【日拱一卒行而不辍20220925】自制操作系统
2024-05-17 00:00:07
下面这段系统联调的代码始终没有调通。需要进一步排查。
在汇编层面，下述代码已经进入了综合的深水区。
; ==========================================
; pmtest1.asm
; 编译方法：nasm pmtest.asm -o pmtest.bin
; ==========================================
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
org 07c00hjmp LABEL_BEGIN
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .s16A]
[BITS 16]
LABEL_BEGIN:xor ax,ax ; 为 DS 置 0 准备mov ds,axmov ah, 0x02;al=1 load sec2;al=2 load sec2-3;al=3 load sec2-4mov al, 5mov ch, 0mov cl, 2mov dh, 0mov bx, sect2mov es, bxxor bx, bxint 0x13jmp sect2:0
data:sect2 equ 0x0588
times 506-($-$$) db 0
dw 0xaa55
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
;sect2:mov ax, csmov ds, ax ; 设置 CS=DS. CS=0x0500, 因此 DS=0x500; 如果变量已经在代码中设置，则要求; 正确地引用其内存地址
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------mov ax, 0xB800mov es, axmov byte [es:(80 * 20 + 0) * 2], '1'mov byte [es:(80 * 20 + 1) * 2], '2'mov byte [es:(80 * 20 + 2) * 2], '3'mov byte [es:(80 * 20 + 3) * 2], '4'mov byte [es:(80 * 20 + 4) * 2], '5'
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
%include "pm.inc" ;PageDirBase0 equ 200000h ; 页目录开始地址: 2M
PageTblBase0 equ 201000h ; 页表开始地址: 2M + 4K
PageDirBase1 equ 210000h ; 页目录开始地址: 2M + 64K
PageTblBase1 equ 211000h ; 页表开始地址: 2M + 64K + 4KLinearAddrDemo equ 00401000h
ProcFoo equ 00401000h
ProcBar equ 00501000h
ProcPagingDemo equ 00301000h
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------mov ax, 0xB800mov es, axmov byte [es:(80 * 21 + 0) * 2], 'a'mov byte [es:(80 * 21 + 1) * 2], 'b'mov byte [es:(80 * 21 + 2) * 2], 'c'mov byte [es:(80 * 21 + 3) * 2], 'd'mov byte [es:(80 * 21 + 4) * 2], 'e'
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .gdt]
; GDT
; 段基址, 段界限 , 属性
LABEL_GDT: Descriptor 0, 0, 0 ; 空描述符
LABEL_DESC_NORMAL: Descriptor 0, 0ffffh, DA_DRW ; Normal 描述符
LABEL_DESC_CODE32: Descriptor 0, SegCode32Len-1, DA_C+DA_32; 非一致代码段,32
LABEL_DESC_CODE16: Descriptor 0, 0ffffh, DA_C ; 非一致代码段,16
LABEL_DESC_CODE_DEST: Descriptor 0,SegCodeDestLen-1, DA_C+DA_32; 非一致代码段,32
LABEL_DESC_DATA: Descriptor 0, DataLen-1, DA_DRW ; Data
LABEL_DESC_STACK: Descriptor 0, TopOfStack, DA_DRWA+DA_32;Stack, 32 位
LABEL_DESC_LDT: Descriptor 0, LDTLen-1, DA_LDT ; LDT
LABEL_DESC_VIDEO: Descriptor 0B8000h, 0ffffh, DA_DRW ; 显存首地址; 门 目标选择子,偏移,DCount, 属性
LABEL_CALL_GATE_TEST: Gate SelectorCodeDest, 0, 0, DA_386CGate+DA_DPL0
;--------------------------------------------------------------------------------------mov ax, 0xB800mov es, axmov byte [es:(80 * 22 + 0) * 2], 'e'mov byte [es:(80 * 22 + 1) * 2], 'n'mov byte [es:(80 * 22 + 2) * 2], 'd'
;--------------------------------------------------------------------------------------
; 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
SelectorNormal equ LABEL_DESC_NORMAL - LABEL_GDT
SelectorCode32 equ LABEL_DESC_CODE32 - LABEL_GDT
SelectorCode16 equ LABEL_DESC_CODE16 - LABEL_GDT
SelectorCodeDest equ LABEL_DESC_CODE_DEST - LABEL_GDT
SelectorData equ LABEL_DESC_DATA - LABEL_GDT
SelectorStack equ LABEL_DESC_STACK - LABEL_GDT
