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@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
efi_acpi_probe(void)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
efi_acpi_available(void)78 efi_acpi_available(void)
79 {
80 return acpi_root != NULL && acpi_enabled;
81 }
82
83 int
efi_acpi_enabled(void)84 efi_acpi_enabled(void)
85 {
86 return acpi_enabled;
87 }
88
89 void *
efi_acpi_root(void)90 efi_acpi_root(void)
91 {
92 return acpi_root;
93 }
94
95 void *
efi_acpi_smbios(void)96 efi_acpi_smbios(void)
97 {
98 return smbios_table;
99 }
100
101 static char model_buf[128];
102
103 void
efi_acpi_enable(int val)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 *
efi_acpi_get_model(void)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
efi_acpi_show(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