b74970ec02c4431ae1636289ffb3728d5d6bcc8f
[linux-2.6.git] / arch / arm / include / asm / thread_info.h
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         struct crunch_state     crunchstate;
63         union fp_state          fpstate __attribute__((aligned(8)));
64         union vfp_state         vfpstate;
65 #ifdef CONFIG_ARM_THUMBEE
66         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
67 #endif
68         struct restart_block    restart_block;
69 };
70
71 #define INIT_THREAD_INFO(tsk)                                           \
72 {                                                                       \
73         .task           = &tsk,                                         \
74         .exec_domain    = &default_exec_domain,                         \
75         .flags          = 0,                                            \
76         .preempt_count  = INIT_PREEMPT_COUNT,                           \
77         .addr_limit     = KERNEL_DS,                                    \
78         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
79                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
80                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
81         .restart_block  = {                                             \
82                 .fn     = do_no_restart_syscall,                        \
83         },                                                              \
84 }
85
86 #define init_thread_info        (init_thread_union.thread_info)
87 #define init_stack              (init_thread_union.stack)
88
89 /*
90  * how to get the thread information struct from C
91  */
92 static inline struct thread_info *current_thread_info(void) __attribute_const__;
93
94 static inline struct thread_info *current_thread_info(void)
95 {
96         register unsigned long sp asm ("sp");
97         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
98 }
99
100 #define thread_saved_pc(tsk)    \
101         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
102 #define thread_saved_sp(tsk)    \
103         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
104 #define thread_saved_fp(tsk)    \
105         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
106
107 extern void crunch_task_disable(struct thread_info *);
108 extern void crunch_task_copy(struct thread_info *, void *);
109 extern void crunch_task_restore(struct thread_info *, void *);
110 extern void crunch_task_release(struct thread_info *);
111
112 extern void iwmmxt_task_disable(struct thread_info *);
113 extern void iwmmxt_task_copy(struct thread_info *, void *);
114 extern void iwmmxt_task_restore(struct thread_info *, void *);
115 extern void iwmmxt_task_release(struct thread_info *);
116 extern void iwmmxt_task_switch(struct thread_info *);
117
118 extern void vfp_sync_hwstate(struct thread_info *);
119 extern void vfp_flush_hwstate(struct thread_info *);
120
121 #endif
122
123 /*
124  * We use bit 30 of the preempt_count to indicate that kernel
125  * preemption is occurring.  See <asm/hardirq.h>.
126  */
127 #define PREEMPT_ACTIVE  0x40000000
128
129 /*
130  * thread information flags:
131  *  TIF_SYSCALL_TRACE   - syscall trace active
132  *  TIF_SIGPENDING      - signal pending
133  *  TIF_NEED_RESCHED    - rescheduling necessary
134  *  TIF_NOTIFY_RESUME   - callback before returning to user
135  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
136  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
137  */
138 #define TIF_SIGPENDING          0
139 #define TIF_NEED_RESCHED        1
140 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
141 #define TIF_SYSCALL_TRACE       8
142 #define TIF_POLLING_NRFLAG      16
143 #define TIF_USING_IWMMXT        17
144 #define TIF_MEMDIE              18
145 #define TIF_FREEZE              19
146 #define TIF_RESTORE_SIGMASK     20
147
148 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
149 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
150 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
151 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
152 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
153 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
154 #define _TIF_FREEZE             (1 << TIF_FREEZE)
155 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
156
157 /*
158  * Change these and you break ASM code in entry-common.S
159  */
160 #define _TIF_WORK_MASK          0x000000ff
161
162 #endif /* __KERNEL__ */
163 #endif /* __ASM_ARM_THREAD_INFO_H */