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38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
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//! BSP console facilities.
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use super::memory;
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use crate::{bsp::device_driver, console};
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use core::fmt;
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// In case of a panic, the panic handler uses this function to take a last shot at printing
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/// something before the system is halted.
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///
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/// We try to init panic-versions of the GPIO and the UART. The panic versions are not protected
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/// with synchronization primitives, which increases chances that we get to print something, even
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/// when the kernel's default GPIO or UART instances happen to be locked at the time of the panic.
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///
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/// # Safety
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///
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/// - Use only for printing during a panic.
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pub unsafe fn panic_console_out() -> impl fmt::Write {
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let mut panic_gpio = device_driver::PanicGPIO::new(memory::map::mmio::GPIO_START);
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let mut panic_uart = device_driver::PanicUart::new(memory::map::mmio::PL011_UART_START);
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panic_gpio.map_pl011_uart();
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panic_uart.init();
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panic_uart
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}
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/// Return a reference to the console.
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pub fn console() -> &'static impl console::interface::All {
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&super::PL011_UART
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}
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