Linux-2.6.12-rc2
[linux-3.10.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 <asm/fpstate.h>
16
17 #ifndef __ASSEMBLY__
18
19 struct task_struct;
20 struct exec_domain;
21
22 #include <asm/ptrace.h>
23 #include <asm/types.h>
24 #include <asm/domain.h>
25
26 typedef unsigned long mm_segment_t;
27
28 struct cpu_context_save {
29         __u32   r4;
30         __u32   r5;
31         __u32   r6;
32         __u32   r7;
33         __u32   r8;
34         __u32   r9;
35         __u32   sl;
36         __u32   fp;
37         __u32   sp;
38         __u32   pc;
39         __u32   extra[2];               /* Xscale 'acc' register, etc */
40 };
41
42 /*
43  * low level task data that entry.S needs immediate access to.
44  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
45  */
46 struct thread_info {
47         unsigned long           flags;          /* low level flags */
48         __s32                   preempt_count;  /* 0 => preemptable, <0 => bug */
49         mm_segment_t            addr_limit;     /* address limit */
50         struct task_struct      *task;          /* main task structure */
51         struct exec_domain      *exec_domain;   /* execution domain */
52         __u32                   cpu;            /* cpu */
53         __u32                   cpu_domain;     /* cpu domain */
54         struct cpu_context_save cpu_context;    /* cpu context */
55         __u8                    used_cp[16];    /* thread used copro */
56         unsigned long           tp_value;
57         union fp_state          fpstate;
58         union vfp_state         vfpstate;
59         struct restart_block    restart_block;
60 };
61
62 #define INIT_THREAD_INFO(tsk)                                           \
63 {                                                                       \
64         .task           = &tsk,                                         \
65         .exec_domain    = &default_exec_domain,                         \
66         .flags          = 0,                                            \
67         .preempt_count  = 1,                                            \
68         .addr_limit     = KERNEL_DS,                                    \
69         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
70                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
71                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
72         .restart_block  = {                                             \
73                 .fn     = do_no_restart_syscall,                        \
74         },                                                              \
75 }
76
77 #define init_thread_info        (init_thread_union.thread_info)
78 #define init_stack              (init_thread_union.stack)
79
80 #define THREAD_SIZE             8192
81
82 /*
83  * how to get the thread information struct from C
84  */
85 static inline struct thread_info *current_thread_info(void) __attribute_const__;
86
87 static inline struct thread_info *current_thread_info(void)
88 {
89         register unsigned long sp asm ("sp");
90         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
91 }
92
93 extern struct thread_info *alloc_thread_info(struct task_struct *task);
94 extern void free_thread_info(struct thread_info *);
95
96 #define get_thread_info(ti)     get_task_struct((ti)->task)
97 #define put_thread_info(ti)     put_task_struct((ti)->task)
98
99 #define thread_saved_pc(tsk)    \
100         ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
101 #define thread_saved_fp(tsk)    \
102         ((unsigned long)((tsk)->thread_info->cpu_context.fp))
103
104 extern void iwmmxt_task_disable(struct thread_info *);
105 extern void iwmmxt_task_copy(struct thread_info *, void *);
106 extern void iwmmxt_task_restore(struct thread_info *, void *);
107 extern void iwmmxt_task_release(struct thread_info *);
108
109 #endif
110
111 /*
112  * We use bit 30 of the preempt_count to indicate that kernel
113  * preemption is occuring.  See include/asm-arm/hardirq.h.
114  */
115 #define PREEMPT_ACTIVE  0x40000000
116
117 /*
118  * thread information flags:
119  *  TIF_SYSCALL_TRACE   - syscall trace active
120  *  TIF_NOTIFY_RESUME   - resumption notification requested
121  *  TIF_SIGPENDING      - signal pending
122  *  TIF_NEED_RESCHED    - rescheduling necessary
123  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
124  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
125  */
126 #define TIF_NOTIFY_RESUME       0
127 #define TIF_SIGPENDING          1
128 #define TIF_NEED_RESCHED        2
129 #define TIF_SYSCALL_TRACE       8
130 #define TIF_POLLING_NRFLAG      16
131 #define TIF_USING_IWMMXT        17
132 #define TIF_MEMDIE              18
133
134 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
135 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
136 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
137 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
138 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
139 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
140
141 /*
142  * Change these and you break ASM code in entry-common.S
143  */
144 #define _TIF_WORK_MASK          0x000000ff
145
146 #endif /* __KERNEL__ */
147 #endif /* __ASM_ARM_THREAD_INFO_H */