text: #ifndef _ASM_PARISC_THREAD_INFO_H
  #define _ASM_PARISC_THREAD_INFO_H
  
  #ifdef __KERNEL__
  
  #ifndef __ASSEMBLY__
  #include <asm/processor.h>
  #include <asm/special_insns.h>
  
  struct thread_info {
  	struct task_struct *task;	/* main task structure */
  	struct exec_domain *exec_domain;/* execution domain */
  	unsigned long flags;		/* thread_info flags (see TIF_*) */
  	mm_segment_t addr_limit;	/* user-level address space limit */
  	__u32 cpu;			/* current CPU */
  	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
  	struct restart_block restart_block;
  };
  
  #define INIT_THREAD_INFO(tsk)			\
  {						\
  	.task		= &tsk,			\
  	.exec_domain	= &default_exec_domain,	\
  	.flags		= 0,			\
  	.cpu		= 0,			\
  	.addr_limit	= KERNEL_DS,		\
  	.preempt_count	= INIT_PREEMPT_COUNT,	\
    	.restart_block	= {			\
  		.fn = do_no_restart_syscall	\
  	}					\
  }
  
  #define init_thread_info        (init_thread_union.thread_info)
  #define init_stack              (init_thread_union.stack)
  
  /* how to get the thread information struct from C */
  #define current_thread_info()	((struct thread_info *)mfctl(30))
  
  #endif /* !__ASSEMBLY */
  
  /* thread information allocation */
  
  #define THREAD_SIZE_ORDER            2
  /* Be sure to hunt all references to this down when you change the size of
   * the kernel stack */
  #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  #define THREAD_SHIFT            (PAGE_SHIFT + THREAD_SIZE_ORDER)
  
  #define PREEMPT_ACTIVE_BIT	28
  #define PREEMPT_ACTIVE		(1 << PREEMPT_ACTIVE_BIT)
  
  /*
   * thread information flags
   */
  #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
  #define TIF_SIGPENDING		1	/* signal pending */
  #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
  #define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling TIF_NEED_RESCHED */
  #define TIF_32BIT               4       /* 32 bit binary */
  #define TIF_MEMDIE		5	/* is terminating due to OOM killer */
  #define TIF_RESTORE_SIGMASK	6	/* restore saved signal mask */
  #define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
  #define TIF_SINGLESTEP		9	/* single stepping? */
  #define TIF_BLOCKSTEP		10	/* branch stepping? */
  
  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
  #define _TIF_32BIT		(1 << TIF_32BIT)
  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
  #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
  #define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)
  
  #define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
                                   _TIF_NEED_RESCHED)
  #define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP |	\
  				 _TIF_BLOCKSTEP)
  
  #define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
  
  #endif /* __KERNEL__ */
  
  #endif /* _ASM_PARISC_THREAD_INFO_H */
  