/******************************************************************************

 * preempt.c

 * 

 * Track atomic regions in the hypervisor which disallow sleeping.

 * 

 * Copyright (c) 2010, Keir Fraser <keir@xen.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 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, see <http://www.gnu.org/licenses/>.

 */

#include <xen/preempt.h>

#include <xen/irq.h>

#include <asm/system.h>

DEFINE_PER_CPU(unsigned int, __preempt_count);

bool_t in_atomic(void)

{

    return preempt_count() || in_irq() || !local_irq_is_enabled();

}

#ifndef NDEBUG

void ASSERT_NOT_IN_ATOMIC(void)

{

    ASSERT(!preempt_count());

    ASSERT(!in_irq());

    ASSERT(local_irq_is_enabled());

}

#endif