1/*
2 *  linux/include/asm-arm/thread_info.h
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
15#include <linux/compiler.h>
16#include <asm/fpstate.h>
17
18#define THREAD_SIZE_ORDER	1
19#define THREAD_SIZE		8192
20#define THREAD_START_SP		(THREAD_SIZE - 8)
21
22#ifndef __ASSEMBLY__
23
24struct task_struct;
25struct exec_domain;
26
27#include <asm/ptrace.h>
28#include <asm/types.h>
29#include <asm/domain.h>
30
31typedef unsigned long mm_segment_t;
32
33struct cpu_context_save {
34	__u32	r4;
35	__u32	r5;
36	__u32	r6;
37	__u32	r7;
38	__u32	r8;
39	__u32	r9;
40	__u32	sl;
41	__u32	fp;
42	__u32	sp;
43	__u32	pc;
44	__u32	extra[2];		/* Xscale 'acc' register, etc */
45};
46
47/*
48 * low level task data that entry.S needs immediate access to.
49 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
50 */
51struct thread_info {
52	unsigned long		flags;		/* low level flags */
53	int			preempt_count;	/* 0 => preemptable, <0 => bug */
54	mm_segment_t		addr_limit;	/* address limit */
55	struct task_struct	*task;		/* main task structure */
56	struct exec_domain	*exec_domain;	/* execution domain */
57	__u32			cpu;		/* cpu */
58	__u32			cpu_domain;	/* cpu domain */
59	struct cpu_context_save	cpu_context;	/* cpu context */
60	__u32			syscall;	/* syscall number */
61	__u8			used_cp[16];	/* thread used copro */
62	unsigned long		tp_value;
63	struct crunch_state	crunchstate;
64	union fp_state		fpstate __attribute__((aligned(8)));
65	union vfp_state		vfpstate;
66	struct restart_block	restart_block;
67};
68
69#define INIT_THREAD_INFO(tsk)						\
70{									\
71	.task		= &tsk,						\
72	.exec_domain	= &default_exec_domain,				\
73	.flags		= 0,						\
74	.preempt_count	= 1,						\
75	.addr_limit	= KERNEL_DS,					\
76	.cpu_domain	= domain_val(DOMAIN_USER, DOMAIN_MANAGER) |	\
77			  domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |	\
78			  domain_val(DOMAIN_IO, DOMAIN_CLIENT),		\
79	.restart_block	= {						\
80		.fn	= do_no_restart_syscall,			\
81	},								\
82}
83
84#define init_thread_info	(init_thread_union.thread_info)
85#define init_stack		(init_thread_union.stack)
86
87/*
88 * how to get the thread information struct from C
89 */
90static inline struct thread_info *current_thread_info(void) __attribute_const__;
91
92static inline struct thread_info *current_thread_info(void)
93{
94	register unsigned long sp asm ("sp");
95	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
96}
97
98/* thread information allocation */
99#ifdef CONFIG_DEBUG_STACK_USAGE
100#define alloc_thread_info(tsk) \
101	((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \
102		THREAD_SIZE_ORDER))
103#else
104#define alloc_thread_info(tsk) \
105	((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
106#endif
107
108#define free_thread_info(info) \
109	free_pages((unsigned long)info, THREAD_SIZE_ORDER);
110
111#define thread_saved_pc(tsk)	\
112	((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
113#define thread_saved_fp(tsk)	\
114	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
115
116extern void crunch_task_disable(struct thread_info *);
117extern void crunch_task_copy(struct thread_info *, void *);
118extern void crunch_task_restore(struct thread_info *, void *);
119extern void crunch_task_release(struct thread_info *);
120
121extern void iwmmxt_task_disable(struct thread_info *);
122extern void iwmmxt_task_copy(struct thread_info *, void *);
123extern void iwmmxt_task_restore(struct thread_info *, void *);
124extern void iwmmxt_task_release(struct thread_info *);
125extern void iwmmxt_task_switch(struct thread_info *);
126
127#endif
128
129/*
130 * We use bit 30 of the preempt_count to indicate that kernel
131 * preemption is occurring.  See include/asm-arm/hardirq.h.
132 */
133#define PREEMPT_ACTIVE	0x40000000
134
135/*
136 * thread information flags:
137 *  TIF_SYSCALL_TRACE	- syscall trace active
138 *  TIF_NOTIFY_RESUME	- resumption notification requested
139 *  TIF_SIGPENDING	- signal pending
140 *  TIF_NEED_RESCHED	- rescheduling necessary
141 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
142 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
143 */
144#define TIF_NOTIFY_RESUME	0
145#define TIF_SIGPENDING		1
146#define TIF_NEED_RESCHED	2
147#define TIF_SYSCALL_TRACE	8
148#define TIF_POLLING_NRFLAG	16
149#define TIF_USING_IWMMXT	17
150#define TIF_MEMDIE		18
151#define TIF_FREEZE		19
152
153#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
154#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
155#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
156#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
157#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
158#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
159#define _TIF_FREEZE		(1 << TIF_FREEZE)
160
161/*
162 * Change these and you break ASM code in entry-common.S
163 */
164#define _TIF_WORK_MASK		0x000000ff
165
166#endif /* __KERNEL__ */
167#endif /* __ASM_ARM_THREAD_INFO_H */
168