1/* $NetBSD: acpi_slit.c,v 1.2 2009/12/04 10:42:39 njoly 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 1.2 2009/12/04 10:42:39 njoly 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
41static ACPI_TABLE_SLIT *slit;
42
43bool
44acpislit_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
65int
66acpislit_init(void)
67{
68	if (!acpislit_exist())
69		return EEXIST;
70	return 0;
71}
72
73void
74acpislit_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
92uint32_t
93acpislit_cpus(void)
94{
95	return slit->LocalityCount;
96}
97
98uint32_t
99acpislit_distance(uint32_t cpu1, uint32_t cpu2)
100{
101	uint64_t idx = cpu1 * slit->LocalityCount + cpu2;
102	return slit->Entry[idx];
103}
104