// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2018-2019 Andre Richter <andre.o.richter@gmail.com>

//! Board Support Package for the Raspberry Pi.

use crate::interface;
use core::fmt;

pub const BOOT_CORE_ID: u64 = 0;
pub const BOOT_CORE_STACK_START: u64 = 0x80_000;

/// A mystical, magical device for generating QEMU output out of the void.
struct QEMUOutput;

/// Implementing `console::Write` enables usage of the `format_args!` macros, which in turn are used
/// to implement the `kernel`'s `print!` and `println!` macros.
///
/// See [`src/print.rs`].
///
/// [`src/print.rs`]: ../../print/index.html
impl interface::console::Write for QEMUOutput {
    fn write_str(&mut self, s: &str) -> fmt::Result {
        for c in s.chars() {
            unsafe {
                core::ptr::write_volatile(0x3F20_1000 as *mut u8, c as u8);
            }
        }

        Ok(())
    }
}

//--------------------------------------------------------------------------------------------------
// Implementation of the kernel's BSP calls
//--------------------------------------------------------------------------------------------------

/// Returns a ready-to-use `console::Write` implementation.
pub fn console() -> impl interface::console::Write {
    QEMUOutput {}
}