memset64
memset64(vaddr + i, encode, 15);
memset64(vaddr, val, PAGE_SIZE / sizeof(val));
memset64(ring->vaddr + ring->emit, 0, need_wrap / sizeof(u64));
memset64(cs, (u64)MI_NOOP << 32 | MI_NOOP, num_dwords / 2);
return memset64((u64 *)p, (uint64_t)v, n);