thread_info.h 4.35 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
 *  arch/arm/include/asm/thread_info.h
Linus Torvalds's avatar
Linus Torvalds committed
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>
Linus Torvalds's avatar
Linus Torvalds committed
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)

Linus Torvalds's avatar
Linus Torvalds committed
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 */
Linus Torvalds's avatar
Linus Torvalds committed
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 */
Linus Torvalds's avatar
Linus Torvalds committed
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)));
Linus Torvalds's avatar
Linus Torvalds committed
64
	union vfp_state		vfpstate;
65
66
67
#ifdef CONFIG_ARM_THUMBEE
	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
#endif
Linus Torvalds's avatar
Linus Torvalds committed
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
	struct restart_block	restart_block;
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.exec_domain	= &default_exec_domain,				\
	.flags		= 0,						\
	.preempt_count	= 1,						\
	.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)	\
Russell King's avatar
Russell King committed
101
	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
Linus Torvalds's avatar
Linus Torvalds committed
102
#define thread_saved_fp(tsk)	\
Al Viro's avatar
Al Viro committed
103
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
Linus Torvalds's avatar
Linus Torvalds committed
104

105
106
107
108
109
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 *);

Linus Torvalds's avatar
Linus Torvalds committed
110
111
112
113
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 *);
114
extern void iwmmxt_task_switch(struct thread_info *);
Linus Torvalds's avatar
Linus Torvalds committed
115

116
117
extern void vfp_sync_state(struct thread_info *thread);

Linus Torvalds's avatar
Linus Torvalds committed
118
119
120
121
#endif

/*
 * We use bit 30 of the preempt_count to indicate that kernel
122
 * preemption is occurring.  See <asm/hardirq.h>.
Linus Torvalds's avatar
Linus Torvalds committed
123
124
125
126
127
128
129
130
131
132
133
 */
#define PREEMPT_ACTIVE	0x40000000

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE	- syscall trace active
 *  TIF_SIGPENDING	- signal pending
 *  TIF_NEED_RESCHED	- rescheduling necessary
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
134
135
#define TIF_SIGPENDING		0
#define TIF_NEED_RESCHED	1
Linus Torvalds's avatar
Linus Torvalds committed
136
137
138
139
#define TIF_SYSCALL_TRACE	8
#define TIF_POLLING_NRFLAG	16
#define TIF_USING_IWMMXT	17
#define TIF_MEMDIE		18
140
#define TIF_FREEZE		19
Linus Torvalds's avatar
Linus Torvalds committed
141
142
143
144
145
146

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
147
#define _TIF_FREEZE		(1 << TIF_FREEZE)
Linus Torvalds's avatar
Linus Torvalds committed
148
149
150
151
152
153
154
155

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

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