PG_PDE_PAT
pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT;
pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT;
if ((newpte & PG_PDE_PAT) != 0)
newpte ^= PG_PDE_PAT | PG_PTE_PAT;
newpde ^= PG_PDE_PAT | PG_PTE_PAT;
if ((diff & ~PG_PDE_PAT) == 0 &&
attrs ^= PG_PDE_PAT | PG_PTE_PAT;
#define PG_PDE_CACHE (PG_PDE_PAT | PG_NC_PWT | PG_NC_PCD)