RegMaster

Disclaimer

The author is not responsible for any possible damage caused to hardware as a result of using this project.
This software does not guarantee any increase in performance and is intended for enthusiasts only.
You use this program at your own risk.

WinRing0 and inpoutx64 drivers may be blocked on Windows 11 22h2 and later, set VulnerableDriverBlocklistEnable to 0 in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\CI\Config to remove this limitation.

Features

• R/W MSR registers on different cores
• R/W MMIO data for 8, 16 or 32 bit operations
• Read PCI Configuration Space registers for byte, word or dword
• Scan and enumerate all PCI devices

Known Issues

• Devices tab may not work properly, especially device/vendor ids, so look at BDF address

Requirements

• Windows 10 or higher
• Administrator privileges
• Last version of RegMaster from releases
  

Usage

MSR

1. Select target core

For read operation, if All cores checkbox is selected, no core is selected or there are selected more than 1 core, it will be read on core 0.

2. Enter MSR index in Address field (e.g., 0x1a0)
3. Enter bit value (Bitfield or single bit) (if needed) — by default, the full bitmask is displayed
4. Click Read button to display current value
5. Modify value in EAX/EDX registers
6. Click Apply button to write changes back
7. Use Reset button to restore text boxes to default values

MMIO

1. Enter memory address in the Address field
2. Enter bit value (Bitfield or single bit) (if needed) — by default, the full bitmask is displayed
3. For write operations, after the 0x prefix, enter 2 digits for Byte values (e.g., 0x11), 4 for Word (0x10FA), or 8 for Dword (0x00000001)
4. Click Read button to display the current value as a full bitmask in Byte, Word, and Dword format
5. Use the registry section at the bottom to modify individual bits and click Apply button to save changes
6. Click Reset button to restore text boxes to default values

PCI Configuration

1. Enter Bus:Device:Function values
2. Enter offset value
3. Click Read button to display register value
4. Use Reset button to restore text boxes to default values

Resources & Credits

Inspired by chiptool

Troubleshooting

If you encounter errors or bugs, please report them via the issue tracker.
Sometimes, after reading/writing to some registries you can have BSOD screen. Just reboot your system.

License

This project is licensed under the MIT License - see the LICENSE file for details.