Octox running in qemu consumes 400% cpu time

[tangledmass]

Hi there!

good work! There still are some rough edges. The most prominent is: Octox running in qemu consumes 400% cpu time. This makes examining Octox very hard on a laptop, especially in summer times. Having an idle loop in the kernel that sends the cpu to sleep would be a plus!

Software stack

Octox initial commit.

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm

$ rustc --version
rustc 1.73.0-nightly (6ef7d16be 2023-08-19)

$ qemu-system-riscv64 --version
QEMU emulator version 7.2.4 (Debian 1:7.2+dfsg-7+deb12u1)
Copyright (c) 2003-2022 Fabrice Bellard and the QEMU Project developers