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[linux-2.6.git] / include / asm-frv / thread_info.h
1 /* thread_info.h: description
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  * Derived from include/asm-i386/thread_info.h
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12
13 #ifndef _ASM_THREAD_INFO_H
14 #define _ASM_THREAD_INFO_H
15
16 #ifdef __KERNEL__
17
18 #ifndef __ASSEMBLY__
19 #include <asm/processor.h>
20 #endif
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
30 struct thread_info {
31         struct task_struct      *task;          /* main task structure */
32         struct exec_domain      *exec_domain;   /* execution domain */
33         unsigned long           flags;          /* low level flags */
34         unsigned long           status;         /* thread-synchronous flags */
35         __u32                   cpu;            /* current CPU */
36         __s32                   preempt_count;  /* 0 => preemptable, <0 => BUG */
37
38         mm_segment_t            addr_limit;     /* thread address space:
39                                                    0-0xBFFFFFFF for user-thead
40                                                    0-0xFFFFFFFF for kernel-thread
41                                                 */
42         struct restart_block    restart_block;
43
44         __u8                    supervisor_stack[0];
45 };
46
47 #else /* !__ASSEMBLY__ */
48
49 /* offsets into the thread_info struct for assembly code access */
50 #define TI_TASK                 0x00000000
51 #define TI_EXEC_DOMAIN          0x00000004
52 #define TI_FLAGS                0x00000008
53 #define TI_STATUS               0x0000000C
54 #define TI_CPU                  0x00000010
55 #define TI_PRE_COUNT            0x00000014
56 #define TI_ADDR_LIMIT           0x00000018
57 #define TI_RESTART_BLOCK        0x0000001C
58
59 #endif
60
61 #define PREEMPT_ACTIVE          0x4000000
62
63 /*
64  * macros/functions for gaining access to the thread information structure
65  *
66  * preempt_count needs to be 1 initially, until the scheduler is functional.
67  */
68 #ifndef __ASSEMBLY__
69
70 #define INIT_THREAD_INFO(tsk)                   \
71 {                                               \
72         .task           = &tsk,                 \
73         .exec_domain    = &default_exec_domain, \
74         .flags          = 0,                    \
75         .cpu            = 0,                    \
76         .preempt_count  = 1,                    \
77         .addr_limit     = KERNEL_DS,            \
78         .restart_block = {                      \
79                 .fn = do_no_restart_syscall,    \
80         },                                      \
81 }
82
83 #define init_thread_info        (init_thread_union.thread_info)
84 #define init_stack              (init_thread_union.stack)
85
86 #ifdef CONFIG_SMALL_TASKS
87 #define THREAD_SIZE             4096
88 #else
89 #define THREAD_SIZE             8192
90 #endif
91
92 /* how to get the thread information struct from C */
93 register struct thread_info *__current_thread_info asm("gr15");
94
95 #define current_thread_info() ({ __current_thread_info; })
96
97 /* thread information allocation */
98 #ifdef CONFIG_DEBUG_STACK_USAGE
99 #define alloc_thread_info(tsk)                                  \
100         ({                                                      \
101                 struct thread_info *ret;                        \
102                                                                 \
103                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
104                 if (ret)                                        \
105                         memset(ret, 0, THREAD_SIZE);            \
106                 ret;                                            \
107         })
108 #else
109 #define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
110 #endif
111
112 #define free_thread_info(info)  kfree(info)
113 #define get_thread_info(ti)     get_task_struct((ti)->task)
114 #define put_thread_info(ti)     put_task_struct((ti)->task)
115
116 #else /* !__ASSEMBLY__ */
117
118 #define THREAD_SIZE     8192
119
120 #endif
121
122 /*
123  * thread information flags
124  * - these are process state flags that various assembly files may need to access
125  * - pending work-to-be-done flags are in LSW
126  * - other flags in MSW
127  */
128 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
129 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
130 #define TIF_SIGPENDING          2       /* signal pending */
131 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
132 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
133 #define TIF_IRET                5       /* return with iret */
134 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
135 #define TIF_MEMDIE              17      /* OOM killer killed process */
136
137 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
138 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
139 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
140 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
141 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
142 #define _TIF_IRET               (1 << TIF_IRET)
143 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
144
145 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
146 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
147
148 /*
149  * Thread-synchronous status.
150  *
151  * This is different from the flags in that nobody else
152  * ever touches our thread-synchronous status, so we don't
153  * have to worry about atomic accesses.
154  */
155 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
156
157 #endif /* __KERNEL__ */
158
159 #endif /* _ASM_THREAD_INFO_H */