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efiacpi.c revision 1.9 
      1 /* $NetBSD: efiacpi.c,v 1.9 2021/05/21 21:53:15 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 "efifdt.h"
     35 #include "smbios.h"
     36 
     37 struct acpi_rdsp {
     38 	char signature[8];
     39 	uint8_t checksum;
     40 	char oemid[6];
     41 	uint8_t revision;
     42 	uint32_t rsdtphys;
     43 	uint32_t length;
     44 	uint64_t xsdtphys;
     45 	uint8_t extcsum;
     46 	uint8_t reserved[3];
     47 };
     48 
     49 #include <libfdt.h>
     50 
     51 #define	ACPI_FDT_SIZE	(128 * 1024)
     52 
     53 static EFI_GUID Acpi20TableGuid = ACPI_20_TABLE_GUID;
     54 static EFI_GUID Smbios3TableGuid = SMBIOS3_TABLE_GUID;
     55 
     56 static int acpi_enable = 1;
     57 static void *acpi_root = NULL;
     58 static void *smbios3_table = NULL;
     59 
     60 int
     61 efi_acpi_probe(void)
     62 {
     63 	EFI_STATUS status;
     64 
     65 	status = LibGetSystemConfigurationTable(&Acpi20TableGuid, &acpi_root);
     66 	if (EFI_ERROR(status))
     67 		return EIO;
     68 
     69 	status = LibGetSystemConfigurationTable(&Smbios3TableGuid, &smbios3_table);
     70 	if (EFI_ERROR(status))
     71 		smbios3_table = NULL;
     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 static char model_buf[128];
     95 
     96 static const char *
     97 efi_acpi_get_model(void)
     98 {
     99 	struct smbtable smbios;
    100 	struct smbios_sys *psys;
    101 	const char *s;
    102 	char *buf;
    103 
    104 	memset(model_buf, 0, sizeof(model_buf));
    105 
    106 	if (smbios3_table != NULL) {
    107 		smbios_init(smbios3_table);
    108 
    109 		buf = model_buf;
    110 		smbios.cookie = 0;
    111 		if (smbios_find_table(SMBIOS_TYPE_SYSTEM, &smbios)) {
    112 			psys = smbios.tblhdr;
    113 			if ((s = smbios_get_string(&smbios, psys->vendor, buf, 64)) != NULL) {
    114 				buf += strlen(s);
    115 				*buf++ = ' ';
    116 			}
    117 			smbios_get_string(&smbios, psys->product, buf, 64);
    118 		}
    119 	}
    120 
    121 	if (model_buf[0] == '\0')
    122 		strcpy(model_buf, "ACPI");
    123 
    124 	return model_buf;
    125 }
    126 
    127 void
    128 efi_acpi_show(void)
    129 {
    130 	struct acpi_rdsp *rsdp = acpi_root;
    131 
    132 	if (!efi_acpi_available())
    133 		return;
    134 
    135 	printf("ACPI: v%02d %c%c%c%c%c%c\n", rsdp->revision,
    136 	    rsdp->oemid[0], rsdp->oemid[1], rsdp->oemid[2],
    137 	    rsdp->oemid[3], rsdp->oemid[4], rsdp->oemid[5]);
    138 
    139 	if (smbios3_table)
    140 		printf("SMBIOS: %s\n", efi_acpi_get_model());
    141 }
    142 
    143 int
    144 efi_acpi_create_fdt(void)
    145 {
    146 	int error;
    147 	void *fdt;
    148 
    149 	if (acpi_root == NULL)
    150 		return EINVAL;
    151 
    152 	fdt = AllocatePool(ACPI_FDT_SIZE);
    153 	if (fdt == NULL)
    154 		return ENOMEM;
    155 
    156 	error = fdt_create_empty_tree(fdt, ACPI_FDT_SIZE);
    157 	if (error)
    158 		return EIO;
    159 
    160 	const char *model = efi_acpi_get_model();
    161 
    162 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/"), "compatible", "netbsd,generic-acpi");
    163 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/"), "model", model);
    164 	fdt_setprop_cell(fdt, fdt_path_offset(fdt, "/"), "#address-cells", 2);
    165 	fdt_setprop_cell(fdt, fdt_path_offset(fdt, "/"), "#size-cells", 2);
    166 
    167 	fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "chosen");
    168 	fdt_setprop_u64(fdt, fdt_path_offset(fdt, "/chosen"), "netbsd,acpi-root-table", (uint64_t)(uintptr_t)acpi_root);
    169 	if (smbios3_table)
    170 		fdt_setprop_u64(fdt, fdt_path_offset(fdt, "/chosen"), "netbsd,smbios-table", (uint64_t)(uintptr_t)smbios3_table);
    171 
    172 	fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "acpi");
    173 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/acpi"), "compatible", "netbsd,acpi");
    174 
    175 	return efi_fdt_set_data(fdt);
    176 }
    177