US 8,555,013 B1Granted

Method and system for memory protection by processor carrier based access control

AssigneeOracle America, Inc.

InventorsChristopher A. Vick, Michael H. Paleczny, Jay R. Freeman, Olaf Manczak, Phyllis E. Gustafson, Yuguang Wu

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Abstract

A method for memory protection in a multiprocessor system, involving receiving a request at a first carrier to perform a memory operation at a memory address, wherein the first carrier receives the request from a processor, determining by the first carrier whether the processor is permitted to access memory at the memory address using a carrier identification (ID) of a second carrier, wherein the second carrier is associated with a memory controller used to access the memory, and sending the request to the second carrier, if the processor is permitted to access the memory.

Claims19

Dependent claims

A method for memory protection in a multiprocessor system, comprising:

receiving, by a first processor carrier directly from a first processor of a plurality of processors of the multiprocessor system, a first request to perform a first memory operation at a first memory address in a first specific region of a random access memory,
wherein the first processor carrier is associated with the first processor and the random access memory is shared memory of the plurality of processors in the multiprocessor system, and
wherein the first processor is located on a first processor die and the first processor carrier is directly connected to the first processor;
determining by the first processor carrier whether the first processor is permitted to access the random access memory at the first memory address using a first carrier identification (ID) of a first memory carrier, wherein the first memory carrier is associated with a first memory controller used to access the first specific region of the random access memory;
receiving, by a second processor carrier directly from a second processor of the plurality of processors, a second request at a second processor carrier to perform a second memory operation at a second memory address in a second specific region of the random access memory,
wherein the second processor carrier is associated with the second processor, and
wherein the second processor is located on a second processor die and the second processor carrier is directly connected to the second processor;
determining, by the second processor carrier, whether the second processor is permitted to access the random access memory at the second memory address using a second carrier ID of a second memory carrier, wherein the second memory carrier is associated with a second memory controller used to access the second specific region of the random access memory;
sending the first request to the first memory carrier when the first processor is permitted to access the first specific region of the random access memory at the first memory address;
and
sending the second request to the second memory carrier when the second processor is permitted to access the second specific region of the random access memory at the second memory address,
wherein the first processor carrier is operatively connected to each of the first memory carrier, the second processor carrier, and the second memory carrier, and
wherein the first memory carrier is operatively connected to each of the second processor carrier and the second memory carrier.

10 more elements

A multiprocessor system, comprising:

a random access memory;
a first memory controller operatively connected to the random access memory and used to access a first specific region of the random access memory;
a second memory controller operatively connected to the random access memory and used to access a second specific region of the random access memory;
a first processor configured to request access to a first memory address in the first specific region of the random access memory to perform a first memory operation, wherein the first processor is one of a plurality of processors,
wherein the first processor is located on a first processor die, and
wherein the random access memory is shared memory of the plurality of processors in the multiprocessor system;
a second processor configured to request access to a second memory address in the second specific region of the random access memory to perform a second memory operation, wherein the second processor is one of the plurality of processors, and wherein the second processor is located on a second processor die;
a first memory carrier associated with the first memory controller, wherein the first memory carrier comprises a first carrier identification (ID);
a first processor carrier associated with the first processor and configured to:
receive a first request to access the first memory address directly from the first processor, and
determine whether the first processor is permitted to access the first specific region of the random access memory at the first memory address using the first carrier ID, wherein the first processor carrier is directly connected to the first processor;
and
a second processor carrier associated with the second processor and configured to:
receive a second request to access the second memory address directly from the second processor, and
determine whether the second processor is permitted to access the second specific region of the random access memory at the second memory address using a second carrier ID, wherein the second processor carrier is directly connected to the second processor,
a second memory carrier associated with the second memory controller, wherein the second memory carrier comprises the second carrier ID;
wherein the first memory carrier is operatively connected to each of the first processor carrier, the second processor carrier, and the second memory carrier, and
wherein the first processor carrier is operatively connected to each of the second processor carrier and the second memory carrier.

15 more elements

Dependencies are inferred from the claim text.