Function alloc_and_map_kernel_heap

pub(crate) fn alloc_and_map_kernel_heap(
    next_available_kernel_address: &mut VAddr,
    kernel_page_table: &mut PageTableImpl,
    boot_info: &mut BootInfo,
)

Allocate memory for the kernel heap, and dynamically map it into the address space after the kernel. We tell the kernel where to find it via the boot info.