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efiacpi.c revision 1.5 
      1 /* $NetBSD: efiacpi.c,v 1.5 2019/11/30 13:02:18 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 #include <libfdt.h>
     38 
     39 #define	ACPI_FDT_SIZE	(128 * 1024)
     40 
     41 static EFI_GUID Acpi20TableGuid = ACPI_20_TABLE_GUID;
     42 static EFI_GUID Smbios3TableGuid = SMBIOS3_TABLE_GUID;
     43 
     44 static void *acpi_root = NULL;
     45 static void *smbios3_table = NULL;
     46 
     47 int
     48 efi_acpi_probe(void)
     49 {
     50 	EFI_STATUS status;
     51 
     52 	status = LibGetSystemConfigurationTable(&Acpi20TableGuid, &acpi_root);
     53 	if (EFI_ERROR(status))
     54 		return EIO;
     55 
     56 	status = LibGetSystemConfigurationTable(&Smbios3TableGuid, &smbios3_table);
     57 	if (EFI_ERROR(status))
     58 		smbios3_table = NULL;
     59 
     60 	return 0;
     61 }
     62 
     63 int
     64 efi_acpi_available(void)
     65 {
     66 	return acpi_root != NULL;
     67 }
     68 
     69 void
     70 efi_acpi_show(void)
     71 {
     72 	if (!efi_acpi_available())
     73 		return;
     74 
     75 	printf("ACPI: RSDP %p", acpi_root);
     76 	if (smbios3_table)
     77 		printf(", SMBIOS %p", smbios3_table);
     78 	printf("\n");
     79 }
     80 
     81 static char model_buf[128];
     82 
     83 static const char *
     84 efi_acpi_get_model(void)
     85 {
     86 	struct smbtable smbios;
     87 	struct smbios_sys *psys;
     88 	const char *s;
     89 	char *buf;
     90 
     91 	memset(model_buf, 0, sizeof(model_buf));
     92 
     93 	if (smbios3_table != NULL) {
     94 		smbios_init(smbios3_table);
     95 
     96 		buf = model_buf;
     97 		smbios.cookie = 0;
     98 		if (smbios_find_table(SMBIOS_TYPE_SYSTEM, &smbios)) {
     99 			psys = smbios.tblhdr;
    100 			if ((s = smbios_get_string(&smbios, psys->vendor, buf, 64)) != NULL) {
    101 				buf += strlen(s);
    102 				*buf++ = ' ';
    103 			}
    104 			smbios_get_string(&smbios, psys->product, buf, 64);
    105 		}
    106 	}
    107 
    108 	if (model_buf[0] == '\0')
    109 		strcpy(model_buf, "ACPI");
    110 
    111 	return model_buf;
    112 }
    113 
    114 int
    115 efi_acpi_create_fdt(void)
    116 {
    117 	int error;
    118 	void *fdt;
    119 
    120 	if (acpi_root == NULL)
    121 		return EINVAL;
    122 
    123 	fdt = AllocatePool(ACPI_FDT_SIZE);
    124 	if (fdt == NULL)
    125 		return ENOMEM;
    126 
    127 	error = fdt_create_empty_tree(fdt, ACPI_FDT_SIZE);
    128 	if (error)
    129 		return EIO;
    130 
    131 	const char *model = efi_acpi_get_model();
    132 
    133 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/"), "compatible", "netbsd,generic-acpi");
    134 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/"), "model", model);
    135 	fdt_setprop_cell(fdt, fdt_path_offset(fdt, "/"), "#address-cells", 2);
    136 	fdt_setprop_cell(fdt, fdt_path_offset(fdt, "/"), "#size-cells", 2);
    137 
    138 	fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "chosen");
    139 	fdt_setprop_u64(fdt, fdt_path_offset(fdt, "/chosen"), "netbsd,acpi-root-table", (uint64_t)(uintptr_t)acpi_root);
    140 	if (smbios3_table)
    141 		fdt_setprop_u64(fdt, fdt_path_offset(fdt, "/chosen"), "netbsd,smbios-table", (uint64_t)(uintptr_t)smbios3_table);
    142 #ifdef EFIBOOT_RUNTIME_ADDRESS
    143 	fdt_setprop_u64(fdt, fdt_path_offset(fdt, "/chosen"), "netbsd,uefi-system-table", (uint64_t)(uintptr_t)ST);
    144 #endif
    145 
    146 	fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), "acpi");
    147 	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/acpi"), "compatible", "netbsd,acpi");
    148 
    149 	return efi_fdt_set_data(fdt);
    150 }
    151