Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / include / asm-avr32 / thread_info.h
1 /*
2  * Copyright (C) 2004-2006 Atmel Corporation
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 #ifndef __ASM_AVR32_THREAD_INFO_H
9 #define __ASM_AVR32_THREAD_INFO_H
10
11 #include <asm/page.h>
12
13 #define THREAD_SIZE_ORDER       1
14 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
15
16 #ifndef __ASSEMBLY__
17 #include <asm/types.h>
18
19 struct task_struct;
20 struct exec_domain;
21
22 struct thread_info {
23         struct task_struct      *task;          /* main task structure */
24         struct exec_domain      *exec_domain;   /* execution domain */
25         unsigned long           flags;          /* low level flags */
26         __u32                   cpu;
27         __s32                   preempt_count;  /* 0 => preemptable, <0 => BUG */
28         __u32                   rar_saved;      /* return address... */
29         __u32                   rsr_saved;      /* ...and status register
30                                                    saved by debug handler
31                                                    when setting up
32                                                    trampoline */
33         struct restart_block    restart_block;
34         __u8                    supervisor_stack[0];
35 };
36
37 #define INIT_THREAD_INFO(tsk)                                           \
38 {                                                                       \
39         .task           = &tsk,                                         \
40         .exec_domain    = &default_exec_domain,                         \
41         .flags          = 0,                                            \
42         .cpu            = 0,                                            \
43         .preempt_count  = 1,                                            \
44         .restart_block  = {                                             \
45                 .fn     = do_no_restart_syscall                         \
46         }                                                               \
47 }
48
49 #define init_thread_info        (init_thread_union.thread_info)
50 #define init_stack              (init_thread_union.stack)
51
52 /*
53  * Get the thread information struct from C.
54  * We do the usual trick and use the lower end of the stack for this
55  */
56 static inline struct thread_info *current_thread_info(void)
57 {
58         unsigned long addr = ~(THREAD_SIZE - 1);
59
60         asm("and %0, sp" : "=r"(addr) : "0"(addr));
61         return (struct thread_info *)addr;
62 }
63
64 /* thread information allocation */
65 #define alloc_thread_info(ti) \
66         ((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
67 #define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
68 #define get_thread_info(ti) get_task_struct((ti)->task)
69 #define put_thread_info(ti) put_task_struct((ti)->task)
70
71 #endif /* !__ASSEMBLY__ */
72
73 #define PREEMPT_ACTIVE          0x40000000
74
75 /*
76  * Thread information flags
77  * - these are process state flags that various assembly files may need to access
78  * - pending work-to-be-done flags are in LSW
79  * - other flags in MSW
80  */
81 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
82 #define TIF_SIGPENDING          1       /* signal pending */
83 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
84 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
85                                            TIF_NEED_RESCHED */
86 #define TIF_BREAKPOINT          4       /* enter monitor mode on return */
87 #define TIF_SINGLE_STEP         5       /* single step in progress */
88 #define TIF_MEMDIE              6
89 #define TIF_RESTORE_SIGMASK     7       /* restore signal mask in do_signal */
90 #define TIF_CPU_GOING_TO_SLEEP  8       /* CPU is entering sleep 0 mode */
91 #define TIF_DEBUG               30      /* debugging enabled */
92 #define TIF_USERSPACE           31      /* true if FS sets userspace */
93
94 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
95 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
96 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
97 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
98 #define _TIF_SINGLE_STEP        (1 << TIF_SINGLE_STEP)
99 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
100 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
101 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
102
103 /* Note: The masks below must never span more than 16 bits! */
104
105 /* work to do on interrupt/exception return */
106 #define _TIF_WORK_MASK                          \
107         ((1 << TIF_SIGPENDING)                  \
108          | (1 << TIF_NEED_RESCHED)              \
109          | (1 << TIF_POLLING_NRFLAG)            \
110          | (1 << TIF_BREAKPOINT)                \
111          | (1 << TIF_RESTORE_SIGMASK))
112
113 /* work to do on any return to userspace */
114 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE))
115 /* work to do on return from debug mode */
116 #define _TIF_DBGWORK_MASK       (_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))
117
118 #endif /* __ASM_AVR32_THREAD_INFO_H */