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.
62 lines
2.4 KiB
Rust
62 lines
2.4 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
|
|
//
|
|
// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
|
|
|
|
//! BSP console facilities.
|
|
|
|
use super::memory;
|
|
use crate::{bsp::device_driver, console, cpu};
|
|
use core::fmt;
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
// Public Code
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
/// In case of a panic, the panic handler uses this function to take a last shot at printing
|
|
/// something before the system is halted.
|
|
///
|
|
/// We try to init panic-versions of the GPIO and the UART. The panic versions are not protected
|
|
/// with synchronization primitives, which increases chances that we get to print something, even
|
|
/// when the kernel's default GPIO or UART instances happen to be locked at the time of the panic.
|
|
///
|
|
/// # Safety
|
|
///
|
|
/// - Use only for printing during a panic.
|
|
pub unsafe fn panic_console_out() -> impl fmt::Write {
|
|
use crate::driver::interface::DeviceDriver;
|
|
|
|
let mut panic_gpio = device_driver::PanicGPIO::new(memory::map::mmio::GPIO_START.into_usize());
|
|
let mut panic_uart =
|
|
device_driver::PanicUart::new(memory::map::mmio::PL011_UART_START.into_usize());
|
|
|
|
// If remapping of the driver's MMIO already happened, take the remapped start address.
|
|
// Otherwise, take a chance with the default physical address.
|
|
let maybe_gpio_mmio_start_addr = super::GPIO.virt_mmio_start_addr();
|
|
let maybe_uart_mmio_start_addr = super::PL011_UART.virt_mmio_start_addr();
|
|
|
|
panic_gpio
|
|
.init(maybe_gpio_mmio_start_addr)
|
|
.unwrap_or_else(|_| cpu::wait_forever());
|
|
panic_gpio.map_pl011_uart();
|
|
panic_uart
|
|
.init(maybe_uart_mmio_start_addr)
|
|
.unwrap_or_else(|_| cpu::wait_forever());
|
|
|
|
panic_uart
|
|
}
|
|
|
|
/// Return a reference to the console.
|
|
pub fn console() -> &'static impl console::interface::All {
|
|
&super::PL011_UART
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
// Testing
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
/// Minimal code needed to bring up the console in QEMU (for testing only). This is often less steps
|
|
/// than on real hardware due to QEMU's abstractions.
|
|
///
|
|
/// For the RPi, nothing needs to be done.
|
|
pub fn qemu_bring_up_console() {}
|