SelectorLDT equ LABEL_DESC_LDT - LABEL_GDT
SelectorVideo equ LABEL_DESC_VIDEO - LABEL_GDTSelectorCallGateTest equ LABEL_CALL_GATE_TEST - LABEL_GDT
; END of [SECTION .gdt];--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .s16B]
[BITS 16];--------------------------------------------------------------------------------------
;-------------------------------------------------------------------------------------- mov ax, csmov ds, axmov es, axmov ss, axmov sp, 0100hmov [LABEL_GO_BACK_TO_REAL+3], axmov [SPValueInRealMode], sp; 初始化 16 位代码段描述符mov ax, csmovzx eax, axshl eax, 4add eax, LABEL_SEG_CODE16mov word [LABEL_DESC_CODE16 + 2], axshr eax, 16mov byte [LABEL_DESC_CODE16 + 4], almov byte [LABEL_DESC_CODE16 + 7], ah; 初始化 32 位代码段描述符xor eax, eaxmov ax, csshl eax, 4add eax, LABEL_SEG_CODE32mov word [LABEL_DESC_CODE32 + 2], axshr eax, 16mov byte [LABEL_DESC_CODE32 + 4], almov byte [LABEL_DESC_CODE32 + 7], ah; 初始化测试调用门的代码段描述符xor eax, eaxmov ax, csshl eax, 4add eax, LABEL_SEG_CODE_DESTmov word [LABEL_DESC_CODE_DEST + 2], axshr eax, 16mov byte [LABEL_DESC_CODE_DEST + 4], almov byte [LABEL_DESC_CODE_DEST + 7], ah; 初始化数据段描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_DATAmov word [LABEL_DESC_DATA + 2], axshr eax, 16mov byte [LABEL_DESC_DATA + 4], almov byte [LABEL_DESC_DATA + 7], ah; 初始化堆栈段描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_STACKmov word [LABEL_DESC_STACK + 2], axshr eax, 16mov byte [LABEL_DESC_STACK + 4], almov byte [LABEL_DESC_STACK + 7], ah; 初始化 LDT 在 GDT 中的描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_LDTmov word [LABEL_DESC_LDT + 2], axshr eax, 16mov byte [LABEL_DESC_LDT + 4], almov byte [LABEL_DESC_LDT + 7], ah; 初始化 LDT 中的描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_CODE_Amov word [LABEL_LDT_DESC_CODEA + 2], axshr eax, 16mov byte [LABEL_LDT_DESC_CODEA + 4], almov byte [LABEL_LDT_DESC_CODEA + 7], ah; 为加载 GDTR 作准备xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_GDT ; eax <- gdt 基地址mov dword [GdtPtr + 2], eax ; [GdtPtr + 2] <- gdt 基地址; 加载 GDTRlgdt [GdtPtr]; 关中断cli; 打开地址线A20in al, 92hor al, 00000010bout 92h, al; 准备切换到保护模式mov eax, cr0or eax, 1mov 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LABEL_REAL_ENTRY: ; 从保护模式跳回到实模式就到了这里mov ax, csmov ds, axmov es, axmov ss, axmov sp, [SPValueInRealMode]in al, 92h ; ┓and al, 11111101b ; ┣ 关闭 A20 地址线out 92h, al ; ┛sti ; 开中断mov ax, 4c00h ; ┓int 21h ; ┛回到 DOS
; END of [SECTION .s16]
; END of [SECTION .s16];--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .data1] ; 数据段
ALIGN 32
[BITS 32]
LABEL_DATA:
SPValueInRealMode dw 0
; 字符串
PMMessage: db "In Protect Mode now. ^-^", 0 ; 进入保护模式后显示此字符串
OffsetPMMessage equ PMMessage - $$
StrTest: db "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 0
OffsetStrTest equ StrTest - $$
DataLen equ $ - LABEL_DATA
; END of [SECTION .data1]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
; 全局堆栈段
[SECTION .gs]
ALIGN 32
[BITS 32]
LABEL_STACK:times 512 db 0TopOfStack equ $ - LABEL_STACK - 1; END of [SECTION .gs]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .s32]; 32 位代码段. 由实模式跳入.
