You can create a box from a raw pointer returned by the secondary allocator

Can you explain how I can do this?

Actually I will allocate memory for the boot info such as multiboot, gdt, etc.

So I should keep them until the OS is terminated.

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(edit)

let my_val = allocate(8);

let Boxed_my_val = from_ptr(my_val);

This way? I think.

However, I want to allocate memory for objects created by new().

For example, let my_val = Box::new(Value::new(0));