source: sbliveos2/trunk/lib32/spinlock.c

/* $Id: spinlock.c 188 2001-09-09 15:31:35Z sandervl $ */

//******************************************************************************
// 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>


unsigned long __lock(void);
#pragma aux __lock =            \
        "pushfd"                \
        "cli"                   \
        "pop eax"               \
        modify exact [eax]      \
        value [eax];


void __unlock(unsigned long cpuflags);
#pragma aux __unlock =          \
        "push eax"              \
        "popfd"                 \
        modify exact []         \
        parm [eax];



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

void spin_lock(spinlock_t *lock)
{
  *lock = __lock();
}

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