[BITS 32]LABEL_SEG_CODE32:mov ax, SelectorDatamov ds, ax ; 数据段选择子mov ax, SelectorVideomov gs, ax ; 视频段选择子mov ax, SelectorStackmov ss, ax ; 堆栈段选择子mov esp, TopOfStack; 下面显示一个字符串mov ah, 0Ch ; 0000: 黑底 1100: 红字xor esi, esixor edi, edimov esi, OffsetPMMessage ; 源数据偏移mov edi, (80 * 10 + 0) * 2 ; 目的数据偏移。屏幕第 10 行, 第 0 列。cld
.1:lodsbtest al, aljz .2mov [gs:edi], axadd edi, 2jmp .1
.2: ; 显示完毕call DispReturn; 测试调用门（无特权级变换），将打印字母 'C'call SelectorCallGateTest:0;call SelectorCodeDest:0; Load LDTmov ax, SelectorLDTlldt axjmp SelectorLDTCodeA:0 ; 跳入局部任务，将打印字母 'L'。; ------------------------------------------------------------------------
DispReturn:push eaxpush ebxmov eax, edimov bl, 160div bland eax, 0FFhinc eaxmov bl, 160mul blmov edi, eaxpop ebxpop eaxret
; DispReturn 结束
SegCode32Len equ $ - LABEL_SEG_CODE32
; END of [SECTION .s32]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
[SECTION .sdest]; 调用门目标段
[BITS 32]LABEL_SEG_CODE_DEST:;jmp $mov ax, SelectorVideomov gs, ax ; 视频段选择子(目的)mov edi, (80 * 12 + 0) * 2 ; 屏幕第 12 行, 第 0 列。mov ah, 0Ch ; 0000: 黑底 1100: 红字mov al, 'C'mov [gs:edi], axretfSegCodeDestLen equ $ - LABEL_SEG_CODE_DEST
; END of [SECTION .sdest]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
; 16 位代码段. 由 32 位代码段跳入, 跳出后到实模式
[SECTION .s16code]
ALIGN 32
[BITS 16]
LABEL_SEG_CODE16:; 跳回实模式:mov ax, SelectorNormalmov ds, axmov es, axmov fs, axmov gs, axmov ss, axmov eax, cr0and al, 11111110bmov cr0, eaxLABEL_GO_BACK_TO_REAL:jmp 0:LABEL_REAL_ENTRY ; 段地址会在程序开始处被设置成正确的值Code16Len equ $ - LABEL_SEG_CODE16; END of [SECTION .s16code]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
; LDT
[SECTION .ldt]
ALIGN 32
LABEL_LDT:
; 段基址 段界限 , 属性
LABEL_LDT_DESC_CODEA: Descriptor 0, CodeALen - 1, DA_C + DA_32 ; Code, 32 位LDTLen equ $ - LABEL_LDT; LDT 选择子
SelectorLDTCodeA equ LABEL_LDT_DESC_CODEA - LABEL_LDT + SA_TIL
; END of [SECTION .ldt]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
; CodeA (LDT, 32 位代码段)
[SECTION .la]
ALIGN 32
[BITS 32]
LABEL_CODE_A:mov ax, SelectorVideomov gs, ax ; 视频段选择子(目的)mov edi, (80 * 13 + 0) * 2 ; 屏幕第 13 行, 第 0 列。mov ah, 0Ch ; 0000: 黑底 1100: 红字mov al, 'L'mov [gs:edi], axhlt; 准备经由16位代码段跳回实模式jmp SelectorCode16:0
CodeALen equ $ - LABEL_CODE_A
; END of [SECTION .la]
;--------------------------------------------------------------------------------------
;--------------------------------------------------------------------------------------
内存分布如下：
as@as-virtual-machine:~/osdir/chapter3G$ hexdump -Cv boot
00000000 e9 01 00 00 31 c0 8e d8 b4 02 b0 05 b5 00 b1 02 |....1...........|
00000010 b6 00 bb 88 05 8e c3 31 db cd 13 ea 00 00 88 05 |.......1........|
