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Andre Richter 089565762a Makefiles: Docker USB passthrough in Linux only Detect if we run on Linux. If so, dockerize Makefile targets that need access to USB devices. If we run on anything else, attempt to execute natively. This will enable non-Linux Unixes like macOS to run the chainboot target, given they install the needed Ruby dependencies.		4 years ago
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Tutorial 01 - Wait Forever

tl;dr

The project skeleton is set up; A small piece of assembly code runs that just halts all CPU cores executing the kernel code.

Custom link.ld linker script.
- Load address at 0x80_000
- Only .text section.
main.rs: Important inner attributes:
- #![no_std], #![no_main]
cpu.S: Assembly _start() function that executes wfe (Wait For Event), halting all cores that are executing _start().
We (have to) define a #[panic_handler] function.
- Just waits infinitely for a cpu event.

In the project folder, invoke QEMU and observe the CPU core spinning on wfe:

$ make qemu
[...]
IN:
0x00080000:  d503205f  wfe
0x00080004:  17ffffff  b        #0x80000