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Lad dev #20

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@qqxlt qqxlt commented Jan 22, 2018

Add setup.s instruction

keven2116
keven2116 reviewed Jan 23, 2018
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1.请根据提交规范重新命名文件。
2.标题格式参考已提交的章节。
3.代码注释太多是否考虑加入部分流程图？
4.文中有部分错别字以及语句不通顺的地方，请写完后多阅读几次。
5.内容部分的描述如果有参考，请附上参考链接。

zh-cn/boot/bootsect.md

# bootsect.s 程序

## 1. Linux0.11内核启动过程概述
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标题可以省略 Linux 0.11 ,越精简越好。

zh-cn/boot/bootsect.md
# bootsect.s 程序

## 1. Linux0.11内核启动过程概述
1. 当PC的电源打开后，80x86结构的CPU将进入实模式，并从地址0XFFFF0开始自动执行。
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PC? 是否可以用更加清晰的描述词？

zh-cn/boot/bootsect.md
bootsect.s 是磁盘引导块程序，驻留在磁盘的第一个扇区中（引导扇区，0磁道，0磁头，第一个扇区）。自然 bootsect.s 就是在内存中首先运行的程序。


## 1.1 bootsect.s 程序分析
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标题的 数字标识统一去掉！ 可参考已提交的文档

zh-cn/boot/bootsect.md
56 jmpi go,INITSEG ! 间接跳转。ip指针为go标号的地址(段内偏移地址)，cs=INITSEG=0x9000，
! 这里 INITSEG 指跳转到的段地址。
```
此部分主要实现的功能是将bootsect代码所在的内存0x7c00处，移动到内存0x90000处，每次移动1个字，循环搬移256次，即bootsect代码从内存0x7c00处512字节代码拷贝到内存0x90000处。
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描述不清晰，语句不通顺。

zh-cn/boot/bootsect.md
```

此部分的功能为
- 利用 BIOS 中断 INT 0x13 将 setup 模块从磁盘第2个扇区开始读到0x90200地址(es:bx=0x9000:0x200)开始处，共读4 个扇区。如果读出错，则复位驱动器，并重试，没有退路。
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BIOS 中断？

keven2116
keven2116 reviewed May 17, 2018
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请修正这个提交？

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@qqxlt @keven2116 @yxs314159 @lisongze2016