PDE_SIZE
sva = pdemask + PDE_SIZE - PAGE_SIZE;
batch = pdemask == sva && sva + PDE_SIZE <= eva;
sva = pdemask + PDE_SIZE - PAGE_SIZE;
va = pdemask + PDE_SIZE - PAGE_SIZE;
va = pdemask + PDE_SIZE;
nkpdes = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / PDE_SIZE;
nkpdes += HPPA_IOLEN / PDE_SIZE;
npdes = nkpdes + (physmem + atop(PDE_SIZE) - 1) / atop(PDE_SIZE);
for (va = 0; npdes--; va += PDE_SIZE, addr += PAGE_SIZE) {
if (npdes == HPPA_IOLEN / PDE_SIZE - 1)