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_state(struct thread_info *thread);
119
120 #endif
121
122 /*
123 * We use bit 30 of the preempt_count to indicate that kernel
124 * preemption is occurring. See <asm/hardirq.h>.
125 */
126 #define PREEMPT_ACTIVE 0x40000000
127
128 /*
129 * thread information flags:
130 * TIF_SYSCALL_TRACE - syscall trace active
131 * TIF_SIGPENDING - signal pending
132 * TIF_NEED_RESCHED - rescheduling necessary
133 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
134 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
135 */
136 #define TIF_SIGPENDING 0
137 #define TIF_NEED_RESCHED 1
138 #define TIF_SYSCALL_TRACE 8
139 #define TIF_POLLING_NRFLAG 16
140 #define TIF_USING_IWMMXT 17
141 #define TIF_MEMDIE 18
142 #define TIF_FREEZE 19
143
144 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
145 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
146 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
147 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
148 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
149 #define _TIF_FREEZE (1 << TIF_FREEZE)
150
151 /*
152 * Change these and you break ASM code in entry-common.S
153 */
154 #define _TIF_WORK_MASK 0x000000ff
155
156 #endif /* __KERNEL__ */
157 #endif /* __ASM_ARM_THREAD_INFO_H */
158
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