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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  */
44 struct 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 	unsigned int		system_call;
52 	__u64			user_timer;
53 	__u64			system_timer;
54 	unsigned long		last_break;	/* last breaking-event-address. */
55 };
56 
57 /*
58  * macros/functions for gaining access to the thread information structure
59  */
60 #define INIT_THREAD_INFO(tsk)			\
61 {						\
62 	.task		= &tsk,			\
63 	.exec_domain	= &default_exec_domain,	\
64 	.flags		= 0,			\
65 	.cpu		= 0,			\
66 	.preempt_count	= INIT_PREEMPT_COUNT,	\
67 	.restart_block	= {			\
68 		.fn = do_no_restart_syscall,	\
69 	},					\
70 }
71 
72 #define init_thread_info	(init_thread_union.thread_info)
73 #define init_stack		(init_thread_union.stack)
74 
75 /* how to get the thread information struct from C */
current_thread_info(void)76 static inline struct thread_info *current_thread_info(void)
77 {
78 	return (struct thread_info *) S390_lowcore.thread_info;
79 }
80 
81 #define THREAD_SIZE_ORDER THREAD_ORDER
82 
83 #endif
84 
85 /*
86  * thread information flags bit numbers
87  */
88 #define TIF_SYSCALL		0	/* inside a system call */
89 #define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
90 #define TIF_SIGPENDING		2	/* signal pending */
91 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
92 #define TIF_PER_TRAP		6	/* deliver sigtrap on return to user */
93 #define TIF_MCCK_PENDING	7	/* machine check handling is pending */
94 #define TIF_SYSCALL_TRACE	8	/* syscall trace active */
95 #define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
96 #define TIF_SECCOMP		10	/* secure computing */
97 #define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */
98 #define TIF_SIE			12	/* guest execution active */
99 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
100 					   TIF_NEED_RESCHED */
101 #define TIF_31BIT		17	/* 32bit process */
102 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
103 #define TIF_RESTORE_SIGMASK	19	/* restore signal mask in do_signal() */
104 #define TIF_SINGLE_STEP		20	/* This task is single stepped */
105 
106 #define _TIF_SYSCALL		(1<<TIF_SYSCALL)
107 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
108 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
109 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
110 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
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_SINGLE_STEP)
121 
122 #ifdef CONFIG_64BIT
123 #define is_32bit_task()		(test_thread_flag(TIF_31BIT))
124 #else
125 #define is_32bit_task()		(1)
126 #endif
127 
128 #endif /* __KERNEL__ */
129 
130 #define PREEMPT_ACTIVE		0x4000000
131 
132 #endif /* _ASM_THREAD_INFO_H */
133