Bitmask Calculator - NVIDIA Values

This was meant to be a normal bitmask calculator, but I decided to add features to it that made it possible to directly configure and apply NVIDIA values. You may have seen people sharing NVIDIA values with uncommon looking data, e.g.:

reg add "HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0001" /v RMElcg /t REG_DWORD /d 1431655765 /f

The tool loads all value names including their bit definitions, making it easy for you to understand what the data of 1431655765 truely does. After selecting an option, it updates the dec, hex, bin data and displays the bit positions. If you want to use the value, you can add it with the Reg Add button, which searches for the correct key.

It adds all values to the Display class key. There are values with the same names in the nvlddmkm\* key, but those won't get added via the tool. I may add a second section for nvlddmkm key values.

\Registry\Machine\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000 : RmProfilingAdminOnly
\Registry\Machine\SYSTEM\ControlSet001\Services\nvlddmkm\Global\NVTweak : RmProfilingAdminOnly

Note

The calculator uses an converted .json version of the official NVIDIA resource manager definitions. I've built the converter myself, and it should be 100% accurate. However, if you notice any obvious errors, please report them.

Preview:

nvbcpre.mp4

The tool currently has a selection of 967 values (nvvalues.txt). It works with my own .json converted bitfield definitions. This doesn't mean that all of them are configurable or used by your system. List of values, which got read on my system:

NVIDIA Display Class GUID Record

The lower right panel shows the .json code of the selected value, I used the Min Dark theme as template for colors:

min-dark.json | miguelsolorio

GUI Buttons

Button	Description
Reg Add	Adds the currently selected value to the key
Reg Del	Removes the currently selected value from the key
Disable All	Enables all DISABLE* / OFF / FALSE bits (fallback to DEFAULT)
Enable All	Enables all ENABLE* / ON / TRUE bits (fallback to DEFAULT)
Open Key	Opens the registry key within the display class GUID 4d36e968-e325-11ce-bfc1-08002be10318 which includes a value named DriverDesc with data of *NVIDIA*
Auto Config	Sets preconfigured experimental values, these aren't recommendations, only possible presumptions (grayed out, if there's no Configured value in the .json config)
Clear	Reverts bit states to *DEFAULT* (first fallback to EMPTY (0), second to any 0 value)

Bitmask Calculation

Get the lower bit range (25:24 -> 24), shift the dec or hex x times to the left (-shl). Combine all results with -bor, and done.

Example using RMGC6Parameters (disabling all):

"Name":  "RMGC6Parameters",
"Elements": [
  {
      "Field":  "SLEEP_AWARE_CALLBACK",
      "Bits":  "1:0",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLED", "Value":  "1" },
                      { "Name":  "ENABLED", "Value":  "3" }
                  ]
  },
  {
      "Field":  "DEFERRED_PMU_CALLBACK",
      "Bits":  "3:2",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLED", "Value":  "1" },
                      { "Name":  "ENABLED", "Value":  "3" }
                  ]
  },
  {
      "Field":  "PMU_HANDLE_MODESET",
      "Bits":  "5:4",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLED", "Value":  "1" },
                      { "Name":  "ENABLED", "Value":  "3" }
                  ]
  },
  {
      "Field":  "BSOD_MODESET",
      "Bits":  "7:6",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLED", "Value":  "1" },
                      { "Name":  "ENABLED", "Value":  "3" }
                  ]
  }
]

1. -shl using the lower bit range value

0x00000001 -shl 0
0x00000001 -shl 2
0x00000001 -shl 4
0x00000001 -shl 6

would result in 1, 4, 16, 64

2. Combine them with -bor

1 -bor 4 -bor 16 -bor 64

Output of 85, which is the result.

Different common scenario would be DisableDynamicPstate:

"Name":  "DisableDynamicPstate",
"Comment":  [
     "1 = Disable dynamic P-State/adaptive clocking",
     "0 = Do not disable dynamic P-State/adaptive clocking (default)",
 ],
"Elements":  [
      { "Name":  "DISABLE", "Value":  "0" },
      { "Name":  "ENABLE", "Value":  "1" }
  ]

The comment shows 1 = Enabled, 0 = Disabled, means bit 0 gets switched here.

Test yourself with the following example:

"Name":  "RMClkSlowDown",
"Elements":  [
  {
      "Field":  "NV",
      "Bits":  "23:22",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLE", "Value":  "1" },
                      { "Name":  "ENABLE", "Value":  "3" }
                  ]
  },
  {
      "Field":  "HOST",
      "Bits":  "25:24",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLE", "Value":  "1" },
                      { "Name":  "ENABLE", "Value":  "3" }
                  ]
  },
  {
      "Field":  "IDLE_PSTATE",
      "Bits":  "27:26",
      "Options":  [
                      { "Name":  "DEFAULT", "Value":  "0" },
                      { "Name":  "DISABLE", "Value":  "1" },
                      { "Name":  "ENABLE", "Value":  "3" }
                  ]
  }
]

Try to disable all of them.

Solution: Dec: 88080384
Hex: 0x05400000
Bin: 00000101010000000000000000000000

0x00000001 -shl 22
0x00000001 -shl 24
0x00000001 -shl 26

4194304 -bor 16777216 -bor 67108864
-> 88080384

More info about -shl & -bor can be found in the discord notes channel.