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