vm_phys_early_add_seg
vm_phys_early_add_seg((vm_paddr_t)kernphys, trunc_page(first));
vm_phys_early_add_seg(KPTphys, KPTphys + ptoa(nkpt));
vm_phys_early_add_seg((vm_paddr_t)KERNLOAD, trunc_page(first));
void vm_phys_early_add_seg(vm_paddr_t start, vm_paddr_t end);