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thread_info.h
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1 /*
2  * arch/arm/include/asm/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 
24 struct task_struct;
25 struct exec_domain;
26 
27 #include <asm/types.h>
28 #include <asm/domain.h>
29 
30 typedef unsigned long mm_segment_t;
31 
32 struct 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  */
50 struct 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  __u32 syscall; /* syscall number */
60  __u8 used_cp[16]; /* thread used copro */
61  unsigned long tp_value;
62 #ifdef CONFIG_CRUNCH
63  struct crunch_state crunchstate;
64 #endif
65  union fp_state fpstate __attribute__((aligned(8)));
66  union vfp_state vfpstate;
67 #ifdef CONFIG_ARM_THUMBEE
68  unsigned long thumbee_state; /* ThumbEE Handler Base register */
69 #endif
71 };
72 
73 #define INIT_THREAD_INFO(tsk) \
74 { \
75  .task = &tsk, \
76  .exec_domain = &default_exec_domain, \
77  .flags = 0, \
78  .preempt_count = INIT_PREEMPT_COUNT, \
79  .addr_limit = KERNEL_DS, \
80  .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
81  domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
82  domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
83  .restart_block = { \
84  .fn = do_no_restart_syscall, \
85  }, \
86 }
87 
88 #define init_thread_info (init_thread_union.thread_info)
89 #define init_stack (init_thread_union.stack)
90 
91 /*
92  * how to get the thread information struct from C
93  */
94 static inline struct thread_info *current_thread_info(void) __attribute_const__;
95 
97 {
98  register unsigned long sp asm ("sp");
99  return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
100 }
101 
102 #define thread_saved_pc(tsk) \
103  ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
104 #define thread_saved_sp(tsk) \
105  ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
106 #define thread_saved_fp(tsk) \
107  ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
108 
109 extern void crunch_task_disable(struct thread_info *);
110 extern void crunch_task_copy(struct thread_info *, void *);
111 extern void crunch_task_restore(struct thread_info *, void *);
112 extern void crunch_task_release(struct thread_info *);
113 
114 extern void iwmmxt_task_disable(struct thread_info *);
115 extern void iwmmxt_task_copy(struct thread_info *, void *);
116 extern void iwmmxt_task_restore(struct thread_info *, void *);
117 extern void iwmmxt_task_release(struct thread_info *);
118 extern void iwmmxt_task_switch(struct thread_info *);
119 
120 extern void vfp_sync_hwstate(struct thread_info *);
121 extern void vfp_flush_hwstate(struct thread_info *);
122 
123 struct user_vfp;
124 struct user_vfp_exc;
125 
126 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
127  struct user_vfp_exc __user *);
128 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
129  struct user_vfp_exc __user *);
130 #endif
131 
132 /*
133  * We use bit 30 of the preempt_count to indicate that kernel
134  * preemption is occurring. See <asm/hardirq.h>.
135  */
136 #define PREEMPT_ACTIVE 0x40000000
137 
138 /*
139  * thread information flags:
140  * TIF_SYSCALL_TRACE - syscall trace active
141  * TIF_SYSCAL_AUDIT - syscall auditing active
142  * TIF_SIGPENDING - signal pending
143  * TIF_NEED_RESCHED - rescheduling necessary
144  * TIF_NOTIFY_RESUME - callback before returning to user
145  * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
146  * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
147  */
148 #define TIF_SIGPENDING 0
149 #define TIF_NEED_RESCHED 1
150 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
151 #define TIF_SYSCALL_TRACE 8
152 #define TIF_SYSCALL_AUDIT 9
153 #define TIF_SYSCALL_TRACEPOINT 10
154 #define TIF_USING_IWMMXT 17
155 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
156 #define TIF_RESTORE_SIGMASK 20
157 #define TIF_SECCOMP 21
158 #define TIF_SWITCH_MM 22 /* deferred switch_mm */
159 
160 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
161 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
162 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
163 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
164 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
165 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
166 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
167 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
168 
169 /* Checks for any syscall work in entry-common.S */
170 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
171 
172 /*
173  * Change these and you break ASM code in entry-common.S
174  */
175 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME)
176 
177 #endif /* __KERNEL__ */
178 #endif /* __ASM_ARM_THREAD_INFO_H */