freebsd-dev/sys/dev/acpica/Osd/OsdTable.c

/*-
 * Copyright (c) 2002 Mitsaru Iwasaki
 * 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.
 */

/*
 * ACPI Table interfaces
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/linker.h>

#include <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/actables.h>

#undef _COMPONENT
#define	_COMPONENT      ACPI_TABLES

static char acpi_osname[128];
TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname));

ACPI_STATUS
AcpiOsPredefinedOverride(const ACPI_PREDEFINED_NAMES *InitVal,
    ACPI_STRING *NewVal)
{

    if (InitVal == NULL || NewVal == NULL)
	return (AE_BAD_PARAMETER);

    *NewVal = NULL;
    if (strncmp(InitVal->Name, "_OS_", ACPI_NAME_SIZE) == 0 &&
	strlen(acpi_osname) > 0) {
	printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname);
	*NewVal = acpi_osname;
    }

    return (AE_OK);
}

ACPI_STATUS
AcpiOsTableOverride(ACPI_TABLE_HEADER *ExistingTable,
    ACPI_TABLE_HEADER **NewTable)
{
    char modname[] = "acpi_dsdt";
    caddr_t acpi_table, p, s;

    if (ExistingTable == NULL || NewTable == NULL)
	return (AE_BAD_PARAMETER);

#ifdef notyet
    for (int i = 0; i < ACPI_NAME_SIZE; i++)
	modname[i + 5] = tolower(ExistingTable->Signature[i]);
#else
    /* If we're not overriding the DSDT, just return. */
    if (strncmp(ExistingTable->Signature, ACPI_SIG_DSDT, ACPI_NAME_SIZE) != 0) {
	*NewTable = NULL;
	return (AE_OK);
    }
#endif

    if ((acpi_table = preload_search_by_type(modname)) != NULL &&
	(p = preload_search_info(acpi_table, MODINFO_ADDR)) != NULL &&
	(s = preload_search_info(acpi_table, MODINFO_SIZE)) != NULL &&
	*(size_t *)s != 0)
	*NewTable = *(ACPI_TABLE_HEADER **)p;
    else
	*NewTable = NULL;

    return (AE_OK);
}