COMPUTING DATA AND INSTRUCTIONS AT IMMUTABLE POINTS
An apparatus comprising a CPU core configured to execute instructions and consume data. The apparatus includes a memory configured to store the instructions and the data. A memory protection shim is coupled to the CPU core and the memory. The memory protection shim is configured to perform transformations over digital blocks to perform at least one of authentication or decryption of the digital blocks received from the memory. The memory protection shim is coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of other external digital blocks between the memory protection shim and the CPU core.
1 . An apparatus comprising:
a CPU core configured to execute instructions and consume data;
a memory configured to store the instructions and the data; and
a memory protection shim coupled to the CPU core and the memory, wherein the memory protection shim is configured to perform transformations over digital blocks to perform at least one of authentication or decryption of the digital blocks received from the memory, and wherein the memory protection shim is coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of other external digital blocks between the memory protection shim and the CPU core.
2 . The apparatus of claim 1 , wherein the memory protection shim is coupled to the CPU core via a bus that logically separates instructions and data.
3 . The apparatus of claim 1 , wherein the memory protection shim is coupled to the CPU core via physically separated instruction and data busses.
4 . The apparatus of claim 1 , wherein the memory protection shim is coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim being coupled directly to a Level 1 cache directly built into the CPU core and to a Level 2 cache external to the CPU core, but included in an integrated fashion with the CPU core.
5 . The apparatus of claim 4 , wherein the CPU core, the memory protection shim, and the Level 2 cache are implemented in an integrated fashion on a same silicon die.
6 . The apparatus of claim 4 , wherein the CPU core, the memory protection shim, and the Level 2 cache are implemented in an integrated fashion in a same semiconductor package.
7 . The apparatus of claim 1 , wherein the memory protection shim is implemented in a package external to a package for the CPU core.
8 . The apparatus of claim 1 , wherein the memory protection shim is coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim being configured to perform the transformations over the digital blocks temporally proximate to when the digital blocks are requested from CPU core.
9 . An apparatus comprising:
a memory protection shim configured to be coupled to a CPU core and memory, wherein the CPU core is configured to execute instructions and consume data and wherein the memory is configured to store the instructions and the data;
wherein the memory protection shim is configured to perform transformations over digital blocks to perform at least one of authentication or decryption of the digital blocks received from the memory; and
wherein the memory protection shim is configured to be coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of other external digital blocks between the memory protection shim and the CPU core.
10 . The apparatus of claim 9 , wherein the memory protection shim is configured to be coupled to the CPU core via a bus that logically separates instructions and data.
11 . The apparatus of claim 9 , wherein the memory protection shim is configured to be coupled to the CPU core via physically separated instruction and data busses.
12 . The apparatus of claim 9 , wherein the memory protection shim is configured to be coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim being configured to be coupled directly to a Level 1 cache directly built into the CPU core and to a Level 2 cache external to the CPU core.
13 . The apparatus of claim 9 , wherein the memory protection shim is implemented in a semiconductor package external to a semiconductor package for the CPU core.
14 . The apparatus of claim 9 , wherein the memory protection shim is configured to be coupled to the CPU core in a fashion that prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim being configured to perform the transformations over the digital blocks temporally proximate to when the digital blocks are requested from CPU core.
15 . A method of consuming data in a secure fashion, the method comprising:
at a memory protection shim coupled to a CPU core configured to execute instructions and consume data and a memory configured to store the instructions and the data, receiving a digital block from the memory;
performing one or more transformations over the digital block to perform at least one of authentication or decryption of the digital blocks received from the memory; and
as a result of authentication or decryption, providing the digital block to the CPU core in a fashion that prevents egress of the digital blocks or ingress of other external digital blocks between the memory protection shim and the CPU core.
16 . The method of claim 15 , wherein the memory protection shim receives the digital block via a bus that logically separates instructions and data.
17 . The method of claim 15 , wherein the memory protection shim receives the digital block via at least one of a physically separated instruction or data bus.
18 . The method of claim 15 , wherein the memory protection shim prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim being coupled directly to a Level 1 cache directly built into the CPU core and to a Level 2 cache external to the CPU core, but included in an integrated fashion with the CPU core.
19 . The method of claim 15 , wherein providing the digital block to the CPU core comprises the memory protection shim providing the digital block from a package external to a package for the CPU core.
20 . The method of claim 15 , wherein the memory protection shim prevents egress of the digital blocks or ingress of the other external digital blocks between the memory protection shim and the CPU core by the memory protection shim performing the transformations over the digital blocks temporally proximate to when the digital blocks are requested from CPU core.