FreeBSD/Linux Kernel Cross Reference
sys/arm64/acpica/OsdEnvironment.c

     /*-
      * Copyright (c) 2000,2001 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/types.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/sysctl.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/aclocal.h>
    #include <contrib/dev/acpica/include/actables.h>
    
    static u_long acpi_root_phys;
    
    SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
        "The physical address of the RSDP");
    
    ACPI_STATUS
    AcpiOsInitialize(void)
    {
    
            return (AE_OK);
    }
    
    ACPI_STATUS
    AcpiOsTerminate(void)
    {
    
            return (AE_OK);
    }
    
    static u_long
    acpi_get_root_from_loader(void)
    {
            long acpi_root;
    
            if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
                    return (acpi_root);
    
            /*
             * The hints mechanism is unreliable (it fails if anybody ever
             * compiled in hints to the kernel). It has been replaced
             * by the tunable method, but is used here as a fallback to
             * retain maximum compatibility between old loaders and new
             * kernels. It can be removed after 14.0R.
             */
            if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
                    return (acpi_root);
    
            return (0);
    }
    
    ACPI_PHYSICAL_ADDRESS
    AcpiOsGetRootPointer(void)
    {
    
            if (acpi_root_phys == 0)
                    acpi_root_phys = acpi_get_root_from_loader();
    
            return (acpi_root_phys);
    }

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