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