Linux kernel mirror (for testing)
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linux
1/*
2 * S390 version
3 * Copyright IBM Corp. 2002, 2006
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
5 */
6
7#ifndef _ASM_THREAD_INFO_H
8#define _ASM_THREAD_INFO_H
9
10#include <linux/const.h>
11
12/*
13 * Size of kernel stack for each process
14 */
15#define THREAD_ORDER 2
16#define ASYNC_ORDER 2
17
18#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
19#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
20
21#ifndef __ASSEMBLY__
22#include <asm/lowcore.h>
23#include <asm/page.h>
24#include <asm/processor.h>
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 */
32struct thread_info {
33 struct task_struct *task; /* main task structure */
34 unsigned long flags; /* low level flags */
35 unsigned long sys_call_table; /* System call table address */
36 unsigned int cpu; /* current CPU */
37 int preempt_count; /* 0 => preemptable, <0 => BUG */
38 unsigned int system_call;
39 __u64 user_timer;
40 __u64 system_timer;
41 unsigned long last_break; /* last breaking-event-address. */
42};
43
44/*
45 * macros/functions for gaining access to the thread information structure
46 */
47#define INIT_THREAD_INFO(tsk) \
48{ \
49 .task = &tsk, \
50 .flags = 0, \
51 .cpu = 0, \
52 .preempt_count = INIT_PREEMPT_COUNT, \
53}
54
55#define init_thread_info (init_thread_union.thread_info)
56#define init_stack (init_thread_union.stack)
57
58/* how to get the thread information struct from C */
59static inline struct thread_info *current_thread_info(void)
60{
61 return (struct thread_info *) S390_lowcore.thread_info;
62}
63
64void arch_release_task_struct(struct task_struct *tsk);
65int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
66
67#define THREAD_SIZE_ORDER THREAD_ORDER
68
69#endif
70
71/*
72 * thread information flags bit numbers
73 */
74#define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
75#define TIF_SIGPENDING 1 /* signal pending */
76#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
77#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
78#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
79#define TIF_SECCOMP 5 /* secure computing */
80#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
81#define TIF_UPROBE 7 /* breakpointed or single-stepping */
82#define TIF_31BIT 16 /* 32bit process */
83#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
84#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
85#define TIF_SINGLE_STEP 19 /* This task is single stepped */
86#define TIF_BLOCK_STEP 20 /* This task is block stepped */
87#define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */
88
89#define _TIF_NOTIFY_RESUME _BITUL(TIF_NOTIFY_RESUME)
90#define _TIF_SIGPENDING _BITUL(TIF_SIGPENDING)
91#define _TIF_NEED_RESCHED _BITUL(TIF_NEED_RESCHED)
92#define _TIF_SYSCALL_TRACE _BITUL(TIF_SYSCALL_TRACE)
93#define _TIF_SYSCALL_AUDIT _BITUL(TIF_SYSCALL_AUDIT)
94#define _TIF_SECCOMP _BITUL(TIF_SECCOMP)
95#define _TIF_SYSCALL_TRACEPOINT _BITUL(TIF_SYSCALL_TRACEPOINT)
96#define _TIF_UPROBE _BITUL(TIF_UPROBE)
97#define _TIF_31BIT _BITUL(TIF_31BIT)
98#define _TIF_SINGLE_STEP _BITUL(TIF_SINGLE_STEP)
99
100#endif /* _ASM_THREAD_INFO_H */