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/linker_set.h>
   36 #include <sys/sysctl.h>
   37 
   38 #include <contrib/dev/acpica/acpi.h>
   39 
   40 static u_long i386_acpi_root;
   41 
   42 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &i386_acpi_root, 0,
   43              "The physical address of the RSDP");
   44 
   45 ACPI_STATUS
   46 AcpiOsInitialize(void)
   47 {
   48         return(0);
   49 }
   50 
   51 ACPI_STATUS
   52 AcpiOsTerminate(void)
   53 {
   54         return(0);
   55 }
   56 
   57 ACPI_STATUS
   58 AcpiOsGetRootPointer(UINT32 Flags, ACPI_POINTER *RsdpPhysicalAddress)
   59 {
   60         ACPI_POINTER ptr;
   61         ACPI_STATUS status;
   62 
   63         if (i386_acpi_root == 0) {
   64                 /*
   65                  * The loader passes the physical address at which it found the
   66                  * RSDP in a hint.  We could recover this rather than searching
   67                  * manually here.
   68                  */
   69                 status = AcpiFindRootPointer(Flags, &ptr);
   70                 if (status == AE_OK)
   71                         i386_acpi_root = ptr.Pointer.Physical;
   72         } else
   73                 status = AE_OK;
   74 
   75         RsdpPhysicalAddress->PointerType = ACPI_PHYSICAL_POINTER;
   76         RsdpPhysicalAddress->Pointer.Physical = i386_acpi_root;
   77         return (status);
   78 }

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