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/processor.h>
35 #include <asm/lowcore.h>
36
37 /*
38 * low level task data that entry.S needs immediate access to
39 * - this struct should fit entirely inside of one cache line
40 * - this struct shares the supervisor stack pages
41 * - if the contents of this structure are changed, the assembly constants must also be changed
42 */
43 struct thread_info {
44 struct task_struct *task; /* main task structure */
45 struct exec_domain *exec_domain; /* execution domain */
46 unsigned long flags; /* low level flags */
47 unsigned int cpu; /* current CPU */
48 int preempt_count; /* 0 => preemptable, <0 => BUG */
49 struct restart_block restart_block;
50 __u64 user_timer;
51 __u64 system_timer;
52 };
53
54 /*
55 * macros/functions for gaining access to the thread information structure
56 */
57 #define INIT_THREAD_INFO(tsk) \
58 { \
59 .task = &tsk, \
60 .exec_domain = &default_exec_domain, \
61 .flags = 0, \
62 .cpu = 0, \
63 .preempt_count = 1, \
64 .restart_block = { \
65 .fn = do_no_restart_syscall, \
66 }, \
67 }
68
69 #define init_thread_info (init_thread_union.thread_info)
70 #define init_stack (init_thread_union.stack)
71
72 /* how to get the thread information struct from C */
current_thread_info(void)73 static inline struct thread_info *current_thread_info(void)
74 {
75 return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
76 }
77
78 #define THREAD_SIZE_ORDER THREAD_ORDER
79
80 #endif
81
82 /*
83 * thread information flags bit numbers
84 */
85 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
86 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
87 #define TIF_SIGPENDING 2 /* signal pending */
88 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
89 #define TIF_RESTART_SVC 4 /* restart svc with new svc number */
90 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
91 #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
92 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */
93 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
94 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
95 TIF_NEED_RESCHED */
96 #define TIF_31BIT 18 /* 32bit process */
97 #define TIF_MEMDIE 19
98 #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */
99 #define TIF_FREEZE 21 /* thread is freezing for suspend */
100
101 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
102 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
103 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
104 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
105 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
106 #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
107 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
108 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
109 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
110 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
111 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
112 #define _TIF_31BIT (1<<TIF_31BIT)
113 #define _TIF_FREEZE (1<<TIF_FREEZE)
114
115 #endif /* __KERNEL__ */
116
117 #define PREEMPT_ACTIVE 0x4000000
118
119 #endif /* _ASM_THREAD_INFO_H */
120