00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000080 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000130 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000140 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000150 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000160 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000170 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000180 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000190 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200 8c c8 8e d8 b8 00 b8 8e c0 26 c6 06 80 0c 31 26 |.........&....1&|
00000210 c6 06 82 0c 32 26 c6 06 84 0c 33 26 c6 06 86 0c |....2&....3&....|
00000220 34 26 c6 06 88 0c 35 b8 00 b8 8e c0 26 c6 06 20 |4&....5.....&.. |
00000230 0d 61 26 c6 06 22 0d 62 26 c6 06 24 0d 63 26 c6 |.a&..".b&..$.c&.|
00000240 06 26 0d 64 26 c6 06 28 0d 65 00 00 00 00 00 00 |.&.d&..(.e......|
00000250 00 00 00 00 ff ff 00 00 00 92 00 00 66 00 00 00 |............f...|
00000260 00 98 40 00 ff ff 00 00 00 98 00 00 13 00 00 00 |..@.............|
00000270 00 98 40 00 35 00 00 00 00 92 00 00 ff 01 00 00 |..@.5...........|
00000280 00 93 40 00 07 00 00 00 00 82 00 00 ff ff 00 80 |..@.............|
00000290 0b 92 00 00 00 00 20 00 00 8c 00 00 b8 00 b8 8e |...... .........|
000002a0 c0 26 c6 06 c0 0d 65 26 c6 06 c2 0d 6e 26 c6 06 |.&....e&....n&..|
000002b0 c4 0d 64 66 00 00 00 00 00 00 00 00 8c c8 8e d8 |..df............|
000002c0 8e c0 8e d0 bc 00 01 a3 d8 82 89 26 00 80 8c c8 |...........&....|
000002d0 66 0f b7 c0 66 c1 e0 04 66 05 c0 82 00 00 a3 66 |f...f...f......f|
000002e0 7e 66 c1 e8 10 a2 68 7e 88 26 6b 7e 66 31 c0 8c |~f....h~.&k~f1..|
000002f0 c8 66 c1 e0 04 66 05 40 82 00 00 a3 5e 7e 66 c1 |.f...f.@....^~f.|
00000300 e8 10 a2 60 7e 88 26 63 7e 66 31 c0 8c c8 66 c1 |...`~.&c~f1...f.|
00000310 e0 04 66 05 a8 82 00 00 a3 6e 7e 66 c1 e8 10 a2 |..f......n~f....|
00000320 70 7e 88 26 73 7e 66 31 c0 8c d8 66 c1 e0 04 66 |p~.&s~f1...f...f|
00000330 05 00 80 00 00 a3 76 7e 66 c1 e8 10 a2 78 7e 88 |......v~f....x~.|
00000340 26 7b 7e 66 31 c0 8c d8 66 c1 e0 04 66 05 40 80 |&{~f1...f...f.@.|
00000350 00 00 a3 7e 7e 66 c1 e8 10 a2 80 7e 88 26 83 7e |...~~f.....~.&.~|
00000360 66 31 c0 8c d8 66 c1 e0 04 66 05 e0 82 00 00 a3 |f1...f...f......|
00000370 86 7e 66 c1 e8 10 a2 88 7e 88 26 8b 7e 66 31 c0 |.~f.....~.&.~f1.|
00000380 8c d8 66 c1 e0 04 66 05 00 83 00 00 a3 e2 82 66 |..f...f........f|
00000390 c1 e8 10 a2 e4 82 88 26 e7 82 66 31 c0 8c d8 66 |.......&..f1...f|
000003a0 c1 e0 04 66 05 4c 7e 00 00 66 a3 b5 7e 0f 01 16 |...f.L~..f..~...|
000003b0 b3 7e fa e4 92 0c 02 e6 92 0f 20 c0 66 83 c8 01 |.~........ .f...|
000003c0 0f 22 c0 66 ea 00 00 00 00 10 00 8c c8 8e d8 8e |.".f............|
000003d0 c0 8e d0 8b 26 00 80 e4 92 24 fd e6 92 fb b8 00 |....&....$......|
000003e0 4c cd 21 00 00 00 00 00 00 00 00 00 00 00 00 00 |L.!.............|
000003f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000400 00 00 49 6e 20 50 72 6f 74 65 63 74 20 4d 6f 64 |..In Protect Mod|
00000410 65 20 6e 6f 77 2e 20 5e 2d 5e 00 41 42 43 44 45 |e now. ^-^.ABCDE|
00000420 46 47 48 49 4a 4b 4c 4d 4e 4f 50 51 52 53 54 55 |FGHIJKLMNOPQRSTU|
