60c83abfde7027832e0e7609ac7e032accb66386
[linux-2.6.git] / arch / alpha / include / asm / thread_info.h
1 #ifndef _ALPHA_THREAD_INFO_H
2 #define _ALPHA_THREAD_INFO_H
3
4 #ifdef __KERNEL__
5
6 #ifndef __ASSEMBLY__
7 #include <asm/processor.h>
8 #include <asm/types.h>
9 #include <asm/hwrpb.h>
10 #endif
11
12 #ifndef __ASSEMBLY__
13 struct thread_info {
14         struct pcb_struct       pcb;            /* palcode state */
15
16         struct task_struct      *task;          /* main task structure */
17         unsigned int            flags;          /* low level flags */
18         unsigned int            ieee_state;     /* see fpu.h */
19
20         struct exec_domain      *exec_domain;   /* execution domain */
21         mm_segment_t            addr_limit;     /* thread address space */
22         unsigned                cpu;            /* current CPU */
23         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
24
25         int bpt_nsaved;
26         unsigned long bpt_addr[2];              /* breakpoint handling  */
27         unsigned int bpt_insn[2];
28
29         struct restart_block    restart_block;
30 };
31
32 /*
33  * Macros/functions for gaining access to the thread information structure.
34  */
35 #define INIT_THREAD_INFO(tsk)                   \
36 {                                               \
37         .task           = &tsk,                 \
38         .exec_domain    = &default_exec_domain, \
39         .addr_limit     = KERNEL_DS,            \
40         .preempt_count  = INIT_PREEMPT_COUNT,   \
41         .restart_block = {                      \
42                 .fn = do_no_restart_syscall,    \
43         },                                      \
44 }
45
46 #define init_thread_info        (init_thread_union.thread_info)
47 #define init_stack              (init_thread_union.stack)
48
49 /* How to get the thread information struct from C.  */
50 register struct thread_info *__current_thread_info __asm__("$8");
51 #define current_thread_info()  __current_thread_info
52
53 /* Thread information allocation.  */
54 #define THREAD_SIZE_ORDER 1
55 #define THREAD_SIZE (2*PAGE_SIZE)
56
57 #endif /* __ASSEMBLY__ */
58
59 #define PREEMPT_ACTIVE          0x40000000
60
61 /*
62  * Thread information flags:
63  * - these are process state flags and used from assembly
64  * - pending work-to-be-done flags come first to fit in and immediate operand.
65  *
66  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
67  */
68 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
69 #define TIF_SIGPENDING          1       /* signal pending */
70 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
71 #define TIF_POLLING_NRFLAG      3       /* poll_idle is polling NEED_RESCHED */
72 #define TIF_DIE_IF_KERNEL       4       /* dik recursion lock */
73 #define TIF_UAC_NOPRINT         5       /* see sysinfo.h */
74 #define TIF_UAC_NOFIX           6
75 #define TIF_UAC_SIGBUS          7
76 #define TIF_MEMDIE              8
77 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal */
78 #define TIF_FREEZE              16      /* is freezing for suspend */
79
80 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
81 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
82 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
83 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
84 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
85 #define _TIF_FREEZE             (1<<TIF_FREEZE)
86
87 /* Work to do on interrupt/exception return.  */
88 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
89
90 /* Work to do on any return to userspace.  */
91 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
92                                  | _TIF_SYSCALL_TRACE)
93
94 #define ALPHA_UAC_SHIFT         6
95 #define ALPHA_UAC_MASK          (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
96                                  1 << TIF_UAC_SIGBUS)
97
98 #define SET_UNALIGN_CTL(task,value)     ({                                   \
99         task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
100                 ~ALPHA_UAC_MASK)                                             \
101                 | (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
102                 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
103                 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
104         0; })
105
106 #define GET_UNALIGN_CTL(task,value)     ({                              \
107         put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
108                   >> ALPHA_UAC_SHIFT                                    \
109                  | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
110                  >> (ALPHA_UAC_SHIFT + 1)                               \
111                  | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
112                  >> (ALPHA_UAC_SHIFT - 1),                              \
113                  (int __user *)(value));                                \
114         })
115
116 #endif /* __KERNEL__ */
117 #endif /* _ALPHA_THREAD_INFO_H */