source: trunk/kernel/arch/ibmpc/rt_timer.c @ 81

/*
 * rt_timer.c - real-time timer related operations
 *
 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-kernel.
 *
 * ALMOS-kernel 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; version 2.0 of the License.
 *
 * ALMOS-kernel 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 ALMOS-kernel; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <types.h>
#include <rt_timer.h>
#include <cpu.h>
#include <chdev.h>
#include <driver.h>
#include <sysio.h>
#include <thread.h>
#include <kmem.h>

extern struct device_s rt_timer;

static void timer_irq_handler (struct irq_action_s *action)
{
        register struct cpu_s *cpu;
        register struct thread_s *this;
   
        this = CURRENT_THREAD;
        cpu = this->local_cpu;

        if(this->type == PTHREAD)
        {
                MEM_CHECK(this->info.usr_stack_base);
        }
   
        MEM_CHECK(this->info.sys_stack_base);
   
        cpu->alarm_mgr.action.irq_handler(&cpu->alarm_mgr.action);

        cpu->tics_nr ++;
        cpu->tics_count ++;
        sched_clock(this);
}

/** Initialize Real-Time timer source */
error_t rt_timer_init(uint_t period, uint_t withIrq)
{
        rt_timer.irq = 0;
        rt_timer.action.irq_handler = &timer_irq_handler;
        rt_timer.type = DEV_TIMER;

        strcpy(rt_timer.name, "TIMER");
        metafs_init(&rt_timer.node, rt_timer.name);

        return 0;
}

/** Read Real-Time timer current value  */
error_t rt_timer_read(uint_t *time)
{
        *time = CURRENT_THREAD->local_cpu->tics_nr * 20;
        return 0;
}

/** Set Real-Time timer's current value */
error_t rt_timer_set(uint_t time)
{
        return 0;
}

/** Set Real-Time timer's period */
error_t rt_timer_setperiod(uint_t period)
{
        return 0;
}

/** Send commands to Real-Time timer device */
error_t rt_timer_ctrl(struct rt_params_s *param)
{
        switch(param->rt_cmd)
        {
        case RT_TIMER_STOP:
                //rt_timer.op.timer.stop(&rt_timer);
                return 0;

        case RT_TIMER_RUN:
                //rt_timer.op.timer.run(&rt_timer, (uint_t)rt_timer.data);
                return 0;

        default:
                return -1;
        }
}