FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_package.c

     /*-
      * Copyright (c) 2003 Nate Lawson
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/dev/acpica/acpi_package.c,v 1.9.8.1 2009/04/15 03:14:26 kensmith Exp $
     */
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/sbuf.h>
    
    #include <sys/rman.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    
    /*
     * Package manipulation convenience functions
     */
    
    int
    acpi_PkgInt(ACPI_OBJECT *res, int idx, ACPI_INTEGER *dst)
    {
        ACPI_OBJECT         *obj;
    
        obj = &res->Package.Elements[idx];
        if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER)
            return (EINVAL);
        *dst = obj->Integer.Value;
    
        return (0);
    }
    
    int
    acpi_PkgInt32(ACPI_OBJECT *res, int idx, uint32_t *dst)
    {
        ACPI_INTEGER        tmp;
        int                 error;
    
        error = acpi_PkgInt(res, idx, &tmp);
        if (error == 0)
            *dst = (uint32_t)tmp;
    
        return (error);
    }
    
    int
    acpi_PkgStr(ACPI_OBJECT *res, int idx, void *dst, size_t size)
    {
        ACPI_OBJECT         *obj;
        void                *ptr;
        size_t               length;
    
        obj = &res->Package.Elements[idx];
        if (obj == NULL)
            return (EINVAL);
        bzero(dst, size);
    
        switch (obj->Type) {
        case ACPI_TYPE_STRING:
            ptr = obj->String.Pointer;
            length = obj->String.Length;
            break;
        case ACPI_TYPE_BUFFER:
            ptr = obj->Buffer.Pointer;
            length = obj->Buffer.Length;
            break;
        default:
            return (EINVAL);
        }
    
        /* Make sure string will fit, including terminating NUL */
        if (++length > size)
            return (E2BIG);
    
        strlcpy(dst, ptr, length);
        return (0);
   }
   
   int
   acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type, int *rid,
       struct resource **dst, u_int flags)
   {
       ACPI_GENERIC_ADDRESS gas;
       ACPI_OBJECT *obj;
   
       obj = &res->Package.Elements[idx];
       if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
           obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
           return (EINVAL);
   
       memcpy(&gas, obj->Buffer.Pointer + 3, sizeof(gas));
   
       return (acpi_bus_alloc_gas(dev, type, rid, &gas, dst, flags));
   }
   
   int
   acpi_PkgRawGas(ACPI_OBJECT *res, int idx, ACPI_GENERIC_ADDRESS *gas)
   {
       ACPI_OBJECT         *obj;
       obj = &res->Package.Elements[idx];
       if (obj == NULL || obj->Type != ACPI_TYPE_BUFFER ||
           obj->Buffer.Length < sizeof(ACPI_GENERIC_ADDRESS) + 3)
           return (EINVAL);
       memcpy(gas, obj->Buffer.Pointer + 3, sizeof(*gas));
       return (0);
   }
   
   ACPI_HANDLE
   acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj)
   {
       ACPI_HANDLE h;
   
       if (obj == NULL)
           return (NULL);
   
       switch (obj->Type) {
       case ACPI_TYPE_LOCAL_REFERENCE:
       case ACPI_TYPE_ANY:
           h = obj->Reference.Handle;
           break;
       case ACPI_TYPE_STRING:
           /*
            * The String object usually contains a fully-qualified path, so
            * scope can be NULL.
            *
            * XXX This may not always be the case.
            */
           if (ACPI_FAILURE(AcpiGetHandle(scope, obj->String.Pointer, &h)))
               h = NULL;
           break;
       default:
           h = NULL;
           break;
       }
   
       return (h);
   }

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