29b74a10583039b474e3fd941665af8f88fd41e9
[linux-2.6.git] / arch / cris / include / asm / thread_info.h
1 /* thread_info.h: CRIS low-level thread information
2  *
3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
4  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
5  * 
6  * CRIS port by Axis Communications
7  */
8
9 #ifndef _ASM_THREAD_INFO_H
10 #define _ASM_THREAD_INFO_H
11
12 #ifdef __KERNEL__
13
14 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
15
16 #ifndef __ASSEMBLY__
17 #include <asm/types.h>
18 #include <asm/processor.h>
19 #include <arch/thread_info.h>
20 #include <asm/segment.h>
21 #endif
22
23
24 /*
25  * low level task data that entry.S needs immediate access to
26  * - this struct should fit entirely inside of one cache line
27  * - this struct shares the supervisor stack pages
28  * - if the contents of this structure are changed, the assembly constants must also be changed
29  */
30 #ifndef __ASSEMBLY__
31 struct thread_info {
32         struct task_struct      *task;          /* main task structure */
33         struct exec_domain      *exec_domain;   /* execution domain */
34         unsigned long           flags;          /* low level flags */
35         __u32                   cpu;            /* current CPU */
36         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
37         __u32                   tls;            /* TLS for this thread */
38
39         mm_segment_t            addr_limit;     /* thread address space:
40                                                    0-0xBFFFFFFF for user-thead
41                                                    0-0xFFFFFFFF for kernel-thread
42                                                 */
43         struct restart_block    restart_block;
44         __u8                    supervisor_stack[0];
45 };
46
47 #endif
48
49 #define PREEMPT_ACTIVE          0x10000000
50
51 /*
52  * macros/functions for gaining access to the thread information structure
53  */
54 #ifndef __ASSEMBLY__
55 #define INIT_THREAD_INFO(tsk)                           \
56 {                                                       \
57         .task           = &tsk,                         \
58         .exec_domain    = &default_exec_domain,         \
59         .flags          = 0,                            \
60         .cpu            = 0,                            \
61         .preempt_count  = INIT_PREEMPT_COUNT,           \
62         .addr_limit     = KERNEL_DS,                    \
63         .restart_block = {                              \
64                        .fn = do_no_restart_syscall,     \
65         },                                              \
66 }
67
68 #define init_thread_info        (init_thread_union.thread_info)
69
70 /* thread information allocation */
71 #define alloc_thread_info(tsk, node) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
72 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
73
74 #endif /* !__ASSEMBLY__ */
75
76 /*
77  * thread information flags
78  * - these are process state flags that various assembly files may need to access
79  * - pending work-to-be-done flags are in LSW
80  * - other flags in MSW
81  */
82 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
83 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
84 #define TIF_SIGPENDING          2       /* signal pending */
85 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
86 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
87 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
88 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
89 #define TIF_FREEZE              18      /* is freezing for suspend */
90
91 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
92 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
93 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
94 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
95 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
96 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
97 #define _TIF_FREEZE             (1<<TIF_FREEZE)
98
99 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
100 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
101
102 #endif /* __KERNEL__ */
103
104 #endif /* _ASM_THREAD_INFO_H */