// Copyright (c) 2025 shibedrill
// SPDX-License-Identifier: GPL-3.0-or-later

#![allow(unused_imports)]

use enumflags2::*;

use core::alloc::{Allocator, Layout};
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: BitFlags<MemoryRegionFlags>,
}

impl MemoryRegion {
    // TODO: Memory allocation and virtual addressing
    #[allow(unused_variables)]
    pub fn new(flags: BitFlags<MemoryRegionFlags>) -> Self {
        todo!()
    }
}

#[bitflags]
#[repr(u8)]
#[derive(Clone, Copy)]
pub enum MemoryRegionFlags {
    Readable,
    Writable,
    Executable,
}