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80 lines
2.4 KiB
Rust
80 lines
2.4 KiB
Rust
/*
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* MIT License
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*
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* Copyright (c) 2018 Jorge Aparicio
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* Copyright (c) 2018-2019 Andre Richter <andre.o.richter@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#![deny(missing_docs)]
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#![deny(warnings)]
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#![no_std]
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#![feature(global_asm)]
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//! Low-level boot of the Raspberry's processor
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extern crate panic_abort;
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/// Type check the user-supplied entry function.
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#[macro_export]
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macro_rules! entry {
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($path:path) => {
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/// # Safety
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///
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/// - User must ensure to provide a suitable main function for the
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/// platform.
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#[export_name = "main"]
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pub unsafe fn __main() -> ! {
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// type check the given path
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let f: fn() -> ! = $path;
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f()
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}
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};
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}
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/// Reset function.
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///
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/// Initializes the bss section before calling into the user's `main()`.
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///
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/// # Safety
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///
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/// - Only a single core must be active and running this function.
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#[no_mangle]
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pub unsafe extern "C" fn reset() -> ! {
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extern "C" {
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// Boundaries of the .bss section, provided by the linker script
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static mut __bss_start: u64;
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static mut __bss_end: u64;
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}
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// Zeroes the .bss section
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r0::zero_bss(&mut __bss_start, &mut __bss_end);
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extern "Rust" {
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fn main() -> !;
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}
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main();
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}
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// Disable all cores except core 0, and then jump to reset()
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global_asm!(include_str!("boot_cores.S"));
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