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386-5.txt
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Shell api

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386-5.txt：Code Content
  2.                                                     ┌┐┌┐∞
  3. 【 ８０３８６ 保护模式简介五 】                     ┘└┘└┘
  4. ==========================================================================
  5. 前言：
  6.     底下是进入保护模式、进入 V86 的精简范例 ,执行前请确定 CPU 是处在真实模
  7. 式 ,程式码因为用到 386 指令 ,请用 TASM 3.1 来编译。
  8. --------------------------------------------------------------------------
  9. ┌──────┐
  10. │进入保护模式│
  11. └──────┘
  13.     进入保护模式的程式范例 ,其目地是进入保护模式 ,并在保护模式下用绝对记忆
  14. 体读写的方式 ,直接将 'Protection Mode !' 字串写入 Video Ram (B800:0000) ,
  15. 本程式以最精简的方式撰写 ,没有任何错误处理 ,因此请确定电脑现在处在真实模式
  16. 下才可执行本程式。(禁挂 EMM 系保护模式软体)
  18.     程式流程如下：(底下所指记忆体位址皆为 32bit 绝对位址)
  20.         1. 设定 GDTtab 表所在的记忆体位址填入 GDTadds
  22.         2. 设定 Selector 0008 的记忆体起始位址就是现在 CS 的记忆体位址
  23.            设定 Selector 0010 的记忆体起始位址就是现在 CS 的记忆体位址
  24.                 Selector 0018 的记忆体起始位址就是 000B8000 = (B800:0000)
  26.         3. 执行 LGDT FWORD PTR CS:GDTadds 告诉 CPU 一但进入保护模式 ,各
  27.                 区段的记忆体起始位址、长度
  29.         4. 设定 CR0 的 Bit0 = '1' ,并透过 JMP 指令进入保护模式
  30.              ※ 进入保护模式後 ,DS.ES.SS.CS.GS.FS 等等暂存器定址方式不再
  31.                 是 Segment ,而变成 Selector
  33.         5. 秀字 将 0010:MSG_1 搬到 0018:0000
  34.                 意即将 'Protection Mode !' 字串搬到 Video Ram 去
  36.         6. 设定 CR0 的 Bit0 = '0' ,并透过 JMP 指令回到真实模式
  37.              ※ 回到真实模式後 ,DS.ES.SS.CS.GS.FS 等等暂存器定址方式不再
  38.                 是 Selector ,而变成 Segment
  40.         5. 秀字 将 CS:MSG_2 搬到 B800:00A0
  41.                 意即将 'Return Real Mode !' 字串搬到 Video Ram 去
  43.         6. 结束程式
  45. -----------------------------  P.ASM  ------------------------------------
  46. code    segment
  47.         assume  cs:code,ds:code
  48. .386p
  49. start   proc    near
  50.         jmp     next
  51. gdtadds dw      001fh,0000h,0000h
  52. gdttab  db      000h,000h,00h,00h,00h,00h,00h,00h ;00 Null
  53.         db      0ffh,0ffh,00h,00h,00h,9bh,00h,00h ;08 PRG Seg
  54.         db      0ffh,0ffh,00h,00h,00h,93h,00h,00h ;10 PRG Seg
  55.         db      0ffh,0ffh,00h,80h,0bh,93h,00h,00h ;18 B8000
  56. msg_1   db      'Protection Mode !'
  57. msg_2   db      'Return Real Mode !'
