ruspiro-boot 0.5.4

Bare metal boot strapper code for the Raspberry Pi 3 to conviniently start a custom kernel within the Rust environment without the need to deal with all the initial setup like stack pointers, switch to the appropriate exeption level and getting all cores kicked off for processing of code compiled from Rust.
Documentation 
/***************************************************************************************************
 * Copyright (c) 2019 by the authors
 *
 * Author: André Borrmann
 * License: Apache License 2.0
 **************************************************************************************************/
//! Build script to pre-compile the assembly files containing the majority of the bootstrap code
//! and some initial configuration required before rust code could pick up processing
//!

extern crate cc;
use std::env;

fn main() {
  let script_location = env::current_dir().unwrap();

  if let Some(target_arch) = env::var_os("CARGO_CFG_TARGET_ARCH") {
    if target_arch == "aarch64" && env::var("DOCS_RS").is_err() {
      cc::Build::new()
        .file("src/asm/aarch64/bootstrap.S")
        .flag("-march=armv8-a")
        .compile("bootstrap");
      cc::Build::new()
        .file("src/asm/aarch64/exceptionvector.S")
        .flag("-march=armv8-a")
        .compile("excvector");
      // print the linker file location of the boot crate to the env-variables
      println!("cargo:linkerscript={}/link64.ld", script_location.display());

      println!("cargo:rerun-if-changed=link64.ld");
      println!("cargo:rerun-if-changed=src/asm/aarch64/bootstrap.S");
      println!("cargo:rerun-if-changed=src/asm/aarch64/exceptionvector.S");
    }
  }
}