Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __UM_THREAD_INFO_H
7#define __UM_THREAD_INFO_H
8
9#ifndef __ASSEMBLY__
10
11#include <asm/types.h>
12#include <asm/page.h>
13#include <asm/uaccess.h>
14
15struct thread_info {
16 struct task_struct *task; /* main task structure */
17 struct exec_domain *exec_domain; /* execution domain */
18 unsigned long flags; /* low level flags */
19 __u32 cpu; /* current CPU */
20 int preempt_count; /* 0 => preemptable,
21 <0 => BUG */
22 mm_segment_t addr_limit; /* thread address space:
23 0-0xBFFFFFFF for user
24 0-0xFFFFFFFF for kernel */
25 struct restart_block restart_block;
26 struct thread_info *real_thread; /* Points to non-IRQ stack */
27};
28
29#define INIT_THREAD_INFO(tsk) \
30{ \
31 .task = &tsk, \
32 .exec_domain = &default_exec_domain, \
33 .flags = 0, \
34 .cpu = 0, \
35 .preempt_count = 1, \
36 .addr_limit = KERNEL_DS, \
37 .restart_block = { \
38 .fn = do_no_restart_syscall, \
39 }, \
40 .real_thread = NULL, \
41}
42
43#define init_thread_info (init_thread_union.thread_info)
44#define init_stack (init_thread_union.stack)
45
46#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
47/* how to get the thread information struct from C */
48static inline struct thread_info *current_thread_info(void)
49{
50 struct thread_info *ti;
51 unsigned long mask = THREAD_SIZE - 1;
52 ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
53 return ti;
54}
55
56#ifdef CONFIG_DEBUG_STACK_USAGE
57
58#define alloc_thread_info(tsk) \
59 ((struct thread_info *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, \
60 CONFIG_KERNEL_STACK_ORDER))
61#else
62
63/* thread information allocation */
64#define alloc_thread_info(tsk) \
65 ((struct thread_info *) __get_free_pages(GFP_KERNEL, \
66 CONFIG_KERNEL_STACK_ORDER))
67#endif
68
69#define free_thread_info(ti) \
70 free_pages((unsigned long)(ti),CONFIG_KERNEL_STACK_ORDER)
71
72#endif
73
74#define PREEMPT_ACTIVE 0x10000000
75
76#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
77#define TIF_SIGPENDING 1 /* signal pending */
78#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
79#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
80 * TIF_NEED_RESCHED
81 */
82#define TIF_RESTART_BLOCK 4
83#define TIF_MEMDIE 5
84#define TIF_SYSCALL_AUDIT 6
85#define TIF_RESTORE_SIGMASK 7
86
87#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
88#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
89#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
90#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
91#define _TIF_MEMDIE (1 << TIF_MEMDIE)
92#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
93#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
94
95#endif