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1/*
2 * include/asm-s390/thread_info.h
3 *
4 * S390 version
5 * Copyright (C) IBM Corp. 2002,2006
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#ifndef _ASM_THREAD_INFO_H
10#define _ASM_THREAD_INFO_H
11
12/*
13 * Size of kernel stack for each process
14 */
15#ifndef CONFIG_64BIT
16#define THREAD_ORDER 1
17#define ASYNC_ORDER 1
18#else /* CONFIG_64BIT */
19#ifndef __SMALL_STACK
20#define THREAD_ORDER 2
21#define ASYNC_ORDER 2
22#else
23#define THREAD_ORDER 1
24#define ASYNC_ORDER 1
25#endif
26#endif /* CONFIG_64BIT */
27
28#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
29#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
30
31#ifndef __ASSEMBLY__
32#include <asm/lowcore.h>
33#include <asm/page.h>
34#include <asm/processor.h>
35
36/*
37 * low level task data that entry.S needs immediate access to
38 * - this struct should fit entirely inside of one cache line
39 * - this struct shares the supervisor stack pages
40 * - if the contents of this structure are changed, the assembly constants must also be changed
41 */
42struct thread_info {
43 struct task_struct *task; /* main task structure */
44 struct exec_domain *exec_domain; /* execution domain */
45 unsigned long flags; /* low level flags */
46 unsigned int cpu; /* current CPU */
47 int preempt_count; /* 0 => preemptable, <0 => BUG */
48 struct restart_block restart_block;
49 unsigned int system_call;
50 __u64 user_timer;
51 __u64 system_timer;
52 unsigned long last_break; /* last breaking-event-address. */
53};
54
55/*
56 * macros/functions for gaining access to the thread information structure
57 */
58#define INIT_THREAD_INFO(tsk) \
59{ \
60 .task = &tsk, \
61 .exec_domain = &default_exec_domain, \
62 .flags = 0, \
63 .cpu = 0, \
64 .preempt_count = INIT_PREEMPT_COUNT, \
65 .restart_block = { \
66 .fn = do_no_restart_syscall, \
67 }, \
68}
69
70#define init_thread_info (init_thread_union.thread_info)
71#define init_stack (init_thread_union.stack)
72
73/* how to get the thread information struct from C */
74static inline struct thread_info *current_thread_info(void)
75{
76 return (struct thread_info *) S390_lowcore.thread_info;
77}
78
79#define THREAD_SIZE_ORDER THREAD_ORDER
80
81#endif
82
83/*
84 * thread information flags bit numbers
85 */
86#define TIF_SYSCALL 0 /* inside a system call */
87#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
88#define TIF_SIGPENDING 2 /* signal pending */
89#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
90#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
91#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
92#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
93#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
94#define TIF_SECCOMP 10 /* secure computing */
95#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
96#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
97 TIF_NEED_RESCHED */
98#define TIF_31BIT 17 /* 32bit process */
99#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
100#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */
101#define TIF_SINGLE_STEP 20 /* This task is single stepped */
102
103#define _TIF_SYSCALL (1<<TIF_SYSCALL)
104#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
105#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
106#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
107#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
108#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
109#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
110#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
111#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
112#define _TIF_SECCOMP (1<<TIF_SECCOMP)
113#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
114#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
115#define _TIF_31BIT (1<<TIF_31BIT)
116#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
117
118#ifdef CONFIG_64BIT
119#define is_32bit_task() (test_thread_flag(TIF_31BIT))
120#else
121#define is_32bit_task() (1)
122#endif
123
124#define PREEMPT_ACTIVE 0x4000000
125
126#endif /* _ASM_THREAD_INFO_H */