| Syntax: | Default: |
| /Gr[+|-] | /Gr- |
Use /Gr to generate object code that runs at ring 0. Use this option if you are writing code, such as operating systems, that will run at ring 0 instead of ring 3.
Note: To use /Gr, you must also specify /Rn.
By default, object code is not allowed to run at ring 0.
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Summary of Compiler Options
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Developing Virtual
Device Drivers in OS/2