dmrestag.c

acpi tools for linux include acpiexec and acpixtract

    {( 5 * 8) + 4,  ACPI_RESTAG_TYPE},
    {( 5 * 8) + 5,  ACPI_RESTAG_TRANSTYPE},
    {0,             NULL}
};


/* Dispatch table used to obtain the correct tag table for a descriptor */

static ACPI_RESOURCE_TAG        *AcpiGbl_ResourceTags [] =
{
    /* Small descriptors */

    NULL,                           /* 0x00, Reserved */
    NULL,                           /* 0x01, Reserved */
    NULL,                           /* 0x02, Reserved */
    NULL,                           /* 0x03, Reserved */
    AcpiDmIrqTags,                  /* 0x04, ACPI_RESOURCE_NAME_IRQ_FORMAT */
    AcpiDmDmaTags,                  /* 0x05, ACPI_RESOURCE_NAME_DMA_FORMAT */
    NULL,                           /* 0x06, ACPI_RESOURCE_NAME_START_DEPENDENT */
    NULL,                           /* 0x07, ACPI_RESOURCE_NAME_END_DEPENDENT */
    AcpiDmIoTags,                   /* 0x08, ACPI_RESOURCE_NAME_IO_PORT */
    AcpiDmFixedIoTags,              /* 0x09, ACPI_RESOURCE_NAME_FIXED_IO_PORT */
    NULL,                           /* 0x0A, Reserved */
    NULL,                           /* 0x0B, Reserved */
    NULL,                           /* 0x0C, Reserved */
    NULL,                           /* 0x0D, Reserved */
    NULL,                           /* 0x0E, ACPI_RESOURCE_NAME_SMALL_VENDOR */
    NULL,                           /* 0x0F, ACPI_RESOURCE_NAME_END_TAG (not used) */

    /* Large descriptors */

    NULL,                           /* 0x00, Reserved */
    AcpiDmMemory24Tags,             /* 0x01, ACPI_RESOURCE_NAME_MEMORY_24 */
    AcpiDmRegisterTags,             /* 0x02, ACPI_RESOURCE_NAME_GENERIC_REGISTER */
    NULL,                           /* 0x03, Reserved */
    NULL,                           /* 0x04, ACPI_RESOURCE_NAME_LARGE_VENDOR */
    AcpiDmMemory32Tags,             /* 0x05, ACPI_RESOURCE_NAME_MEMORY_32 */
    AcpiDmFixedMemory32Tags,        /* 0x06, ACPI_RESOURCE_NAME_FIXED_MEMORY_32 */
    AcpiDmAddress32Tags,            /* 0x07, ACPI_RESOURCE_NAME_DWORD_ADDRESS_SPACE */
    AcpiDmAddress16Tags,            /* 0x08, ACPI_RESOURCE_NAME_WORD_ADDRESS_SPACE */
    AcpiDmInterruptTags,            /* 0x09, ACPI_RESOURCE_NAME_EXTENDED_XRUPT */
    AcpiDmAddress64Tags,            /* 0x0A, ACPI_RESOURCE_NAME_QWORD_ADDRESS_SPACE */
    AcpiDmExtendedAddressTags       /* 0x0B, ACPI_RESOURCE_NAME_EXTENDED_ADDRESS_SPACE */
};


/*
 * Globals used to generate unique resource descriptor names. We use names that
 * start with underscore and a prefix letter that is not used by other ACPI
 * reserved names. To this, we append hex 0x00 through 0xFF. These 5 prefixes
 * allow for 5*256 = 1280 unique names, probably sufficient for any single ASL
 * file. If this becomes too small, we can use alpha+numerals for a total
 * of 5*36*36 = 6480.
 */
#define ACPI_NUM_RES_PREFIX     5

static UINT32                   AcpiGbl_NextResourceId = 0;
static UINT8                    AcpiGbl_NextPrefix = 0;
static UINT8                    AcpiGbl_Prefix[ACPI_NUM_RES_PREFIX] =
                                    {'Y','Z','J','K','X'};


