zynq-rs/src/main.rs

51 lines
973 B
Rust
Raw Normal View History

2019-05-05 20:56:23 +08:00
#![no_std]
#![no_main]
#![feature(asm)]
//[feature(global_asm)]
#![feature(naked_functions)]
use panic_abort as _;
use r0::zero_bss;
mod cortex_a9;
mod slcr;
mod uart;
use uart::Uart;
extern "C" {
static mut __bss_start: u32;
static mut __bss_end: u32;
static mut __end: u32;
}
#[link_section = ".text.boot"]
#[no_mangle]
#[naked]
pub unsafe extern "C" fn _boot_cores() -> ! {
use cortex_a9::{asm, regs::*};
const CORE_MASK: u32 = 0x3;
// End of OCM RAM
const STACK_START: u32 = 256 << 10;
match MPIDR.get() & CORE_MASK {
0 => {
SP.set(STACK_START);
zero_bss(&mut __bss_start, &mut __bss_end);
main();
panic!("return from main");
}
_ => loop {
// if not core0, infinitely wait for events
asm::wfe();
},
}
}
fn main() {
let uart = Uart::uart0();
for b in "Hello World\r\n".bytes() {
uart.write_byte(b);
}
}