You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.8 KiB
Rust
103 lines
2.8 KiB
Rust
/*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2018-2019 Andre Richter <andre.o.richter@gmail.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#![no_std]
|
|
#![no_main]
|
|
|
|
const MMIO_BASE: u32 = 0x3F00_0000;
|
|
|
|
mod delays;
|
|
mod gpio;
|
|
mod mbox;
|
|
mod uart;
|
|
|
|
use cortex_a::regs::*;
|
|
|
|
fn check_timer(uart: &uart::Uart) {
|
|
uart.puts(
|
|
"Testing EL1 access to timer registers:\
|
|
\n Delaying for 3 seconds now.\n",
|
|
);
|
|
delays::wait_usec(1_000_000);
|
|
uart.puts(" 1..");
|
|
delays::wait_usec(1_000_000);
|
|
uart.puts("2..");
|
|
delays::wait_usec(1_000_000);
|
|
uart.puts(
|
|
"3\
|
|
\n Works!\n\n",
|
|
);
|
|
}
|
|
|
|
fn check_daif(uart: &uart::Uart) {
|
|
uart.puts("Checking interrupt mask bits:\n");
|
|
|
|
let daif = DAIF.extract();
|
|
for x in &[
|
|
(" D: ", DAIF::D),
|
|
(" A: ", DAIF::A),
|
|
(" I: ", DAIF::I),
|
|
(" F: ", DAIF::F),
|
|
] {
|
|
uart.puts(x.0);
|
|
if daif.is_set(x.1) {
|
|
uart.puts("Masked.\n");
|
|
} else {
|
|
uart.puts("Unmasked.\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
fn kernel_entry() -> ! {
|
|
let gpio = gpio::GPIO::new();
|
|
let mut mbox = mbox::Mbox::new();
|
|
let uart = uart::Uart::new();
|
|
|
|
// set up serial console
|
|
match uart.init(&mut mbox, &gpio) {
|
|
Ok(_) => uart.puts("\n[0] UART is live!\n"),
|
|
Err(_) => loop {
|
|
cortex_a::asm::wfe() // If UART fails, abort early
|
|
},
|
|
}
|
|
|
|
uart.puts("[1] Press a key to continue booting... ");
|
|
uart.getc();
|
|
uart.puts("Greetings fellow Rustacean!\n");
|
|
|
|
uart.puts("[i] Executing in EL: ");
|
|
uart.dec(CurrentEL.read(CurrentEL::EL));
|
|
uart.puts("\n\n");
|
|
|
|
check_timer(&uart);
|
|
check_daif(&uart);
|
|
|
|
// echo everything back
|
|
loop {
|
|
uart.send(uart.getc());
|
|
}
|
|
}
|
|
|
|
raspi3_boot::entry!(kernel_entry);
|