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/8.1/sys/dev/acpica/acpi_quirk.c 193530 2009-06-05 18:44:36Z jkim $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 
   33 #include <contrib/dev/acpica/include/acpi.h>
   34 
   35 #include <dev/acpica/acpivar.h>
   36 
   37 enum ops_t {
   38         OP_NONE,
   39         OP_LEQ,
   40         OP_GEQ,
   41         OP_EQL,
   42 };
   43 
   44 enum val_t {
   45         OEM,
   46         OEM_REV,
   47         CREATOR,
   48         CREATOR_REV,
   49 };
   50 
   51 struct acpi_q_rule {
   52     char        sig[ACPI_NAME_SIZE];    /* Table signature to match */
   53     enum val_t  val;
   54     union {
   55         char    *id;
   56         enum ops_t op;
   57     } x;
   58     union {
   59         char    *tid;
   60         int     rev;
   61     } y;
   62 };
   63 
   64 struct acpi_q_entry {
   65     const struct acpi_q_rule *match;
   66     int         quirks;
   67 };
   68 
   69 #include "acpi_quirks.h"
   70 
   71 static int      aq_revcmp(int revision, enum ops_t op, int value);
   72 static int      aq_strcmp(char *actual, char *possible);
   73 static int      aq_match_header(ACPI_TABLE_HEADER *hdr,
   74                     const struct acpi_q_rule *match);
   75 
   76 static int
   77 aq_revcmp(int revision, enum ops_t op, int value)
   78 {
   79     switch (op) {
   80     case OP_LEQ:
   81         if (revision <= value)
   82             return (TRUE);
   83         break;
   84     case OP_GEQ:
   85         if (revision >= value)
   86             return (TRUE);
   87         break;
   88     case OP_EQL:
   89         if (revision == value)
   90             return (TRUE);
   91         break;
   92     case OP_NONE:
   93         return (TRUE);
   94     default:
   95         panic("aq_revcmp: invalid op %d", op);
   96     }
   97 
   98     return (FALSE);
   99 }
  100 
  101 static int
  102 aq_strcmp(char *actual, char *possible)
  103 {
  104     if (actual == NULL || possible == NULL)
  105         return (TRUE);
  106     return (strncmp(actual, possible, strlen(possible)) == 0);
  107 }
  108 
  109 static int
  110 aq_match_header(ACPI_TABLE_HEADER *hdr, const struct acpi_q_rule *match)
  111 {
  112     int result;
  113 
  114     result = FALSE;
  115     switch (match->val) {
  116     case OEM:
  117         if (aq_strcmp(hdr->OemId, match->x.id) &&
  118             aq_strcmp(hdr->OemTableId, match->y.tid))
  119             result = TRUE;
  120         break;
  121     case CREATOR:
  122         if (aq_strcmp(hdr->AslCompilerId, match->x.id))
  123             result = TRUE;
  124         break;
  125     case OEM_REV:
  126         if (aq_revcmp(hdr->OemRevision, match->x.op, match->y.rev))
  127             result = TRUE;
  128         break;
  129     case CREATOR_REV:
  130         if (aq_revcmp(hdr->AslCompilerRevision, match->x.op, match->y.rev))
  131             result = TRUE;
  132         break;
  133     }
  134 
  135     return (result);
  136 }
  137 
  138 int
  139 acpi_table_quirks(int *quirks)
  140 {
  141     const struct acpi_q_entry *entry;
  142     const struct acpi_q_rule *match;
  143     ACPI_TABLE_HEADER fadt, dsdt, xsdt, *hdr;
  144     int done;
  145 
  146     /* First, allow the machdep system to set its idea of quirks. */
  147     KASSERT(quirks != NULL, ("acpi quirks ptr is NULL"));
  148     acpi_machdep_quirks(quirks);
  149 
  150     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_FADT, 0, &fadt)))
  151         bzero(&fadt, sizeof(fadt));
  152     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_DSDT, 0, &dsdt)))
  153         bzero(&dsdt, sizeof(dsdt));
  154     if (ACPI_FAILURE(AcpiGetTableHeader(ACPI_SIG_XSDT, 0, &xsdt)))
  155         bzero(&xsdt, sizeof(xsdt));
  156 
  157     /* Then, override the quirks with any matched from table signatures. */
  158     for (entry = acpi_quirks_table; entry->match; entry++) {
  159         done = TRUE;
  160         for (match = entry->match; match->sig[0] != '\0'; match++) {
  161             if (!strncmp(match->sig, "FADT", ACPI_NAME_SIZE))
  162                 hdr = &fadt;
  163             else if (!strncmp(match->sig, ACPI_SIG_DSDT, ACPI_NAME_SIZE))
  164                 hdr = &dsdt;
  165             else if (!strncmp(match->sig, ACPI_SIG_XSDT, ACPI_NAME_SIZE))
  166                 hdr = &xsdt;
  167             else
  168                 panic("invalid quirk header\n");
  169 
  170             /* If we don't match any, skip to the next entry. */
  171             if (aq_match_header(hdr, match) == FALSE) {
  172                 done = FALSE;
  173                 break;
  174             }
  175         }
  176 
  177         /* If all entries matched, update the quirks and return. */
  178         if (done) {
  179             *quirks = entry->quirks;
  180             break;
  181         }
  182     }
  183 
  184     return (0);
  185 }

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