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.
90 lines
2.9 KiB
Rust
90 lines
2.9 KiB
Rust
/*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2018 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]
|
|
#![feature(asm)]
|
|
|
|
const MMIO_BASE: u32 = 0x3F00_0000;
|
|
|
|
mod gpio;
|
|
mod mbox;
|
|
mod uart;
|
|
|
|
use core::sync::atomic::{compiler_fence, Ordering};
|
|
|
|
fn kernel_entry() -> ! {
|
|
let mut mbox = mbox::Mbox::new();
|
|
let uart = uart::Uart::new();
|
|
|
|
// set up serial console
|
|
match uart.init(&mut mbox) {
|
|
Ok(_) => uart.puts("\n[0] UART is live!\n"),
|
|
Err(_) => loop {
|
|
unsafe { asm!("wfe" :::: "volatile") }; // If UART fails, abort early
|
|
},
|
|
}
|
|
|
|
uart.puts("[1] Press a key to continue booting... ");
|
|
uart.getc();
|
|
uart.puts("Greetings fellow Rustacean!\n");
|
|
|
|
// get the board's unique serial number with a mailbox call
|
|
mbox.buffer[0] = 8 * 4; // length of the message
|
|
mbox.buffer[1] = mbox::REQUEST; // this is a request message
|
|
mbox.buffer[2] = mbox::tag::GETSERIAL; // get serial number command
|
|
mbox.buffer[3] = 8; // buffer size
|
|
mbox.buffer[4] = 8;
|
|
mbox.buffer[5] = 0; // clear output buffer
|
|
mbox.buffer[6] = 0;
|
|
mbox.buffer[7] = mbox::tag::LAST;
|
|
|
|
// Insert a compiler fence that ensures that all stores to the
|
|
// mbox buffer are finished before the GPU is signaled (which is
|
|
// done by a store operation as well).
|
|
compiler_fence(Ordering::Release);
|
|
|
|
// send the message to the GPU and receive answer
|
|
let serial_avail = match mbox.call(mbox::channel::PROP) {
|
|
Err(_) => false,
|
|
Ok(()) => true,
|
|
};
|
|
|
|
if serial_avail {
|
|
uart.puts("[i] My serial number is: 0x");
|
|
uart.hex(mbox.buffer[6]);
|
|
uart.hex(mbox.buffer[5]);
|
|
uart.puts("\n");
|
|
} else {
|
|
uart.puts("[i] Unable to query serial!\n");
|
|
}
|
|
|
|
// echo everything back
|
|
loop {
|
|
uart.send(uart.getc());
|
|
}
|
|
}
|
|
|
|
raspi3_boot::entry!(kernel_entry);
|