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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 <asm/fpstate.h>
16
17#ifndef __ASSEMBLY__
18
19struct task_struct;
20struct exec_domain;
21
22#include <asm/ptrace.h>
23#include <asm/types.h>
24#include <asm/domain.h>
25
26typedef unsigned long mm_segment_t;
27
28struct cpu_context_save {
29 __u32 r4;
30 __u32 r5;
31 __u32 r6;
32 __u32 r7;
33 __u32 r8;
34 __u32 r9;
35 __u32 sl;
36 __u32 fp;
37 __u32 sp;
38 __u32 pc;
39 __u32 extra[2]; /* Xscale 'acc' register, etc */
40};
41
42/*
43 * low level task data that entry.S needs immediate access to.
44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
45 */
46struct thread_info {
47 unsigned long flags; /* low level flags */
48 __s32 preempt_count; /* 0 => preemptable, <0 => bug */
49 mm_segment_t addr_limit; /* address limit */
50 struct task_struct *task; /* main task structure */
51 struct exec_domain *exec_domain; /* execution domain */
52 __u32 cpu; /* cpu */
53 __u32 cpu_domain; /* cpu domain */
54 struct cpu_context_save cpu_context; /* cpu context */
55 __u8 used_cp[16]; /* thread used copro */
56 unsigned long tp_value;
57 union fp_state fpstate;
58 union vfp_state vfpstate;
59 struct restart_block restart_block;
60};
61
62#define INIT_THREAD_INFO(tsk) \
63{ \
64 .task = &tsk, \
65 .exec_domain = &default_exec_domain, \
66 .flags = 0, \
67 .preempt_count = 1, \
68 .addr_limit = KERNEL_DS, \
69 .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
70 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
71 domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
72 .restart_block = { \
73 .fn = do_no_restart_syscall, \
74 }, \
75}
76
77#define init_thread_info (init_thread_union.thread_info)
78#define init_stack (init_thread_union.stack)
79
80#define THREAD_SIZE 8192
81
82/*
83 * how to get the thread information struct from C
84 */
85static inline struct thread_info *current_thread_info(void) __attribute_const__;
86
87static inline struct thread_info *current_thread_info(void)
88{
89 register unsigned long sp asm ("sp");
90 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
91}
92
93extern struct thread_info *alloc_thread_info(struct task_struct *task);
94extern void free_thread_info(struct thread_info *);
95
96#define get_thread_info(ti) get_task_struct((ti)->task)
97#define put_thread_info(ti) put_task_struct((ti)->task)
98
99#define thread_saved_pc(tsk) \
100 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
101#define thread_saved_fp(tsk) \
102 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
103
104extern void iwmmxt_task_disable(struct thread_info *);
105extern void iwmmxt_task_copy(struct thread_info *, void *);
106extern void iwmmxt_task_restore(struct thread_info *, void *);
107extern void iwmmxt_task_release(struct thread_info *);
108
109#endif
110
111/*
112 * We use bit 30 of the preempt_count to indicate that kernel
113 * preemption is occuring. See include/asm-arm/hardirq.h.
114 */
115#define PREEMPT_ACTIVE 0x40000000
116
117/*
118 * thread information flags:
119 * TIF_SYSCALL_TRACE - syscall trace active
120 * TIF_NOTIFY_RESUME - resumption notification requested
121 * TIF_SIGPENDING - signal pending
122 * TIF_NEED_RESCHED - rescheduling necessary
123 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
124 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
125 */
126#define TIF_NOTIFY_RESUME 0
127#define TIF_SIGPENDING 1
128#define TIF_NEED_RESCHED 2
129#define TIF_SYSCALL_TRACE 8
130#define TIF_POLLING_NRFLAG 16
131#define TIF_USING_IWMMXT 17
132#define TIF_MEMDIE 18
133
134#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
135#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
136#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
137#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
138#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
139#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
140
141/*
142 * Change these and you break ASM code in entry-common.S
143 */
144#define _TIF_WORK_MASK 0x000000ff
145
146#endif /* __KERNEL__ */
147#endif /* __ASM_ARM_THREAD_INFO_H */