sys/platform/pc64/acpica5/OsdEnvironment.c

   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  * $FreeBSD: src/sys/i386/acpica/OsdEnvironment.c,v 1.10 2004/05/06 02:18:58 njl Exp $
  28  * $DragonFly: src/sys/platform/pc32/acpica5/OsdEnvironment.c,v 1.3 2007/01/17 17:31:19 y0netan1 Exp $
  29  */
  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 "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_PHYSICAL_ADDRESS
  58 AcpiOsGetRootPointer(void)
  59 {
  60         ACPI_NATIVE_UINT 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(&ptr);
  70                 if (status == AE_OK)
  71                         i386_acpi_root = ptr;
  72         }
  73
  74         return (i386_acpi_root);
  75 }