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_package.c

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    1 /*-
    2  * Copyright (c) 2003 Nate Lawson
    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  * $FreeBSD: src/sys/dev/acpica/acpi_package.c,v 1.9.8.1 2009/04/15 03:14:26 kensmith Exp $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/kernel.h>
   31 #include <sys/bus.h>
   32 #include <sys/sbuf.h>
   33 
   34 #include <sys/rman.h>
   35 
   36 #include "acpi.h"
   37 #include <dev/acpica/acpivar.h>
   38 
   39 /*
   40  * Package manipulation convenience functions
   41  */
   42 
   43 int
   44 acpi_PkgInt(ACPI_OBJECT *res, int idx, ACPI_INTEGER *dst)
   45 {
   46     ACPI_OBJECT         *obj;
   47 
   48     obj = &res->Package.Elements[idx];
   49     if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER)
   50         return (EINVAL);
   51     *dst = obj->Integer.Value;
   52 
   53     return (0);
   54 }
   55 
   56 int
   57 acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst)
   58 {
   59     ACPI_INTEGER        tmp;
   60     int                 error;
   61 
   62     error = acpi_PkgInt(res, idx, &tmp);
   63     if (error == 0)
   64         *dst = (uint32_t)tmp;
   65 
   66     return (error);
   67 }
   68 
   69 int
   70 acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size)
   71 {
   72     ACPI_OBJECT         *obj;
   73     void                *ptr;
   74     size_t               length;
   75 
   76     obj = &res->Package.Elements[idx];
   77     if (obj == NULL)
   78         return (EINVAL);
   79     bzero(dst, size);
   80 
   81     switch (obj->Type) {
   82     case ACPI_TYPE_STRING:
   83         ptr = obj->String.Pointer;
   84         length = obj->String.Length;
   85         break;
   86     case ACPI_TYPE_BUFFER:
   87         ptr = obj->Buffer.Pointer;
   88         length = obj->Buffer.Length;
   89         break;
   90     default:
   91         return (EINVAL);
   92     }
   93 
   94     /* Make sure string will fit, including terminating NUL */
   95     if (++length > size)
   96         return (E2BIG);
   97 
   98     strlcpy(dst, ptr, length);
   99     return (0);
  100 }
  101 
  102 int
  103 acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type, int *rid,
  104     struct resource **dst, u_int flags)
  105 {
  106     ACPI_GENERIC_ADDRESS gas;
  107     ACPI_OBJECT *obj;
  108 
  109     obj = &res->Package.Elements[idx];
  110     if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
  111         obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
  112         return (EINVAL);
  113 
  114     memcpy(&gas, obj->Buffer.Pointer + 3, sizeof(gas));
  115 
  116     return (acpi_bus_alloc_gas(dev, type, rid, &gas, dst, flags));
  117 }
  118 
  119 int
  120 acpi_PkgRawGas(ACPI_OBJECT *res, int idx, ACPI_GENERIC_ADDRESS *gas)
  121 {
  122     ACPI_OBJECT         *obj;
  123     obj = &res->Package.Elements[idx];
  124     if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
  125         obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
  126         return (EINVAL);
  127     memcpy(gas, obj->Buffer.Pointer + 3, sizeof(*gas));
  128     return (0);
  129 }
  130 
  131 ACPI_HANDLE
  132 acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj)
  133 {
  134     ACPI_HANDLE h;
  135 
  136     if (obj == NULL)
  137         return (NULL);
  138 
  139     switch (obj->Type) {
  140     case ACPI_TYPE_LOCAL_REFERENCE:
  141     case ACPI_TYPE_ANY:
  142         h = obj->Reference.Handle;
  143         break;
  144     case ACPI_TYPE_STRING:
  145         /*
  146          * The String object usually contains a fully-qualified path, so
  147          * scope can be NULL.
  148          *
  149          * XXX This may not always be the case.
  150          */
  151         if (ACPI_FAILURE(AcpiGetHandle(scope, obj->String.Pointer, &h)))
  152             h = NULL;
  153         break;
  154     default:
  155         h = NULL;
  156         break;
  157     }
  158 
  159     return (h);
  160 }

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