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("$FreeBSD$");
   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 struct acpi_q_rule {
   51     char        sig[ACPI_NAME_SIZE];    /* Table signature to match */
   52     enum val_t  val;
   53     union {
   54         char    *id;
   55         enum ops_t op;
   56     } x;
   57     union {
   58         char    *tid;
   59         int     rev;
   60     } y;
   61 };
   62 
   63 struct acpi_q_entry {
   64     const struct acpi_q_rule *match;
   65     int         quirks;
   66 };
   67 
   68 #include "acpi_quirks.h"
   69 
   70 static int      aq_revcmp(int revision, enum ops_t op, int value);
   71 static int      aq_strcmp(char *actual, char *possible);
   72 static int      aq_match_header(ACPI_TABLE_HEADER *hdr,
   73                     const struct acpi_q_rule *match);
   74 
   75 static int
   76 aq_revcmp(int revision, enum ops_t op, int value)
   77 {
   78     switch (op) {
   79     case OP_LEQ:
   80         if (revision <= value)
   81             return (TRUE);
   82         break;
   83     case OP_GEQ:
   84         if (revision >= value)
   85             return (TRUE);
   86         break;
   87     case OP_EQL:
   88         if (revision == value)
   89             return (TRUE);
   90         break;
   91     case OP_NONE:
   92         return (TRUE);
   93     default:
   94         panic("aq_revcmp: invalid op %d", op);
   95     }
   96 
   97     return (FALSE);
   98 }
   99 
  100 static int
  101 aq_strcmp(char *actual, char *possible)
  102 {
  103     if (actual == NULL || possible == NULL)
  104         return (TRUE);
  105     return (strncmp(actual, possible, strlen(possible)) == 0);
  106 }
  107 
  108 static int
  109 aq_match_header(ACPI_TABLE_HEADER *hdr, const struct acpi_q_rule *match)
  110 {
  111     int result;
  112 
  113     result = FALSE;
  114     switch (match->val) {
  115     case OEM:
  116         if (aq_strcmp(hdr->OemId, match->x.id) &&
  117             aq_strcmp(hdr->OemTableId, match->y.tid))
  118             result = TRUE;
  119         break;
  120     case CREATOR:
  121         if (aq_strcmp(hdr->AslCompilerId, match->x.id))
  122             result = TRUE;
  123         break;
  124     case OEM_REV:
  125         if (aq_revcmp(hdr->OemRevision, match->x.op, match->y.rev))
  126             result = TRUE;
  127         break;
  128     case CREATOR_REV:
  129         if (aq_revcmp(hdr->AslCompilerRevision, match->x.op, match->y.rev))
  130             result = TRUE;
  131         break;
  132     }
  133 
  134     return (result);
  135 }
  136 
  137 int
  138 acpi_table_quirks(int *quirks)
  139 {
  140     const struct acpi_q_entry *entry;
  141     const struct acpi_q_rule *match;
  142     ACPI_TABLE_HEADER fadt, dsdt, xsdt, *hdr;
  143     int done;
  144 
  145     /* First, allow the machdep system to set its idea of quirks. */
  146     KASSERT(quirks != NULL, ("acpi quirks ptr is NULL"));
  147     acpi_machdep_quirks(quirks);
  148 
  149     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_FADT, 0, &fadt)))
  150         bzero(&fadt, sizeof(fadt));
  151     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_DSDT, 0, &dsdt)))
  152         bzero(&dsdt, sizeof(dsdt));
  153     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_XSDT, 0, &xsdt)))
  154         bzero(&xsdt, sizeof(xsdt));
  155 
  156     /* Then, override the quirks with any matched from table signatures. */
  157     for (entry = acpi_quirks_table; entry->match; entry++) {
  158         done = TRUE;
  159         for (match = entry->match; match->sig[0] != '\0'; match++) {
  160             if (!strncmp(match->sig, "FADT", ACPI_NAME_SIZE))
  161                 hdr = &fadt;
  162             else if (!strncmp(match->sig, ACPI_SIG_DSDT, ACPI_NAME_SIZE))
  163                 hdr = &dsdt;
  164             else if (!strncmp(match->sig, ACPI_SIG_XSDT, ACPI_NAME_SIZE))
  165                 hdr = &xsdt;
  166             else
  167                 panic("invalid quirk header\n");
  168 
  169             /* If we don't match any, skip to the next entry. */
  170             if (aq_match_header(hdr, match) == FALSE) {
  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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