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmCheckResourceReference
 *
 * PARAMETERS:  Op                  - Parse Op for the AML opcode
 *              WalkState           - Current walk state (with valid scope)
 *
 * RETURN:      None
 *
 * DESCRIPTION: Convert a reference to a resource descriptor to a symbolic
 *              reference if possible
 *
 * NOTE:        Bit index is used to transparently handle both resource bit
 *              fields and byte fields.
 *
 ******************************************************************************/

void
AcpiDmCheckResourceReference (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_OBJECT       *BufferNameOp;
    ACPI_PARSE_OBJECT       *IndexOp;
    ACPI_NAMESPACE_NODE     *BufferNode;
    ACPI_NAMESPACE_NODE     *ResourceNode;
    const ACPI_OPCODE_INFO  *OpInfo;
    char                    *Pathname;
    UINT32                  BitIndex;


    /* We are only interested in the CreateXxxxField opcodes */

    OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
    if (OpInfo->Type != AML_TYPE_CREATE_FIELD)
    {
        return;
    }

    /* Get the buffer term operand */

    BufferNameOp = AcpiPsGetDepthNext (NULL, Op);

    /* Must be a named buffer, not an arg or local or method call */

    if (BufferNameOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP)
    {
        return;
    }

    /* Get the Index term, must be an integer constant to convert */

    IndexOp = BufferNameOp->Common.Next;
    OpInfo = AcpiPsGetOpcodeInfo (IndexOp->Common.AmlOpcode);
    if (OpInfo->ObjectType != ACPI_TYPE_INTEGER)
    {
        return;
    }

    /* Get the bit offset of the descriptor within the buffer */

    if ((Op->Common.AmlOpcode == AML_CREATE_BIT_FIELD_OP) ||
        (Op->Common.AmlOpcode == AML_CREATE_FIELD_OP))
    {
        /* Index operand is a bit offset */

        BitIndex = (UINT32) IndexOp->Common.Value.Integer;
    }
    else
    {
        /* Index operand is a byte offset, convert to bits */

        BitIndex = (UINT32) ACPI_MUL_8 (IndexOp->Common.Value.Integer);
    }

    /* Lookup the buffer in the namespace */

    Status = AcpiNsLookup (WalkState->ScopeInfo,
                BufferNameOp->Common.Value.String, ACPI_TYPE_BUFFER,
                ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT, WalkState,
                &BufferNode);
    if (ACPI_FAILURE (Status))
    {
        return;
    }

    /* Validate object type, we must have a buffer */

    if (BufferNode->Type != ACPI_TYPE_BUFFER)
    {
        return;
    }

    /* Find the resource descriptor node corresponding to the index */

    ResourceNode = AcpiDmGetResourceNode (BufferNode, BitIndex);
    if (!ResourceNode)
    {
        return;
    }

    /* Translate the Index to a resource tag pathname */

    Pathname = AcpiGetTagPathname (BufferNode, ResourceNode, BitIndex);
    if (Pathname)
    {
        /* Complete the conversion of the Index to a symbol */

        IndexOp->Common.AmlOpcode = AML_INT_NAMEPATH_OP;
        IndexOp->Common.Value.String = Pathname;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDmGetResourceNode
 *
 * PARAMETERS:  BufferNode          - Node for the parent buffer
 *              BitIndex            - Index into the resource descriptor
 *
 * RETURN:      Namespace node for the resource descriptor. NULL if not found
 *
 * DESCRIPTION: Find a resource descriptor that corresponds to the bit index
 *
 ******************************************************************************/

static ACPI_NAMESPACE_NODE *
AcpiDmGetResourceNode (
    ACPI_NAMESPACE_NODE     *BufferNode,
    UINT32                  BitIndex)
{
    ACPI_NAMESPACE_NODE     *Node;
    UINT32                  ByteIndex = ACPI_DIV_8 (BitIndex);


