The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_quirk.c

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    1 /*-
    2  * Copyright (c) 2004 Nate Lawson (SDG)
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/6.2/sys/dev/acpica/acpi_quirk.c 152152 2005-11-07 09:53:25Z obrien $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 
   33 #include <contrib/dev/acpica/acpi.h>
   34 #include <dev/acpica/acpivar.h>
   35 
   36 enum ops_t {
   37         OP_NONE,
   38         OP_LEQ,
   39         OP_GEQ,
   40         OP_EQL,
   41 };
   42 
   43 enum val_t {
   44         OEM,
   45         OEM_REV,
   46         CREATOR,
   47         CREATOR_REV,
   48 };
   49 
   50 #define ACPI_TABLE_END          (ACPI_TABLE_MAX + 1)
   51 
   52 struct acpi_q_rule {
   53     int         sig;            /* Table signature to match */
   54     enum val_t  val;
   55     union {
   56         char    *id;
   57         enum ops_t op;
   58     } x;
   59     union {
   60         char    *tid;
   61         int     rev;
   62     } y;
   63 };
   64 
   65 struct acpi_q_entry {
   66     const struct acpi_q_rule *match;
   67     int         quirks;
   68 };
   69 
   70 #include "acpi_quirks.h"
   71 
   72 static int      aq_revcmp(int revision, enum ops_t op, int value);
   73 static int      aq_strcmp(char *actual, char *possible);
   74 static int      aq_match_header(ACPI_TABLE_HEADER *hdr,
   75                     const struct acpi_q_rule *match);
   76 
   77 static int
   78 aq_revcmp(int revision, enum ops_t op, int value)
   79 {
   80     switch (op) {
   81     case OP_LEQ:
   82         if (revision <= value)
   83             return (TRUE);
   84         break;
   85     case OP_GEQ:
   86         if (revision >= value)
   87             return (TRUE);
   88         break;
   89     case OP_EQL:
   90         if (revision == value)
   91             return (TRUE);
   92         break;
   93     case OP_NONE:
   94         return (TRUE);
   95     default:
   96         panic("aq_revcmp: invalid op %d", op);
   97     }
   98 
   99     return (FALSE);
  100 }
  101 
  102 static int
  103 aq_strcmp(char *actual, char *possible)
  104 {
  105     if (actual == NULL || possible == NULL)
  106         return (TRUE);
  107     return (strncmp(actual, possible, strlen(possible)) == 0);
  108 }
  109 
  110 static int
  111 aq_match_header(ACPI_TABLE_HEADER *hdr, const struct acpi_q_rule *match)
  112 {
  113     int result;
  114 
  115     result = FALSE;
  116     switch (match->val) {
  117     case OEM:
  118         if (aq_strcmp(hdr->OemId, match->x.id) &&
  119             aq_strcmp(hdr->OemTableId, match->y.tid))
  120             result = TRUE;
  121         break;
  122     case CREATOR:
  123         if (aq_strcmp(hdr->AslCompilerId, match->x.id))
  124             result = TRUE;
  125         break;
  126     case OEM_REV:
  127         if (aq_revcmp(hdr->OemRevision, match->x.op, match->y.rev))
  128             result = TRUE;
  129         break;
  130     case CREATOR_REV:
  131         if (aq_revcmp(hdr->AslCompilerRevision, match->x.op, match->y.rev))
  132             result = TRUE;
  133         break;
  134     }
  135 
  136     return (result);
  137 }
  138 
  139 int
  140 acpi_table_quirks(int *quirks)
  141 {
  142     const struct acpi_q_entry *entry;
  143     const struct acpi_q_rule *match;
  144     ACPI_TABLE_HEADER *hdr;
  145     int done;
  146 
  147     /* First, allow the machdep system to set its idea of quirks. */
  148     KASSERT(quirks != NULL, ("acpi quirks ptr is NULL"));
  149     acpi_machdep_quirks(quirks);
  150 
  151     /* Then, override the quirks with any matched from table signatures. */
  152     for (entry = acpi_quirks_table; entry->match; entry++) {
  153         done = TRUE;
  154         for (match = entry->match; match->sig != ACPI_TABLE_END; match++) {
  155             switch (match->sig) {
  156             case ACPI_TABLE_FADT:
  157                 hdr = (ACPI_TABLE_HEADER *)AcpiGbl_FADT;
  158                 break;
  159             case ACPI_TABLE_DSDT:
  160                 hdr = (ACPI_TABLE_HEADER *)AcpiGbl_DSDT;
  161                 break;
  162             case ACPI_TABLE_XSDT:
  163                 hdr = (ACPI_TABLE_HEADER *)AcpiGbl_XSDT;
  164                 break;
  165             default:
  166                 panic("invalid quirk header\n");
  167             }
  168 
  169             /* If we don't match any, skip to the next entry. */
  170             if (!aq_match_header(hdr, match)) {
  171                 done = FALSE;
  172                 break;
  173             }
  174         }
  175 
  176         /* If all entries matched, update the quirks and return. */
  177         if (done) {
  178             *quirks = entry->quirks;
  179             break;
  180         }
  181     }
  182 
  183     return (0);
  184 }

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