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/*
11 * Size of kernel stack for each process
12 */
13#define THREAD_ORDER 2
14#define ASYNC_ORDER 2
15
16#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
17#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
18
19#ifndef __ASSEMBLY__
20#include <asm/lowcore.h>
21#include <asm/page.h>
22#include <asm/processor.h>
23
24/*
25 * low level task data that entry.S needs immediate access to
26 * - this struct should fit entirely inside of one cache line
27 * - this struct shares the supervisor stack pages
28 * - if the contents of this structure are changed, the assembly constants must also be changed
29 */
30struct thread_info {
31 struct task_struct *task; /* main task structure */
32 unsigned long flags; /* low level flags */
33 unsigned long sys_call_table; /* System call table address */
34 unsigned int cpu; /* current CPU */
35 int preempt_count; /* 0 => preemptable, <0 => BUG */
36 unsigned int system_call;
37 __u64 user_timer;
38 __u64 system_timer;
39 unsigned long last_break; /* last breaking-event-address. */
40};
41
42/*
43 * macros/functions for gaining access to the thread information structure
44 */
45#define INIT_THREAD_INFO(tsk) \
46{ \
47 .task = &tsk, \
48 .flags = 0, \
49 .cpu = 0, \
50 .preempt_count = INIT_PREEMPT_COUNT, \
51}
52
53#define init_thread_info (init_thread_union.thread_info)
54#define init_stack (init_thread_union.stack)
55
56/* how to get the thread information struct from C */
57static inline struct thread_info *current_thread_info(void)
58{
59 return (struct thread_info *) S390_lowcore.thread_info;
60}
61
62void arch_release_task_struct(struct task_struct *tsk);
63
64#define THREAD_SIZE_ORDER THREAD_ORDER
65
66#endif
67
68/*
69 * thread information flags bit numbers
70 */
71#define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
72#define TIF_SIGPENDING 1 /* signal pending */
73#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
74#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
75#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
76#define TIF_SECCOMP 5 /* secure computing */
77#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
78#define TIF_UPROBE 7 /* breakpointed or single-stepping */
79#define TIF_31BIT 16 /* 32bit process */
80#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
81#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
82#define TIF_SINGLE_STEP 19 /* This task is single stepped */
83#define TIF_BLOCK_STEP 20 /* This task is block stepped */
84#define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */
85
86#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
87#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
88#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
89#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
90#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
91#define _TIF_SECCOMP (1<<TIF_SECCOMP)
92#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
93#define _TIF_UPROBE (1<<TIF_UPROBE)
94#define _TIF_31BIT (1<<TIF_31BIT)
95#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
96
97#define is_32bit_task() (test_thread_flag(TIF_31BIT))
98
99#endif /* _ASM_THREAD_INFO_H */