WinMSR is a Windows 64-bits driver which provides access to the cpuid instruction and the msr registers in the processor ring 0.

This example returns the temperature of the Intel i7 Processor Cores.

1- GCC MinGW 64-bit compiler
2- Code::Blocks standalone version
3- DebugView

• driver.c The kernel driver source code
• WinMSR.cbp The Code::Blocks project file
• WinMSR.reg The registry setup

• Once built, copy the device driver into the Windows drivers directory

copy WinMSR.sys C:\Windows\System32\drivers\

• Load the WinMSR.reg file into the registry

• Load the "Debug Print Filter.reg" file into the registry to enable DbgPrint()

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Debug Print Filter] "DEFAULT"=dword:00000008

• When booting Windows press the F8 key then choose the option to disable the driver signature verification

1- Start DebugView : choose the option [Capture Kernel]

2- Run a command prompt

• Start the service

net start WinMSR

• Stop the service

net stop WinMSR