/* thread_info.h: MIPS low-level thread information
   *
   * 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
  
  #ifdef __KERNEL__

  
  #ifndef __ASSEMBLY__
  
  #include <asm/processor.h>
  
  /*
   * low level task data that entry.S needs immediate access to
   * - this struct should fit entirely inside of one cache line
   * - this struct shares the supervisor stack pages
   * - if the contents of this structure are changed, the assembly constants
   *   must also be changed
   */
  struct thread_info {
  	struct task_struct	*task;		/* main task structure */
  	struct exec_domain	*exec_domain;	/* execution domain */
  	unsigned long		flags;		/* low level flags */

  	unsigned long		tp_value;	/* thread pointer */

  	__u32			cpu;		/* current CPU */

  	int			preempt_count;	/* 0 => preemptable, <0 => BUG */

  
  	mm_segment_t		addr_limit;	/* thread address space:

  						   0-0xBFFFFFFF for user-thead

  						   0-0xFFFFFFFF for kernel-thread
  						*/
  	struct restart_block	restart_block;

  	struct pt_regs		*regs;

  };
  
  /*
   * macros/functions for gaining access to the thread information structure

   */
  #define INIT_THREAD_INFO(tsk)			\
  {						\
  	.task		= &tsk,			\
  	.exec_domain	= &default_exec_domain,	\

  	.flags		= _TIF_FIXADE,		\

  	.cpu		= 0,			\

  	.preempt_count	= INIT_PREEMPT_COUNT,	\

  	.addr_limit	= KERNEL_DS,		\
  	.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.  */
  register struct thread_info *__current_thread_info __asm__("$28");
  #define current_thread_info()  __current_thread_info
  
  /* thread information allocation */

  #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)

  #define THREAD_SIZE_ORDER (1)
  #endif

  #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)

  #define THREAD_SIZE_ORDER (2)
  #endif
  #ifdef CONFIG_PAGE_SIZE_8KB
  #define THREAD_SIZE_ORDER (1)
  #endif
  #ifdef CONFIG_PAGE_SIZE_16KB
  #define THREAD_SIZE_ORDER (0)
  #endif

  #ifdef CONFIG_PAGE_SIZE_32KB
  #define THREAD_SIZE_ORDER (0)
  #endif

  #ifdef CONFIG_PAGE_SIZE_64KB
  #define THREAD_SIZE_ORDER (0)
  #endif
  
  #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
  #define THREAD_MASK (THREAD_SIZE - 1UL)

  #define STACK_WARN	(THREAD_SIZE / 8)

  #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

  #ifdef CONFIG_DEBUG_STACK_USAGE

  #define alloc_thread_info_node(tsk, node) \
  		kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)

  #else

  #define alloc_thread_info_node(tsk, node) \
  		kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)

  #endif
  
  #define free_thread_info(info) kfree(info)

  
  #endif /* !__ASSEMBLY__ */
  
  #define PREEMPT_ACTIVE		0x10000000
  
  /*
   * 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_SIGPENDING		1	/* signal pending */
  #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
  #define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
  #define TIF_SECCOMP		4	/* secure computing */

  #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */

  #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */

  #define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
  #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */

  #define TIF_MEMDIE		18	/* is terminating due to OOM killer */

  #define TIF_FIXADE		20	/* Fix address errors in software */
  #define TIF_LOGADE		21	/* Log address errors to syslog */
  #define TIF_32BIT_REGS		22	/* also implies 16/32 fprs */
  #define TIF_32BIT_ADDR		23	/* 32-bit address space (o32/n32) */
  #define TIF_FPUBOUND		24	/* thread bound to FPU-full CPU set */

  #define TIF_LOAD_WATCH		25	/* If set, load watch registers */

  #define TIF_SYSCALL_TRACE	31	/* syscall trace active */

  #ifdef CONFIG_MIPS32_O32
  #define TIF_32BIT TIF_32BIT_REGS
  #elif defined(CONFIG_MIPS32_N32)
  #define TIF_32BIT _TIF_32BIT_ADDR
  #endif /* CONFIG_MIPS32_O32 */

  #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)

  #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
  #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
  #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)

  #define _TIF_SECCOMP		(1<<TIF_SECCOMP)

  #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)

  #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

  #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
  #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

  #define _TIF_FIXADE		(1<<TIF_FIXADE)
  #define _TIF_LOGADE		(1<<TIF_LOGADE)
  #define _TIF_32BIT_REGS		(1<<TIF_32BIT_REGS)
  #define _TIF_32BIT_ADDR		(1<<TIF_32BIT_ADDR)
  #define _TIF_FPUBOUND		(1<<TIF_FPUBOUND)

  #define _TIF_LOAD_WATCH		(1<<TIF_LOAD_WATCH)

  /* work to do in syscall_trace_leave() */
  #define _TIF_WORK_SYSCALL_EXIT	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT)

  /* work to do on interrupt/exception return */

  #define _TIF_WORK_MASK		(0x0000ffef &				\
  					~(_TIF_SECCOMP | _TIF_SYSCALL_AUDIT))

  /* work to do on any return to u-space */
  #define _TIF_ALLWORK_MASK	(0x8000ffff & ~_TIF_SECCOMP)

  
  #endif /* __KERNEL__ */
  
  #endif /* _ASM_THREAD_INFO_H */