bootloader
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rust-osdev
No serial print
Hi again, I want to output some text, so I searched this repository and found serial.rs in the test framework. So I copied it and ran https://paste.skyslycer.de/fvkbX.
The only thing actually showing up tho is the startup text. https://upload.skyslycer.de/qemu-system-x86_64_ios9o2Xd0E.png
Any ideas?
The serial text is not printed to the screen. You need to tell QEMU how to handle it. For example, you could pass -serial stdio to QEMU to print the serial output to the stdout of the terminal.
The serial text is not printed to the screen. You need to tell QEMU how to handle it. For example, you could pass
-serial stdioto QEMU to print the serial output to the stdout of the terminal.
Would that work with a physical machine?
On a real machine you run the OS directly on the hardware, so you don't use QEMU. The serial port is an actual physical interface there, but you probably won't find it on modern computers anymore. You might be able to use an adapter, but I don't have any experience with that.
How do I print it to the screen then? Frame buffers? Don't see any good examples/documentation.
Are you using BIOS or UEFI? For BIOS you can either use VGA text mode, or a VGA or VESA framebuffer. For UEFI you have to use a GOP framebuffer. Versions of bootloader from before UEFI support was added, have VGA text mode set up by default. The versions with UEFI support have a VGA or GOP framebuffer set up and pass you a pointer to it in the BootInfo struct.
Are you using BIOS or UEFI? For BIOS you can either use VGA text mode, or a VGA or VESA framebuffer. For UEFI you have to use a GOP framebuffer. Versions of bootloader from before UEFI support was added, have VGA text mode set up by default. The versions with UEFI support have a VGA or GOP framebuffer set up and pass you a pointer to it in the BootInfo struct.
Is there anything universal or a library?
This is the code the bootloader crate uses for logging: https://github.com/rust-osdev/bootloader/blob/ac46d0455b41c11e5d316348d068df1c495ce0af/src/binary/logger.rs It uses the noto_sans_mono_bitmap crate for rendering the Noto Sans Mono font to a framebuffer.
This is the code the bootloader crate uses for logging: https://github.com/rust-osdev/bootloader/blob/ac46d0455b41c11e5d316348d068df1c495ce0af/src/binary/logger.rs It uses the noto_sans_mono_bitmap crate for rendering the Noto Sans Mono font to a framebuffer.
I can't seem to be able to use that correctly. For testing purposes, I just used the class and added the required crates. Then I used log::info!() to try to write something. It didn't.
https://upload.skyslycer.de/firefox_eFXZxYpYog.png This is everything I see. Not my desired output, in fact, no output from the kernel itself.
Are you trying to use the log crate? That won't work. You need to use the Logger type defined in the file I linked.