Table of Contents
1. 寄存器与指令集...............................................................................................................................................................................................................3
1.1 寄存器分类.................................................................................................................................................................................................................3
1.2 寄存器细分.................................................................................................................................................................................................................3
1.2.1 32-bit 通用寄存器组和窗口寄存器组...............................................................................................................................................................3
1.2.2 32-bit 程序计数器 PC.........................................................................................................................................................................................3
1.2.3 特殊寄存器组.....................................................................................................................................................................................................3
1.2.4 32-bit MAC16 数据寄存器................................................................................................................................................................................4
1.3 指令集.........................................................................................................................................................................................................................4
2. 存储管理和保护...............................................................................................................................................................................................................6
2.1 版本.............................................................................................................................................................................................................................6
2.2 MMU 的功能..............................................................................................................................................................................................................6
2.3 地址转换硬件.............................................................................................................................................................................................................6
2.3.1 全部的 TLB.........................................................................................................................................................................................................6
2.4 存储器访问过程（详见 ISA 4.6.2 节）....................................................................................................................................................................7
2.4.1 选择某个 TLB.....................................................................................................................................................................................................8
2.4.2 查找 TLB.............................................................................................................................................................................................................8
2.4.3 检查访问权限.....................................................................................................................................................................................................8
2.4.4 访问片上存储.....................................................................................................................................................................................................8
2.4.5 访问 PIF..............................................................................................................................................................................................................9
2.4.6 访问 cache.........................................................................................................................................................................................................10
2.5 虚拟地址转换为物理地址的过程...........................................................................................................................................................................10
2.6 Memory-Management Model Types.........................................................................................................................................................................11
2.6.1 TLB 中的 AM 字段...........................................................................................................................................................................................11
2.6.2 术语表...............................................................................................................................................................................................................12
3. 中断和异常.....................................................................................................................................................................................................................13
3.1 异常的硬件结构.......................................................................................................................................................................................................13
3.1.1 PS 寄存器..........................................................................................................................................................................................................13
3.1.2 异常的含义.......................................................................................................................................................................................................14
3.1.3 Windowed Code and Xtensa Processor State....................................................................................................................................................14
3.2 中断分类...................................................................................................................................................................................................................14
3.3 异常之窗口异常.......................................................................................................................................................................................................15
3.3.1 窗口上溢异常和窗口下溢异常的原因...........................................................................................................................................................15
3.3.2 栈帧布局...........................................................................................................................................................................................................16
3.3.3 窗口异常处理函数...........................................................................................................................................................................................16
3.4 使能中断...................................................................................................................................................................................................................16
3.5 处理第 1 个中断.......................................................................................................................................................................................................17
3.5.1 栈的设计及用法...............................................................................................................................................................................................17
3.5.2 UserExceptionVector.........................................................................................................................................................................................17
3.5.3 保存当前状态...................................................................................................................................................................................................17
3.5.4 保存用户栈指针...............................................................................................................................................................................................17
3.5.5 移动 Base Save Area.........................................................................................................................................................................................18
3.5.6 更新栈指针.......................................................................................................................................................................................................18
3.5.7 调用 C 中断处理函数.......................................................................................................................................................................................19
3.5.8 从中断返回.......................................................................................................................................................................................................19
3.6 C 中断处理函数.......................................................................................................................................................................................................19
3.7 嵌套中断的处理.......................................................................................................................................................................................................19
3.7.1 设计思路...........................................................................................................................................................................................................19
3.7.2 对中断处理机制的改动...................................................................................................................................................................................19
3.7.3 栈的设计及用法...............................................................................................................................................................................................19
3.7.4 管理中断软件优先级.......................................................................................................................................................................................20
3.7.5 中断分发机制和 kernel 异常...........................................................................................................................................................................21
3.8 对嵌套中断的理解...................................................................................................................................................................................................21
4. 进程切换.........................................................................................................................................................................................................................22
4.1 进程切换机制...........................................................................................................................................................................................................22
4.2 进程切换机制详解...................................................................................................................................................................................................22
4.3 进程切换代码...........................................................................................................................................................................................................23
《Xtensa System Software Reference Manual Basic Runtime(XTOS) and HAL Reference Manual》读后总结............................................................24
《Xtensa Linker Support Packages(LSPs) Reference Manual》读后总结.......................................................................................................................24
1. 开发流程介绍.................................................................................................................................................................................................................24
2. 开发流程举例.................................................................................................................................................................................................................24
3. LSP 结构..........................................................................................................................................................................................................................26
3.1 LSP 的功能...............................................................................................................................................................................................................26
3.2 LSP 的组成...............................................................................................................................................................................................................26
3.3 存储映射文件的语法...............................................................................................................................................................................................26
3.4 xt-genldscripts 和 xt-regenlsps 的命令格式.............................................................................................................................................................26
4. LSP 对编程阶段的影响..................................................................................................................................................................................................26
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