00000430 56 57 58 59 5a 00 00 00 00 00 00 00 00 00 00 00 |VWXYZ...........|
00000440 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000450 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000460 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000470 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000480 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000490 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000004f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000500 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000510 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000520 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000530 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000540 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000550 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000560 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000570 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000580 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000590 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000005f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000600 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000610 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000620 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000630 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000640 66 b8 28 00 8e d8 66 b8 40 00 8e e8 66 b8 30 00 |f.(...f.@...f.0.|
00000650 8e d0 bc ff 01 00 00 b4 0c 31 f6 31 ff be 02 00 |.........1.1....|
00000660 00 00 bf 40 06 00 00 fc ac 84 c0 74 09 65 66 89 |...@.......t.ef.|
00000670 07 83 c7 02 eb f2 e8 15 00 00 00 9a 00 00 00 00 |................|
00000680 48 00 66 b8 38 00 0f 00 d0 ea 00 00 00 00 04 00 |H.f.8...........|
00000690 50 53 89 f8 b3 a0 f6 f3 25 ff 00 00 00 40 b3 a0 |PS......%....@..|
000006a0 f6 e3 89 c7 5b 58 c3 00 66 b8 40 00 8e e8 bf 80 |....[X..f.@.....|
000006b0 07 00 00 b4 0c b0 43 65 66 89 07 cb 00 00 00 00 |......Cef.......|
000006c0 b8 08 00 8e d8 8e c0 8e e0 8e e8 8e d0 0f 20 c0 |.............. .|
000006d0 24 fe 0f 22 c0 ea cb 7f 00 00 00 00 00 00 00 00 |$.."............|
000006e0 1a 00 00 00 00 98 40 00 00 00 00 00 00 00 00 00 |......@.........|
000006f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000700 66 b8 40 00 8e e8 bf 20 08 00 00 b4 0c b0 4c 65 |f.@.... ......Le|
00000710 66 89 07 f4 ea 00 00 00 00 18 00 |f..........|
0000071b
运行结果如下
根据运行结果可以看出，是如下代码的执行出现了问题
根据进一步的增加断点
运行结果如下所示
说明LABEL_DESC_NORMAL没有正确生成。
回过头来看，在《Orange S一个操作系统的实现》\chapter3\f\pmtest6.asm中第一次展示了开启分页，是需要着重研读的样本。源码如下：
; ==========================================
; pmtest6.asm
; 编译方法：nasm pmtest6.asm -o pmtest6.com
; ==========================================%include "pm.inc" ; 常量, 宏, 以及一些说明PageDirBase equ 200000h ; 页目录开始地址: 2M
