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ENQCMD

Enqueues a submission entry into a submission queue. It writes a 64-bit value to a memory location and increments the queue tail pointer.

The following table covers what the source and destinations can be.

DO NOT support LOCK

The instruction SHALL only be used in 64-bit mode. It is specifically designed for use with Intel® Data Streaming Accelerator (DSA). The memory operand MUST be aligned to an 8-byte boundary to avoid alignment check exceptions.

The destination memory operand MUST point to a valid DSA submission queue tail pointer. Failure to provide a correctly aligned and mapped memory region WILL result in a general-protection fault (#GP). This instruction is intended for use in a producer-consumer model where the hardware consumes the entries; therefore, software MUST ensure the queue is not full before execution to avoid data loss.