[net-next-2.6.git] / include / asm-frv / thread_info.h

/* thread_info.h: description
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * Derived from include/asm-i386/thread_info.h
 *
 * 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 of the License, or (at your option) any later version.
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#endif

#define THREAD_SIZE		8192

/*
 * 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
 */
#ifndef __ASSEMBLY__

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		status;		/* thread-synchronous flags */
	__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;

	__u8			supervisor_stack[0];
};

#else /* !__ASSEMBLY__ */

#include <asm/asm-offsets.h>

#endif

#define PREEMPT_ACTIVE		0x10000000

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#ifndef __ASSEMBLY__

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= 1,			\
	.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("gr15");

#define current_thread_info() ({ __current_thread_info; })

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)					\
	({							\
		struct thread_info *ret;			\
								\
		ret = kmalloc(THREAD_SIZE, GFP_KERNEL);		\
		if (ret)					\
			memset(ret, 0, THREAD_SIZE);		\
		ret;						\
	})
#else
#define alloc_thread_info(tsk)	kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(info)	kfree(info)

#endif /* __ASSEMBLY__ */

/*
 * 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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
#define TIF_IRET		4	/* return with iret */
#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE		17	/* OOM killer killed process */
#define TIF_FREEZE		18	/* freezing for suspend */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_IRET		(1 << TIF_IRET)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_FREEZE		(1 << TIF_FREEZE)

#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
#define TS_USEDFPM		0x0001	/* FPU/Media was used by this task this quantum (SMP) */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/* thread_info.h: description
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	* Derived from include/asm-i386/thread_info.h
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#ifndef _ASM_THREAD_INFO_H
	14	#define _ASM_THREAD_INFO_H
	15
	16	#ifdef __KERNEL__
	17
	18	#ifndef __ASSEMBLY__
	19	#include <asm/processor.h>
	20	#endif
	21
84e8cd6d DH	22	#define THREAD_SIZE 8192
84e8cd6d DH	23
1da177e4 LT	24	/*
	25	* low level task data that entry.S needs immediate access to
	26	* - this struct should fit entirely inside of one cache line
	27	* - this struct shares the supervisor stack pages
	28	* - if the contents of this structure are changed, the assembly constants must also be changed
	29	*/
	30	#ifndef __ASSEMBLY__
	31
	32	struct thread_info {
	33	struct task_struct task; / main task structure */
	34	struct exec_domain exec_domain; / execution domain */
	35	unsigned long flags; /* low level flags */
	36	unsigned long status; /* thread-synchronous flags */
	37	__u32 cpu; /* current CPU */
dcd497f9	38	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	39
	40	mm_segment_t addr_limit; /* thread address space:
	41	0-0xBFFFFFFF for user-thead
	42	0-0xFFFFFFFF for kernel-thread
	43	*/
	44	struct restart_block restart_block;
	45
	46	__u8 supervisor_stack[0];
	47	};
	48
	49	#else /* !__ASSEMBLY__ */
	50
84e8cd6d	51	#include <asm/asm-offsets.h>
1da177e4 LT	52
	53	#endif
	54
8080f231	55	#define PREEMPT_ACTIVE 0x10000000
1da177e4 LT	56
	57	/*
	58	* macros/functions for gaining access to the thread information structure
	59	*
	60	* preempt_count needs to be 1 initially, until the scheduler is functional.
	61	*/
	62	#ifndef __ASSEMBLY__
	63
	64	#define INIT_THREAD_INFO(tsk) \
	65	{ \
	66	.task = &tsk, \
	67	.exec_domain = &default_exec_domain, \
	68	.flags = 0, \
	69	.cpu = 0, \
	70	.preempt_count = 1, \
	71	.addr_limit = KERNEL_DS, \
	72	.restart_block = { \
	73	.fn = do_no_restart_syscall, \
	74	}, \
	75	}
	76
	77	#define init_thread_info (init_thread_union.thread_info)
	78	#define init_stack (init_thread_union.stack)
	79
1da177e4 LT	80	/* how to get the thread information struct from C */
	81	register struct thread_info *__current_thread_info asm("gr15");
	82
	83	#define current_thread_info() ({ __current_thread_info; })
	84
	85	/* thread information allocation */
	86	#ifdef CONFIG_DEBUG_STACK_USAGE
	87	#define alloc_thread_info(tsk) \
	88	({ \
	89	struct thread_info *ret; \
	90	\
	91	ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
	92	if (ret) \
	93	memset(ret, 0, THREAD_SIZE); \
	94	ret; \
	95	})
	96	#else
	97	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
	98	#endif
	99
	100	#define free_thread_info(info) kfree(info)
1da177e4	101
84e8cd6d	102	#endif /* __ASSEMBLY__ */
1da177e4 LT	103
	104	/*
	105	* thread information flags
	106	* - these are process state flags that various assembly files may need to access
	107	* - pending work-to-be-done flags are in LSW
	108	* - other flags in MSW
	109	*/
	110	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	111	#define TIF_SIGPENDING 1 /* signal pending */
	112	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	113	#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */
	114	#define TIF_IRET 4 /* return with iret */
	115	#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
1da177e4 LT	116	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
1da177e4 LT	117	#define TIF_MEMDIE 17 /* OOM killer killed process */
8a102eed	118	#define TIF_FREEZE 18 /* freezing for suspend */
1da177e4 LT	119
1da177e4 LT	120	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
1da177e4 LT	121	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	122	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	123	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	124	#define _TIF_IRET (1 << TIF_IRET)
a411aee9	125	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
1da177e4	126	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
8a102eed	127	#define _TIF_FREEZE (1 << TIF_FREEZE)
1da177e4 LT	128
	129	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
	130	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
	131
	132	/*
	133	* Thread-synchronous status.
	134	*
	135	* This is different from the flags in that nobody else
	136	* ever touches our thread-synchronous status, so we don't
	137	* have to worry about atomic accesses.
	138	*/
	139	#define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */
	140
	141	#endif /* __KERNEL__ */
	142
	143	#endif /* _ASM_THREAD_INFO_H */