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1/*
2 * linux/include/asm-arm/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/ptrace.h>
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 __u8 used_cp[16]; /* thread used copro */
61 unsigned long tp_value;
62 union fp_state fpstate;
63 union vfp_state vfpstate;
64 struct restart_block restart_block;
65};
66
67#define INIT_THREAD_INFO(tsk) \
68{ \
69 .task = &tsk, \
70 .exec_domain = &default_exec_domain, \
71 .flags = 0, \
72 .preempt_count = 1, \
73 .addr_limit = KERNEL_DS, \
74 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
75 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
76 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
77 .restart_block = { \
78 .fn = do_no_restart_syscall, \
79 }, \
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 thread information struct from C
87 */
88static inline struct thread_info *current_thread_info(void) __attribute_const__;
89
90static inline struct thread_info *current_thread_info(void)
91{
92 register unsigned long sp asm ("sp");
93 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
94}
95
96extern struct thread_info *alloc_thread_info(struct task_struct *task);
97extern void free_thread_info(struct thread_info *);
98
99#define get_thread_info(ti) get_task_struct((ti)->task)
100#define put_thread_info(ti) put_task_struct((ti)->task)
101
102#define thread_saved_pc(tsk) \
103 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
104#define thread_saved_fp(tsk) \
105 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
106
107extern void iwmmxt_task_disable(struct thread_info *);
108extern void iwmmxt_task_copy(struct thread_info *, void *);
109extern void iwmmxt_task_restore(struct thread_info *, void *);
110extern void iwmmxt_task_release(struct thread_info *);
111
112#endif
113
114/*
115 * We use bit 30 of the preempt_count to indicate that kernel
116 * preemption is occuring. See include/asm-arm/hardirq.h.
117 */
118#define PREEMPT_ACTIVE 0x40000000
119
120/*
121 * thread information flags:
122 * TIF_SYSCALL_TRACE - syscall trace active
123 * TIF_NOTIFY_RESUME - resumption notification requested
124 * TIF_SIGPENDING - signal pending
125 * TIF_NEED_RESCHED - rescheduling necessary
126 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
127 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
128 */
129#define TIF_NOTIFY_RESUME 0
130#define TIF_SIGPENDING 1
131#define TIF_NEED_RESCHED 2
132#define TIF_SYSCALL_TRACE 8
133#define TIF_POLLING_NRFLAG 16
134#define TIF_USING_IWMMXT 17
135#define TIF_MEMDIE 18
136
137#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
138#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
139#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
140#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
141#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
142#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
143
144/*
145 * Change these and you break ASM code in entry-common.S
146 */
147#define _TIF_WORK_MASK 0x000000ff
148
149#endif /* __KERNEL__ */
150#endif /* __ASM_ARM_THREAD_INFO_H */