root/include/asm-um/thread_info.h

INCLUDED FROM

DEFINITIONS

1. current_thread_info

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#ifndef __UM_THREAD_INFO_H
#define __UM_THREAD_INFO_H

#ifndef __ASSEMBLY__

#include <asm/types.h>
#include <asm/page.h>
#include <asm/uaccess.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 */
        int                     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;
        struct thread_info      *real_thread;    /* Points to non-IRQ stack */
};

#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,   \
        },                                      \
        .real_thread = NULL,                    \
}

#define init_thread_info        (init_thread_union.thread_info)
#define init_stack              (init_thread_union.stack)

#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
/* 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 = THREAD_SIZE - 1;
        ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
        return ti;
}

#define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER

#endif

#define PREEMPT_ACTIVE          0x10000000

#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_MEMDIE              5
#define TIF_SYSCALL_AUDIT       6
#define TIF_RESTORE_SIGMASK     7

#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_MEMDIE             (1 << TIF_MEMDIE)
#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
#define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)

#endif