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48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2023 Andre Richter <andre.o.richter@gmail.com>
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//! BSP console facilities.
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use crate::console;
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use core::fmt;
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//--------------------------------------------------------------------------------------------------
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// Private Definitions
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//--------------------------------------------------------------------------------------------------
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/// A mystical, magical device for generating QEMU output out of the void.
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struct QEMUOutput;
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//--------------------------------------------------------------------------------------------------
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// Private Code
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//--------------------------------------------------------------------------------------------------
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/// Implementing `core::fmt::Write` enables usage of the `format_args!` macros, which in turn are
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/// used to implement the `kernel`'s `print!` and `println!` macros. By implementing `write_str()`,
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/// we get `write_fmt()` automatically.
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///
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/// See [`src/print.rs`].
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///
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/// [`src/print.rs`]: ../../print/index.html
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impl fmt::Write for QEMUOutput {
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fn write_str(&mut self, s: &str) -> fmt::Result {
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for c in s.chars() {
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unsafe {
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core::ptr::write_volatile(0x3F20_1000 as *mut u8, c as u8);
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}
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}
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Ok(())
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}
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}
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Return a reference to the console.
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pub fn console() -> impl console::interface::Write {
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QEMUOutput {}
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}
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