  59. next :
  60.         xor     eax,eax                 ;
  61.         xor     ebx,ebx                 ;
  62.         mov     ax,cs                   ;设定 GDTadds
  63.         shl     eax,04h                 ;
  64.         mov     bx,offset gdttab        ;
  65.         add     eax,ebx                 ;
  66.         mov     di,offset gdtadds+02h   ;
  67.         mov     cs:[di],eax             ;
  68.         NOP
  69.         xor     eax,eax                 ;
  70.         xor     ebx,ebx                 ;
  71.         mov     ax,cs                   ;
  72.         shl     eax,04h                 ;
  73.         mov     di,offset gdttab+08h    ;设定 GDTtab 内的
  74.         mov     si,offset gdttab+10h    ;Selector 0008 及 0010
  75.         mov     cs:[di+02h],ax          ;两个段落的记忆体起始位址
  76.         mov     cs:[si+02h],ax          ;
  77.         shr     eax,10h                 ;
  78.         mov     cs:[di+04h],al          ;
  79.         mov     cs:[si+04h],al          ;
  80.         mov     cs:[di+07h],ah          ;
  81.         mov     cs:[si+07h],ah          ;
  82.         NOP
  83.         cli
  84.         lgdt    fword ptr cs:gdtadds    ;载入 GDT 表格
  85.         mov     eax,cr0             ;
  86.         or      al,01h              ;
  87.         mov     cr0,eax             ;
  88.         jmp     protection_mode     ;进入保护模式
  89. protection_mode :                   ;
  90.         mov     ax,0010h                ;
  91.         mov     ds,ax                   ;
  92.         mov     si,offset msg_1         ;
  93.         mov     ax,0018h                ;将 0010:MSG_1 搬到 0018:0000
  94.         mov     es,ax                   ;
  95.         mov     di,0000h                ;
  96.         mov     ah,70h                  ;
  97.         mov     cx,0011h                ;
  98.         cld                             ;
  99. L1 :                                    ;
  100.         lodsb                           ;
  101.         stosw                           ;
  102.         loop    L1                      ;
  103.         NOP
  104.         mov     eax,cr0             ;
  105.         and     al,0feh             ;
  106.         mov     cr0,eax             ;回到真实模式
  107.         jmp     return_real_mode    ;
  108. return_real_mode :                  ;
  109.         sti
  110.         mov     ax,cs                   ;
  111.         mov     ds,ax                   ;
  112.         mov     si,offset msg_2         ;
  113.         mov     ax,0b800h               ;
  114.         mov     es,ax                   ;将 CS:MSG_2 搬到 B800:00A0
  115.         mov     di,00a0h                ;
  116.         mov     ah,70h                  ;
  117.         mov     cx,0012h                ;
  118.         cld                             ;
  119. L2 :                                    ;
  120.         lodsb                           ;
  121.         stosw                           ;
  122.         loop    L2                      ;
  123.         mov     ax,4cffh
  124.         int     21h
  125. start   endp
  126. code    ends
  127.         end     start
  128. --------------------------------------------------------------------------
  129.     因为保护模式下不能呼叫真实模式下的中断 ,所以笔者以直接填写显示卡记忆体
  130. 的方式秀字。这是一个简单、尚未使用中断向量表的范例。
  132. 注: 所谓一山不容二虎 ,如果已载入其它保护模式的程式 ,那本程式将會与它打架 ,
  133.     造成电脑当机。
  144. ┌────────┐
  145. │进入虚拟 86 模式│            为求精简 ,本程式毫无错误处理能力
  146. └────────┘
  147. ------------------------  V86.ASM  ---------------------------------------
  148. code    segment
  149.         assume  cs:code,ds:code
  150. .386p
  151. start   proc    near
  152.         jmp     next
  153. gdtadds dw      002fh,0000h,0000h
  154. gdttab  db      000h,000h,000h,000h,000h,000h,000h,000h ;00 Null
  155.         db      0ffh,0ffh,000h,000h,000h,09bh,000h,000h ;08 PRG Seg
  156.         db      0ffh,0ffh,000h,000h,000h,093h,08fh,000h ;10 Dos=Page
  157.         db      0ffh,0ffh,000h,000h,000h,089h,000h,000h ;18 TSSltr
  158.         db      0ffh,0ffh,000h,000h,000h,089h,000h,000h ;20 TSSjmp
  159.         db      0ffh,003h,000h,000h,000h,093h,000h,000h ;28 Stack (1K)
  161. tssltr  dd      00000000h
  162.         dd      000003ffh       ;ESP
  163.         dw      0028h,0000h     ;SS.0
  164.         dd      0,0,0,0,0
  165.         dw      offset enter_v86,0000h      ;EIP
  166.         dd      00000200h       ;EFlag
  167.         dd      0,0,0,0
  168.         dd      000003ffh       ;ESP
  169.         dd      0,0,0
  170.         dw      0010h,0000h     ;ES.0
  171.         dw      0008h,0000h     ;CS.0
  172.         dw      0028h,0000h     ;SS.0
  173.         dw      0010h,0000h     ;DS,0
  174.         dw      0010h,0000h     ;FS.0
  175.         dw      0010h,0000h     ;GS.0
  176.         dw      0000h,0000h     ;LDT.0
  177.         dw      0000h,0068h     ;0.IOMAP
  178.         dw      0ffffh
  180. tssjmp  dd      00000000h
  181.         dd      000003ffh       ;ESP
  182.         dw      0028h,0000h     ;SS.0
  183.         dd      0,0,0,0,0
  184.         dw      offset enter_v86,0000h      ;EIP
  185.         dd      00000000h       ;EFlag
  186.         dd      0,0,0,0
  187.         dd      000003ffh       ;ESP
  188.         dd      0,0,0
  189.         dw      0010h,0000h     ;ES.0
  190.         dw      0008h,0000h     ;CS.0
  191.         dw      0028h,0000h     ;SS.0
  192.         dw      0010h,0000h     ;DS,0
  193.         dw      0010h,0000h     ;FS.0
  194.         dw      0010h,0000h     ;GS.0
  195.         dw      0000h,0000h     ;LDT.0
  196.         dw      0000h,0068h     ;0.IOMAP
  197. iomap   db      1000h dup (0)
  198.         dw      0ffffh
  200. buffer1 db      0400h dup (0)           ;Stack
  202. idtadds dw      07ffh,0000h,0000h
  203. idttab  dw      offset new_00,0008h,0ee00h,0000h,offset new_01,0008h,0ee00h,0000h
  204.         dw      offset new_02,0008h,0ee00h,0000h,offset new_03,0008h,0ee00h,0000h
  205.         dw      offset new_04,0008h,0ee00h,0000h,offset new_05,0008h,0ee00h,0000h
  206.         dw      offset new_06,0008h,0ee00h,0000h,offset new_07,0008h,0ee00h,0000h
  207.         dw      offset new_08,0008h,0ee00h,0000h,offset new_09,0008h,0ee00h,0000h
  208.         dw      offset new_0a,0008h,0ee00h,0000h,offset new_0b,0008h,0ee00h,0000h
  209.         dw      offset new_0c,0008h,0ee00h,0000h,offset new_0d,0008h,0ee00h,0000h
  210.         dw      offset new_0e,0008h,0ee00h,0000h,offset new_0f,0008h,0ee00h,0000h
  211.         dw      offset new_10,0008h,0ee00h,0000h,offset new_11,0008h,0ee00h,0000h
  212.         dw      offset new_12,0008h,0ee00h,0000h,offset new_13,0008h,0ee00h,0000h
  213.         dw      offset new_14,0008h,0ee00h,0000h,offset new_15,0008h,0ee00h,0000h
  214.         dw      offset new_16,0008h,0ee00h,0000h,offset new_17,0008h,0ee00h,0000h
  215.         dw      offset new_18,0008h,0ee00h,0000h,offset new_19,0008h,0ee00h,0000h
  216.         dw      offset new_1a,0008h,0ee00h,0000h,offset new_1b,0008h,0ee00h,0000h
  217.         dw      offset new_1c,0008h,0ee00h,0000h,offset new_1d,0008h,0ee00h,0000h
  218.         dw      offset new_1e,0008h,0ee00h,0000h,offset new_1f,0008h,0ee00h,0000h
  219.         dw      offset new_20,0008h,0ee00h,0000h,offset new_21,0008h,0ee00h,0000h
  220.         dw      offset new_22,0008h,0ee00h,0000h,offset new_23,0008h,0ee00h,0000h
  221.         dw      offset new_24,0008h,0ee00h,0000h,offset new_25,0008h,0ee00h,0000h
