OsdEnvironment.c revision 215023
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: head/sys/amd64/acpica/OsdEnvironment.c 215023 2010-11-09 00:14:39Z jkim $"); 30 31#include <sys/types.h> 32#include <sys/bus.h> 33#include <sys/linker_set.h> 34#include <sys/sysctl.h> 35 36#include <contrib/dev/acpica/include/acpi.h> 37#include <contrib/dev/acpica/include/actables.h> 38 39static u_long acpi_root_phys; 40 41SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0, 42 "The physical address of the RSDP"); 43 44ACPI_STATUS 45AcpiOsInitialize(void) 46{ 47 48 return (AE_OK); 49} 50 51ACPI_STATUS 52AcpiOsTerminate(void) 53{ 54 55 return (AE_OK); 56} 57 58static u_long 59acpi_get_root_from_loader(void) 60{ 61 long acpi_root; 62 63 if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0) 64 return (acpi_root); 65 66 return (0); 67} 68 69static u_long 70acpi_get_root_from_memory(void) 71{ 72 ACPI_SIZE acpi_root; 73 74 if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root))) 75 return (acpi_root); 76 77 return (0); 78} 79 80ACPI_PHYSICAL_ADDRESS 81AcpiOsGetRootPointer(void) 82{ 83 84 if (acpi_root_phys == 0) { 85 acpi_root_phys = acpi_get_root_from_loader(); 86 if (acpi_root_phys == 0) 87 acpi_root_phys = acpi_get_root_from_memory(); 88 } 89 90 return (acpi_root_phys); 91} 92