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      1 /* $NetBSD: acpi_slit.c,v 1.3 2010/03/05 14:00:17 jruoho Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christoph Egger.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: acpi_slit.c,v 1.3 2010/03/05 14:00:17 jruoho Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 
     38 #include <dev/acpi/acpivar.h>
     39 #include <dev/acpi/acpi_slit.h>
     40 
     41 static ACPI_TABLE_SLIT *slit;
     42 
     43 bool
     44 acpislit_exist(void)
     45 {
     46 	ACPI_TABLE_HEADER *table;
     47 	ACPI_STATUS rv;
     48 
     49 	rv = AcpiGetTable(ACPI_SIG_SLIT, 1, (ACPI_TABLE_HEADER **)&table);
     50 	if (ACPI_FAILURE(rv))
     51 		return false;
     52 
     53 	/* Check if header is valid */
     54 	if (table == NULL)
     55 		return false;
     56 
     57 	if (table->Length == 0xffffffff)
     58 		return false;
     59 
     60 	slit = (ACPI_TABLE_SLIT *)table;
     61 
     62 	return true;
     63 }
     64 
     65 int
     66 acpislit_init(void)
     67 {
     68 	if (!acpislit_exist())
     69 		return EEXIST;
     70 	return 0;
     71 }
     72 
     73 void
     74 acpislit_dump(void)
     75 {
     76 	uint64_t idx, count;
     77 
     78 	count = acpislit_cpus();
     79 
     80 	aprint_debug("SLIT: matrix with %"PRIu64" nodes\n", count);
     81 	aprint_debug("SLIT: ");
     82 	for (idx = 0; idx < (count * count); idx++) {
     83 		aprint_debug("%u ", slit->Entry[idx]);
     84 		if ((idx % count) == (count - 1)) {
     85 			aprint_debug("\n");
     86 			if (idx < (count * count) - 1)
     87 				aprint_debug("SLIT: ");
     88 		}
     89 	}
     90 }
     91 
     92 uint32_t
     93 acpislit_cpus(void)
     94 {
     95 	return slit->LocalityCount;
     96 }
     97 
     98 uint32_t
     99 acpislit_distance(uint32_t cpu1, uint32_t cpu2)
    100 {
    101 	uint64_t idx = cpu1 * slit->LocalityCount + cpu2;
    102 	return slit->Entry[idx];
    103 }
    104