1a9e6ae0c5fd55e1324aad120a50016e4c1c6fb0
[linux-2.6.git] / include / asm-v850 / thread_info.h
1 /*
2  * include/asm-v850/thread_info.h -- v850 low-level thread information
3  *
4  *  Copyright (C) 2002  NEC Corporation
5  *  Copyright (C) 2002  Miles Bader <miles@gnu.org>
6  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
7  *    - Incorporating suggestions made by Linus Torvalds and Dave Miller
8  *
9  * This file is subject to the terms and conditions of the GNU General
10  * Public License.  See the file COPYING in the main directory of this
11  * archive for more details.
12  *
13  * This file was derived from the PPC version, include/asm-ppc/thread_info.h
14  * which was adapted from the i386 version by Paul Mackerras
15  */
16
17 #ifndef __V850_THREAD_INFO_H__
18 #define __V850_THREAD_INFO_H__
19
20 #ifdef __KERNEL__
21
22 #ifndef __ASSEMBLY__
23
24 /*
25  * low level task data.
26  * If you change this, change the TI_* offsets below to match.
27  */
28 struct thread_info {
29         struct task_struct      *task;          /* main task structure */
30         struct exec_domain      *exec_domain;   /* execution domain */
31         unsigned long           flags;          /* low level flags */
32         int                     cpu;            /* cpu we're on */
33         int                     preempt_count;  /* 0 => preemptable,
34                                                    <0 => BUG */
35         struct restart_block    restart_block;
36 };
37
38 #define INIT_THREAD_INFO(tsk)                                                 \
39 {                                                                             \
40         .task =         &tsk,                                                 \
41         .exec_domain =  &default_exec_domain,                                 \
42         .flags =        0,                                                    \
43         .cpu =          0,                                                    \
44         .preempt_count = 1,                                                   \
45         .restart_block = {                                                    \
46                 .fn = do_no_restart_syscall,                                  \
47         },                                                                    \
48 }
49
50 #define init_thread_info        (init_thread_union.thread_info)
51 #define init_stack              (init_thread_union.stack)
52
53 /*
54  * macros/functions for gaining access to the thread information structure
55  */
56
57 /* thread information allocation */
58 #define alloc_thread_info(tsk) ((struct thread_info *) \
59                                 __get_free_pages(GFP_KERNEL, 1))
60 #define free_thread_info(ti)    free_pages((unsigned long) (ti), 1)
61
62 #endif /* __ASSEMBLY__ */
63
64
65 /*
66  * Offsets in thread_info structure, used in assembly code
67  */
68 #define TI_TASK         0
69 #define TI_EXECDOMAIN   4
70 #define TI_FLAGS        8
71 #define TI_CPU          12
72 #define TI_PREEMPT      16
73
74 #define PREEMPT_ACTIVE          0x4000000
75
76 /*
77  * thread information flag bit numbers
78  */
79 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
80 #define TIF_SIGPENDING          1       /* signal pending */
81 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
82 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
83                                            TIF_NEED_RESCHED */
84 #define TIF_MEMDIE              4
85
86 /* as above, but as bit values */
87 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
88 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
89 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
90 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
91
92
93 /* Size of kernel stack for each process.  */
94 #define THREAD_SIZE             0x2000
95
96 /* The alignment of kernel threads, with thread_info structures at their
97    base.  Thus, a pointer for a task's task structure can be derived from
98    its kernel stack pointer.  */
99 #define THREAD_ALIGNMENT        THREAD_SIZE
100 #define THREAD_MASK             (-THREAD_ALIGNMENT)
101
102
103 #ifdef __ASSEMBLY__
104
105 /* Put a pointer to the current thread_info structure into REG.  Note that
106    this definition requires THREAD_MASK to be representable as a signed
107    16-bit value.  */
108 #define GET_CURRENT_THREAD(reg)                                         \
109         /* Use `addi' and then `and' instead of just `andi', because    \
110            `addi' sign-extends the immediate value, whereas `andi'      \
111            zero-extends it.  */                                         \
112         addi    THREAD_MASK, r0, reg;                                   \
113         and     sp, reg
114
115 #else
116
117 /* Return a pointer to the current thread_info structure.  */
118 static inline struct thread_info *current_thread_info (void)
119 {
120         register unsigned long sp __asm__ ("sp");
121         return (struct thread_info *)(sp & THREAD_MASK);
122 }
123
124 #endif /* __ASSEMBLY__ */
125
126
127 #endif /* __KERNEL__ */
128
129 #endif /* __V850_THREAD_INFO_H__ */