source: sbliveos2/trunk/lib32/spinlock.c@ 172

/* $Id: spinlock.c 142 2000-04-23 14:55:46Z ktk $ */

//******************************************************************************
// OS/2 implementation of Linux spinlock kernel services
//
// Copyright 2000 Sander van Leeuwen (sandervl@xs4all.nl)
//
//     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 of
//     the License, 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; if not, write to the Free
//     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
//     USA.
//
//******************************************************************************
#include "hwaccess.h"
#include <linux/init.h>
#include <linux/poll.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>

void spin_lock_init(spinlock_t *lock)
{
  *lock = 0;
}

void spin_lock(spinlock_t *lock)
{
  unsigned long cpuflags;

  _asm {
        pushfd
        pop eax
        mov [cpuflags], eax
        cli
  }
  *lock = cpuflags;
}

void spin_lock_flag(spinlock_t *lock, unsigned long *flag)
{
  spin_lock(lock);
}

#if 0
int spin_trylock(spinlock_t *lock)
{
  return 0;
}

void spin_unlock_wait(spinlock_t *lock)
{

}
#endif

void spin_unlock(spinlock_t *lock)
{
 unsigned long cpuflags = *lock;

  _asm {
        mov  eax, [cpuflags]
        push eax
        popfd
  }
}