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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#include <asm/page.h>
18
19#define THREAD_SIZE_ORDER 1
20#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
21#define THREAD_START_SP (THREAD_SIZE - 8)
22
23#ifndef __ASSEMBLY__
24
25struct task_struct;
26struct exec_domain;
27
28#include <asm/types.h>
29#include <asm/domain.h>
30
31typedef unsigned long mm_segment_t;
32
33struct 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 */
51struct 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 __u32 syscall; /* syscall number */
61 __u8 used_cp[16]; /* thread used copro */
62 unsigned long tp_value[2]; /* TLS registers */
63#ifdef CONFIG_CRUNCH
64 struct crunch_state crunchstate;
65#endif
66 union fp_state fpstate __attribute__((aligned(8)));
67 union vfp_state vfpstate;
68#ifdef CONFIG_ARM_THUMBEE
69 unsigned long thumbee_state; /* ThumbEE Handler Base register */
70#endif
71 struct restart_block restart_block;
72};
73
74#define INIT_THREAD_INFO(tsk) \
75{ \
76 .task = &tsk, \
77 .exec_domain = &default_exec_domain, \
78 .flags = 0, \
79 .preempt_count = INIT_PREEMPT_COUNT, \
80 .addr_limit = KERNEL_DS, \
81 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
82 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
83 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
84 .restart_block = { \
85 .fn = do_no_restart_syscall, \
86 }, \
87}
88
89#define init_thread_info (init_thread_union.thread_info)
90#define init_stack (init_thread_union.stack)
91
92/*
93 * how to get the thread information struct from C
94 */
95static inline struct thread_info *current_thread_info(void) __attribute_const__;
96
97static inline struct thread_info *current_thread_info(void)
98{
99 register unsigned long sp asm ("sp");
100 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
101}
102
103#define thread_saved_pc(tsk) \
104 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
105#define thread_saved_sp(tsk) \
106 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
107
108#ifndef CONFIG_THUMB2_KERNEL
109#define thread_saved_fp(tsk) \
110 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
111#else
112#define thread_saved_fp(tsk) \
113 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
114#endif
115
116extern void crunch_task_disable(struct thread_info *);
117extern void crunch_task_copy(struct thread_info *, void *);
118extern void crunch_task_restore(struct thread_info *, void *);
119extern void crunch_task_release(struct thread_info *);
120
121extern void iwmmxt_task_disable(struct thread_info *);
122extern void iwmmxt_task_copy(struct thread_info *, void *);
123extern void iwmmxt_task_restore(struct thread_info *, void *);
124extern void iwmmxt_task_release(struct thread_info *);
125extern void iwmmxt_task_switch(struct thread_info *);
126
127extern void vfp_sync_hwstate(struct thread_info *);
128extern void vfp_flush_hwstate(struct thread_info *);
129
130struct user_vfp;
131struct user_vfp_exc;
132
133extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
134 struct user_vfp_exc __user *);
135extern int vfp_restore_user_hwstate(struct user_vfp __user *,
136 struct user_vfp_exc __user *);
137#endif
138
139/*
140 * thread information flags:
141 * TIF_SYSCALL_TRACE - syscall trace active
142 * TIF_SYSCAL_AUDIT - syscall auditing active
143 * TIF_SIGPENDING - signal pending
144 * TIF_NEED_RESCHED - rescheduling necessary
145 * TIF_NOTIFY_RESUME - callback before returning to user
146 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
147 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
148 */
149#define TIF_SIGPENDING 0
150#define TIF_NEED_RESCHED 1
151#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
152#define TIF_UPROBE 7
153#define TIF_SYSCALL_TRACE 8
154#define TIF_SYSCALL_AUDIT 9
155#define TIF_SYSCALL_TRACEPOINT 10
156#define TIF_SECCOMP 11 /* seccomp syscall filtering active */
157#define TIF_NOHZ 12 /* in adaptive nohz mode */
158#define TIF_USING_IWMMXT 17
159#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
160#define TIF_RESTORE_SIGMASK 20
161
162#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
163#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
164#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
165#define _TIF_UPROBE (1 << TIF_UPROBE)
166#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
167#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
168#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
169#define _TIF_SECCOMP (1 << TIF_SECCOMP)
170#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
171
172/* Checks for any syscall work in entry-common.S */
173#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
174 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
175
176/*
177 * Change these and you break ASM code in entry-common.S
178 */
179#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
180 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
181
182#endif /* __KERNEL__ */
183#endif /* __ASM_ARM_THREAD_INFO_H */