74 lines
1.6 KiB
Rust
74 lines
1.6 KiB
Rust
#![no_std]
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#![no_main]
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extern crate xous_riscv;
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mod syscalls;
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mod irq;
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mod macros;
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mod mem;
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pub use irq::sys_interrupt_claim;
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use core::panic::PanicInfo;
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use xous_kernel_riscv_rt::xous_kernel_entry;
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use xous_riscv::register::{mcause, mstatus, mie, vmim, vmip};
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use mem::MemoryManager;
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#[panic_handler]
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fn handle_panic(_arg: &PanicInfo) -> ! {
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loop {}
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}
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fn print_str(uart: *mut usize, s: &str) {
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for c in s.bytes() {
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unsafe { uart.write_volatile(c as usize) };
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}
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}
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#[xous_kernel_entry]
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fn xous_main() -> ! {
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unsafe {
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vmim::write(0); // Disable all machine interrupts
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mie::set_msoft();
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mie::set_mtimer();
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mie::set_mext();
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mstatus::set_mie(); // Enable CPU interrupts
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}
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let mm = MemoryManager::new();
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sys_interrupt_claim(2, |_| {
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let uart_ptr = 0xE000_1800 as *mut usize;
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print_str(uart_ptr, "hello, world!\r\n");
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// Acknowledge the IRQ
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unsafe {
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uart_ptr.add(0).read_volatile();
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// Acknowledge the event
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uart_ptr.add(4).write_volatile(3);
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};
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})
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.unwrap();
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// Enable interrupts
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let uart_ptr = 0xE000_1800 as *mut usize;
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unsafe { uart_ptr.add(4).write_volatile(3) };
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unsafe { uart_ptr.add(5).write_volatile(3) };
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print_str(uart_ptr, "greetings!\r\n");
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loop {
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unsafe { xous_riscv::asm::wfi() };
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}
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}
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#[no_mangle]
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pub fn trap_handler() {
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let mc = mcause::read();
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let irqs_pending = vmip::read();
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if mc.is_exception() {}
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if irqs_pending != 0 {
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irq::handle(irqs_pending);
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}
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}
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