1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2000,2001 Michael Smith 5 * Copyright (c) 2000 BSDi 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/sysctl.h> 37 38 #include <contrib/dev/acpica/include/acpi.h> 39 #include <contrib/dev/acpica/include/aclocal.h> 40 #include <contrib/dev/acpica/include/actables.h> 41 42 static u_long acpi_root_phys; 43 44 SYSCTL_ULONG(_machdep, OID_AUTO, acpi_root, CTLFLAG_RD, &acpi_root_phys, 0, 45 "The physical address of the RSDP"); 46 47 ACPI_STATUS 48 AcpiOsInitialize(void) 49 { 50 51 return (AE_OK); 52 } 53 54 ACPI_STATUS 55 AcpiOsTerminate(void) 56 { 57 58 return (AE_OK); 59 } 60 61 static u_long 62 acpi_get_root_from_loader(void) 63 { 64 long acpi_root; 65 66 if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root)) 67 return (acpi_root); 68 69 /* 70 * The hints mechanism is unreliable (it fails if anybody ever 71 * compiled in hints to the kernel). It has been replaced 72 * by the tunable method, but is used here as a fallback to 73 * retain maximum compatibility between old loaders and new 74 * kernels. It can be removed after 11.0R. 75 */ 76 if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0) 77 return (acpi_root); 78 79 return (0); 80 } 81 82 static u_long 83 acpi_get_root_from_memory(void) 84 { 85 ACPI_PHYSICAL_ADDRESS acpi_root; 86 87 if (ACPI_SUCCESS(AcpiFindRootPointer(&acpi_root))) 88 return (acpi_root); 89 90 return (0); 91 } 92 93 ACPI_PHYSICAL_ADDRESS 94 AcpiOsGetRootPointer(void) 95 { 96 97 if (acpi_root_phys == 0) { 98 acpi_root_phys = acpi_get_root_from_loader(); 99 if (acpi_root_phys == 0) 100 acpi_root_phys = acpi_get_root_from_memory(); 101 } 102 103 return (acpi_root_phys); 104 } 105