Function palloc

src/allocator/mod.rs:73–110

Allocate pages

(address: u64, size: u64)

// Allocate pages
pub fn palloc(address: u64, size: u64)
{
	let mut mapper = unsafe
	{
		crate::mem::mapper(VirtAddr::new(crate::mem::PMEM_OFFSET))
	};

	let mut framealloc = unsafe
	{
		crate::mem::BootInfoFrameAllocator::init(crate::mem::MEMMAP.unwrap())
	};

	let flags = PageTableFlags::PRESENT | PageTableFlags::WRITABLE | PageTableFlags::USER_ACCESSIBLE;

	let pages =
	{
		let spage = Page::containing_address(VirtAddr::new(address));
		let epage = Page::containing_address(VirtAddr::new(address + size));
		Page::range_inclusive(spage, epage)
	};

	for page in pages
	{
		let frame = framealloc.allocate_frame().unwrap();

		unsafe
		{
			if let Ok(mapping) = mapper.map_to(page, frame, flags, &mut framealloc)
			{
				mapping.flush();
			}
			else
			{
				print!("[ERR] UNABLE TO MAP {:?}", page);
			}
		}
	}
}


// Deallocate pages