Memory initialization in a protected region

A method comprising:

• executing, by a processor core, an add page instruction to:
• add a target enclave page cache (EPC) page to an enclave;
• and
• set a page type flag of the target EPC page to a pending state;
• executing a single instruction to copy content from a source EPC page in the same enclave to the target EPC page;
• and
• in response to the single instruction,
• copying content of a source EPC page within a same enclave as a target EPC page,
• updating an access permission level of the target EPC page, and
• changing a page type flag of the target EPC page from a pending state to a valid state for use in the enclave.

A system comprising:

• a processor comprising a plurality of functional units to execute instructions;
• and
• a memory device coupled to the processor, wherein the memory device comprises an enclave that includes first enclave page cache (EPC), and wherein the processor is to:
• execute an add page instruction to:
• add a target enclave page cache (EPC) page to an enclave;
• and
• set a page type flag of the target EPC page to a pending state;
• and
• execute a single instruction to copy content from a second EPC page in the same enclave as the first EPC page;
• in response to executing the single instruction,
• copy content of a source EPC page within a same enclave as a target EPC page,
• update an access permission level of the target EPC page, and
• change a page type flag of the target EPC page from a pending state to a valid state for use in the enclave.