d51491ed00b81de8ae49426d5cc07e6c6fa97f5a
[linux-3.10.git] / include / asm-alpha / 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         .restart_block = {                      \
41                 .fn = do_no_restart_syscall,    \
42         },                                      \
43 }
44
45 #define init_thread_info        (init_thread_union.thread_info)
46 #define init_stack              (init_thread_union.stack)
47
48 /* How to get the thread information struct from C.  */
49 register struct thread_info *__current_thread_info __asm__("$8");
50 #define current_thread_info()  __current_thread_info
51
52 /* Thread information allocation.  */
53 #define THREAD_SIZE (2*PAGE_SIZE)
54 #define alloc_thread_info(tsk) \
55   ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
56 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
57 #define get_thread_info(ti) get_task_struct((ti)->task)
58 #define put_thread_info(ti) put_task_struct((ti)->task)
59
60 #endif /* __ASSEMBLY__ */
61
62 #define PREEMPT_ACTIVE          0x40000000
63
64 /*
65  * Thread information flags:
66  * - these are process state flags and used from assembly
67  * - pending work-to-be-done flags come first to fit in and immediate operand.
68  *
69  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
70  */
71 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
72 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
73 #define TIF_SIGPENDING          2       /* signal pending */
74 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
75 #define TIF_POLLING_NRFLAG      4       /* poll_idle is polling NEED_RESCHED */
76 #define TIF_DIE_IF_KERNEL       5       /* dik recursion lock */
77 #define TIF_UAC_NOPRINT         6       /* see sysinfo.h */
78 #define TIF_UAC_NOFIX           7
79 #define TIF_UAC_SIGBUS          8
80 #define TIF_MEMDIE              9
81
82 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
83 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
84 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
85 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
86 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
87
88 /* Work to do on interrupt/exception return.  */
89 #define _TIF_WORK_MASK          (_TIF_NOTIFY_RESUME     \
90                                  | _TIF_SIGPENDING      \
91                                  | _TIF_NEED_RESCHED)
92
93 /* Work to do on any return to userspace.  */
94 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
95                                  | _TIF_SYSCALL_TRACE)
96
97 #endif /* __KERNEL__ */
98 #endif /* _ALPHA_THREAD_INFO_H */