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Linux kernel mirror (for testing)
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linux
1/*
2 * linux/include/asm-arm26/thread_info.h
3 *
4 * Copyright (C) 2002 Russell King.
5 * Copyright (C) 2003 Ian Molton.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef __ASM_ARM_THREAD_INFO_H
12#define __ASM_ARM_THREAD_INFO_H
13
14#ifdef __KERNEL__
15
16#ifndef __ASSEMBLY__
17
18struct task_struct;
19struct exec_domain;
20
21#include <linux/compiler.h>
22#include <asm/fpstate.h>
23#include <asm/ptrace.h>
24#include <asm/types.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};
40
41/*
42 * low level task data that entry.S needs immediate access to.
43 * We assume cpu_context follows immedately after cpu_domain.
44 */
45struct thread_info {
46 unsigned long flags; /* low level flags */
47 int preempt_count; /* 0 => preemptable, <0 => bug */
48 mm_segment_t addr_limit; /* address limit */
49 struct task_struct *task; /* main task structure */
50 struct exec_domain *exec_domain; /* execution domain */
51 __u32 cpu; /* cpu */
52 struct cpu_context_save cpu_context; /* cpu context */
53 struct restart_block restart_block;
54 union fp_state fpstate;
55};
56
57#define INIT_THREAD_INFO(tsk) \
58{ \
59 .task &tsk, \
60 .exec_domain &default_exec_domain, \
61 .flags 0, \
62 .preempt_count 0, \
63 .addr_limit KERNEL_DS, \
64 .restart_block = { \
65 .fn = do_no_restart_syscall, \
66 }, \
67}
68
69#define init_thread_info (init_thread_union.thread_info)
70#define init_stack (init_thread_union.stack)
71
72/*
73 * how to get the thread information struct from C
74 */
75static inline struct thread_info *current_thread_info(void) __attribute_const__;
76
77static inline struct thread_info *current_thread_info(void)
78{
79 register unsigned long sp asm ("sp");
80 return (struct thread_info *)(sp & ~0x1fff);
81}
82
83/* FIXME - PAGE_SIZE < 32K */
84#define THREAD_SIZE (8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768
85#define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1)
86
87extern struct thread_info *alloc_thread_info(struct task_struct *task);
88extern void free_thread_info(struct thread_info *);
89
90#define get_thread_info(ti) get_task_struct((ti)->task)
91#define put_thread_info(ti) put_task_struct((ti)->task)
92
93#define thread_saved_pc(tsk) \
94 ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
95#define thread_saved_fp(tsk) \
96 ((unsigned long)((tsk)->thread_info->cpu_context.fp))
97
98#else /* !__ASSEMBLY__ */
99
100#define TI_FLAGS 0
101#define TI_PREEMPT 4
102#define TI_ADDR_LIMIT 8
103#define TI_TASK 12
104#define TI_EXEC_DOMAIN 16
105#define TI_CPU 20
106#define TI_CPU_SAVE 24
107#define TI_RESTART_BLOCK 28
108#define TI_FPSTATE 68
109
110#endif
111
112#define PREEMPT_ACTIVE 0x04000000
113
114/*
115 * thread information flags:
116 * TIF_SYSCALL_TRACE - syscall trace active
117 * TIF_NOTIFY_RESUME - resumption notification requested
118 * TIF_SIGPENDING - signal pending
119 * TIF_NEED_RESCHED - rescheduling necessary
120 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
121 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
122 */
123#define TIF_NOTIFY_RESUME 0
124#define TIF_SIGPENDING 1
125#define TIF_NEED_RESCHED 2
126#define TIF_SYSCALL_TRACE 8
127#define TIF_USED_FPU 16
128#define TIF_POLLING_NRFLAG 17
129#define TIF_MEMDIE 18
130
131#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
132#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
133#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
134#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
135#define _TIF_USED_FPU (1 << TIF_USED_FPU)
136#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
137
138/*
139 * Change these and you break ASM code in entry-common.S
140 */
141#define _TIF_WORK_MASK 0x000000ff
142
143#endif /* __KERNEL__ */
144#endif /* __ASM_ARM_THREAD_INFO_H */