1 /* $NetBSD: acpi_table.c,v 1.1 2018/10/12 22:15:04 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 1.1 2018/10/12 22:15:04 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 54 ACPI_STATUS 55 acpi_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 = header->Length; 65 acpi_md_OsUnmapMemory(header, sizeof(*header)); 66 67 return acpi_md_OsMapMemory(pa, length, hdrp); 68 } 69 70 void 71 acpi_table_unmap(ACPI_TABLE_HEADER *hdrp) 72 { 73 acpi_md_OsUnmapMemory(hdrp, hdrp->Length); 74 } 75 76 ACPI_STATUS 77 acpi_table_find(const char *sig, void **hdrp) 78 { 79 ACPI_TABLE_RSDP *rsdp; 80 ACPI_TABLE_XSDT *xsdt; 81 ACPI_TABLE_HEADER *header; 82 ACPI_PHYSICAL_ADDRESS pa; 83 ACPI_STATUS rv; 84 85 /* RDSP contains a pointer to the XSDT */ 86 pa = 0; 87 rv = acpi_md_OsMapMemory(acpi_md_OsGetRootPointer(), sizeof(*rsdp), (void **)&rsdp); 88 if (ACPI_FAILURE(rv)) 89 return rv; 90 if (memcmp(rsdp->Signature, ACPI_SIG_RSDP, sizeof(rsdp->Signature)) == 0) 91 pa = rsdp->XsdtPhysicalAddress; 92 acpi_md_OsUnmapMemory(rsdp, sizeof(*rsdp)); 93 if (pa == 0) 94 return AE_NOT_FOUND; 95 96 /* XSDT contains pointers to other tables */ 97 rv = acpi_table_map(pa, (void **)&xsdt); 98 if (ACPI_FAILURE(rv)) 99 return rv; 100 const u_int entries = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) / ACPI_XSDT_ENTRY_SIZE; 101 for (u_int n = 0; n < entries; n++) { 102 rv = acpi_table_map(xsdt->TableOffsetEntry[n], (void **)&header); 103 if (ACPI_FAILURE(rv)) 104 continue; 105 if (memcmp(header->Signature, sig, sizeof(header->Signature)) == 0) { 106 acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt); 107 *hdrp = header; 108 return AE_OK; 109 } 110 } 111 112 /* Not found */ 113 acpi_table_unmap((ACPI_TABLE_HEADER *)xsdt); 114 return AE_NOT_FOUND; 115 } 116