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         struct restart_block restart_block;
  35 };
  36
  37 /*
  38  * macros/functions for gaining access to the thread information structure
  39  */
  40 #define INIT_THREAD_INFO(tsk)                   \
  41 {                                               \
  42         .task =         &tsk,                   \
  43         .flags =        0,                      \
  44         .cpu =          0,                      \
  45         .preempt_count = INIT_PREEMPT_COUNT,    \
  46         .addr_limit     = KERNEL_DS,            \
  47         .restart_block  = {                     \
  48                 .fn = do_no_restart_syscall,    \
  49         },                                      \
  50 }
  51
  52 #define init_thread_info        (init_thread_union.thread_info)
  53 #define init_stack              (init_thread_union.stack)
  54
  55 /* how to get the thread information struct from C */
  56 static inline struct thread_info *current_thread_info(void)
  57 {
  58         struct thread_info *ti;
  59
  60         __asm__("mov.l  sp, %0\n\t"
  61                 "and.w  %1, %T0"
  62                 : "=&r"(ti)
  63                 : "i" (~(THREAD_SIZE-1) & 0xffff));
  64         return ti;
  65 }
  66
  67 #endif /* __ASSEMBLY__ */
  68
  69 /*
  70  * thread information flag bit numbers
  71  */
  72 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  73 #define TIF_SIGPENDING          1       /* signal pending */
  74 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  75 #define TIF_SINGLESTEP          3       /* singlestepping active */
  76 #define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  77 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  78 #define TIF_NOTIFY_RESUME       6       /* callback before returning to user */
  79 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  80 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
  81 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling TIF_NEED_RESCHED */
  82
  83 /* as above, but as bit values */
  84 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  85 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  86 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  87 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  88 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
  89 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  90 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
  91 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  92
  93 /* work to do in syscall trace */
  94 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
  95                                  _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
  96
  97 /* work to do on any return to u-space */
  98 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
  99                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 100                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 101                                  _TIF_SYSCALL_TRACEPOINT)
 102
 103 /* work to do on interrupt/exception return */
 104 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 105                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 106
 107 #endif /* __KERNEL__ */
 108
 109 #endif /* _ASM_THREAD_INFO_H */