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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * include/asm-s390/thread_info.h
3 *
4 * S390 version
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
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#ifndef __SMALL_STACK
19#define THREAD_ORDER 1
20#define ASYNC_ORDER 1
21#else
22#define THREAD_ORDER 0
23#define ASYNC_ORDER 0
24#endif
25#else /* __s390x__ */
26#ifndef __SMALL_STACK
27#define THREAD_ORDER 2
28#define ASYNC_ORDER 2
29#else
30#define THREAD_ORDER 1
31#define ASYNC_ORDER 1
32#endif
33#endif /* __s390x__ */
34
35#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
36#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
37
38#ifndef __ASSEMBLY__
39#include <asm/processor.h>
40#include <asm/lowcore.h>
41
42/*
43 * low level task data that entry.S needs immediate access to
44 * - this struct should fit entirely inside of one cache line
45 * - this struct shares the supervisor stack pages
46 * - if the contents of this structure are changed, the assembly constants must also be changed
47 */
48struct thread_info {
49 struct task_struct *task; /* main task structure */
50 struct exec_domain *exec_domain; /* execution domain */
51 unsigned long flags; /* low level flags */
52 unsigned int cpu; /* current CPU */
Jesper Juhldcd497f2005-06-23 00:09:07 -070053 int preempt_count; /* 0 => preemptable, <0 => BUG */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct restart_block restart_block;
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 .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 *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
78}
79
80/* thread information allocation */
81#define alloc_thread_info(tsk) ((struct thread_info *) \
82 __get_free_pages(GFP_KERNEL,THREAD_ORDER))
83#define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER)
84#define get_thread_info(ti) get_task_struct((ti)->task)
85#define put_thread_info(ti) put_task_struct((ti)->task)
86
87#endif
88
89/*
90 * thread information flags bit numbers
91 */
92#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
93#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
94#define TIF_SIGPENDING 2 /* signal pending */
95#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
96#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
97#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
98#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
Heiko Carstens77fa2242005-06-25 14:55:30 -070099#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
101#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
102 TIF_NEED_RESCHED */
103#define TIF_31BIT 18 /* 32bit process */
104#define TIF_MEMDIE 19
105
106#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
107#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
112#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
Heiko Carstens77fa2242005-06-25 14:55:30 -0700113#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#define _TIF_USEDFPU (1<<TIF_USEDFPU)
115#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
116#define _TIF_31BIT (1<<TIF_31BIT)
117
118#endif /* __KERNEL__ */
119
120#define PREEMPT_ACTIVE 0x4000000
121
122#endif /* _ASM_THREAD_INFO_H */