PTE2_AP_KR
l2_prot = prot & VM_PROT_WRITE ? PTE2_AP_KRW : PTE2_AP_KR;
l2prot = (prot & VM_PROT_WRITE) ? PTE2_AP_KRW : PTE2_AP_KR;
#define PTE2_KRO(pa) PTE2_KERN(pa, PTE2_AP_KR, PTE2_ATTR_DEFAULT)
PTE2_AP_KR | PTE2_NM, vm_page_pte2_attr(src)));
PTE2_AP_KR | PTE2_NM, vm_page_pte2_attr(a_pg)));