Timer value logged at the point when the OS loader calls the ExitBootServices function for UEFI compatible firmware. For non-UEFI compatible boots, this field must be zero.
Timer value logged at the point just prior towhen the OS loader gaining control back from calls the ExitBootServices function for UEFI compatible firmware. For non-UEFI compatible boots, this field must be zero.
Timer value logged just prior to loading the OS boot loader into memory. For non-UEFI compatible boots, this field must be zero.
Timer value logged just prior to launching the previously loaded OS boot loader image. For non-UEFI compatible boots, the timer value logged will be just prior to the INT 19h handler invocation.
Timer value logged at the beginning of firmware image execution. This may not always be zero or near zero.
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FPDT Firmware Basic Boot Performance Record Structure