/* $NetBSD: acpi_slit.c,v 1.3 2010/03/05 14:00:17 jruoho Exp $ */

/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christoph Egger.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_slit.c,v 1.3 2010/03/05 14:00:17 jruoho Exp $");

#include <sys/param.h>
#include <sys/systm.h>

#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpi_slit.h>

static ACPI_TABLE_SLIT *slit;

bool
acpislit_exist(void)
{
       ACPI_TABLE_HEADER *table;
       ACPI_STATUS rv;

       rv = AcpiGetTable(ACPI_SIG_SLIT, 1, (ACPI_TABLE_HEADER **)&table);
       if (ACPI_FAILURE(rv))
               return false;

       /* Check if header is valid */
       if (table == NULL)
               return false;

       if (table->Length == 0xffffffff)
               return false;

       slit = (ACPI_TABLE_SLIT *)table;

       return true;
}

int
acpislit_init(void)
{
       if (!acpislit_exist())
               return EEXIST;
       return 0;
}

void
acpislit_dump(void)
{
       uint64_t idx, count;

       count = acpislit_cpus();

       aprint_debug("SLIT: matrix with %"PRIu64" nodes\n", count);
       aprint_debug("SLIT: ");
       for (idx = 0; idx < (count * count); idx++) {
               aprint_debug("%u ", slit->Entry[idx]);
               if ((idx % count) == (count - 1)) {
                       aprint_debug("\n");
                       if (idx < (count * count) - 1)
                               aprint_debug("SLIT: ");
               }
       }
}

uint32_t
acpislit_cpus(void)
{
       return slit->LocalityCount;
}

uint32_t
acpislit_distance(uint32_t cpu1, uint32_t cpu2)
{
       uint64_t idx = cpu1 * slit->LocalityCount + cpu2;
       return slit->Entry[idx];
}