Kernel library crate for xous
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
xous-kernel/src/main.rs

86 lines
1.8 KiB

#![no_std]
#![no_main]
extern crate vexriscv;
#[macro_use]
mod debug;
mod definitions;
mod irq;
mod macros;
mod mem;
mod processtable;
mod syscalls;
mod timer;
pub use irq::sys_interrupt_claim;
use core::panic::PanicInfo;
use mem::MemoryManager;
use processtable::ProcessTable;
use vexriscv::register::{mcause, mie, mstatus, vmim, vmip};
use xous_kernel_riscv_rt::xous_kernel_entry;
#[panic_handler]
fn handle_panic(arg: &PanicInfo) -> ! {
println!("PANIC!");
println!("Details: {:?}", arg);
loop {}
}
#[xous_kernel_entry]
fn xous_main() -> ! {
unsafe {
vmim::write(0); // Disable all machine interrupts
mie::set_msoft();
mie::set_mtimer();
mie::set_mext();
mstatus::set_mie(); // Enable CPU interrupts
}
let uart = debug::DEFAULT_UART;
sys_interrupt_claim(0, timer::irq).unwrap();
timer::time_init();
// Enable "RX_EMPTY" interrupt
uart.enable_rx();
println!("Starting up...");
sys_interrupt_claim(2, debug::irq).unwrap();
println!("Creating memory manager...");
let mut mm = MemoryManager::new();
println!("Creating process table...");
ProcessTable::new(mm, kmain);
panic!("fell off main");
}
fn kmain(mm: MemoryManager, pt: ProcessTable) -> ! {
println!("Entering main loop");
let mut last_time = timer::get_time();
loop {
let new_time = timer::get_time();
if new_time >= last_time + 1000 {
last_time = new_time;
println!("Uptime: {} ms", new_time);
}
// unsafe { vexriscv::asm::wfi() };
}
}
#[no_mangle]
pub fn trap_handler() {
let mc = mcause::read();
let irqs_pending = vmip::read();
if mc.is_exception() {
unsafe { vexriscv::asm::ebreak() };
loop {}
}
if irqs_pending != 0 {
irq::handle(irqs_pending);
}
}