Red Bear OS
3fd4403ecb
Beautification pass on the text UI (all pure ASCII so it renders identically on
the UEFI Unicode console and the VGA CP437 console, which truncates chars to
bytes):
- Os::text_columns(): new trait method to query the real console width.
BIOS returns the VGA width; UEFI queries SimpleTextOutput QueryMode for the
current mode's columns (both fall back to 80). Enables true centering.
- draw_header now draws a full-width frame around a centered figlet "RedBear
OS" wordmark, with a centered version/platform subtitle, in brand red/cyan.
Falls back to a plain centered name on consoles narrower than the wordmark.
- Loading progress lines (live / kernel / initfs) gain a fixed-width ASCII
progress bar next to the MiB counters, and turn green on completion.
- A centered green "Booting RedBear OS..." closes the loading screen.
Verified: cargo check passes for x86_64-unknown-uefi (--bin) and
x86-unknown-none (--lib).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Bootloader
Redox OS Bootloader
Requirements
These software needs to be available on the PATH at build time:
Building
make TARGET=<triplet> BUILD=build all
The <triplet> is one of:
| ARCH | Boot Mode | Triplets |
|---|---|---|
i686 |
BIOS | x86-unknown-none |
x86_64 |
BIOS | x86-unknown-none |
x86_64 |
UEFI | x86_64-unknown-uefi |
aarch64 |
UEFI | aarch64-unknown-uefi |
riscv64gc |
UEFI | riscv64gc-unknown-uefi |
See mk directory for more information of how the build is working.
Entry points
Please read Boot Process in the Redox OS Book for an introductory guide.
In this source code, some interesting files for entry points are:
- BIOS boot stages: asm/x86-unknown-none/bootloader.asm
- BIOS boot entry:
fn startat src/os/bios/mod.rs - UEFI boot entry:
fn mainat src/os/uefi/mod.rs - Common boot process:
fn mainat src/main.rs - UEFI kernel entry:
fn kernel_entryin each arch:x86_64: src/os/uefi/arch/x86_64.rsaarch64: src/os/uefi/arch/aarch64.rsriscv64gc: src/os/uefi/arch/riscv64/mod.rs
Debugging
QEMU
make TARGET=<triplet> BUILD=build qemu
How To Contribute
To learn how to contribute to this system component you need to read the following document:
Development
To learn how to do development with this system component inside the Redox build system you need to read the Build System and Coding and Building pages.