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
acpislit_exist(void)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
acpislit_init(void)66 acpislit_init(void)
67 {
68 if (!acpislit_exist())
69 return EEXIST;
70 return 0;
71 }
72
73 void
acpislit_dump(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
acpislit_cpus(void)93 acpislit_cpus(void)
94 {
95 return slit->LocalityCount;
96 }
97
98 uint32_t
acpislit_distance(uint32_t cpu1,uint32_t cpu2)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