1 /*- 2 * Copyright (c) 2014 Ed Maste <emaste@freebsd.org> 3 * Copyright (c) 2025 Kayla Powell <kpowkitty@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <machine/_inttypes.h> 29 #include <efi.h> 30 #include <acpi.h> 31 #include "acpi_detect.h" 32 33 /* For ACPI rsdp discovery. */ 34 EFI_GUID acpi = ACPI_TABLE_GUID; 35 EFI_GUID acpi20 = ACPI_20_TABLE_GUID; 36 ACPI_TABLE_RSDP *rsdp; 37 38 void 39 acpi_detect(void) 40 { 41 char buf[24]; 42 int revision; 43 44 feature_enable(FEATURE_EARLY_ACPI); 45 if ((rsdp = efi_get_table(&acpi20)) == NULL) 46 if ((rsdp = efi_get_table(&acpi)) == NULL) 47 return; 48 49 sprintf(buf, "0x%016"PRIxPTR, (uintptr_t)rsdp); 50 setenv("acpi.rsdp", buf, 1); 51 revision = rsdp->Revision; 52 if (revision == 0) 53 revision = 1; 54 sprintf(buf, "%d", revision); 55 setenv("acpi.revision", buf, 1); 56 strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId)); 57 buf[sizeof(rsdp->OemId)] = '\0'; 58 setenv("acpi.oem", buf, 1); 59 sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress); 60 setenv("acpi.rsdt", buf, 1); 61 if (revision >= 2) { 62 /* XXX extended checksum? */ 63 sprintf(buf, "0x%016llx", 64 (unsigned long long)rsdp->XsdtPhysicalAddress); 65 setenv("acpi.xsdt", buf, 1); 66 sprintf(buf, "%d", rsdp->Length); 67 setenv("acpi.xsdt_length", buf, 1); 68 } 69 } 70