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      1 /* $NetBSD: efiacpi.c,v 1.13 2022/08/14 11:26:41 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 void *acpi_root = NULL;
     53 static void *smbios_table = NULL;
     54 
     55 static int acpi_enabled = 1;
     56 
     57 int
     58 efi_acpi_probe(void)
     59 {
     60 	EFI_STATUS status;
     61 
     62 	status = LibGetSystemConfigurationTable(&Acpi20TableGuid, &acpi_root);
     63 	if (EFI_ERROR(status))
     64 		return EIO;
     65 
     66 	status = LibGetSystemConfigurationTable(&Smbios3TableGuid, &smbios_table);
     67 	if (EFI_ERROR(status)) {
     68 		status = LibGetSystemConfigurationTable(&SmbiosTableGuid, &smbios_table);
     69 	}
     70 	if (EFI_ERROR(status)) {
     71 		smbios_table = NULL;
     72 	}
     73 
     74 	return 0;
     75 }
     76 
     77 int
     78 efi_acpi_available(void)
     79 {
     80 	return acpi_root != NULL && acpi_enabled;
     81 }
     82 
     83 int
     84 efi_acpi_enabled(void)
     85 {
     86 	return acpi_enabled;
     87 }
     88 
     89 void *
     90 efi_acpi_root(void)
     91 {
     92 	return acpi_root;
     93 }
     94 
     95 void *
     96 efi_acpi_smbios(void)
     97 {
     98 	return smbios_table;
     99 }
    100 
    101 static char model_buf[128];
    102 
    103 void
    104 efi_acpi_enable(int val)
    105 {
    106 	if (acpi_root == NULL) {
    107 		printf("No ACPI node\n");
    108 	} else
    109 		acpi_enabled = val;
    110 }
    111 
    112 const char *
    113 efi_acpi_get_model(void)
    114 {
    115 	struct smbtable smbios;
    116 	struct smbios_sys *psys;
    117 	const char *s;
    118 	char *buf;
    119 
    120 	memset(model_buf, 0, sizeof(model_buf));
    121 
    122 	if (smbios_table != NULL) {
    123 		smbios_init(smbios_table);
    124 
    125 		buf = model_buf;
    126 		smbios.cookie = 0;
    127 		if (smbios_find_table(SMBIOS_TYPE_SYSTEM, &smbios)) {
    128 			psys = smbios.tblhdr;
    129 			if ((s = smbios_get_string(&smbios, psys->vendor, buf, 64)) != NULL) {
    130 				buf += strlen(s);
    131 				*buf++ = ' ';
    132 			}
    133 			smbios_get_string(&smbios, psys->product, buf, 64);
    134 		}
    135 	}
    136 
    137 	if (model_buf[0] == '\0')
    138 		strcpy(model_buf, "ACPI");
    139 
    140 	return model_buf;
    141 }
    142 
    143 void
    144 efi_acpi_show(void)
    145 {
    146 	struct acpi_rdsp *rsdp = acpi_root;
    147 
    148 	if (!efi_acpi_available()) {
    149 		return;
    150 	}
    151 
    152 	command_printtab("ACPI", "v%02d %c%c%c%c%c%c\n", rsdp->revision,
    153 	    rsdp->oemid[0], rsdp->oemid[1], rsdp->oemid[2],
    154 	    rsdp->oemid[3], rsdp->oemid[4], rsdp->oemid[5]);
    155 
    156 	if (smbios_table) {
    157 		command_printtab("SMBIOS", "%s\n", efi_acpi_get_model());
    158 	}
    159 }
    160