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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#ifdef __KERNEL__
13
14/*
15 * Size of kernel stack for each process
16 */
17#ifndef __s390x__
18#define THREAD_ORDER 1
19#define ASYNC_ORDER 1
20#else /* __s390x__ */
21#ifndef __SMALL_STACK
22#define THREAD_ORDER 2
23#define ASYNC_ORDER 2
24#else
25#define THREAD_ORDER 1
26#define ASYNC_ORDER 1
27#endif
28#endif /* __s390x__ */
29
30#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
31#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
32
33#ifndef __ASSEMBLY__
34#include <asm/lowcore.h>
35#include <asm/page.h>
36#include <asm/processor.h>
37
38/*
39 * low level task data that entry.S needs immediate access to
40 * - this struct should fit entirely inside of one cache line
41 * - this struct shares the supervisor stack pages
42 * - if the contents of this structure are changed, the assembly constants must also be changed
43 */
44struct thread_info {
45 struct task_struct *task; /* main task structure */
46 struct exec_domain *exec_domain; /* execution domain */
47 unsigned long flags; /* low level flags */
48 unsigned int cpu; /* current CPU */
49 int preempt_count; /* 0 => preemptable, <0 => BUG */
50 struct restart_block restart_block;
51 __u64 user_timer;
52 __u64 system_timer;
53 unsigned long last_break; /* last breaking-event-address. */
54};
55
56/*
57 * macros/functions for gaining access to the thread information structure
58 */
59#define INIT_THREAD_INFO(tsk) \
60{ \
61 .task = &tsk, \
62 .exec_domain = &default_exec_domain, \
63 .flags = 0, \
64 .cpu = 0, \
65 .preempt_count = INIT_PREEMPT_COUNT, \
66 .restart_block = { \
67 .fn = do_no_restart_syscall, \
68 }, \
69}
70
71#define init_thread_info (init_thread_union.thread_info)
72#define init_stack (init_thread_union.stack)
73
74/* how to get the thread information struct from C */
75static inline struct thread_info *current_thread_info(void)
76{
77 return (struct thread_info *) S390_lowcore.thread_info;
78}
79
80#define THREAD_SIZE_ORDER THREAD_ORDER
81
82#endif
83
84/*
85 * thread information flags bit numbers
86 */
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_RESTART_SVC 4 /* restart svc with new svc number */
91#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
92#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
93#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
94#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
95#define TIF_SECCOMP 10 /* secure computing */
96#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
97#define TIF_SIE 12 /* guest execution active */
98#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
99 TIF_NEED_RESCHED */
100#define TIF_31BIT 17 /* 32bit process */
101#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
102#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */
103#define TIF_SINGLE_STEP 20 /* This task is single stepped */
104#define TIF_FREEZE 21 /* thread is freezing for suspend */
105
106#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
107#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
108#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
109#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
110#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
111#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
112#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
113#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
114#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
115#define _TIF_SECCOMP (1<<TIF_SECCOMP)
116#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
117#define _TIF_SIE (1<<TIF_SIE)
118#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
119#define _TIF_31BIT (1<<TIF_31BIT)
120#define _TIF_SINGLE_STEP (1<<TIF_FREEZE)
121#define _TIF_FREEZE (1<<TIF_FREEZE)
122
123#ifdef CONFIG_64BIT
124#define is_32bit_task() (test_thread_flag(TIF_31BIT))
125#else
126#define is_32bit_task() (1)
127#endif
128
129#endif /* __KERNEL__ */
130
131#define PREEMPT_ACTIVE 0x4000000
132
133#endif /* _ASM_THREAD_INFO_H */