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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/stand/efi/acpica/acpi_detect.c
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/*-

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 * Copyright (c) 2014 Ed Maste <[email protected]>

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 * Copyright (c) 2025 Kayla Powell <[email protected]>

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#include <machine/_inttypes.h>

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#include <efi.h>

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#include <Guid/Acpi.h>

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#include <acpi.h>

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#include "acpi_detect.h"

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/* For ACPI rsdp discovery. */

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EFI_GUID acpi = ACPI_TABLE_GUID;

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EFI_GUID acpi20 = EFI_ACPI_TABLE_GUID;

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ACPI_TABLE_RSDP *rsdp;

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void

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acpi_detect(void)

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{

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	char buf[24];

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	int revision;

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	feature_enable(FEATURE_EARLY_ACPI);

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	if ((rsdp = efi_get_table(&acpi20)) == NULL)

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		if ((rsdp = efi_get_table(&acpi)) == NULL)

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			return;

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	sprintf(buf, "0x%016"PRIxPTR, (uintptr_t)rsdp);

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	setenv("acpi.rsdp", buf, 1);

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	revision = rsdp->Revision;

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	if (revision == 0)

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		revision = 1;

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	sprintf(buf, "%d", revision);

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	setenv("acpi.revision", buf, 1);

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	strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));

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	buf[sizeof(rsdp->OemId)] = '\0';

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	setenv("acpi.oem", buf, 1);

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	sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress);

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	setenv("acpi.rsdt", buf, 1);

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	if (revision >= 2) {

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		/* XXX extended checksum? */

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		sprintf(buf, "0x%016llx",

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		    (unsigned long long)rsdp->XsdtPhysicalAddress);

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		setenv("acpi.xsdt", buf, 1);

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		sprintf(buf, "%d", rsdp->Length);

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		setenv("acpi.xsdt_length", buf, 1);

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	}

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}

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