[PATCH] CRIS update: updates for 2.6.12
[linux-2.6.git] / include / asm-cris / 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 #ifndef __ASSEMBLY__
15 #include <asm/types.h>
16 #include <asm/processor.h>
17 #include <asm/arch/thread_info.h>
18 #include <asm/segment.h>
19 #endif
20
21
22 /*
23  * low level task data that entry.S needs immediate access to
24  * - this struct should fit entirely inside of one cache line
25  * - this struct shares the supervisor stack pages
26  * - if the contents of this structure are changed, the assembly constants must also be changed
27  */
28 #ifndef __ASSEMBLY__
29 struct thread_info {
30         struct task_struct      *task;          /* main task structure */
31         struct exec_domain      *exec_domain;   /* execution domain */
32         unsigned long           flags;          /* low level flags */
33         __u32                   cpu;            /* current CPU */
34         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
35
36         mm_segment_t            addr_limit;     /* thread address space:
37                                                    0-0xBFFFFFFF for user-thead
38                                                    0-0xFFFFFFFF for kernel-thread
39                                                 */
40         struct restart_block    restart_block;
41         __u8                    supervisor_stack[0];
42 };
43
44 #endif
45
46 #define PREEMPT_ACTIVE          0x10000000
47
48 /*
49  * macros/functions for gaining access to the thread information structure
50  *
51  * preempt_count needs to be 1 initially, until the scheduler is functional.
52  */
53 #ifndef __ASSEMBLY__
54 #define INIT_THREAD_INFO(tsk)                           \
55 {                                                       \
56         .task           = &tsk,                         \
57         .exec_domain    = &default_exec_domain,         \
58         .flags          = 0,                            \
59         .cpu            = 0,                            \
60         .preempt_count  = 1,                            \
61         .addr_limit     = KERNEL_DS,                    \
62         .restart_block = {                              \
63                        .fn = do_no_restart_syscall,     \
64         },                                              \
65 }
66
67 #define init_thread_info        (init_thread_union.thread_info)
68
69 /* thread information allocation */
70 #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
71 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
72 #define get_thread_info(ti) get_task_struct((ti)->task)
73 #define put_thread_info(ti) put_task_struct((ti)->task)
74
75 #endif /* !__ASSEMBLY__ */
76
77 /*
78  * thread information flags
79  * - these are process state flags that various assembly files may need to access
80  * - pending work-to-be-done flags are in LSW
81  * - other flags in MSW
82  */
83 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
84 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
85 #define TIF_SIGPENDING          2       /* signal pending */
86 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
87 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
88 #define TIF_MEMDIE              17
89
90 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
91 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
92 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
93 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
94 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
95
96 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
97 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
98
99 #endif /* __KERNEL__ */
100
101 #endif /* _ASM_THREAD_INFO_H */