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 */