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