Arm architecture
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three architecture profiles 
==============================

- A-profile (application), 例如手机
- R-profile(Real-time), 例如网络设备、嵌入式控制系统
- M-profile (Microcontroller), 例如IoT

arm按功能打包成不同IP模块卖。。。


核心内容
===========

- Instruction set
- Register set
- Exception model
- Memory model
- Debug, trace, and profiling


核心组成
============

- Debug Port
- Generic Interrupt Controller (GIC)
- DMA
- System Memory Management Unit(SMMU)
- System Controller
- Interconnect
- System Counter
- Generic Timer
- RAM
- Peripheral


Architecture
===============

- SBSA: Server Base System Architecture
- TBSA: Trusted Base System Architecture 
- AMBA: Advanced Microcontroller Bus Architecture

Processing Element (PE): anything that has its own program counter and can execute a program

doc
======
- `Introducing the Arm architecture <https://developer.arm.com/architectures/learn-the-architecture/introducing-the-arm-architecture/single-page>`_
- `Don't We All need ARMs? <https://www.cs.umd.edu/~meesh/cmsc411/website/proj01/arm/home.html>`_
- `ARM Architecture Security Features  <https://www.arm.com/architecture/security-features>`_