#![allow(unused_imports)]

use flagset::flags;

use core::alloc::{Allocator, Layout};
use spin;
use talc::*;

pub extern crate alloc;

static mut ARENA: [u8; 10000] = [0; 10000];

#[global_allocator]
static ALLOCATOR: Talck<spin::Mutex<()>, ClaimOnOom> = Talc::new(unsafe {
    // if we're in a hosted environment, the Rust runtime may allocate before
    // main() is called, so we need to initialize the arena automatically
    ClaimOnOom::new(Span::from_array(core::ptr::addr_of!(ARENA).cast_mut()))
})
.lock();

#[allow(dead_code)]
pub struct MemoryRegion {
    start_address: usize,
    end_address: usize,
    flags: MemoryRegionFlags,
}

flags! {
    pub enum MemoryRegionFlags: u8 {
        READABLE,
        WRITABLE,
        EXECUTABLE,
    }
}