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efiacpi.c revision 1.11 
      1 /* $NetBSD: efiacpi.c,v 1.11 2021/10/06 10:13:19 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 (at) 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 #include "efiboot.h"
     33 #include "efiacpi.h"
     34 #include "smbios.h"
     35 
     36 struct acpi_rdsp {
     37 	char signature[8];
     38 	uint8_t checksum;
     39 	char oemid[6];
     40 	uint8_t revision;
     41 	uint32_t rsdtphys;
     42 	uint32_t length;
     43 	uint64_t xsdtphys;
     44 	uint8_t extcsum;
     45 	uint8_t reserved[3];
     46 };
     47 
     48 static EFI_GUID Acpi20TableGuid = ACPI_20_TABLE_GUID;
     49 static EFI_GUID Smbios3TableGuid = SMBIOS3_TABLE_GUID;
     50 static EFI_GUID SmbiosTableGuid = SMBIOS_TABLE_GUID;
     51 
     52 static int acpi_enable = 1;
     53 static void *acpi_root = NULL;
     54 static void *smbios_table = NULL;
     55 
     56 int
     57 efi_acpi_probe(void)
     58 {
     59 	EFI_STATUS status;
     60 
     61 	status = LibGetSystemConfigurationTable(&Acpi20TableGuid, &acpi_root);
     62 	if (EFI_ERROR(status))
     63 		return EIO;
     64 
     65 	status = LibGetSystemConfigurationTable(&Smbios3TableGuid, &smbios_table);
     66 	if (EFI_ERROR(status)) {
     67 		status = LibGetSystemConfigurationTable(&SmbiosTableGuid, &smbios_table);
     68 	}
     69 	if (EFI_ERROR(status)) {
     70 		smbios_table = NULL;
     71 	}
     72 
     73 	return 0;
     74 }
     75 
     76 int
     77 efi_acpi_available(void)
     78 {
     79 	return acpi_root != NULL;
     80 }
     81 
     82 int
     83 efi_acpi_enabled(void)
     84 {
     85 	return acpi_enable;
     86 }
     87 
     88 void
     89 efi_acpi_enable(int enable)
     90 {
     91 	acpi_enable = enable;
     92 }
     93 
     94 void *
     95 efi_acpi_root(void)
     96 {
     97 	return acpi_root;
     98 }
     99 
    100 void *
    101 efi_acpi_smbios(void)
    102 {
    103 	return smbios_table;
    104 }
    105 
    106 static char model_buf[128];
    107 
    108 const char *
    109 efi_acpi_get_model(void)
    110 {
    111 	struct smbtable smbios;
    112 	struct smbios_sys *psys;
    113 	const char *s;
    114 	char *buf;
    115 
    116 	memset(model_buf, 0, sizeof(model_buf));
    117 
    118 	if (smbios_table != NULL) {
    119 		smbios_init(smbios_table);
    120 
    121 		buf = model_buf;
    122 		smbios.cookie = 0;
    123 		if (smbios_find_table(SMBIOS_TYPE_SYSTEM, &smbios)) {
    124 			psys = smbios.tblhdr;
    125 			if ((s = smbios_get_string(&smbios, psys->vendor, buf, 64)) != NULL) {
    126 				buf += strlen(s);
    127 				*buf++ = ' ';
    128 			}
    129 			smbios_get_string(&smbios, psys->product, buf, 64);
    130 		}
    131 	}
    132 
    133 	if (model_buf[0] == '\0')
    134 		strcpy(model_buf, "ACPI");
    135 
    136 	return model_buf;
    137 }
    138 
    139 void
    140 efi_acpi_show(void)
    141 {
    142 	struct acpi_rdsp *rsdp = acpi_root;
    143 
    144 	if (!efi_acpi_available())
    145 		return;
    146 
    147 	printf("ACPI: v%02d %c%c%c%c%c%c\n", rsdp->revision,
    148 	    rsdp->oemid[0], rsdp->oemid[1], rsdp->oemid[2],
    149 	    rsdp->oemid[3], rsdp->oemid[4], rsdp->oemid[5]);
    150 
    151 	if (smbios_table)
    152 		printf("SMBIOS: %s\n", efi_acpi_get_model());
    153 }
    154