text: /*
   * Copyright (C) 2004-2006 Atmel Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #ifndef __ASM_AVR32_THREAD_INFO_H
  #define __ASM_AVR32_THREAD_INFO_H
  
  #include <asm/page.h>
  
  #define THREAD_SIZE_ORDER	1
  #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
  
  #ifndef __ASSEMBLY__
  #include <asm/types.h>
  
  struct task_struct;
  struct exec_domain;
  
  struct thread_info {
  	struct task_struct	*task;		/* main task structure */
  	struct exec_domain	*exec_domain;	/* execution domain */
  	unsigned long		flags;		/* low level flags */
  	__u32			cpu;
  	__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */
  	struct restart_block	restart_block;
  	__u8			supervisor_stack[0];
  };
  
  #define INIT_THREAD_INFO(tsk)						\
  {									\
  	.task		= &tsk,						\
  	.exec_domain	= &default_exec_domain,				\
  	.flags		= 0,						\
  	.cpu		= 0,						\
  	.preempt_count	= 1,						\
  	.restart_block	= {						\
  		.fn	= do_no_restart_syscall				\
  	}								\
  }
  
  #define init_thread_info	(init_thread_union.thread_info)
  #define init_stack		(init_thread_union.stack)
  
  /*
   * Get the thread information struct from C.
   * We do the usual trick and use the lower end of the stack for this
   */
  static inline struct thread_info *current_thread_info(void)
  {
  	unsigned long addr = ~(THREAD_SIZE - 1);
  
  	asm("and %0, sp" : "=r"(addr) : "0"(addr));
  	return (struct thread_info *)addr;
  }
  
  /* thread information allocation */
  #define alloc_thread_info(ti) \
  	((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
  #define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
  #define get_thread_info(ti) get_task_struct((ti)->task)
  #define put_thread_info(ti) put_task_struct((ti)->task)
  
  #endif /* !__ASSEMBLY__ */
  
  #define PREEMPT_ACTIVE		0x40000000
  
  /*
   * Thread information flags
   * - these are process state flags that various assembly files may need to access
   * - pending work-to-be-done flags are in LSW
   * - other flags in MSW
   */
  #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  #define TIF_SIGPENDING          2       /* signal pending */
  #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  					   TIF_NEED_RESCHED */
  #define TIF_BREAKPOINT		5	/* true if we should break after return */
  #define TIF_SINGLE_STEP		6	/* single step after next break */
  #define TIF_MEMDIE		7
  #define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal */
  #define TIF_USERSPACE		31      /* true if FS sets userspace */
  
  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
  #define _TIF_BREAKPOINT		(1 << TIF_BREAKPOINT)
  #define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
  #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
  #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
  
  /* XXX: These two masks must never span more than 16 bits! */
  /* work to do on interrupt/exception return */
  #define _TIF_WORK_MASK		0x0000013e
  /* work to do on any return to userspace */
  #define _TIF_ALLWORK_MASK	0x0000013f
  /* work to do on return from debug mode */
  #define _TIF_DBGWORK_MASK	0x0000017e
  
  #endif /* __ASM_AVR32_THREAD_INFO_H */
  