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Linux kernel mirror (for testing)
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1/* thread_info.h: CRIS low-level thread information
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5 *
6 * CRIS port by Axis Communications
7 */
8
9#ifndef _ASM_THREAD_INFO_H
10#define _ASM_THREAD_INFO_H
11
12#ifdef __KERNEL__
13
14#ifndef __ASSEMBLY__
15#include <asm/types.h>
16#include <asm/processor.h>
17#include <arch/thread_info.h>
18#include <asm/segment.h>
19#endif
20
21
22/*
23 * low level task data that entry.S needs immediate access to
24 * - this struct should fit entirely inside of one cache line
25 * - this struct shares the supervisor stack pages
26 * - if the contents of this structure are changed, the assembly constants must also be changed
27 */
28#ifndef __ASSEMBLY__
29struct thread_info {
30 struct task_struct *task; /* main task structure */
31 unsigned long flags; /* low level flags */
32 __u32 cpu; /* current CPU */
33 int preempt_count; /* 0 => preemptable, <0 => BUG */
34 __u32 tls; /* TLS for this thread */
35
36 mm_segment_t addr_limit; /* thread address space:
37 0-0xBFFFFFFF for user-thead
38 0-0xFFFFFFFF for kernel-thread
39 */
40 __u8 supervisor_stack[0];
41};
42
43#endif
44
45/*
46 * macros/functions for gaining access to the thread information structure
47 */
48#ifndef __ASSEMBLY__
49#define INIT_THREAD_INFO(tsk) \
50{ \
51 .task = &tsk, \
52 .flags = 0, \
53 .cpu = 0, \
54 .preempt_count = INIT_PREEMPT_COUNT, \
55 .addr_limit = KERNEL_DS, \
56}
57
58#define init_thread_info (init_thread_union.thread_info)
59
60#endif /* !__ASSEMBLY__ */
61
62/*
63 * thread information flags
64 * - these are process state flags that various assembly files may need to access
65 * - pending work-to-be-done flags are in LSW
66 * - other flags in MSW
67 */
68#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
69#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
70#define TIF_SIGPENDING 2 /* signal pending */
71#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
72#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
73#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
74
75#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
76#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
77#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
78#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
79
80#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
81#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
82
83#endif /* __KERNEL__ */
84
85#endif /* _ASM_THREAD_INFO_H */