thread_info.h

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/*
 * 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 = INIT_PREEMPT_COUNT,    \
    .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;
    void *p;

    asm volatile ("" : "=r" (p) : "0" (&ti));
    ti = (struct thread_info *) (((unsigned long)p) & ~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_RESTART_BLOCK   4
#define TIF_MEMDIE      5   /* is terminating due to OOM killer */
#define TIF_SYSCALL_AUDIT   6
#define TIF_RESTORE_SIGMASK 7
#define TIF_NOTIFY_RESUME   8

#define _TIF_SYSCALL_TRACE  (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING     (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED   (1 << TIF_NEED_RESCHED)
#define _TIF_MEMDIE     (1 << TIF_MEMDIE)
#define _TIF_SYSCALL_AUDIT  (1 << TIF_SYSCALL_AUDIT)

#endif