text: /* thread_info.h: h8300 low-level thread information
   * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
   *
   * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   */
  
  #ifndef _ASM_THREAD_INFO_H
  #define _ASM_THREAD_INFO_H
  
  #include <asm/page.h>
  
  #ifdef __KERNEL__
  
  #ifndef __ASSEMBLY__
  
  /*
   * low level task data.
   * If you change this, change the TI_* offsets below to match.
   */
  struct thread_info {
  	struct task_struct *task;		/* main task structure */
  	struct exec_domain *exec_domain;	/* execution domain */
  	unsigned long	   flags;		/* low level flags */
  	int		   cpu;			/* cpu we're on */
  	int		   preempt_count;	/* 0 => preemptable, <0 => BUG */
  	struct restart_block restart_block;
  };
  
  /*
   * macros/functions for gaining access to the thread information structure
   */
  #define INIT_THREAD_INFO(tsk)			\
  {						\
  	.task =		&tsk,			\
  	.exec_domain =	&default_exec_domain,	\
  	.flags =	0,			\
  	.cpu =		0,			\
  	.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)
  
  
  /*
   * Size of kernel stack for each process. This must be a power of 2...
   */
  #define THREAD_SIZE_ORDER	1
  #define THREAD_SIZE		8192	/* 2 pages */
  
  
  /* how to get the thread information struct from C */
  static inline struct thread_info *current_thread_info(void)
  {
  	struct thread_info *ti;
  	__asm__(
  		"mov.l	sp, %0 \n\t"
  		"and.l	%1, %0"
  		: "=&r"(ti)
  		: "i" (~(THREAD_SIZE-1))
  		);
  	return ti;
  }
  
  #endif /* __ASSEMBLY__ */
  
  /*
   * Offsets in thread_info structure, used in assembly code
   */
  #define TI_TASK		0
  #define TI_EXECDOMAIN	4
  #define TI_FLAGS	8
  #define TI_CPU		12
  #define TI_PRE_COUNT	16
  
  #define	PREEMPT_ACTIVE	0x4000000
  
  /*
   * thread information flag bit numbers
   */
  #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_MEMDIE		4
  #define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
  #define TIF_NOTIFY_RESUME	6	/* callback before returning to user */
  #define TIF_FREEZE		16	/* is freezing for suspend */
  
  /* as above, but as bit values */
  #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_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
  #define _TIF_FREEZE		(1<<TIF_FREEZE)
  
  #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
  
  #endif /* __KERNEL__ */
  
  #endif /* _ASM_THREAD_INFO_H */
  