1.pmtest1.asm ＜Orange's 一个操作系统的实现＞_summersunboy的专栏

; ========================================== ; pmtest1.asm ; 编译方法：nasm pmtest1.asm -o pmtest1.bin ; ========================================== %include "pm.inc" ; 常量, 宏, 以及一些说明 %define _BOOT_DEBUG_ %ifdef _BOOT_DEBUG_ org 0100h %else org 07c00h jmp LABEL_BEGIN [SECTION .gdt] ; GDT ; 段基址, 段界限 , 属性 LABEL_GDT: Descriptor 0, 0, 0 ; 空描述符 LABEL_DESC_CODE32: Descriptor 0, SegCode32Len - 1, DA_C + DA_32; 非一致代码段 LABEL_DESC_VIDEO: Descriptor 0B8000h, 0ffffh, DA_DRW ; 显存首地址 ; GDT 结束 GdtLen equ $ - LABEL_GDT ; GDT长度 GdtPtr dw GdtLen - 1 ; GDT界限 dd 0 ; GDT基地址 ; GDT 选择子 SelectorCode32 equ LABEL_DESC_CODE32 - LABEL_GDT SelectorVideo equ LABEL_DESC_VIDEO - LABEL_GDT ; END of [SECTION .gdt] [SECTION .s16] [BITS 16] LABEL_BEGIN: mov ax, cs mov ds, ax mov es, ax mov ss, ax mov sp, 0100h ; 初始化 32 位代码段描述符,填充LABEL_DESC_CODE32的段基址（第2，3，4，7这四个字节） xor eax, eax mov ax, cs shl eax, 4 add eax, LABEL_SEG_CODE32 mov word [LABEL_DESC_CODE32 + 2], ax shr eax, 16 mov byte [LABEL_DESC_CODE32 + 4], al mov byte [LABEL_DESC_CODE32 + 7], ah ; 为加载 GDTR 作准备 (0,1两字节为表长度，2，3，4，5为32位线性基地址） xor eax, eax mov ax, ds shl eax, 4 add eax, LABEL_GDT ; eax <- gdt 基地址 mov dword [GdtPtr + 2], eax ; [GdtPtr + 2] <- gdt 基地址（2，3，4，5四字节线性基地址） ; 加载 GDTR lgdt [GdtPtr] ; 关中断 cli ; 打开地址线A20 in al, 92h or al, 00000010b out 92h, al ; 准备切换到保护模式 mov eax, cr0 or eax, 1 mov cr0, eax ; 真正进入保护模式 jmp dword SelectorCode32:0 ; 执行这一句会把 SelectorCode32 装入 cs, ; 并跳转到 Code32Selector:0 处 ; END of [SECTION .s16] [SECTION .s32]; 32 位代码段. 由实模式跳入. [BITS 32] LABEL_SEG_CODE32: mov ax, SelectorVideo mov gs, ax ; 视频段选择子(目的) mov edi, (80 * 11 + 79) * 2 ; 屏幕第 11 行, 第 79 列。 mov ah, 0Ch ; 0000: 黑底 1100: 红字 mov al, 'P' mov [gs:edi], ax ; 到此停止 jmp $ SegCode32Len equ $ - LABEL_SEG_CODE32 ; END of [SECTION .s32] 注：（以下问题先这么理解着，不对以后再改）：关于为什么没有初始化GDT中显存段的描述符的问题： LABEL_DESC_VIDEO:Descriptor 0B8000h,0ffffh,DA_DRW 段基址段界限属性都在Descriptor宏中定义过了不需要初始化。 LABEL_DESC_CODE32:Descriptor 0,SegCode32Len-1,DA_C+DA_32 其段基址为0，即没有初始化，所以需要初始化 ; 初始化 32 位代码段描述符 xor eax, eax mov ax, cs shl eax, 4 add eax, LABEL_SEG_CODE32 mov word [LABEL_DESC_CODE32 + 2], ax shr eax, 16 mov byte [LABEL_DESC_CODE32 + 4], al mov byte [LABEL_DESC_CODE32 + 7], ah 这一段的作用也就是填充 32 位代码段描述符LABEL_DESC_CODE32的段基址（第2，3，4，7这四个字节）当然如果觉得理解起来比较麻烦也要以直接赋值（如果己知的话），linux 0.11内核中setup.s中就是这么做的; ========================================== ; </span></p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" 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