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https://github.com/phil-opp/blog_os.git
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109 lines
2.5 KiB
Rust
109 lines
2.5 KiB
Rust
// Copyright 2015 Philipp Oppermann. See the README.md
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(lang_items)]
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#![feature(const_fn, unique)]
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#![feature(alloc, collections)]
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#![feature(asm)]
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#![feature(drop_types_in_const)]
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#![feature(heap_api)]
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#![no_std]
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extern crate rlibc;
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extern crate spin;
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extern crate multiboot2;
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#[macro_use]
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extern crate bitflags;
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extern crate x86;
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#[macro_use]
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extern crate once;
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extern crate hole_list_allocator;
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extern crate alloc;
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#[macro_use]
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extern crate collections;
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extern crate bit_field;
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#[macro_use]
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mod vga_buffer;
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mod memory;
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mod interrupts;
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#[no_mangle]
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pub extern "C" fn rust_main(multiboot_information_address: usize) {
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// ATTENTION: we have a very small stack and no guard page
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vga_buffer::clear_screen();
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println!("Hello World{}", "!");
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let boot_info = unsafe { multiboot2::load(multiboot_information_address) };
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enable_nxe_bit();
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enable_write_protect_bit();
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// set up guard page and map the heap pages
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memory::init(boot_info);
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interrupts::init();
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//println!("{:?}", unsafe { *(0xdeadbeaf as *mut u32) });
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//unsafe { *(0xdeadbeaf as *mut u32) = 42 };
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fn recursive() {
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recursive();
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}
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recursive();
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unsafe { *(0xdeadbeaf as *mut u32) = 42 };
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unsafe {
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asm!("xor eax, eax; idiv eax" :::: "intel");
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}
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println!("It did not crash!");
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loop {}
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}
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fn enable_nxe_bit() {
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use x86::msr::{IA32_EFER, rdmsr, wrmsr};
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let nxe_bit = 1 << 11;
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unsafe {
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let efer = rdmsr(IA32_EFER);
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wrmsr(IA32_EFER, efer | nxe_bit);
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}
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}
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fn enable_write_protect_bit() {
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use x86::controlregs::{cr0, cr0_write};
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let wp_bit = 1 << 16;
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unsafe { cr0_write(cr0() | wp_bit) };
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}
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#[cfg(not(test))]
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#[lang = "eh_personality"]
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extern "C" fn eh_personality() {}
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#[cfg(not(test))]
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#[lang = "panic_fmt"]
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extern "C" fn panic_fmt(fmt: core::fmt::Arguments, file: &str, line: u32) -> ! {
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use vga_buffer::print_error;
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unsafe {
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print_error(format_args!("\n\nPANIC in {} at line {}:", file, line));
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print_error(format_args!(" {}", fmt));
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}
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loop {}
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}
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#[no_mangle]
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pub extern "C" fn _Unwind_Resume() -> ! {
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loop {}
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}
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