/*      $NetBSD: OsdSchedule.c,v 1.21 2026/05/16 18:14:42 andvar Exp $  */

/*
 * Copyright 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * OS Services Layer
 *
 * 6.3: Scheduling services
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: OsdSchedule.c,v 1.21 2026/05/16 18:14:42 andvar Exp $");

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/condvar.h>
#include <sys/mutex.h>

#include <dev/acpi/acpica.h>

#include <dev/acpi/acpi_osd.h>

#include <dev/sysmon/sysmon_taskq.h>

extern int acpi_suspended;

#define _COMPONENT      ACPI_OS_SERVICES
ACPI_MODULE_NAME("SCHEDULE")

static kcondvar_t       acpi_osd_sleep_cv;
static kmutex_t         acpi_osd_sleep_mtx;

/*
 * acpi_osd_sched_init:
 *
 *      Initialize the ACPICA Osd scheduler.  Called from AcpiOsInitialize().
 */
void
acpi_osd_sched_init(void)
{
        sysmon_task_queue_init();
        mutex_init(&acpi_osd_sleep_mtx, MUTEX_DEFAULT, IPL_NONE);
        cv_init(&acpi_osd_sleep_cv, "acpislp");
}

/*
 * AcpiOsGetThreadId:
 *
 *      Obtain the ID of the currently executing thread.
 */
ACPI_THREAD_ID
AcpiOsGetThreadId(void)
{
        return (ACPI_THREAD_ID)(uintptr_t)curlwp;
}

/*
 * AcpiOsQueueForExecution:
 *
 *      Schedule a procedure for deferred execution.
 */
ACPI_STATUS
AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
    void *Context)
{
        int pri;

        /*
         * If you raise any priority here make sure to adjust
         * AcpiOsWaitEventsComplete too.
         */
        switch (Type) {
        case OSL_GPE_HANDLER:
                pri = 10;
                break;
        case OSL_GLOBAL_LOCK_HANDLER:
        case OSL_EC_POLL_HANDLER:
        case OSL_EC_BURST_HANDLER:
                pri = 5;
                break;
        case OSL_NOTIFY_HANDLER:
                pri = 3;
                break;
        default:
                return AE_BAD_PARAMETER;
        }

        switch (sysmon_task_queue_sched(pri, Function, Context)) {
        case 0:
                return AE_OK;

        case ENOMEM:
                return AE_NO_MEMORY;

        default:
                return AE_BAD_PARAMETER;
        }
}

/*
 * AcpiOsSleep:
 *
 *      Suspend the running task (coarse granularity).
 */
void
AcpiOsSleep(ACPI_INTEGER Milliseconds)
{

        if (cold || doing_shutdown || acpi_suspended)
                DELAY(Milliseconds * 1000);
        else {
                mutex_enter(&acpi_osd_sleep_mtx);
                cv_timedwait_sig(&acpi_osd_sleep_cv, &acpi_osd_sleep_mtx,
                    MAX(mstohz(Milliseconds), 1));
                mutex_exit(&acpi_osd_sleep_mtx);
        }
}

/*
 * AcpiOsStall:
 *
 *      Suspend the running task (fine granularity).
 */
void
AcpiOsStall(UINT32 Microseconds)
{

        delay(Microseconds);
}

/*
 * AcpiOsGetTimer:
 *
 *      Get the current system time in 100 nanosecond units
 */
UINT64
AcpiOsGetTimer(void)
{
        static UINT64 xt;
        struct timeval tv;
        UINT64 t;

        /* XXX During early boot there is no (decent) timer available yet. */
        if (cold) {
                return xt += 100;
        }

        microtime(&tv);
        t = (UINT64)10 * tv.tv_usec;
        t += (UINT64)10000000 * tv.tv_sec;

        return t;
}

/*
 * AcpiOsWaitEventsComplete:
 *
 *      Wait for all asynchronous events to complete.
 */
void
AcpiOsWaitEventsComplete(void)
{
        /* Highest priority used by AcpiOsExecute.  */
        sysmon_task_queue_barrier(10);
}