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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/nios2/include/asm/thread_info.h
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/*

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 * NiosII low-level thread information

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 *

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 * Copyright (C) 2011 Tobias Klauser <[email protected]>

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 * Copyright (C) 2004 Microtronix Datacom Ltd.

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 *

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 * Based on asm/thread_info_no.h from m68k which is:

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 *

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 * Copyright (C) 2002 David Howells <[email protected]>

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 */

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#ifndef _ASM_NIOS2_THREAD_INFO_H

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#define _ASM_NIOS2_THREAD_INFO_H

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#ifdef __KERNEL__

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/*

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 * Size of the kernel stack for each process.

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 */

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#define THREAD_SIZE_ORDER	1

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#define THREAD_SIZE		8192 /* 2 * PAGE_SIZE */

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#ifndef __ASSEMBLY__

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/*

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 * low level task data that entry.S needs immediate access to

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 * - this struct should fit entirely inside of one cache line

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 * - this struct shares the supervisor stack pages

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 * - if the contents of this structure are changed, the assembly constants

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 *   must also be changed

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 */

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struct thread_info {

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	struct task_struct	*task;		/* main task structure */

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	unsigned long		flags;		/* low level flags */

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	__u32			cpu;		/* current CPU */

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

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	struct pt_regs		*regs;

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};

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/*

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

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 *

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 * preempt_count needs to be 1 initially, until the scheduler is functional.

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 */

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#define INIT_THREAD_INFO(tsk)			\

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{						\

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	.task		= &tsk,			\

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	.flags		= 0,			\

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	.cpu		= 0,			\

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	.preempt_count	= INIT_PREEMPT_COUNT,	\

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}

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/* how to get the thread information struct from C */

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static inline struct thread_info *current_thread_info(void)

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{

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	register unsigned long sp asm("sp");

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	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));

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}

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#endif /* !__ASSEMBLY__ */

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/*

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 * thread information flags

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 * - these are process state flags that various assembly files may need to

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 *   access

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 * - pending work-to-be-done flags are in LSW

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 * - other flags in MSW

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 */

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#define TIF_SYSCALL_TRACE	0	/* syscall trace active */

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#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */

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#define TIF_SIGPENDING		2	/* signal pending */

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#define TIF_NEED_RESCHED	3	/* rescheduling necessary */

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#define TIF_MEMDIE		4	/* is terminating due to OOM killer */

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#define TIF_SECCOMP		5	/* secure computing */

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#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */

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#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */

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

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#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling

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					   TIF_NEED_RESCHED */

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#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

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#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)

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#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)

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#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)

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#define _TIF_SECCOMP		(1 << TIF_SECCOMP)

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#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)

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#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)

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#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)

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#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)

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

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#define _TIF_WORK_MASK		0x0000FFFE

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#endif /* __KERNEL__ */

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#endif /* _ASM_NIOS2_THREAD_INFO_H */

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