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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/12/sys/dev/acpica/acpi_package.c 313817 2017-02-16 20:27:22Z vangyzen $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/bus.h>
   33 #include <sys/sbuf.h>
   34 
   35 #include <machine/bus.h>
   36 #include <machine/resource.h>
   37 #include <sys/rman.h>
   38 
   39 #include <contrib/dev/acpica/include/acpi.h>
   40 
   41 #include <dev/acpica/acpivar.h>
   42 
   43 /*
   44  * Package manipulation convenience functions
   45  */
   46 
   47 int
   48 acpi_PkgInt(ACPI_OBJECT *res, int idx, UINT64 *dst)
   49 {
   50     ACPI_OBJECT         *obj;
   51 
   52     obj = &res->Package.Elements[idx];
   53     if (obj->Type != ACPI_TYPE_INTEGER)
   54         return (EINVAL);
   55     *dst = obj->Integer.Value;
   56 
   57     return (0);
   58 }
   59 
   60 int
   61 acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst)
   62 {
   63     UINT64              tmp;
   64     int                 error;
   65 
   66     error = acpi_PkgInt(res, idx, &tmp);
   67     if (error == 0)
   68         *dst = (uint32_t)tmp;
   69 
   70     return (error);
   71 }
   72 
   73 int
   74 acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size)
   75 {
   76     ACPI_OBJECT         *obj;
   77     void                *ptr;
   78     size_t               length;
   79 
   80     obj = &res->Package.Elements[idx];
   81     if (obj == NULL)
   82         return (EINVAL);
   83 
   84     switch (obj->Type) {
   85     case ACPI_TYPE_STRING:
   86         ptr = obj->String.Pointer;
   87         length = obj->String.Length;
   88         break;
   89     case ACPI_TYPE_BUFFER:
   90         ptr = obj->Buffer.Pointer;
   91         length = obj->Buffer.Length;
   92         break;
   93     default:
   94         return (EINVAL);
   95     }
   96 
   97     /* Make sure string will fit, including terminating NUL */
   98     if (++length > size)
   99         return (E2BIG);
  100 
  101     strlcpy(dst, ptr, length);
  102     return (0);
  103 }
  104 
  105 int
  106 acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type, int *rid,
  107     struct resource **dst, u_int flags)
  108 {
  109     ACPI_GENERIC_ADDRESS gas;
  110     ACPI_OBJECT *obj;
  111 
  112     obj = &res->Package.Elements[idx];
  113     if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
  114         obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
  115         return (EINVAL);
  116 
  117     memcpy(&gas, obj->Buffer.Pointer + 3, sizeof(gas));
  118 
  119     return (acpi_bus_alloc_gas(dev, type, rid, &gas, dst, flags));
  120 }
  121 
  122 int
  123 acpi_PkgFFH_IntelCpu(ACPI_OBJECT *res, int idx, int *vendor, int *class,
  124     uint64_t *address, int *accsize)
  125 {
  126     ACPI_GENERIC_ADDRESS gas;
  127     ACPI_OBJECT *obj;
  128 
  129     obj = &res->Package.Elements[idx];
  130     if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
  131         obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
  132         return (EINVAL);
  133 
  134     memcpy(&gas, obj->Buffer.Pointer + 3, sizeof(gas));
  135     if (gas.SpaceId != ACPI_ADR_SPACE_FIXED_HARDWARE)
  136         return (ERESTART);
  137     *vendor = gas.BitWidth;
  138     *class = gas.BitOffset;
  139     *address = gas.Address;
  140     *accsize = gas.AccessWidth;
  141     return (0);
  142 }
  143 
  144 ACPI_HANDLE
  145 acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj)
  146 {
  147     ACPI_HANDLE h;
  148 
  149     if (obj == NULL)
  150         return (NULL);
  151 
  152     switch (obj->Type) {
  153     case ACPI_TYPE_LOCAL_REFERENCE:
  154     case ACPI_TYPE_ANY:
  155         h = obj->Reference.Handle;
  156         break;
  157     case ACPI_TYPE_STRING:
  158         /*
  159          * The String object usually contains a fully-qualified path, so
  160          * scope can be NULL.
  161          *
  162          * XXX This may not always be the case.
  163          */
  164         if (ACPI_FAILURE(AcpiGetHandle(scope, obj->String.Pointer, &h)))
  165             h = NULL;
  166         break;
  167     default:
  168         h = NULL;
  169         break;
  170     }
  171 
  172     return (h);
  173 }

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