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 * NOTE: This function should only be called after AcpiEnableSubsystem has

 * been called. This is because any _REG methods associated with the Space ID

 * are executed here, and these methods can only be safely executed after

 * the default handlers have been installed and the hardware has been

 * initialized (via AcpiEnableSubsystem.)

 *

    /*

     * For the default SpaceIDs, (the IDs for which there are default region handlers

     * installed) Only execute the _REG methods if the global initialization _REG

     * methods have already been run (via AcpiInitializeObjects). In other words,

     * we will defer the execution of the _REG methods for these SpaceIDs until

     * execution of AcpiInitializeObjects. This is done because we need the handlers

     * for the default spaces (mem/io/pci/table) to be installed before we can run

     * any control methods (or _REG methods). There is known BIOS code that depends

     * on this.

     *

     * For all other SpaceIDs, we can safely execute the _REG methods immediately.

     * This means that for IDs like EmbeddedController, this function should be called

     * only after AcpiEnableSubsystem has been called.

     */

    switch (SpaceId)

    {

    case ACPI_ADR_SPACE_SYSTEM_MEMORY:

    case ACPI_ADR_SPACE_SYSTEM_IO:

    case ACPI_ADR_SPACE_PCI_CONFIG:

    case ACPI_ADR_SPACE_DATA_TABLE:

        if (!AcpiGbl_RegMethodsExecuted)

        {

            /* We will defer execution of the _REG methods for this space */

            goto UnlockAndExit;

        }

        break;

    default:

        break;

    }