IOCTL Reference External Interface (Compact 2013)

10/16/2014

The IOCTL library provides an external interface made up of functions and global variables that communicate between the other modular libraries and the OAL and the kernel. The following table shows the programming elements in the external interface.

Programming Element	Description
g_oalIoCtlClockSpeed	This global variable contains information about the processor clock speed.
g_oalIoCtlInstructionSet	This global variable contains the processor instruction set identifier.
g_oalIoCtlPlatformOEM	This global variable contains information about the hardware platform OEM.
g_oalIoCtlPlatformType	This global variable contains information about the hardware platform type.
g_oalIoCtlProcessorCore	This global variable contains information about the processor core.
g_oalIoCtlProcessorName	This global variable contains information about the processor name.
g_oalIoCtlProcessorVendor	This global variable contains information about the processor vendor.
g_oalIoCtlTable	This global variable references the global IOCTL table defined in the hardware platform code.
OAL_IOCTL_HANDLER	This structure is a global IOCTL table that defines the procedure to be called for an IOCTL code.
OALIoCtlHalDDI	This function retrieves information and sends commands to the Ddi_hflat display driver.
OALIoCtlHalGetDeviceId	This function fills in a DEVICE_ID structure.
OALIoCtlHalGetDeviceInfo	This function provides information about the system parameters information (SPI) codes supported by the SystemParametersInfo function.
OALIoCtlHalGetHWEntropy	This function creates a 64-bit value that is unique to the hardware and does not change.
OALIoCtlHalGetRandomSeed	This function creates a 64-bit random number and stores it in the output buffer.
OALIoCtlHalGetRegSecureKeys	This function enables the OEM to extend the list of registry paths that should be protected from nontrusted applications.
OALIoCtlHalGetUUID	This function returns the universally unique identifier (UUID).
OALIoCtlHalInitRegistry	This function signals that the registry is active and that data from the OAL can now be propagated to the registry.
OALIoCtlHalReboot	This function supports a warm boot of the target device.
OALIoCtlProcessorInfo	This function handles a request by an application to retrieve microprocessor information from the OAL and store it in the PROCESSOR_INFO structure.

See Also

Reference

IOCTL Reference