LXR linux/arch/h8300/include/asm/thread

   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
  13#ifdef __KERNEL__
  14
  15#ifndef __ASSEMBLY__
  16
  17/*
  18 * low level task data.
  19 * If you change this, change the TI_* offsets below to match.
  20 */
  21struct thread_info {
  22        struct task_struct *task;               /* main task structure */
  23        struct exec_domain *exec_domain;        /* execution domain */
  24        unsigned long      flags;               /* low level flags */
  25        int                cpu;                 /* cpu we're on */
  26        int                preempt_count;       /* 0 => preemptable, <0 => BUG */
  27        struct restart_block restart_block;
  28};
  29
  30/*
  31 * macros/functions for gaining access to the thread information structure
  32 */
  33#define INIT_THREAD_INFO(tsk)                   \
  34{                                               \
  35        .task =         &tsk,                   \
  36        .exec_domain =  &default_exec_domain,   \
  37        .flags =        0,                      \
  38        .cpu =          0,                      \
  39        .preempt_count = INIT_PREEMPT_COUNT,    \
  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
  49/*
  50 * Size of kernel stack for each process. This must be a power of 2...
  51 */
  52#define THREAD_SIZE_ORDER       1
  53#define THREAD_SIZE             8192    /* 2 pages */
  54
  55
  56/* how to get the thread information struct from C */
  57static inline struct thread_info *current_thread_info(void)
  58{
  59        struct thread_info *ti;
  60        __asm__(
  61                "mov.l  sp, %0 \n\t"
  62                "and.l  %1, %0"
  63                : "=&r"(ti)
  64                : "i" (~(THREAD_SIZE-1))
  65                );
  66        return ti;
  67}
  68
  69#endif /* __ASSEMBLY__ */
  70
  71/*
  72 * Offsets in thread_info structure, used in assembly code
  73 */
  74#define TI_TASK         0
  75#define TI_EXECDOMAIN   4
  76#define TI_FLAGS        8
  77#define TI_CPU          12
  78#define TI_PRE_COUNT    16
  79
  80#define PREEMPT_ACTIVE  0x4000000
  81
  82/*
  83 * thread information flag bit numbers
  84 */
  85#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  86#define TIF_SIGPENDING          1       /* signal pending */
  87#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  88#define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  89#define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  90#define TIF_NOTIFY_RESUME       6       /* callback before returning to user */
  91
  92/* as above, but as bit values */
  93#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  94#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  95#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  96#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  97
  98#define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  99                                 _TIF_NOTIFY_RESUME)
 100
 101#endif /* __KERNEL__ */
 102
 103#endif /* _ASM_THREAD_INFO_H */
 104