diff options
Diffstat (limited to 'stand/efi/acpica/acpi_detect.c')
| -rw-r--r-- | stand/efi/acpica/acpi_detect.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/stand/efi/acpica/acpi_detect.c b/stand/efi/acpica/acpi_detect.c new file mode 100644 index 000000000000..1f15a882ff9d --- /dev/null +++ b/stand/efi/acpica/acpi_detect.c @@ -0,0 +1,69 @@ +/*- + * Copyright (c) 2014 Ed Maste <emaste@freebsd.org> + * Copyright (c) 2025 Kayla Powell <kpowkitty@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <machine/_inttypes.h> +#include <efi.h> +#include <acpi.h> +#include "acpi_detect.h" + +/* For ACPI rsdp discovery. */ +EFI_GUID acpi = ACPI_TABLE_GUID; +EFI_GUID acpi20 = ACPI_20_TABLE_GUID; +ACPI_TABLE_RSDP *rsdp; + +void +acpi_detect(void) +{ + char buf[24]; + int revision; + + feature_enable(FEATURE_EARLY_ACPI); + if ((rsdp = efi_get_table(&acpi20)) == NULL) + if ((rsdp = efi_get_table(&acpi)) == NULL) + return; + + sprintf(buf, "0x%016"PRIxPTR, (uintptr_t)rsdp); + setenv("acpi.rsdp", buf, 1); + revision = rsdp->Revision; + if (revision == 0) + revision = 1; + sprintf(buf, "%d", revision); + setenv("acpi.revision", buf, 1); + strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId)); + buf[sizeof(rsdp->OemId)] = '\0'; + setenv("acpi.oem", buf, 1); + sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress); + setenv("acpi.rsdt", buf, 1); + if (revision >= 2) { + /* XXX extended checksum? */ + sprintf(buf, "0x%016llx", + (unsigned long long)rsdp->XsdtPhysicalAddress); + setenv("acpi.xsdt", buf, 1); + sprintf(buf, "%d", rsdp->Length); + setenv("acpi.xsdt_length", buf, 1); + } +} |