Labels:text | screenshot | font | document | yellow OCR: VhkdCritihitMsg() : This function is called when the VxD starts and gets the SysCntinitMsg from Windows, HkinstallHooks() "This function uses the VMM fault hooking mechanism to install the ISR hook .. HkScheduleFreq() :: This function reprograms the 8254 and starts the ISR hook sy stem. HkPmIRQOFaultHook() :: This is the first part of the ISR to receive control when the interrupt occurs, Three of these procedures exist, one for the PM mode, one for the VMM mode and one for the V86 mode. It simply sets a mode ID and calls the next stage of the ISR HkGenIRQOFaultHook() :: This function does most of the work in the ISR. It keeps a frequency count. Since the interrupt goes off at the new frequency, it also checks when the old frequency is reached and calls the old ISR. Figure 8: Call graph for the major functions in Listing One.
