D1 The AArch64 System Level Programmers‘ Model

ARM学习书籍或者思路总结，以XMIND 为形式，构建思维大厦，蛰伏与积累，下面补充对XMIND的描述

D1.1 Exception levels

D1.1.1 Typical Exception level usage model

D1.2.5 Definitions of synchronous and asynchronous exceptions

D1.3 Execution state

• Using AArch64 when execution in that Exception level is in the AArch64 Execution state.
• Using AArch32 when execution in that Exception level is in the AArch32 Execution state.

D1.4 Security state

D1.5 Virtualization

D1.5.1 The effect of implementing EL2 on the Exception model

D1.6 Registers for instruction processing and exception handling

D1.7 Process state, PSTATE

D1.8 Program counter and stack pointer alignment

D1.8.1 PC alignment checking

D1.8.2 SP alignment checking

D1.9 Reset

IRQ(Interrupt Request)：指中断模式。

FIQ(Fast Interrupt Request)：指快速中断模式。

IRQ与FIQ是ARM处理器的两种不同编程模式（ARM有7种处理模式）。

D1.10.4 Exception classes and the ESR_ELx syndrome registers

查具体是什么异常的寄存器