summaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/thread_info.h
blob: a73038155e0d05fddf2ff3e0a155eb320dbee9e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 *  include/asm-s390/thread_info.h
 *
 *  S390 version
 *    Copyright (C) IBM Corp. 2002,2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

/*
 * Size of kernel stack for each process
 */
#ifndef __s390x__
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#else /* __s390x__ */
#ifndef __SMALL_STACK
#define THREAD_ORDER 2
#define ASYNC_ORDER  2
#else
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#endif
#endif /* __s390x__ */

#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
#define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)

#ifndef __ASSEMBLY__
#include <asm/lowcore.h>
#include <asm/page.h>
#include <asm/processor.h>

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants must also be changed
 */
struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	unsigned int		cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
	struct restart_block	restart_block;
	unsigned int		system_call;
	__u64			user_timer;
	__u64			system_timer;
	unsigned long		last_break;	/* last breaking-event-address. */
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.restart_block	= {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *) S390_lowcore.thread_info;
}

#define THREAD_SIZE_ORDER THREAD_ORDER

#endif

/*
 * thread information flags bit numbers
 */
#define TIF_SYSCALL		0	/* inside a system call */
#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_PER_TRAP		6	/* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING	7	/* machine check handling is pending */
#define TIF_SYSCALL_TRACE	8	/* syscall trace active */
#define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
#define TIF_SECCOMP		10	/* secure computing */
#define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */
#define TIF_SIE			12	/* guest execution active */
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_31BIT		17	/* 32bit process */
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK	19	/* restore signal mask in do_signal() */
#define TIF_SINGLE_STEP		20	/* This task is single stepped */

#define _TIF_SYSCALL		(1<<TIF_SYSCALL)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_PER_TRAP		(1<<TIF_PER_TRAP)
#define _TIF_MCCK_PENDING	(1<<TIF_MCCK_PENDING)
#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_SIE		(1<<TIF_SIE)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT		(1<<TIF_31BIT)
#define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)

#ifdef CONFIG_64BIT
#define is_32bit_task()		(test_thread_flag(TIF_31BIT))
#else
#define is_32bit_task()		(1)
#endif

#endif /* __KERNEL__ */

#define PREEMPT_ACTIVE		0x4000000

#endif /* _ASM_THREAD_INFO_H */