usr/src/boot/sys/boot/efi/loader/acpi.c

/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2016 Tooams Soome <tsoome@me.com>
 */

#include <sys/cdefs.h>

#include <stand.h>
#include <machine/stdarg.h>
#include <bootstrap.h>
#include <efi.h>
#include <efilib.h>

#include "platform/acfreebsd.h"
#include "acconfig.h"
#define ACPI_SYSTEM_XFACE
#include "actypes.h"
#include "actbl.h"

ACPI_TABLE_RSDP	*rsdp;
static EFI_GUID acpi_guid = ACPI_TABLE_GUID;
static EFI_GUID acpi20_guid = ACPI_20_TABLE_GUID;

void
acpi_detect(void)
{
    char		buf[24];
    int			revision;

    if ((rsdp = efi_get_table(&acpi20_guid)) == NULL)
	rsdp = efi_get_table(&acpi_guid);

    if (rsdp == NULL)
	return;

    /* export values from the RSDP */
#ifdef _LP64
    snprintf(buf, sizeof (buf), "0x%016llx", (unsigned long long)rsdp);
#else
    snprintf(buf, sizeof (buf), "0x%08x", (unsigned int)rsdp);
#endif
    setenv("acpi.rsdp", buf, 1);
    revision = rsdp->Revision;
    if (revision == 0)
	revision = 1;
    snprintf(buf, sizeof (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);
#ifdef _LP64
    snprintf(buf, sizeof (buf), "0x%016llx",
	(unsigned long long)rsdp->RsdtPhysicalAddress);
#else
    snprintf(buf, sizeof (buf), "0x%08x", rsdp->RsdtPhysicalAddress);
#endif
    setenv("acpi.rsdt", buf, 1);
    if (revision >= 2) {
	snprintf(buf, sizeof (buf), "0x%016llx",
	    (unsigned long long)rsdp->XsdtPhysicalAddress);
	setenv("acpi.xsdt", buf, 1);
	snprintf(buf, sizeof (buf), "%d", rsdp->Length);
	setenv("acpi.xsdt_length", buf, 1);
    }
}