/spare/repo/netdev-2.6 branch 'master'
[linux-2.6/verdex.git] / include / asm-s390 / thread_info.h
blob6c18a3f24316ad69defc3f680edefe695702fca7
1 /*
2 * include/asm-s390/thread_info.h
4 * S390 version
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
9 #ifndef _ASM_THREAD_INFO_H
10 #define _ASM_THREAD_INFO_H
12 #ifdef __KERNEL__
15 * Size of kernel stack for each process
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__ */
35 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
36 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
38 #ifndef __ASSEMBLY__
39 #include <asm/processor.h>
40 #include <asm/lowcore.h>
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
48 struct 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 */
53 int preempt_count; /* 0 => preemptable, <0 => BUG */
54 struct restart_block restart_block;
58 * macros/functions for gaining access to the thread information structure
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 }, \
71 #define init_thread_info (init_thread_union.thread_info)
72 #define init_stack (init_thread_union.stack)
74 /* how to get the thread information struct from C */
75 static inline struct thread_info *current_thread_info(void)
77 return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
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)
87 #endif
90 * thread information flags bit numbers
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 */
99 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */
100 #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
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)
113 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
114 #define _TIF_USEDFPU (1<<TIF_USEDFPU)
115 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
116 #define _TIF_31BIT (1<<TIF_31BIT)
118 #endif /* __KERNEL__ */
120 #define PREEMPT_ACTIVE 0x4000000
122 #endif /* _ASM_THREAD_INFO_H */