thread_info.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 92 行

/* 
 * Copyright (C) 2002 Jeff Dike ([e-mail])
 * Licensed under the GPL
 */

#ifndef __UM_THREAD_INFO_H
#define __UM_THREAD_INFO_H

#ifndef __ASSEMBLY__

#include <asm/processor.h>
#include <asm/types.h>

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	__u32			cpu;		/* current CPU */
	__s32			preempt_count;  /* 0 => preemptable, 
						   <0 => BUG */
	mm_segment_t		addr_limit;	/* thread address space:
					 	   0-0xBFFFFFFF for user
						   0-0xFFFFFFFF for kernel */
	struct restart_block    restart_block;
};

#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 */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
	unsigned long mask = PAGE_SIZE *
		(1 << CONFIG_KERNEL_STACK_ORDER) - 1;
	__asm__("andl %%esp,%0; ":"=r" (ti) : "0" (~mask));
	return ti;
}

/* thread information allocation */
#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
#define alloc_thread_info(tsk) \
	((struct thread_info *) kmalloc(THREAD_SIZE, GFP_KERNEL))
#define free_thread_info(ti) kfree(ti)

#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif

#define PREEMPT_ACTIVE		0x4000000

#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_RESTART_BLOCK 	4

#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_RESTART_BLOCK	(1 << TIF_RESTART_BLOCK)

#endif

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */