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专利名称：Heterogeneous ISA microprocessor that
preserves non-ISA-specific configurationstate when reset to different ISA
发明人：G. Glenn Henry,Terry Parks,Rodney E.
Hooker
申请号：US13412914申请日：20120306公开号：US09146742B2公开日：20150929
专利附图：
摘要：A microprocessor capable of operating as both an x86 ISA and an ARM ISA
microprocessor includes first, second, and third storage that stores x86 ISA-specific, ARMISA-specific, and non-ISA-specific state, respectively. When reset, the microprocessorinitializes the first storage to default values specified by the x86 ISA, initializes the secondstorage to default values specified by the ARM ISA, initializes the third storage topredetermined values, and begins fetching instructions of a first ISA. The first ISA is thex86 ISA or the ARM ISA and a second ISA is the other ISA. The microprocessor updatesthe third storage in response to the first ISA instructions. In response to a subsequentone of the first ISA instructions that instructs the microprocessor to reset to the secondISA, the microprocessor refrains from modifying the non-ISA-specific state stored in thethird storage and begins fetching instructions of the second ISA.
申请人：G. Glenn Henry,Terry Parks,Rodney E. Hooker
地址：Austin TX US,Austin TX US,Austin TX US
国籍：US,US,US
代理人：E. Alan Davis,James W. Huffman,Eric W. Cernyar
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