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README: Mention xv6, notes on terminology from xv6 book

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README.md
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# Neptune Kernel # Neptune Kernel
Inspired by xv6
For a quick reference on RISC-V assembly: For a quick reference on RISC-V assembly:
- https://risc-v.guru/instructions/ - https://risc-v.guru/instructions/
@ -9,6 +11,10 @@ Toolchains:
--- ---
> A word on terminology: Although the official x86 term is exception, xv6 uses the
> term trap, largely because it was the term used by the PDP11/40 and therefore is the
> conventional Unix term.
| Register | Name | Privilege Level | Description | | Register | Name | Privilege Level | Description |
|-------------|----------------------------|------------------|-----------------------------------------------------------------------------| |-------------|----------------------------|------------------|-----------------------------------------------------------------------------|
| `mstatus` | Machine Status Register | Machine | Holds global interrupt enable, previous privilege mode, etc. | | `mstatus` | Machine Status Register | Machine | Holds global interrupt enable, previous privilege mode, etc. |