sys/dev/acpi/acpi_slit.c

   1 /* $NetBSD$ */
   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, "$NetBSD$");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37
  38 #include <dev/acpi/acpica.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 }