884776f686cacf4159699a00953e4203ee0e8537
[linux-2.6.git] / arch / m68k / include / asm / thread_info_no.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 /*
16  * Size of kernel stack for each process. This must be a power of 2...
17  */
18 #ifdef CONFIG_4KSTACKS
19 #define THREAD_SIZE_ORDER (0)
20 #else
21 #define THREAD_SIZE_ORDER (1)
22 #endif
23                                                                                 
24 /*
25  * for asm files, THREAD_SIZE is now generated by asm-offsets.c
26  */
27 #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)
28
29 #ifndef __ASSEMBLY__
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         unsigned long      tp_value;            /* thread pointer */
41         struct restart_block restart_block;
42 };
43
44 /*
45  * macros/functions for gaining access to the thread information structure
46  */
47 #define INIT_THREAD_INFO(tsk)                   \
48 {                                               \
49         .task           = &tsk,                 \
50         .exec_domain    = &default_exec_domain, \
51         .flags          = 0,                    \
52         .cpu            = 0,                    \
53         .preempt_count  = INIT_PREEMPT_COUNT,   \
54         .restart_block  = {                     \
55                 .fn = do_no_restart_syscall,    \
56         },                                      \
57 }
58
59 #define init_thread_info        (init_thread_union.thread_info)
60 #define init_stack              (init_thread_union.stack)
61
62
63 /* how to get the thread information struct from C */
64 static inline struct thread_info *current_thread_info(void)
65 {
66         struct thread_info *ti;
67         __asm__(
68                 "move.l %%sp, %0 \n\t"
69                 "and.l  %1, %0"
70                 : "=&d"(ti)
71                 : "di" (~(THREAD_SIZE-1))
72                 );
73         return ti;
74 }
75
76 #endif /* __ASSEMBLY__ */
77
78 #define PREEMPT_ACTIVE  0x4000000
79
80 /*
81  * thread information flag bit numbers
82  */
83 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
84 #define TIF_SIGPENDING          1       /* signal pending */
85 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
86 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
87                                            TIF_NEED_RESCHED */
88 #define TIF_MEMDIE              4
89 #define TIF_FREEZE              16      /* is freezing for suspend */
90
91 /* as above, but as bit values */
92 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
93 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
94 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
95 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
96 #define _TIF_FREEZE             (1<<TIF_FREEZE)
97
98 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
99
100 #endif /* __KERNEL__ */
101
102 #endif /* _ASM_THREAD_INFO_H */