MULTIPLE-CORE PROCESSOR WITH HIERARCHICAL MICROCODE STORE
First Claim
1. A processor, comprising:
- a plurality of processor cores, each configured to independently execute instructions defined according to a programmer-visible instruction set architecture (ISA), wherein each of said plurality of processor cores includes a respective local microcode unit configured to store microcode entries; and
a remote microcode unit accessible by each of said processor cores and including a remote microcode store configured to store microcode entries;
wherein any given one of said processor cores is further configured to;
generate a given microcode entrypoint corresponding to a particular microcode entry including one or more operations to be executed by said given processor core;
determine whether said particular microcode entry is stored within said respective local microcode unit of said given processor core; and
in response to determining that said particular microcode entry is not stored within said respective local microcode unit, convey a request for said particular microcode entry to said remote microcode unit.
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Accused Products
Abstract
A multiple-core processor having a hierarchical microcode store. A processor may include multiple processor cores, each configured to independently execute instructions defined according to a programmer-visible instruction set architecture (ISA). Each core may include a respective local microcode unit configured to store microcode entries. The processor may also include a remote microcode unit accessible by each of the processor cores. Any given one of the processor cores may be configured to generate a given microcode entrypoint corresponding to a particular microcode entry including one or more operations to be executed by the given processor core, and to determine whether the particular microcode entry is stored within the respective local microcode unit of the given core. In response to determining that the particular microcode entry is not stored within the respective local microcode unit, the given core may convey a request for the particular microcode entry to the remote microcode unit.
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Citations
20 Claims
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1. A processor, comprising:
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a plurality of processor cores, each configured to independently execute instructions defined according to a programmer-visible instruction set architecture (ISA), wherein each of said plurality of processor cores includes a respective local microcode unit configured to store microcode entries; and a remote microcode unit accessible by each of said processor cores and including a remote microcode store configured to store microcode entries; wherein any given one of said processor cores is further configured to; generate a given microcode entrypoint corresponding to a particular microcode entry including one or more operations to be executed by said given processor core; determine whether said particular microcode entry is stored within said respective local microcode unit of said given processor core; and in response to determining that said particular microcode entry is not stored within said respective local microcode unit, convey a request for said particular microcode entry to said remote microcode unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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a given one of a plurality of processor cores generating a given microcode entrypoint corresponding to a particular microcode entry including one or more operations to be executed by said given processor core, wherein each of said plurality of processor cores is configured to independently execute instructions defined according to a programmer-visible instruction set architecture (ISA), and wherein each of said plurality of processor cores includes a respective local microcode unit configured to store microcode entries; said given processor core determining whether said particular microcode entry is stored within said respective local microcode unit of said given processor core; and in response to determining that said particular microcode entry is not stored within said respective local microcode unit, said given processor core conveying a request for said particular microcode entry to a remote microcode unit, wherein said remote microcode unit is accessible by each of said processor cores and includes a remote microcode store configured to store microcode entries. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A system, comprising:
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a system memory; and a processor coupled to said system memory, wherein said processor comprises; a plurality of processor cores, each configured to independently execute instructions defined according to a programmer-visible instruction set architecture (ISA), wherein each of said plurality of processor cores includes a respective local microcode unit configured to store microcode entries; and a remote microcode unit accessible by each of said processor cores and including a remote microcode store configured to store microcode entries; wherein any given one of said processor cores is further configured to; generate a given microcode entrypoint corresponding to a particular microcode entry including one or more operations to be executed by said given processor core; determine whether said particular microcode entry is stored within said respective local microcode unit of said given processor core; and in response to determining that said particular microcode entry is not stored within said respective local microcode unit, convey a request for said particular microcode entry to said remote microcode unit.
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Specification