Providing authenticated-exclusive access to shared resources in processor-based devices

A method for providing authenticated-exclusive access to shared resources in processor-based devices, comprising:

• receiving, by an authenticated-exclusive monitor circuit of a processor-based device from a first requestor, an authenticated load exclusive (ALE) request that is directed to an address of a shared resource of the processor-based device and that comprises a first authentication key;
• determining, by the authenticated-exclusive monitor circuit, that the first authentication key is valid;
• responsive to determining that the first authentication key is valid:
• placing, by the authenticated-exclusive monitor circuit, the address of the shared resource in an authenticated tagged state associated with the first requestor;
• and
• transmitting, by the authenticated-exclusive monitor circuit, a return value to the first requestor;
• subsequently receiving, by the authenticated-exclusive monitor circuit from the first requestor, an authenticated store exclusive (ASE) request that is directed to the address of the shared resource and that comprises the first authentication key;
• determining, by the authenticated-exclusive monitor circuit, that the first authentication key is valid;
• and
• responsive to determining that the first authentication key is valid:
• determining, by the authenticated-exclusive monitor circuit, that the address of the shared resource is in the authenticated tagged state associated with the first requestor;
• and
• responsive to determining that the address of the shared resource is in the authenticated tagged state associated with the first requestor:
• acquiring, by the authenticated-exclusive monitor circuit, a lock on the address of the shared resource for the first requestor;
• and
• subsequent to a store operation using the address of the shared resource, placing, by the authenticated-exclusive monitor circuit, the address of the shared resource in an untagged state.

A non-transitory computer-readable medium having stored thereon computer-executable instructions which, when executed by a processor-based device, cause the processor-based device to:

• receive, from a first requestor, an authenticated load exclusive (ALE) request that is directed to an address of a shared resource of the processor-based device and that comprises a first authentication key;
• determine whether the first authentication key is valid;
• and
• responsive to determining that the first authentication key is valid:
• place the address of the shared resource in an authenticated tagged state associated with the first requestor;
• and
• transmit a return value to the first requestor,
• wherein the computer-executable instructions further cause the processor-based device to:
• subsequently receive, from the first requestor, an authenticated store exclusive (ASE) request that is directed to the address of the shared resource and that comprises the first authentication key;
• determine whether the first authentication key is valid;
• and
• responsive to determining that the first authentication key is valid:
• determine whether the address of the shared resource is in the authenticated tagged state associated with the first requestor;
• and
• responsive to determining that the address of the shared resource is in the authenticated tagged state associated with the first requestor:
• acquire a lock on the address of the shared resource for the first requestor;
• and
• subsequent to a store operation using the address of the shared resource, place the address of the shared resource in an untagged state.