OsdEnvironment.c

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    1 /*-
    2  * Copyright (c) 2000,2001 Michael Smith
    3  * Copyright (c) 2000 BSDi
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.2/sys/x86/acpica/OsdEnvironment.c 316303 2017-03-30 20:18:34Z jkim $");
   30 
   31 #include <sys/types.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/sysctl.h>
   35 
   36 #include <contrib/dev/acpica/include/acpi.h>
   37 #include <contrib/dev/acpica/include/aclocal.h>
   38 #include <contrib/dev/acpica/include/actables.h>
   39 
   40 static u_long acpi_root_phys;
   41 
   42 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0,
   43     "The physical address of the RSDP");
   44 
   45 ACPI_STATUS
   46 AcpiOsInitialize(void)
   47 {
   48 
   49         return (AE_OK);
   50 }
   51 
   52 ACPI_STATUS
   53 AcpiOsTerminate(void)
   54 {
   55 
   56         return (AE_OK);
   57 }
   58 
   59 static u_long
   60 acpi_get_root_from_loader(void)
   61 {
   62         long acpi_root;
   63 
   64         if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
   65                 return (acpi_root);
   66 
   67         /*
   68          * The hints mechanism is unreliable (it fails if anybody ever
   69          * compiled in hints to the kernel). It has been replaced
   70          * by the tunable method, but is used here as a fallback to
   71          * retain maximum compatibility between old loaders and new
   72          * kernels. It can be removed after 11.0R.
   73          */
   74         if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
   75                 return (acpi_root);
   76 
   77         return (0);
   78 }
   79 
   80 static u_long
   81 acpi_get_root_from_memory(void)
   82 {
   83         ACPI_PHYSICAL_ADDRESS acpi_root;
   84 
   85         if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root)))
   86                 return (acpi_root);
   87 
   88         return (0);
   89 }
   90 
   91 ACPI_PHYSICAL_ADDRESS
   92 AcpiOsGetRootPointer(void)
   93 {
   94 
   95         if (acpi_root_phys == 0) {
   96                 acpi_root_phys = acpi_get_root_from_loader();
   97                 if (acpi_root_phys == 0)
   98                         acpi_root_phys = acpi_get_root_from_memory();
   99         }
  100 
  101         return (acpi_root_phys);
  102 }

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

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