typo fixes: occuring -> occurring
[linux-2.6.git] / include / asm-arm / thread_info.h
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
24 struct task_struct;
25 struct exec_domain;
26
27 #include <asm/ptrace.h>
28 #include <asm/types.h>
29 #include <asm/domain.h>
30
31 typedef unsigned long mm_segment_t;
32
33 struct 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  */
51 struct 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         __u8                    used_cp[16];    /* thread used copro */
61         unsigned long           tp_value;
62         struct crunch_state     crunchstate;
63         union fp_state          fpstate __attribute__((aligned(8)));
64         union vfp_state         vfpstate;
65         struct restart_block    restart_block;
66 };
67
68 #define INIT_THREAD_INFO(tsk)                                           \
69 {                                                                       \
70         .task           = &tsk,                                         \
71         .exec_domain    = &default_exec_domain,                         \
72         .flags          = 0,                                            \
73         .preempt_count  = 1,                                            \
74         .addr_limit     = KERNEL_DS,                                    \
75         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
76                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
77                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
78         .restart_block  = {                                             \
79                 .fn     = do_no_restart_syscall,                        \
80         },                                                              \
81 }
82
83 #define init_thread_info        (init_thread_union.thread_info)
84 #define init_stack              (init_thread_union.stack)
85
86 /*
87  * how to get the thread information struct from C
88  */
89 static inline struct thread_info *current_thread_info(void) __attribute_const__;
90
91 static inline struct thread_info *current_thread_info(void)
92 {
93         register unsigned long sp asm ("sp");
94         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
95 }
96
97 extern struct thread_info *alloc_thread_info(struct task_struct *task);
98 extern void free_thread_info(struct thread_info *);
99
100 #define thread_saved_pc(tsk)    \
101         ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
102 #define thread_saved_fp(tsk)    \
103         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
104
105 extern void crunch_task_disable(struct thread_info *);
106 extern void crunch_task_copy(struct thread_info *, void *);
107 extern void crunch_task_restore(struct thread_info *, void *);
108 extern void crunch_task_release(struct thread_info *);
109
110 extern void iwmmxt_task_disable(struct thread_info *);
111 extern void iwmmxt_task_copy(struct thread_info *, void *);
112 extern void iwmmxt_task_restore(struct thread_info *, void *);
113 extern void iwmmxt_task_release(struct thread_info *);
114
115 #endif
116
117 /*
118  * We use bit 30 of the preempt_count to indicate that kernel
119  * preemption is occurring.  See include/asm-arm/hardirq.h.
120  */
121 #define PREEMPT_ACTIVE  0x40000000
122
123 /*
124  * thread information flags:
125  *  TIF_SYSCALL_TRACE   - syscall trace active
126  *  TIF_NOTIFY_RESUME   - resumption notification requested
127  *  TIF_SIGPENDING      - signal pending
128  *  TIF_NEED_RESCHED    - rescheduling necessary
129  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
130  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
131  */
132 #define TIF_NOTIFY_RESUME       0
133 #define TIF_SIGPENDING          1
134 #define TIF_NEED_RESCHED        2
135 #define TIF_SYSCALL_TRACE       8
136 #define TIF_POLLING_NRFLAG      16
137 #define TIF_USING_IWMMXT        17
138 #define TIF_MEMDIE              18
139
140 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
141 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
142 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
143 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
144 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
145 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
146
147 /*
148  * Change these and you break ASM code in entry-common.S
149  */
150 #define _TIF_WORK_MASK          0x000000ff
151
152 #endif /* __KERNEL__ */
153 #endif /* __ASM_ARM_THREAD_INFO_H */