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
acpi_detect(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