acpi_table.c revision 1.2
1/* $NetBSD: acpi_table.c,v 1.2 2020/09/13 21:41:17 jmcneill Exp $ */ 2 3/*- 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jared McNeill <jmcneill@invisible.ca>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * ACPI table functions for use in early boot before ACPICA can be safely 34 * initialized. 35 */ 36 37#include <sys/cdefs.h> 38__KERNEL_RCSID(0, "$NetBSD: acpi_table.c,v 1.2 2020/09/13 21:41:17 jmcneill Exp $"); 39 40#include <sys/param.h> 41#include <sys/bus.h> 42#include <sys/cpu.h> 43#include <sys/device.h> 44 45#include <uvm/uvm_extern.h> 46 47#include <dev/acpi/acpireg.h> 48#include <dev/acpi/acpivar.h> 49 50#include <machine/acpi_machdep.h> 51 52#include <arch/arm/acpi/acpi_table.h> 53 54ACPI_STATUS 55acpi_table_map(ACPI_PHYSICAL_ADDRESS pa, void **hdrp) 56{ 57 ACPI_TABLE_HEADER *header; 58 ACPI_STATUS rv; 59 UINT32 length; 60 61 rv = acpi_md_OsMapMemory(pa, sizeof(*header), (void **)&header); 62 if (ACPI_FAILURE(rv)) 63 return rv; 64 length = le32toh(header->Length); 65 66 acpi_md_OsUnmapMemory(header, sizeof(*header)); 67 68 return acpi_md_OsMapMemory(pa, length, hdrp); 69} 70 71void 72acpi_table_unmap(ACPI_TABLE_HEADER *hdrp) 73{ 74 acpi_md_OsUnmapMemory(hdrp, le32toh(hdrp->Length)); 75} 76 77ACPI_STATUS 78acpi_table_find(const char *sig, void **hdrp) 79{ 80 ACPI_TABLE_RSDP *rsdp; 81 ACPI_TABLE_XSDT *xsdt; 82 ACPI_TABLE_HEADER *header; 83 ACPI_PHYSICAL_ADDRESS pa; 84 ACPI_STATUS rv; 85 86 /* RDSP contains a pointer to the XSDT */ 87 pa = 0; 88 rv = acpi_md_OsMapMemory(acpi_md_OsGetRootPointer(), sizeof(*rsdp), (void **)&rsdp); 89 if (ACPI_FAILURE(rv)) 90 return rv; 91 if (memcmp(rsdp->Signature, ACPI_SIG_RSDP, sizeof(rsdp->Signature)) == 0) 92 pa = le64toh(rsdp->XsdtPhysicalAddress); 93 acpi_md_OsUnmapMemory(rsdp, sizeof(*rsdp)); 94 if (pa == 0) 95 return AE_NOT_FOUND; 96 97 /* XSDT contains pointers to other tables */ 98 rv = acpi_table_map(pa, (void **)&xsdt); 99 if (ACPI_FAILURE(rv)) 100 return rv; 101 const u_int entries = (le32toh(xsdt->Header.Length) - sizeof(ACPI_TABLE_HEADER)) / ACPI_XSDT_ENTRY_SIZE; 102 for (u_int n = 0; n < entries; n++) { 103 rv = acpi_table_map(le64toh(xsdt->TableOffsetEntry[n]), (void **)&header); 104 if (ACPI_FAILURE(rv)) 105 continue; 106 if (memcmp(header->Signature, sig, sizeof(header->Signature)) == 0) { 107 acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt); 108 109 *hdrp = header; 110 return AE_OK; 111 } 112 } 113 114 /* Not found */ 115 acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt); 116 return AE_NOT_FOUND; 117} 118