tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fork
Configure Feed
Select the types of activity you want to include in your feed.
1/* thread_info.h: description
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * Derived from include/asm-i386/thread_info.h
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef _ASM_THREAD_INFO_H
14#define _ASM_THREAD_INFO_H
15
16#ifdef __KERNEL__
17
18#ifndef __ASSEMBLY__
19#include <asm/processor.h>
20#endif
21
22#define THREAD_SIZE 8192
23
24#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
25
26/*
27 * low level task data that entry.S needs immediate access to
28 * - this struct should fit entirely inside of one cache line
29 * - this struct shares the supervisor stack pages
30 * - if the contents of this structure are changed, the assembly constants must also be changed
31 */
32#ifndef __ASSEMBLY__
33
34struct thread_info {
35 struct task_struct *task; /* main task structure */
36 struct exec_domain *exec_domain; /* execution domain */
37 unsigned long flags; /* low level flags */
38 unsigned long status; /* thread-synchronous flags */
39 __u32 cpu; /* current CPU */
40 int preempt_count; /* 0 => preemptable, <0 => BUG */
41
42 mm_segment_t addr_limit; /* thread address space:
43 * 0-0xBFFFFFFF for user-thead
44 * 0-0xFFFFFFFF for kernel-thread
45 */
46 struct restart_block restart_block;
47
48 __u8 supervisor_stack[0];
49};
50
51#else /* !__ASSEMBLY__ */
52
53#include <asm/asm-offsets.h>
54
55#endif
56
57#define PREEMPT_ACTIVE 0x10000000
58
59/*
60 * macros/functions for gaining access to the thread information structure
61 */
62#ifndef __ASSEMBLY__
63
64#define INIT_THREAD_INFO(tsk) \
65{ \
66 .task = &tsk, \
67 .exec_domain = &default_exec_domain, \
68 .flags = 0, \
69 .cpu = 0, \
70 .preempt_count = INIT_PREEMPT_COUNT, \
71 .addr_limit = KERNEL_DS, \
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/* how to get the thread information struct from C */
81register struct thread_info *__current_thread_info asm("gr15");
82
83#define current_thread_info() ({ __current_thread_info; })
84
85#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
86
87/* thread information allocation */
88#ifdef CONFIG_DEBUG_STACK_USAGE
89#define alloc_thread_info_node(tsk, node) \
90 kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)
91#else
92#define alloc_thread_info_node(tsk, node) \
93 kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
94#endif
95
96#define free_thread_info(info) kfree(info)
97
98#endif /* __ASSEMBLY__ */
99
100/*
101 * thread information flags
102 * - these are process state flags that various assembly files may need to access
103 * - pending work-to-be-done flags are in LSW
104 * - other flags in MSW
105 */
106#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
107#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
108#define TIF_SIGPENDING 2 /* signal pending */
109#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
110#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
111#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
112#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
113#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
114#define TIF_FREEZE 18 /* freezing for suspend */
115
116#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
117#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
118#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
119#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
120#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
121#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
122#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
123#define _TIF_FREEZE (1 << TIF_FREEZE)
124
125#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
126#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
127
128/*
129 * Thread-synchronous status.
130 *
131 * This is different from the flags in that nobody else
132 * ever touches our thread-synchronous status, so we don't
133 * have to worry about atomic accesses.
134 */
135#define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */
136
137#endif /* __KERNEL__ */
138
139#endif /* _ASM_THREAD_INFO_H */