ARMv8_Architecture英文电子资料.pdfVIP

SoftwareSoftware Systems Systems DesignDesign ARMv8 Technology Preview By Richard Grisenthwaite Lead Architect and Fellow. ARM What is ARMv8?  Next version of the ARM architecture  First release covers the Applications profile only  Addition of a 64-bit operating capability alongside 32-bit execution  AArch64 state alongside AArch32 state  Focus on power efficient architecture advantages in both states  Definition of relationship between AArch32 state and AArch64 state  Enhancement to the AArch32 functionality  Relatively small scale additions reflecting demand  Maintaining full compatibility with ARMv7 ARMv8-A – Context ARMv8 • A-profile only (at this time) • 64-bit architecture support AArch64 - Motivation  Work on 64-bit architecture started in 2007  Fundamental motivation is evolution into 64-bit  Ability to access a large virtual address space  Foresee a future need in ARM’s traditional markets  Enables expansion of ARM market presence  Developing ecosystem takes time  Development started ahead of strong demand  ARM now seeing strong partner interest in 64-bit  Though still some years from “must have” status AArch64 State Fundamentals  New instruction set (A64)  Revised exception handling for exceptions in AArch64 state  Fewer banked registers and modes  Support for all the same architectural capabilities as in ARMv7  TrustZone  Virtualization  Memory translation system based on the ARMv7 LPAE table format  LPAE format was designed to be easily extendable to AArch64-bit  Up to 48 bits of virtual address from a translation table base regis