For x86_64 VGA text mode, write directly to 0xb8000:
use core::ptr::write_volatile;
const VGA_BUFFER: *mut u16 = 0xb8000 as *mut u16;
fn write_colored_char(c: u8, color: u8, x: usize, y: usize)
unsafe c as u16);
Or use crate console with ANSI codes if serial/stdio.
Since rCore banners can pull from a dynamic library of assets, you can serve thousands of variations of the same banner unit. This combats "ad fatigue"—the phenomenon where users ignore a banner because they have seen it 50 times before.
Google’s Core Web Vitals now impact SEO and ad visibility. Heavy banners can ruin a publisher’s LCP (Largest Contentful Paint) score. Because rCore banners are optimized to load asynchronously and weigh under 150KB, they preserve the user experience and ensure your ads actually render before the user scrolls away. rcore banners
rCore banners often serve as alert systems. Use color psychology consistently:
| Location | Purpose |
|----------|---------|
| bootloader output | Show before kernel init |
| main() entry point | Announce OS start |
| panic handler | Distinguish panic outputs |
| Shell/login | Welcome message |
Don't throw every element at the user at once. For x86_64 VGA text mode, write directly to
rCore’s reactive nature makes this transition smooth and intuitive.
The rCore banner is the visual logo and initialization message displayed by the rCore kernel during the boot process. Typically rendered in the system console (or UART output), it signifies that the kernel has successfully initialized basic hardware abstraction layers and is ready to accept user input.
A typical rCore banner looks something like this in the output logs: Or use crate console with ANSI codes if serial/stdio
_ _
_ __ | |__ __ _(_)_ __ ___ _ __ ___
| '_ \| '_ \ / _` | | '_ ` _ \| '_ \/ __|
| |_) | | | | (_| | | | | | | | |_) \__ \
| .__/|_| |_|\__, |_|_| |_| |_| .__/|___/
|_| |___/ |_|
This ASCII art is usually followed by critical system information, such as the kernel version, the target architecture (RISC-V, x86_64, or ARM), and memory status.
Instead of static images, future rCore banners will use generative AI to rewrite copy based on user role (Admin vs. Viewer vs. Billing Manager).