---
title: ARMv8
categories: ARM, ARMv8, ARM64, embedded
...
ARMv8架構介紹
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.. image:: http://www.arm.com/zh/images/roadmap/V5_to_V8_Architecture.jpg

Execution state
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- AArch64 - 64-bit Execution state.

 - 提供 31組 64-bit 的通用暫存器
 - 提供 64-bit Program Counter(PC), Stack-Poiner(SP)與Exception-Link-Register (ELR)
 - 定義最多四種(EL0 - EL3)特權模式
 - 支援 64-bit 虛擬地址
 - 定義一組PSTATE來保存PE state

- AArch32 - 32-bit Execution state

 - 提供 16組 32-bit 的通用暫存器
 - 提供 1組 ELR,作為從Hyp-Mode的Exception返回之用
 - 提供 A32(相容ARMv7 ARM)與 T32(相容ARMv7 Thumb)兩種指令集
 - 使用32-bit 虛擬地址
 - 使用單一的CPSR來保存PE state

AArch64 指令集 (instruction set) 介紹
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ARMv8-A_Architecture_Reference_Manual P.111

系統層級架構 (System Level Architecture)
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ARMv8-A_Architecture_Reference_Manual P.1405

例外層級 (Exception levels)
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ARMv8-A_Architecture_Reference_Manual P.1408

虛擬記憶體系統架構 (Virtual Memory System Architecture)
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ARMv8-A_Architecture_Reference_Manual P.1707

通用計時器 (The Generic Timer)
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ARMv8-A_Architecture_Reference_Manual P.1855

reference
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* `ARMv8-A_Architecture_Reference_Manual_(Issue_A.a) (需登入)<http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0487a.e/index.html>`_
* `loda armv8-與-linux的新手筆記<http://loda.hala01.com/2014/12/armv8-%E8%88%87-linux%E7%9A%84%E6%96%B0%E6%89%8B%E7%AD%86%E8%A8%98/>`_