0c9bc095f3f0bc3cae753f788f72786a67b96512
[linux-2.6.git] / arch / m68knommu / include / asm / thread_info.h
1 /* thread_info.h: m68knommu low-level thread information
2  * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com)
3  *
4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
6  */
7
8 #ifndef _ASM_THREAD_INFO_H
9 #define _ASM_THREAD_INFO_H
10
11 #include <asm/page.h>
12
13 #ifdef __KERNEL__
14
15 #ifndef __ASSEMBLY__
16
17 /*
18  * Size of kernel stack for each process. This must be a power of 2...
19  */
20 #ifdef CONFIG_4KSTACKS
21 #define THREAD_SIZE_ORDER (0)
22 #else
23 #define THREAD_SIZE_ORDER (1)
24 #endif
25                                                                                 
26 /*
27  * for asm files, THREAD_SIZE is now generated by asm-offsets.c
28  */
29 #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)
30
31 /*
32  * low level task data.
33  */
34 struct thread_info {
35         struct task_struct *task;               /* main task structure */
36         struct exec_domain *exec_domain;        /* execution domain */
37         unsigned long      flags;               /* low level flags */
38         int                cpu;                 /* cpu we're on */
39         int                preempt_count;       /* 0 => preemptable, <0 => BUG */
40         struct restart_block restart_block;
41 };
42
43 /*
44  * macros/functions for gaining access to the thread information structure
45  */
46 #define INIT_THREAD_INFO(tsk)                   \
47 {                                               \
48         .task           = &tsk,                 \
49         .exec_domain    = &default_exec_domain, \
50         .flags          = 0,                    \
51         .cpu            = 0,                    \
52         .restart_block  = {                     \
53                 .fn = do_no_restart_syscall,    \
54         },                                      \
55 }
56
57 #define init_thread_info        (init_thread_union.thread_info)
58 #define init_stack              (init_thread_union.stack)
59
60
61 /* how to get the thread information struct from C */
62 static inline struct thread_info *current_thread_info(void)
63 {
64         struct thread_info *ti;
65         __asm__(
66                 "move.l %%sp, %0 \n\t"
67                 "and.l  %1, %0"
68                 : "=&d"(ti)
69                 : "di" (~(THREAD_SIZE-1))
70                 );
71         return ti;
72 }
73
74 #endif /* __ASSEMBLY__ */
75
76 #define PREEMPT_ACTIVE  0x4000000
77
78 /*
79  * thread information flag bit numbers
80  */
81 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
82 #define TIF_SIGPENDING          1       /* signal pending */
83 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
84 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
85                                            TIF_NEED_RESCHED */
86 #define TIF_MEMDIE              4
87
88 /* as above, but as bit values */
89 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
90 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
91 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
92 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
93
94 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
95
96 #endif /* __KERNEL__ */
97
98 #endif /* _ASM_THREAD_INFO_H */