PageTblBase equ 201000h ; 页表开始地址: 2M+4Korg 0100hjmp 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_NORMAL: Descriptor 0, 0ffffh, DA_DRW ; Normal 描述符
LABEL_DESC_PAGE_DIR: Descriptor PageDirBase, 4095, DA_DRW;Page Directory
LABEL_DESC_PAGE_TBL: Descriptor PageTblBase, 1023, DA_DRW|DA_LIMIT_4K;Page Tables
LABEL_DESC_CODE32: Descriptor 0, SegCode32Len-1, DA_C+DA_32 ; 非一致代码段, 32
LABEL_DESC_CODE16: Descriptor 0, 0ffffh, DA_C ; 非一致代码段, 16
LABEL_DESC_DATA: Descriptor 0, DataLen-1, DA_DRW ; Data
LABEL_DESC_STACK: Descriptor 0, TopOfStack, DA_DRWA + DA_32 ; Stack, 32 位
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
SelectorNormal equ LABEL_DESC_NORMAL - LABEL_GDT
SelectorPageDir equ LABEL_DESC_PAGE_DIR - LABEL_GDT
SelectorPageTbl equ LABEL_DESC_PAGE_TBL - LABEL_GDT
SelectorCode32 equ LABEL_DESC_CODE32 - LABEL_GDT
SelectorCode16 equ LABEL_DESC_CODE16 - LABEL_GDT
SelectorData equ LABEL_DESC_DATA - LABEL_GDT
SelectorStack equ LABEL_DESC_STACK - LABEL_GDT
SelectorVideo equ LABEL_DESC_VIDEO - LABEL_GDT
; END of [SECTION .gdt][SECTION .data1] ; 数据段
ALIGN 32
[BITS 32]
LABEL_DATA:
SPValueInRealMode dw 0
; 字符串
PMMessage: db "In Protect Mode now. ^-^", 0 ; 进入保护模式后显示此字符串
OffsetPMMessage equ PMMessage - $$
DataLen equ $ - LABEL_DATA
; END of [SECTION .data1]; 全局堆栈段
[SECTION .gs]
ALIGN 32
[BITS 32]
LABEL_STACK:times 512 db 0TopOfStack equ $ - LABEL_STACK - 1; END of [SECTION .gs][SECTION .s16]
[BITS 16]
LABEL_BEGIN:mov ax, csmov ds, axmov es, axmov ss, axmov sp, 0100hmov [LABEL_GO_BACK_TO_REAL+3], axmov [SPValueInRealMode], sp; 初始化 16 位代码段描述符mov ax, csmovzx eax, axshl eax, 4add eax, LABEL_SEG_CODE16mov word [LABEL_DESC_CODE16 + 2], axshr eax, 16mov byte [LABEL_DESC_CODE16 + 4], almov byte [LABEL_DESC_CODE16 + 7], ah; 初始化 32 位代码段描述符xor eax, eaxmov ax, csshl eax, 4add eax, LABEL_SEG_CODE32mov word [LABEL_DESC_CODE32 + 2], axshr eax, 16mov byte [LABEL_DESC_CODE32 + 4], almov byte [LABEL_DESC_CODE32 + 7], ah; 初始化数据段描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_DATAmov word [LABEL_DESC_DATA + 2], axshr eax, 16mov byte [LABEL_DESC_DATA + 4], almov byte [LABEL_DESC_DATA + 7], ah; 初始化堆栈段描述符xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_STACKmov word [LABEL_DESC_STACK + 2], axshr eax, 16mov byte [LABEL_DESC_STACK + 4], almov byte [LABEL_DESC_STACK + 7], ah; 为加载 GDTR 作准备xor eax, eaxmov ax, dsshl eax, 4add eax, LABEL_GDT ; eax <- gdt 基地址mov dword [GdtPtr + 2], eax ; [GdtPtr + 2] <- gdt 基地址; 加载 GDTRlgdt [GdtPtr]; 关中断cli; 打开地址线A20in al, 92hor al, 00000010bout 92h, al; 准备切换到保护模式mov eax, cr0or eax, 1mov 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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;LABEL_REAL_ENTRY: ; 从保护模式跳回到实模式就到了这里mov ax, csmov ds, axmov es, axmov ss, axmov sp, [SPValueInRealMode]in al, 92h ; ┓and al, 11111101b ; ┣ 关闭 A20 地址线out 92h, al ; ┛sti ; 开中断mov ax, 4c00h ; ┓int 21h ; ┛回到 DOS
; END of [SECTION .s16][SECTION .s32]; 32 位代码段. 由实模式跳入.
