HelenOS sources

root/kernel/generic/src/lib/halt.c

DEFINITIONS

1. halt

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup kernel_generic
 * @{
 */

/**
 * @file
 * @brief Halt function.
 */

#include <stdbool.h>
#include <halt.h>
#include <log.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <console/kconsole.h>

/** Halt flag */
atomic_bool haltstate = false;

/** Halt wrapper
 *
 * Set halt flag and halt the CPU.
 *
 */
void halt(void)
{
#if (defined(CONFIG_DEBUG)) && (defined(CONFIG_KCONSOLE))
        bool rundebugger = false;

        if (!atomic_load(&haltstate)) {
                atomic_store(&haltstate, true);
                rundebugger = true;
        }
#else
        atomic_store(&haltstate, true);
#endif

        interrupts_disable();

#if (defined(CONFIG_DEBUG)) && (defined(CONFIG_KCONSOLE))
        if ((rundebugger) && (kconsole_check_poll()))
                kconsole("panic", "\nLast resort kernel console ready.\n", false);
#endif

        if (CPU)
                log(LF_OTHER, LVL_NOTE, "cpu%u: halted", CPU->id);
        else
                log(LF_OTHER, LVL_NOTE, "cpu: halted");

        cpu_halt();
}

/** @}
 */