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thread_info.h

/*
 * File:         include/asm-blackfin/thread_info.h
 * Based on:     include/asm-m68knommu/thread_info.h
 * Author:       LG Soft India
 *               Copyright (C) 2004-2005 Analog Devices Inc.
 * Created:      Tue Sep 21 2004
 * Description:  Blackfin low-level thread information
 * Modified:
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#include <asm/page.h>
#include <asm/entry.h>
#include <asm/l1layout.h>
#include <linux/compiler.h>

#ifdef __KERNEL__

/* Thread Align Mask to reach to the top of the stack
 * for any process
 */
#define ALIGN_PAGE_MASK         0xffffe000

/*
 * Size of kernel stack for each process. This must be a power of 2...
 */
#define THREAD_SIZE_ORDER     1
#define THREAD_SIZE           8192  /* 2 pages */

#ifndef __ASSEMBLY__

typedef unsigned long mm_segment_t;

/*
 * low level task data.
 * If you change this, change the TI_* offsets below to match.
 */

struct thread_info {
      struct task_struct *task;     /* main task structure */
      struct exec_domain *exec_domain;    /* execution domain */
      unsigned long flags;    /* low level flags */
      int cpu;          /* cpu we're on */
      int preempt_count;      /* 0 => preemptable, <0 => BUG */
      mm_segment_t addr_limit;      /* address limit */
      struct restart_block restart_block;
      struct l1_scratch_task_info l1_task_info;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .preempt_count  = 1,                    \
      .restart_block    = {               \
            .fn = do_no_restart_syscall,  \
      },                            \
}
#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)

/* Given a task stack pointer, you can find its corresponding
 * thread_info structure just by masking it to the THREAD_SIZE
 * boundary (currently 8K as you can see above).
 */
__attribute_const__
static inline struct thread_info *current_thread_info(void)
{
      struct thread_info *ti;
      __asm__("%0 = sp;": "=&d"(ti):
      );
      return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
}

#endif                        /* __ASSEMBLY__ */

/*
 * Offsets in thread_info structure, used in assembly code
 */
#define TI_TASK         0
#define TI_EXECDOMAIN   4
#define TI_FLAGS  8
#define TI_CPU          12
#define TI_PREEMPT      16

#define     PREEMPT_ACTIVE    0x4000000

/*
 * thread information flag bit numbers
 */
#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_MEMDIE              4
#define TIF_RESTORE_SIGMASK   5     /* restore signal mask in do_signal() */
#define TIF_FREEZE              6       /* is freezing for suspend */

/* as above, but as bit values */
#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_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#define _TIF_FREEZE             (1<<TIF_FREEZE)

#define _TIF_WORK_MASK        0x0000FFFE  /* work to do on interrupt/exception return */

#endif                        /* __KERNEL__ */

#endif                        /* _ASM_THREAD_INFO_H */

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