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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
24struct task_struct;
25struct exec_domain;
26
27#include <asm/types.h>
28#include <asm/domain.h>
29
30typedef unsigned long mm_segment_t;
31
32struct 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 */
50struct 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
70 struct restart_block restart_block;
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 */
94static inline struct thread_info *current_thread_info(void) __attribute_const__;
95
96static inline struct thread_info *current_thread_info(void)
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
109extern void crunch_task_disable(struct thread_info *);
110extern void crunch_task_copy(struct thread_info *, void *);
111extern void crunch_task_restore(struct thread_info *, void *);
112extern void crunch_task_release(struct thread_info *);
113
114extern void iwmmxt_task_disable(struct thread_info *);
115extern void iwmmxt_task_copy(struct thread_info *, void *);
116extern void iwmmxt_task_restore(struct thread_info *, void *);
117extern void iwmmxt_task_release(struct thread_info *);
118extern void iwmmxt_task_switch(struct thread_info *);
119
120extern void vfp_sync_hwstate(struct thread_info *);
121extern void vfp_flush_hwstate(struct thread_info *);
122
123struct user_vfp;
124struct user_vfp_exc;
125
126extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
127 struct user_vfp_exc __user *);
128extern 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 */