- Call back function on EFI_EVENT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r
-\r
- Fixup internal data so that the driver is callable in EFI runtime \r
- in virtual mode. Convert gRT to virtual address. gRT is from \r
- UefiRuntimeServicesTableLib class. It is not fixed up by \r
- UefiRuntimeServicesTableLib instance.\r
-\r
- @param Event Event whose notification function is being invoked.\r
- @param Context The context of the Notification context. Not used in\r
- this call back function.\r
+ Returns the next high 32 bits of the platform's monotonic counter.\r
+\r
+ The GetNextHighMonotonicCount() function returns the next high 32 bits \r
+ of the platform's monotonic counter. The platform's monotonic counter is \r
+ comprised of two 32 bit quantities: the high 32 bits and the low 32 bits. \r
+ During boot service time the low 32 bit value is volatile: it is reset to \r
+ zero on every system reset and is increased by 1 on every call to GetNextMonotonicCount().\r
+ The high 32 bit value is non-volatile and is increased by 1 whenever the system resets \r
+ or whenever the low 32 bit count [returned by GetNextMonoticCount()] overflows.\r
+ The GetNextMonotonicCount() function is only available at boot services time. \r
+ If the operating system wishes to extend the platform monotonic counter to runtime, \r
+ it may do so by utilizing GetNextHighMonotonicCount(). To do this, before calling \r
+ ExitBootServices() the operating system would call GetNextMonotonicCount() to obtain \r
+ the current platform monotonic count. The operating system would then provide an \r
+ interface that returns the next count by: \r
+ Adding 1 to the last count.\r
+ Before the lower 32 bits of the count overflows, call GetNextHighMonotonicCount(). \r
+ This will increase the high 32 bits of the platform's non-volatile portion of the monotonic \r
+ count by 1.\r
+\r
+ This function may only be called at Runtime.\r
+\r
+ @param[out] HighCount Pointer to returned value.\r
+\r
+ @retval EFI_INVALID_PARAMETER If HighCount is NULL.\r
+ @retval EFI_SUCCESS Operation is successful.\r
+ @retval EFI_OUT_OF_RESOURCES If variable service reports that not enough storage \r
+ is available to hold the variable and its data.\r
+ @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.\r