[linux-2.6-block.git] / arch / blackfin / include / asm / thread_info.h

/*
 * Copyright 2004-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#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 */
#define STACK_WARN		(THREAD_SIZE/8)

#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 */
	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 */
#ifndef CONFIG_SMP
	struct l1_scratch_task_info l1_task_info;
#endif
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
}
#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;" : "=da"(ti));
	return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
}

#endif				/* __ASSEMBLY__ */

/*
 * 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_MEMDIE		4	/* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
#define TIF_IRQ_SYNC		7	/* sync pipeline stage */
#define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
#define TIF_SINGLESTEP		9

/* 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_IRQ_SYNC		(1<<TIF_IRQ_SYNC)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)

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

#endif				/* __KERNEL__ */

#endif				/* _ASM_THREAD_INFO_H */
Commit	Line	Data
1394f032	1	/*
3750411f	2	* Copyright 2004-2010 Analog Devices Inc.
1394f032	3	*
96f1050d	4	* Licensed under the GPL-2 or later.
1394f032 BW	5	*/
	6
	7	#ifndef _ASM_THREAD_INFO_H
	8	#define _ASM_THREAD_INFO_H
	9
	10	#include <asm/page.h>
	11	#include <asm/entry.h>
	12	#include <asm/l1layout.h>
	13	#include <linux/compiler.h>
	14
	15	#ifdef __KERNEL__
	16
	17	/* Thread Align Mask to reach to the top of the stack
	18	* for any process
	19	*/
3750411f	20	#define ALIGN_PAGE_MASK 0xffffe000
1394f032	21
12a79911 MF	22	/*
	23	* Size of kernel stack for each process. This must be a power of 2...
	24	*/
b69c49b7	25	#define THREAD_SIZE_ORDER 1
12a79911	26	#define THREAD_SIZE 8192 /* 2 pages */
a45d575f	27	#define STACK_WARN (THREAD_SIZE/8)
12a79911	28
1394f032 BW	29	#ifndef __ASSEMBLY__
	30
	31	typedef unsigned long mm_segment_t;
	32
	33	/*
	34	* low level task data.
	35	* If you change this, change the TI_* offsets below to match.
	36	*/
	37
	38	struct thread_info {
	39	struct task_struct task; / main task structure */
1394f032 BW	40	unsigned long flags; /* low level flags */
	41	int cpu; /* cpu we're on */
	42	int preempt_count; /* 0 => preemptable, <0 => BUG */
	43	mm_segment_t addr_limit; /* address limit */
cc92b870	44	#ifndef CONFIG_SMP
1394f032	45	struct l1_scratch_task_info l1_task_info;
cc92b870	46	#endif
1394f032 BW	47	};
	48
	49	/*
	50	* macros/functions for gaining access to the thread information structure
	51	*/
	52	#define INIT_THREAD_INFO(tsk) \
	53	{ \
	54	.task = &tsk, \
1394f032 BW	55	.flags = 0, \
1394f032 BW	56	.cpu = 0, \
3750411f	57	.preempt_count = INIT_PREEMPT_COUNT, \
1394f032 BW	58	}
	59	#define init_thread_info (init_thread_union.thread_info)
	60	#define init_stack (init_thread_union.stack)
	61
18628e43 RD	62	/* Given a task stack pointer, you can find its corresponding
	63	* thread_info structure just by masking it to the THREAD_SIZE
	64	* boundary (currently 8K as you can see above).
1394f032	65	*/
18628e43	66	__attribute_const__
1394f032 BW	67	static inline struct thread_info *current_thread_info(void)
	68	{
	69	struct thread_info *ti;
3750411f	70	__asm__("%0 = sp;" : "=da"(ti));
12a79911	71	return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
1394f032 BW	72	}
1394f032 BW	73
1394f032 BW	74	#endif /* __ASSEMBLY__ */
1394f032 BW	75
1394f032 BW	76	/*
	77	* thread information flag bit numbers
	78	*/
	79	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	80	#define TIF_SIGPENDING 1 /* signal pending */
a583f1b5 SE	81	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
0ddc9324	82	#define TIF_MEMDIE 4 /* is terminating due to OOM killer */
a583f1b5	83	#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
3750411f MF	84	#define TIF_IRQ_SYNC 7 /* sync pipeline stage */
3750411f MF	85	#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
600482c1	86	#define TIF_SINGLESTEP 9
1394f032 BW	87
	88	/* as above, but as bit values */
	89	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1394f032 BW	90	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
1394f032 BW	91	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
3750411f MF	92	#define _TIF_IRQ_SYNC (1<<TIF_IRQ_SYNC)
3750411f MF	93	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
600482c1	94	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
1394f032 BW	95
	96	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	97
	98	#endif /* __KERNEL__ */
	99
	100	#endif /* _ASM_THREAD_INFO_H */