Contiguous physical memory from userspace

Question

Is there a way to allocate contiguous physical memory from userspace in linux? At least few guaranteed contiguous memory pages. One huge page isn\'t the answer.

Answer 1

if specific device driver exports dma buffer which is physical contiguous, user space can access through dma buf apis so user task can access but not allocate directly

that is because physically contiguous constraints are not from user aplications but only from device so only device drivers should care.