torvalds 已提交
64
	union vfp_state		vfpstate;
65 66 67
#ifdef CONFIG_ARM_THUMBEE
	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
#endif
L
Linus Torvalds 已提交
68 69 70 71 72 73 74 75
	struct restart_block	restart_block;
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.exec_domain	= &default_exec_domain,				\
	.flags		= 0,						\
P
Peter Zijlstra 已提交
76
	.preempt_count	= INIT_PREEMPT_COUNT,				\
L
Linus Torvalds 已提交
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
	.addr_limit	= KERNEL_DS,					\
	.cpu_domain	= domain_val(DOMAIN_USER, DOMAIN_MANAGER) |	\
			  domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |	\
			  domain_val(DOMAIN_IO, DOMAIN_CLIENT),		\
	.restart_block	= {						\
		.fn	= do_no_restart_syscall,			\
	},								\
}

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

/*
 * 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)
{
	register unsigned long sp asm ("sp");
	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
}

#define thread_saved_pc(tsk)	\
R
Russell King 已提交
101
	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
102 103
#define thread_saved_sp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
L
Linus Torvalds 已提交
104
#define thread_saved_fp(tsk)	\
A
Al Viro 已提交
105
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
L
Linus Torvalds 已提交
106

107 108 109 110 111
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 *);

L
Linus Torvalds 已提交
112 113 114 115
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 *);
116
extern void iwmmxt_task_switch(struct thread_info *);
L
Linus Torvalds 已提交
117

118 119
extern void vfp_sync_state(struct thread_info *thread);

L
Linus Torvalds 已提交
120 121 122 123
#endif

/*
 * We use bit 30 of the preempt_count to indicate that kernel
124
 * preemption is occurring.  See <asm/hardirq.h>.
L
Linus Torvalds 已提交
125 126 127 128 129 130 131 132
 */
#define PREEMPT_ACTIVE	0x40000000

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE	- syscall trace active
 *  TIF_SIGPENDING	- signal pending
 *  TIF_NEED_RESCHED	- rescheduling necessary
133
 *  TIF_NOTIFY_RESUME	- callback before returning to user
L
Linus Torvalds 已提交
134 135 136
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
137 138
#define TIF_SIGPENDING		0
#define TIF_NEED_RESCHED	1
139
#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
L
Linus Torvalds 已提交
140 141 142 143
#define TIF_SYSCALL_TRACE	8
#define TIF_POLLING_NRFLAG	16
#define TIF_USING_IWMMXT	17
#define TIF_MEMDIE		18
144
#define TIF_FREEZE		19
145
#define TIF_RESTORE_SIGMASK	20
L
Linus Torvalds 已提交
146 147 148

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
149
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
L
Linus Torvalds 已提交
150 151 152
#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
153
#define _TIF_FREEZE		(1 << TIF_FREEZE)
154
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
L
Linus Torvalds 已提交
155 156 157 158 159 160 161 162

/*
 * Change these and you break ASM code in entry-common.S
 */
#define _TIF_WORK_MASK		0x000000ff

#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */