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#include <asm/segment.h>
  13
  14#ifdef __KERNEL__
  15
  16#ifndef __ASSEMBLY__
  17
  18/*
  19 * low level task data.
  20 * If you change this, change the TI_* offsets below to match.
  21 */
  22struct thread_info {
  23        struct task_struct *task;               /* main task structure */
  24        unsigned long      flags;               /* low level flags */
  25        int                cpu;                 /* cpu we're on */
  26        int                preempt_count;       /* 0 => preemptable, <0 => BUG */
  27        mm_segment_t            addr_limit;
  28        struct restart_block restart_block;
  29};
  30
  31/*
  32 * macros/functions for gaining access to the thread information structure
  33 */
  34#define INIT_THREAD_INFO(tsk)                   \
  35{                                               \
  36        .task =         &tsk,                   \
  37        .flags =        0,                      \
  38        .cpu =          0,                      \
  39        .preempt_count = INIT_PREEMPT_COUNT,    \
  40        .addr_limit     = KERNEL_DS,            \
  41        .restart_block  = {                     \
  42                .fn = do_no_restart_syscall,    \
  43        },                                      \
  44}
  45
  46#define init_thread_info        (init_thread_union.thread_info)
  47#define init_stack              (init_thread_union.stack)
  48
  49
  50/*
  51 * Size of kernel stack for each process. This must be a power of 2...
  52 */
  53#define THREAD_SIZE_ORDER       1
  54#define THREAD_SIZE             8192    /* 2 pages */
  55
  56
  57/* how to get the thread information struct from C */
  58static inline struct thread_info *current_thread_info(void)
  59{
  60        struct thread_info *ti;
  61
  62        __asm__("mov.l  sp, %0\n\t"
  63                "and.w  %1, %T0"
  64                : "=&r"(ti)
  65                : "i" (~(THREAD_SIZE-1) & 0xffff));
  66        return ti;
  67}
  68
  69#endif /* __ASSEMBLY__ */
  70
  71/*
  72 * thread information flag bit numbers
  73 */
  74#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  75#define TIF_SIGPENDING          1       /* signal pending */
  76#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  77#define TIF_SINGLESTEP          3       /* singlestepping active */
  78#define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  79#define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  80#define TIF_NOTIFY_RESUME       6       /* callback before returning to user */
  81#define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  82#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
  83#define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling TIF_NEED_RESCHED */
  84
  85/* as above, but as bit values */
  86#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  87#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  88#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  89#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  90#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
  91#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  92#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
  93#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  94
  95/* work to do in syscall trace */
  96#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
  97                                 _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
  98
  99/* work to do on any return to u-space */
 100#define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 101                                 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 102                                 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 103                                 _TIF_SYSCALL_TRACEPOINT)
 104
 105/* work to do on interrupt/exception return */
 106#define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 107                                 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 108
 109#endif /* __KERNEL__ */
 110
 111#endif /* _ASM_THREAD_INFO_H */
 112