    /*
     * Child list contains an entry for each resource descriptor. Find
     * the descriptor that corresponds to the Index.
     *
     * If there are no children, this is not a resource template
     */
    Node = BufferNode->Child;
    while (Node)
    {
        /*
         * Check if the Index falls within this resource.
         *
         * Value contains the resource offset, Object contains the resource
         * length (both in bytes)
         */
        if ((ByteIndex >= Node->Value) &&
            (ByteIndex < (Node->Value + Node->Length)))
        {
            return (Node);
        }

        /* List is circular, this flag marks the end */

        if (Node->Flags & ANOBJ_END_OF_PEER_LIST)
        {
            return (NULL);
        }

        Node = Node->Peer;
    }

    return (NULL);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiGetTagPathname
 *
 * PARAMETERS:  BufferNode          - Node for the parent buffer
 *              ResourceNode        - Node for a resource descriptor
 *              BitIndex            - Index into the resource descriptor
 *
 * RETURN:      Full pathname for a resource tag. NULL if no match.
 *              Path is returned in AML (packed) format.
 *
 * DESCRIPTION: Convert a BitIndex into a symbolic resource tag (full pathname)
 *
 ******************************************************************************/

static char *
AcpiGetTagPathname (
    ACPI_NAMESPACE_NODE     *BufferNode,
    ACPI_NAMESPACE_NODE     *ResourceNode,
    UINT32                  BitIndex)
{
    ACPI_STATUS             Status;
    UINT32                  ResourceBitIndex;
    UINT8                   ResourceTableIndex;
    ACPI_SIZE               RequiredSize;
    char                    *Pathname;
    AML_RESOURCE            *Aml;
    ACPI_PARSE_OBJECT       *Op;
    char                    *InternalPath;
    char                    *Tag;


    /* Get the Op that contains the actual buffer data */

    Op = BufferNode->Op->Common.Value.Arg;
    Op = Op->Common.Next;
    if (!Op)
    {
        return (NULL);
    }

    /* Get the individual resource descriptor and validate it */

    Aml = ACPI_CAST_PTR (AML_RESOURCE,
            &Op->Named.Data[ResourceNode->Value]);

    Status = AcpiUtValidateResource (Aml, &ResourceTableIndex);
    if (ACPI_FAILURE (Status))
    {
        return (NULL);
    }

    /* Get offset into this descriptor (from offset into entire buffer) */

    ResourceBitIndex = BitIndex - ACPI_MUL_8 (ResourceNode->Value);

    /* Get the tag associated with this resource descriptor and offset */

    Tag = AcpiDmGetResourceTag (ResourceBitIndex, Aml, ResourceTableIndex);
    if (!Tag)
    {
        return (NULL);
    }

    /*
     * Now that we know that we have a reference that can be converted to a
     * symbol, change the name of the resource to a unique name.
     */
    AcpiDmUpdateResourceName (ResourceNode);

    /* Get the full pathname to the parent buffer */

    RequiredSize = AcpiNsGetPathnameLength (BufferNode);
    Pathname = ACPI_ALLOCATE_ZEROED (RequiredSize + ACPI_PATH_SEGMENT_LENGTH);
    if (!Pathname)
    {
        return (NULL);
    }

    AcpiNsBuildExternalPath (BufferNode, RequiredSize, Pathname);

    /*
     * Create the full path to the resource and tag by: remove the buffer name,
     * append the resource descriptor name, append a dot, append the tag name.
     *
     * TBD: Always using the full path is a bit brute force, the path can be
     * often be optimized with carats (if the original buffer namepath is a
     * single nameseg). This doesn't really matter, because these paths do not
     * end up in the final compiled AML, it's just an appearance issue for the
     * disassembled code.
     */
    Pathname[ACPI_STRLEN (Pathname) - ACPI_NAME_SIZE] = 0;
    ACPI_STRNCAT (Pathname, ResourceNode->Name.Ascii, ACPI_NAME_SIZE);
    ACPI_STRCAT (Pathname, ".");
    ACPI_STRNCAT (Pathname, Tag, ACPI_NAME_SIZE);

    /* Internalize the namepath to AML format */