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#ifndef CONFIG_64BIT
14#define THREAD_ORDER 1
15#define ASYNC_ORDER 1
16#else /* CONFIG_64BIT */
17#define THREAD_ORDER 2
18#define ASYNC_ORDER 2
19#endif /* CONFIG_64BIT */
20
21#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
22#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
23
24#ifndef __ASSEMBLY__
25#include <asm/lowcore.h>
26#include <asm/page.h>
27#include <asm/processor.h>
28
29/*
30 * low level task data that entry.S needs immediate access to
31 * - this struct should fit entirely inside of one cache line
32 * - this struct shares the supervisor stack pages
33 * - if the contents of this structure are changed, the assembly constants must also be changed
34 */
35struct thread_info {
36 struct task_struct *task; /* main task structure */
37 struct exec_domain *exec_domain; /* execution domain */
38 unsigned long flags; /* low level flags */
39 unsigned long sys_call_table; /* System call table address */
40 unsigned int cpu; /* current CPU */
41 int preempt_count; /* 0 => preemptable, <0 => BUG */
42 struct restart_block restart_block;
43 unsigned int system_call;
44 __u64 user_timer;
45 __u64 system_timer;
46 unsigned long last_break; /* last breaking-event-address. */
47};
48
49/*
50 * macros/functions for gaining access to the thread information structure
51 */
52#define INIT_THREAD_INFO(tsk) \
53{ \
54 .task = &tsk, \
55 .exec_domain = &default_exec_domain, \
56 .flags = 0, \
57 .cpu = 0, \
58 .preempt_count = INIT_PREEMPT_COUNT, \
59 .restart_block = { \
60 .fn = do_no_restart_syscall, \
61 }, \
62}
63
64#define init_thread_info (init_thread_union.thread_info)
65#define init_stack (init_thread_union.stack)
66
67/* how to get the thread information struct from C */
68static inline struct thread_info *current_thread_info(void)
69{
70 return (struct thread_info *) S390_lowcore.thread_info;
71}
72
73#define THREAD_SIZE_ORDER THREAD_ORDER
74
75#endif
76
77/*
78 * thread information flags bit numbers
79 */
80#define TIF_NOTIFY_RESUME 0 /* callback before returning to user */
81#define TIF_SIGPENDING 1 /* signal pending */
82#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
83#define TIF_SYSCALL_TRACE 3 /* syscall trace active */
84#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
85#define TIF_SECCOMP 5 /* secure computing */
86#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
87#define TIF_31BIT 16 /* 32bit process */
88#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
89#define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */
90#define TIF_SINGLE_STEP 19 /* This task is single stepped */
91#define TIF_BLOCK_STEP 20 /* This task is block stepped */
92
93#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
94#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
95#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
96#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
97#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
98#define _TIF_SECCOMP (1<<TIF_SECCOMP)
99#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
100#define _TIF_31BIT (1<<TIF_31BIT)
101#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
102
103#ifdef CONFIG_64BIT
104#define is_32bit_task() (test_thread_flag(TIF_31BIT))
105#else
106#define is_32bit_task() (1)
107#endif
108
109#endif /* _ASM_THREAD_INFO_H */