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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 #include <linux/const.h>
11 
12 /*
13  * Size of kernel stack for each process
14  */
15 #define THREAD_ORDER 2
16 #define ASYNC_ORDER  2
17 
18 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
19 #define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)
20 
21 #ifndef __ASSEMBLY__
22 #include <asm/lowcore.h>
23 #include <asm/page.h>
24 #include <asm/processor.h>
25 
26 /*
27  * low level task data that entry.S needs immediate access to
28  * - this struct should fit entirely inside of one cache line
29  * - this struct shares the supervisor stack pages
30  * - if the contents of this structure are changed, the assembly constants must also be changed
31  */
32 struct thread_info {
33 	struct task_struct	*task;		/* main task structure */
34 	unsigned long		flags;		/* low level flags */
35 	unsigned long		sys_call_table;	/* System call table address */
36 	unsigned int		cpu;		/* current CPU */
37 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
38 	unsigned int		system_call;
39 	__u64			user_timer;
40 	__u64			system_timer;
41 	unsigned long		last_break;	/* last breaking-event-address. */
42 };
43 
44 /*
45  * macros/functions for gaining access to the thread information structure
46  */
47 #define INIT_THREAD_INFO(tsk)			\
48 {						\
49 	.task		= &tsk,			\
50 	.flags		= 0,			\
51 	.cpu		= 0,			\
52 	.preempt_count	= INIT_PREEMPT_COUNT,	\
53 }
54 
55 #define init_thread_info	(init_thread_union.thread_info)
56 #define init_stack		(init_thread_union.stack)
57 
58 /* how to get the thread information struct from C */
current_thread_info(void)59 static inline struct thread_info *current_thread_info(void)
60 {
61 	return (struct thread_info *) S390_lowcore.thread_info;
62 }
63 
64 void arch_release_task_struct(struct task_struct *tsk);
65 
66 #define THREAD_SIZE_ORDER THREAD_ORDER
67 
68 #endif
69 
70 /*
71  * thread information flags bit numbers
72  */
73 #define TIF_NOTIFY_RESUME	0	/* callback before returning to user */
74 #define TIF_SIGPENDING		1	/* signal pending */
75 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
76 #define TIF_SYSCALL_TRACE	3	/* syscall trace active */
77 #define TIF_SYSCALL_AUDIT	4	/* syscall auditing active */
78 #define TIF_SECCOMP		5	/* secure computing */
79 #define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
80 #define TIF_UPROBE		7	/* breakpointed or single-stepping */
81 #define TIF_ISOLATE_BP		8	/* Run process with isolated BP */
82 #define TIF_ISOLATE_BP_GUEST	9	/* Run KVM guests with isolated BP */
83 #define TIF_31BIT		16	/* 32bit process */
84 #define TIF_MEMDIE		17	/* is terminating due to OOM killer */
85 #define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal() */
86 #define TIF_SINGLE_STEP		19	/* This task is single stepped */
87 #define TIF_BLOCK_STEP		20	/* This task is block stepped */
88 #define TIF_UPROBE_SINGLESTEP	21	/* This task is uprobe single stepped */
89 
90 #define _TIF_NOTIFY_RESUME	_BITUL(TIF_NOTIFY_RESUME)
91 #define _TIF_SIGPENDING		_BITUL(TIF_SIGPENDING)
92 #define _TIF_NEED_RESCHED	_BITUL(TIF_NEED_RESCHED)
93 #define _TIF_SYSCALL_TRACE	_BITUL(TIF_SYSCALL_TRACE)
94 #define _TIF_SYSCALL_AUDIT	_BITUL(TIF_SYSCALL_AUDIT)
95 #define _TIF_SECCOMP		_BITUL(TIF_SECCOMP)
96 #define _TIF_SYSCALL_TRACEPOINT	_BITUL(TIF_SYSCALL_TRACEPOINT)
97 #define _TIF_UPROBE		_BITUL(TIF_UPROBE)
98 #define _TIF_ISOLATE_BP		_BITUL(TIF_ISOLATE_BP)
99 #define _TIF_ISOLATE_BP_GUEST	_BITUL(TIF_ISOLATE_BP_GUEST)
100 #define _TIF_31BIT		_BITUL(TIF_31BIT)
101 #define _TIF_SINGLE_STEP	_BITUL(TIF_SINGLE_STEP)
102 
103 #define is_32bit_task()		(test_thread_flag(TIF_31BIT))
104 
105 #endif /* _ASM_THREAD_INFO_H */
106