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