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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/* thread_info.h: CRIS low-level thread information
3 *
4 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6 *
7 * CRIS port by Axis Communications
8 */
9
10#ifndef _ASM_THREAD_INFO_H
11#define _ASM_THREAD_INFO_H
12
13#ifdef __KERNEL__
14
15#ifndef __ASSEMBLY__
16#include <asm/types.h>
17#include <asm/processor.h>
18#include <arch/thread_info.h>
19#include <asm/segment.h>
20#endif
21
22
23/*
24 * low level task data that entry.S needs immediate access to
25 * - this struct should fit entirely inside of one cache line
26 * - this struct shares the supervisor stack pages
27 * - if the contents of this structure are changed, the assembly constants must also be changed
28 */
29#ifndef __ASSEMBLY__
30struct thread_info {
31 struct task_struct *task; /* main task structure */
32 unsigned long flags; /* low level flags */
33 __u32 cpu; /* current CPU */
34 int preempt_count; /* 0 => preemptable, <0 => BUG */
35 __u32 tls; /* TLS for this thread */
36
37 mm_segment_t addr_limit; /* thread address space:
38 0-0xBFFFFFFF for user-thead
39 0-0xFFFFFFFF for kernel-thread
40 */
41 __u8 supervisor_stack[0];
42};
43
44#endif
45
46/*
47 * macros/functions for gaining access to the thread information structure
48 */
49#ifndef __ASSEMBLY__
50#define INIT_THREAD_INFO(tsk) \
51{ \
52 .task = &tsk, \
53 .flags = 0, \
54 .cpu = 0, \
55 .preempt_count = INIT_PREEMPT_COUNT, \
56 .addr_limit = KERNEL_DS, \
57}
58
59#define init_thread_info (init_thread_union.thread_info)
60
61#endif /* !__ASSEMBLY__ */
62
63/*
64 * thread information flags
65 * - these are process state flags that various assembly files may need to access
66 * - pending work-to-be-done flags are in LSW
67 * - other flags in MSW
68 */
69#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
70#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
71#define TIF_SIGPENDING 2 /* signal pending */
72#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
73#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
74#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
75
76#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
77#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
78#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
79#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
80
81#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
82#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
83
84#endif /* __KERNEL__ */
85
86#endif /* _ASM_THREAD_INFO_H */