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 #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/actables.h> 38 39 static u_long acpi_root_phys; 40 41 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0, 42 "The physical address of the RSDP"); 43 44 ACPI_STATUS 45 AcpiOsInitialize(void) 46 { 47 48 return (AE_OK); 49 } 50 51 ACPI_STATUS 52 AcpiOsTerminate(void) 53 { 54 55 return (AE_OK); 56 } 57 58 static u_long 59 acpi_get_root_from_loader(void) 60 { 61 long acpi_root; 62 63 if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root)) 64 return (acpi_root); 65 66 /* 67 * The hints mechanism is unreliable (it fails if anybody ever 68 * compiled in hints to the kernel). It has been replaced 69 * by the tunable method, but is used here as a fallback to 70 * retain maximum compatibility between old loaders and new 71 * kernels. It can be removed after 11.0R. 72 */ 73 if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0) 74 return (acpi_root); 75 76 return (0); 77 } 78 79 static u_long 80 acpi_get_root_from_memory(void) 81 { 82 ACPI_PHYSICAL_ADDRESS acpi_root; 83 84 if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root))) 85 return (acpi_root); 86 87 return (0); 88 } 89 90 ACPI_PHYSICAL_ADDRESS 91 AcpiOsGetRootPointer(void) 92 { 93 94 if (acpi_root_phys == 0) { 95 acpi_root_phys = acpi_get_root_from_loader(); 96 if (acpi_root_phys == 0) 97 acpi_root_phys = acpi_get_root_from_memory(); 98 } 99 100 return (acpi_root_phys); 101 } 102