sys/dev/acpica/acpi_package.c

   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, UINT64 *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     UINT64              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 }