MyVibeOS

MyVibeOS is a teaching-oriented RISC-V monolithic kernel project targeting
QEMU `riscv64 virt` with the boot flow fixed as `OpenSBI -> S-mode kernel`.

The OS is developed by using GPT-5.4, the prompts used on building this OS
can be found in prompts/. The prompts are written in Chinese, you can translate
them into any language at ease by using AI.

About Token consumption: 4~5 5-hour token quota using codex.

Stage 1 goals:
- boot a minimal S-mode kernel through OpenSBI
- route console input/output, shell I/O, logs, and panic output through SBI
- enter a tiny kernel shell automatically after boot
- support `help`, `dmesg`, and `halt`

Project layout:
- `kernel/`      kernel code
- `user/`        reserved for user code
- `libs/`        reserved for user-space libraries
- `build/`       generated build artifacts
- `utils/`       shared helpers
- `host-tools/`  host-side helper scripts

Key commands:
- `make`         build `build/MyVibeOS.elf`
- `make run`     build and run on QEMU with OpenSBI
- `make cscope`  generate cscope files if available, otherwise ctags tags
- `make clean`   remove `build/` and generated tag files

Notes:
- The current kernel intentionally avoids direct UART/MMIO access.
- Console support relies on the OpenSBI-provided SBI console calls.