arch/h8300/include/asm/thread_info.h

   1 /* thread_info.h: h8300 low-level thread information
   2  * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
   3  *
   4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   6  */
   7
   8 #ifndef _ASM_THREAD_INFO_H
   9 #define _ASM_THREAD_INFO_H
  10
  11 #include <asm/page.h>
  12 #include <asm/segment.h>
  13
  14 #ifdef __KERNEL__
  15
  16 /*
  17  * Size of kernel stack for each process. This must be a power of 2...
  18  */
  19 #define THREAD_SIZE_ORDER       1
  20 #define THREAD_SIZE             8192    /* 2 pages */
  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         unsigned long      flags;               /* low level flags */
  31         int                cpu;                 /* cpu we're on */
  32         int                preempt_count;       /* 0 => preemptable, <0 => BUG */
  33         mm_segment_t            addr_limit;
  34 };
  35
  36 /*
  37  * macros/functions for gaining access to the thread information structure
  38  */
  39 #define INIT_THREAD_INFO(tsk)                   \
  40 {                                               \
  41         .task =         &tsk,                   \
  42         .flags =        0,                      \
  43         .cpu =          0,                      \
  44         .preempt_count = INIT_PREEMPT_COUNT,    \
  45         .addr_limit     = KERNEL_DS,            \
  46 }
  47
  48 #define init_thread_info        (init_thread_union.thread_info)
  49 #define init_stack              (init_thread_union.stack)
  50
  51 /* how to get the thread information struct from C */
  52 static inline struct thread_info *current_thread_info(void)
  53 {
  54         struct thread_info *ti;
  55
  56         __asm__("mov.l  sp, %0\n\t"
  57                 "and.w  %1, %T0"
  58                 : "=&r"(ti)
  59                 : "i" (~(THREAD_SIZE-1) & 0xffff));
  60         return ti;
  61 }
  62
  63 #endif /* __ASSEMBLY__ */
  64
  65 /*
  66  * thread information flag bit numbers
  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_SINGLESTEP          3       /* singlestepping active */
  72 #define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  73 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  74 #define TIF_NOTIFY_RESUME       6       /* callback before returning to user */
  75 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  76 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
  77 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling TIF_NEED_RESCHED */
  78
  79 /* as above, but as bit values */
  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_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  84 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
  85 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  86 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
  87 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  88
  89 /* work to do in syscall trace */
  90 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
  91                                  _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
  92
  93 /* work to do on any return to u-space */
  94 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
  95                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
  96                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
  97                                  _TIF_SYSCALL_TRACEPOINT)
  98
  99 /* work to do on interrupt/exception return */
 100 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 101                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 102
 103 #endif /* __KERNEL__ */
 104
 105 #endif /* _ASM_THREAD_INFO_H */