The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/acpica/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("$FreeBSD$");
   30 
   31 /*
   32  * 6.1 : Environmental support
   33  */
   34 #include <sys/types.h>
   35 #include <sys/bus.h>
   36 #include <sys/sysctl.h>
   37 
   38 #include <contrib/dev/acpica/include/acpi.h>
   39 #include <contrib/dev/acpica/include/actables.h>
   40 
   41 static u_long i386_acpi_root;
   42 
   43 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &i386_acpi_root, 0,
   44              "The physical address of the RSDP");
   45 
   46 ACPI_STATUS
   47 AcpiOsInitialize(void)
   48 {
   49         return(0);
   50 }
   51 
   52 ACPI_STATUS
   53 AcpiOsTerminate(void)
   54 {
   55         return(0);
   56 }
   57 
   58 ACPI_PHYSICAL_ADDRESS
   59 AcpiOsGetRootPointer(void)
   60 {
   61         u_long  ptr;
   62 
   63         if (i386_acpi_root == 0 &&
   64             (resource_long_value("acpi", 0, "rsdp", (long *)&ptr) == 0 ||
   65             AcpiFindRootPointer((ACPI_SIZE *)&ptr) == AE_OK) &&
   66             ptr != 0)
   67                 i386_acpi_root = ptr;
   68 
   69         return (i386_acpi_root);
   70 }

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