[deliverable/linux.git] / arch / s390 / include / asm / thread_info.h

/*
 *  include/asm-s390/thread_info.h
 *
 *  S390 version
 *    Copyright (C) IBM Corp. 2002,2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

/*
 * Size of kernel stack for each process
 */
#ifndef __s390x__
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#else /* __s390x__ */
#ifndef __SMALL_STACK
#define THREAD_ORDER 2
#define ASYNC_ORDER  2
#else
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#endif
#endif /* __s390x__ */

#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
#define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/lowcore.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 int		cpu;		/* current CPU */
	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	= 1,			\
	.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 */
static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
}

#define THREAD_SIZE_ORDER THREAD_ORDER

#endif

/*
 * thread information flags bit numbers
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_RESTART_SVC		4	/* restart svc with new svc number */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SINGLE_STEP		6	/* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING	7	/* machine check handling is pending */
#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_31BIT		18	/* 32bit process */ 
#define TIF_MEMDIE		19
#define TIF_RESTORE_SIGMASK	20	/* restore signal mask in do_signal() */
#define TIF_FREEZE		21	/* thread is freezing for suspend */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_RESTART_SVC	(1<<TIF_RESTART_SVC)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLE_STEP	(1<<TIF_SINGLE_STEP)
#define _TIF_MCCK_PENDING	(1<<TIF_MCCK_PENDING)
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT		(1<<TIF_31BIT)
#define _TIF_FREEZE		(1<<TIF_FREEZE)

#endif /* __KERNEL__ */

#define PREEMPT_ACTIVE		0x4000000

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-s390/thread_info.h
	3	*
	4	* S390 version
54dfe5dd	5	* Copyright (C) IBM Corp. 2002,2006
1da177e4 LT	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
	7	*/
	8
	9	#ifndef _ASM_THREAD_INFO_H
	10	#define _ASM_THREAD_INFO_H
	11
	12	#ifdef __KERNEL__
	13
	14	/*
	15	* Size of kernel stack for each process
	16	*/
	17	#ifndef __s390x__
1da177e4 LT	18	#define THREAD_ORDER 1
1da177e4 LT	19	#define ASYNC_ORDER 1
1da177e4 LT	20	#else /* __s390x__ */
	21	#ifndef __SMALL_STACK
	22	#define THREAD_ORDER 2
	23	#define ASYNC_ORDER 2
	24	#else
	25	#define THREAD_ORDER 1
	26	#define ASYNC_ORDER 1
	27	#endif
	28	#endif /* __s390x__ */
	29
	30	#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
	31	#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
	32
	33	#ifndef __ASSEMBLY__
	34	#include <asm/processor.h>
	35	#include <asm/lowcore.h>
	36
	37	/*
	38	* low level task data that entry.S needs immediate access to
	39	* - this struct should fit entirely inside of one cache line
	40	* - this struct shares the supervisor stack pages
	41	* - if the contents of this structure are changed, the assembly constants must also be changed
	42	*/
	43	struct thread_info {
	44	struct task_struct task; / main task structure */
	45	struct exec_domain exec_domain; / execution domain */
	46	unsigned long flags; /* low level flags */
	47	unsigned int cpu; /* current CPU */
dcd497f9	48	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	49	struct restart_block restart_block;
	50	};
	51
	52	/*
	53	* macros/functions for gaining access to the thread information structure
	54	*/
	55	#define INIT_THREAD_INFO(tsk) \
	56	{ \
	57	.task = &tsk, \
	58	.exec_domain = &default_exec_domain, \
	59	.flags = 0, \
	60	.cpu = 0, \
cc43ec1a	61	.preempt_count = 1, \
1da177e4 LT	62	.restart_block = { \
	63	.fn = do_no_restart_syscall, \
	64	}, \
	65	}
	66
	67	#define init_thread_info (init_thread_union.thread_info)
	68	#define init_stack (init_thread_union.stack)
	69
	70	/* how to get the thread information struct from C */
	71	static inline struct thread_info *current_thread_info(void)
	72	{
	73	return (struct thread_info )(((unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
	74	}
	75
b69c49b7	76	#define THREAD_SIZE_ORDER THREAD_ORDER
1da177e4 LT	77
	78	#endif
	79
	80	/*
	81	* thread information flags bit numbers
	82	*/
	83	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
753c4dd6	84	#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
1da177e4 LT	85	#define TIF_SIGPENDING 2 /* signal pending */
	86	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	87	#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
	88	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
	89	#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
77fa2245	90	#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
1da177e4 LT	91	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	92	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling
	93	TIF_NEED_RESCHED */
	94	#define TIF_31BIT 18 /* 32bit process */
	95	#define TIF_MEMDIE 19
02a029b3	96	#define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */
83224b08	97	#define TIF_FREEZE 21 /* thread is freezing for suspend */
1da177e4 LT	98
1da177e4 LT	99	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
753c4dd6	100	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
54dfe5dd	101	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
1da177e4 LT	102	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	103	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	104	#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
	105	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	106	#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
77fa2245	107	#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
1da177e4 LT	108	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
	109	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	110	#define _TIF_31BIT (1<<TIF_31BIT)
83224b08	111	#define _TIF_FREEZE (1<<TIF_FREEZE)
1da177e4 LT	112
	113	#endif /* __KERNEL__ */
	114
	115	#define PREEMPT_ACTIVE 0x4000000
	116
	117	#endif /* _ASM_THREAD_INFO_H */