[deliverable/linux.git] / include / asm-blackfin / thread_info.h

/*
 * File:         include/asm-blackfin/thread_info.h
 * Based on:     include/asm-m68knommu/thread_info.h
 * Author:       LG Soft India
 *               Copyright (C) 2004-2005 Analog Devices Inc.
 * Created:      Tue Sep 21 2004
 * Description:  Blackfin low-level thread information
 * Modified:
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#include <asm/page.h>
#include <asm/entry.h>
#include <asm/l1layout.h>
#include <linux/compiler.h>

#ifdef __KERNEL__

/* Thread Align Mask to reach to the top of the stack
 * for any process
 */
#define ALIGN_PAGE_MASK         0xffffe000

/*
 * 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 */

#ifndef __ASSEMBLY__

typedef unsigned long mm_segment_t;

/*
 * 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 */
	mm_segment_t addr_limit;	/* address limit */
	struct restart_block restart_block;
	struct l1_scratch_task_info l1_task_info;
};

/*
 * 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)

/* Given a task stack pointer, you can find its corresponding
 * thread_info structure just by masking it to the THREAD_SIZE
 * boundary (currently 8K as you can see above).
 */
__attribute_const__
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
      __asm__("%0 = sp;": "=&d"(ti):
	);
	return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
}

#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_PREEMPT	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_FREEZE              6       /* 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_FREEZE             (1<<TIF_FREEZE)

#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */

#endif				/* __KERNEL__ */

#endif				/* _ASM_THREAD_INFO_H */
Commit	Line	Data
1394f032 BW	1	/*
	2	* File: include/asm-blackfin/thread_info.h
	3	* Based on: include/asm-m68knommu/thread_info.h
	4	* Author: LG Soft India
	5	* Copyright (C) 2004-2005 Analog Devices Inc.
	6	* Created: Tue Sep 21 2004
	7	* Description: Blackfin low-level thread information
	8	* Modified:
	9	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2, or (at your option)
	14	* any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; see the file COPYING.
	23	* If not, write to the Free Software Foundation,
	24	* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	25	*/
	26
	27	#ifndef _ASM_THREAD_INFO_H
	28	#define _ASM_THREAD_INFO_H
	29
	30	#include <asm/page.h>
	31	#include <asm/entry.h>
	32	#include <asm/l1layout.h>
	33	#include <linux/compiler.h>
	34
	35	#ifdef __KERNEL__
	36
	37	/* Thread Align Mask to reach to the top of the stack
	38	* for any process
	39	*/
	40	#define ALIGN_PAGE_MASK 0xffffe000
	41
12a79911 MF	42	/*
	43	* Size of kernel stack for each process. This must be a power of 2...
	44	*/
b69c49b7	45	#define THREAD_SIZE_ORDER 1
12a79911 MF	46	#define THREAD_SIZE 8192 /* 2 pages */
12a79911 MF	47
1394f032 BW	48	#ifndef __ASSEMBLY__
	49
	50	typedef unsigned long mm_segment_t;
	51
	52	/*
	53	* low level task data.
	54	* If you change this, change the TI_* offsets below to match.
	55	*/
	56
	57	struct thread_info {
	58	struct task_struct task; / main task structure */
	59	struct exec_domain exec_domain; / execution domain */
	60	unsigned long flags; /* low level flags */
	61	int cpu; /* cpu we're on */
	62	int preempt_count; /* 0 => preemptable, <0 => BUG */
	63	mm_segment_t addr_limit; /* address limit */
	64	struct restart_block restart_block;
	65	struct l1_scratch_task_info l1_task_info;
	66	};
	67
	68	/*
	69	* macros/functions for gaining access to the thread information structure
	70	*/
	71	#define INIT_THREAD_INFO(tsk) \
	72	{ \
	73	.task = &tsk, \
	74	.exec_domain = &default_exec_domain, \
	75	.flags = 0, \
	76	.cpu = 0, \
	77	.preempt_count = 1, \
	78	.restart_block = { \
	79	.fn = do_no_restart_syscall, \
	80	}, \
	81	}
	82	#define init_thread_info (init_thread_union.thread_info)
	83	#define init_stack (init_thread_union.stack)
	84
18628e43 RD	85	/* Given a task stack pointer, you can find its corresponding
	86	* thread_info structure just by masking it to the THREAD_SIZE
	87	* boundary (currently 8K as you can see above).
1394f032	88	*/
18628e43	89	__attribute_const__
1394f032 BW	90	static inline struct thread_info *current_thread_info(void)
	91	{
	92	struct thread_info *ti;
	93	__asm__("%0 = sp;": "=&d"(ti):
	94	);
12a79911	95	return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
1394f032 BW	96	}
1394f032 BW	97
1394f032 BW	98	#endif /* __ASSEMBLY__ */
	99
	100	/*
	101	* Offsets in thread_info structure, used in assembly code
	102	*/
	103	#define TI_TASK 0
	104	#define TI_EXECDOMAIN 4
	105	#define TI_FLAGS 8
	106	#define TI_CPU 12
	107	#define TI_PREEMPT 16
	108
	109	#define PREEMPT_ACTIVE 0x4000000
	110
	111	/*
	112	* thread information flag bit numbers
	113	*/
	114	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	115	#define TIF_SIGPENDING 1 /* signal pending */
	116	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	117	#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
1394f032	118	TIF_NEED_RESCHED */
a583f1b5 SE	119	#define TIF_MEMDIE 4
	120	#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
	121	#define TIF_FREEZE 6 /* is freezing for suspend */
1394f032 BW	122
	123	/* as above, but as bit values */
	124	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1394f032 BW	125	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	126	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	127	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	128	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
	129	#define _TIF_FREEZE (1<<TIF_FREEZE)
	130
	131	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	132
	133	#endif /* __KERNEL__ */
	134
	135	#endif /* _ASM_THREAD_INFO_H */