OsdEnvironment.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000,2001 Michael Smith
    5  * Copyright (c) 2000 BSDi
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/bus.h>
   35 #include <sys/kernel.h>
   36 #include <sys/sysctl.h>
   37 
   38 #include <contrib/dev/acpica/include/acpi.h>
   39 #include <contrib/dev/acpica/include/aclocal.h>
   40 #include <contrib/dev/acpica/include/actables.h>
   41 
   42 static u_long acpi_root_phys;
   43 
   44 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
   45     "The physical address of the RSDP");
   46 
   47 ACPI_STATUS
   48 AcpiOsInitialize(void)
   49 {
   50 
   51         return (AE_OK);
   52 }
   53 
   54 ACPI_STATUS
   55 AcpiOsTerminate(void)
   56 {
   57 
   58         return (AE_OK);
   59 }
   60 
   61 static u_long
   62 acpi_get_root_from_loader(void)
   63 {
   64         long acpi_root;
   65 
   66         if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
   67                 return (acpi_root);
   68 
   69         return (0);
   70 }
   71 
   72 static u_long
   73 acpi_get_root_from_memory(void)
   74 {
   75         ACPI_PHYSICAL_ADDRESS acpi_root;
   76 
   77         if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root)))
   78                 return (acpi_root);
   79 
   80         return (0);
   81 }
   82 
   83 ACPI_PHYSICAL_ADDRESS
   84 AcpiOsGetRootPointer(void)
   85 {
   86 
   87         if (acpi_root_phys == 0) {
   88                 acpi_root_phys = acpi_get_root_from_loader();
   89                 if (acpi_root_phys == 0)
   90                         acpi_root_phys = acpi_get_root_from_memory();
   91         }
   92 
   93         return (acpi_root_phys);
   94 }

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FreeBSD/Linux Kernel Cross Reference sys/x86/acpica/OsdEnvironment.c

FreeBSD/Linux Kernel Cross Reference
sys/x86/acpica/OsdEnvironment.c