2 * arch/arm/include/asm/thread_info.h
4 * Copyright (C) 2002 Russell King.
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.
10 #ifndef __ASM_ARM_THREAD_INFO_H
11 #define __ASM_ARM_THREAD_INFO_H
15 #include <linux/compiler.h>
16 #include <asm/fpstate.h>
19 #define THREAD_SIZE_ORDER 1
20 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
21 #define THREAD_START_SP (THREAD_SIZE - 8)
27 #include <asm/types.h>
28 #include <asm/domain.h>
30 typedef unsigned long mm_segment_t;
32 struct cpu_context_save {
43 __u32 extra[2]; /* Xscale 'acc' register, etc */
47 * low level task data that entry.S needs immediate access to.
48 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
51 unsigned long flags; /* low level flags */
52 int preempt_count; /* 0 => preemptable, <0 => bug */
53 int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
54 mm_segment_t addr_limit; /* address limit */
55 struct task_struct *task; /* main task structure */
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[2]; /* TLS registers */
63 struct crunch_state crunchstate;
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 */
72 #define INIT_THREAD_INFO(tsk) \
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), \
83 #define init_thread_info (init_thread_union.thread_info)
84 #define init_stack (init_thread_union.stack)
87 * how to get the current stack pointer in C
89 register unsigned long current_stack_pointer asm ("sp");
92 * how to get the thread information struct from C
94 static inline struct thread_info *current_thread_info(void) __attribute_const__;
96 static inline struct thread_info *current_thread_info(void)
98 return (struct thread_info *)
99 (current_stack_pointer & ~(THREAD_SIZE - 1));
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))
107 #ifndef CONFIG_THUMB2_KERNEL
108 #define thread_saved_fp(tsk) \
109 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
111 #define thread_saved_fp(tsk) \
112 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
115 extern void crunch_task_disable(struct thread_info *);
116 extern void crunch_task_copy(struct thread_info *, void *);
117 extern void crunch_task_restore(struct thread_info *, void *);
118 extern void crunch_task_release(struct thread_info *);
120 extern void iwmmxt_task_disable(struct thread_info *);
121 extern void iwmmxt_task_copy(struct thread_info *, void *);
122 extern void iwmmxt_task_restore(struct thread_info *, void *);
123 extern void iwmmxt_task_release(struct thread_info *);
124 extern void iwmmxt_task_switch(struct thread_info *);
126 extern void vfp_sync_hwstate(struct thread_info *);
127 extern void vfp_flush_hwstate(struct thread_info *);
132 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
133 struct user_vfp_exc __user *);
134 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
135 struct user_vfp_exc __user *);
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
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_NEED_RESCHED_LAZY 3
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
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_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
166 #define _TIF_UPROBE (1 << TIF_UPROBE)
167 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
168 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
169 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
170 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
171 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
173 /* Checks for any syscall work in entry-common.S */
174 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
175 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
178 * Change these and you break ASM code in entry-common.S
180 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
181 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
183 #endif /* __KERNEL__ */
184 #endif /* __ASM_ARM_THREAD_INFO_H */