[BITS 32]LABEL_SEG_CODE32:call SetupPagingmov ax, SelectorDatamov ds, ax ; 数据段选择子mov ax, SelectorVideomov gs, ax ; 视频段选择子mov ax, SelectorStackmov ss, ax ; 堆栈段选择子mov esp, TopOfStack; 下面显示一个字符串mov ah, 0Ch ; 0000: 黑底 1100: 红字xor esi, esixor edi, edimov esi, OffsetPMMessage ; 源数据偏移mov edi, (80 * 10 + 0) * 2 ; 目的数据偏移。屏幕第 10 行, 第 0 列。cld
.1:lodsbtest al, aljz .2mov [gs:edi], axadd edi, 2jmp .1
.2: ; 显示完毕; 到此停止jmp SelectorCode16:0; 启动分页机制 --------------------------------------------------------------
SetupPaging:; 为简化处理, 所有线性地址对应相等的物理地址.; 首先初始化页目录mov ax, SelectorPageDir ; 此段首地址为 PageDirBasemov es, axmov ecx, 1024 ; 共 1K 个表项xor edi, edixor eax, eaxmov eax, PageTblBase | PG_P | PG_USU | PG_RWW
.1:stosdadd eax, 4096 ; 为了简化, 所有页表在内存中是连续的.loop .1; 再初始化所有页表 (1K 个, 4M 内存空间)mov ax, SelectorPageTbl ; 此段首地址为 PageTblBasemov es, axmov ecx, 1024 * 1024 ; 共 1M 个页表项, 也即有 1M 个页xor edi, edixor eax, eaxmov eax, PG_P | PG_USU | PG_RWW
.2:stosdadd eax, 4096 ; 每一页指向 4K 的空间loop .2mov eax, PageDirBasemov cr3, eaxmov eax, cr0or eax, 80000000hmov cr0, eaxjmp short .3
.3:nopret
; 分页机制启动完毕 ----------------------------------------------------------SegCode32Len equ $ - LABEL_SEG_CODE32
; END of [SECTION .s32]; 16 位代码段. 由 32 位代码段跳入, 跳出后到实模式
[SECTION .s16code]
ALIGN 32
[BITS 16]
LABEL_SEG_CODE16:; 跳回实模式:mov ax, SelectorNormalmov ds, axmov es, axmov fs, axmov gs, axmov ss, axmov eax, cr0and eax, 7FFFFFFEh ; PE=0, PG=0mov cr0, eaxLABEL_GO_BACK_TO_REAL:jmp 0:LABEL_REAL_ENTRY ; 段地址会在程序开始处被设置成正确的值Code16Len equ $ - LABEL_SEG_CODE16; END of [SECTION .s16code]【日拱一卒行而不辍20220925】自制操作系统相关推荐
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