  222.         dw      offset new_26,0008h,0ee00h,0000h,offset new_27,0008h,0ee00h,0000h
  223.         dw      offset new_28,0008h,0ee00h,0000h,offset new_29,0008h,0ee00h,0000h
  224.         dw      offset new_2a,0008h,0ee00h,0000h,offset new_2b,0008h,0ee00h,0000h
  225.         dw      offset new_2c,0008h,0ee00h,0000h,offset new_2d,0008h,0ee00h,0000h
  226.         dw      offset new_2e,0008h,0ee00h,0000h,offset new_2f,0008h,0ee00h,0000h
  227.         dw      offset new_30,0008h,0ee00h,0000h,offset new_31,0008h,0ee00h,0000h
  228.         dw      offset new_32,0008h,0ee00h,0000h,offset new_33,0008h,0ee00h,0000h
  229.         dw      offset new_34,0008h,0ee00h,0000h,offset new_35,0008h,0ee00h,0000h
  230.         dw      offset new_36,0008h,0ee00h,0000h,offset new_37,0008h,0ee00h,0000h
  231.         dw      offset new_38,0008h,0ee00h,0000h,offset new_39,0008h,0ee00h,0000h
  232.         dw      offset new_3a,0008h,0ee00h,0000h,offset new_3b,0008h,0ee00h,0000h
  233.         dw      offset new_3c,0008h,0ee00h,0000h,offset new_3d,0008h,0ee00h,0000h
  234.         dw      offset new_3e,0008h,0ee00h,0000h,offset new_3f,0008h,0ee00h,0000h
  235.         dw      offset new_40,0008h,0ee00h,0000h,offset new_41,0008h,0ee00h,0000h
  236.         dw      offset new_42,0008h,0ee00h,0000h,offset new_43,0008h,0ee00h,0000h
  237.         dw      offset new_44,0008h,0ee00h,0000h,offset new_45,0008h,0ee00h,0000h
  238.         dw      offset new_46,0008h,0ee00h,0000h,offset new_47,0008h,0ee00h,0000h
  239.         dw      offset new_48,0008h,0ee00h,0000h,offset new_49,0008h,0ee00h,0000h
  240.         dw      offset new_4a,0008h,0ee00h,0000h,offset new_4b,0008h,0ee00h,0000h
  241.         dw      offset new_4c,0008h,0ee00h,0000h,offset new_4d,0008h,0ee00h,0000h
  242.         dw      offset new_4e,0008h,0ee00h,0000h,offset new_4f,0008h,0ee00h,0000h
  243.         dw      offset new_50,0008h,0ee00h,0000h,offset new_51,0008h,0ee00h,0000h
  244.         dw      offset new_52,0008h,0ee00h,0000h,offset new_53,0008h,0ee00h,0000h
  245.         dw      offset new_54,0008h,0ee00h,0000h,offset new_55,0008h,0ee00h,0000h
  246.         dw      offset new_56,0008h,0ee00h,0000h,offset new_57,0008h,0ee00h,0000h
  247.         dw      offset new_58,0008h,0ee00h,0000h,offset new_59,0008h,0ee00h,0000h
  248.         dw      offset new_5a,0008h,0ee00h,0000h,offset new_5b,0008h,0ee00h,0000h
  249.         dw      offset new_5c,0008h,0ee00h,0000h,offset new_5d,0008h,0ee00h,0000h
  250.         dw      offset new_5e,0008h,0ee00h,0000h,offset new_5f,0008h,0ee00h,0000h
  251.         dw      offset new_60,0008h,0ee00h,0000h,offset new_61,0008h,0ee00h,0000h
  252.         dw      offset new_62,0008h,0ee00h,0000h,offset new_63,0008h,0ee00h,0000h
  253.         dw      offset new_64,0008h,0ee00h,0000h,offset new_65,0008h,0ee00h,0000h
  254.         dw      offset new_66,0008h,0ee00h,0000h,offset new_67,0008h,0ee00h,0000h
  255.         dw      offset new_68,0008h,0ee00h,0000h,offset new_69,0008h,0ee00h,0000h
  256.         dw      offset new_6a,0008h,0ee00h,0000h,offset new_6b,0008h,0ee00h,0000h
  257.         dw      offset new_6c,0008h,0ee00h,0000h,offset new_6d,0008h,0ee00h,0000h
  258.         dw      offset new_6e,0008h,0ee00h,0000h,offset new_6f,0008h,0ee00h,0000h
  259.         dw      offset new_70,0008h,0ee00h,0000h,offset new_71,0008h,0ee00h,0000h
  260.         dw      offset new_72,0008h,0ee00h,0000h,offset new_73,0008h,0ee00h,0000h
  261.         dw      offset new_74,0008h,0ee00h,0000h,offset new_75,0008h,0ee00h,0000h
  262.         dw      offset new_76,0008h,0ee00h,0000h,offset new_77,0008h,0ee00h,0000h
  263.         dw      offset new_78,0008h,0ee00h,0000h,offset new_79,0008h,0ee00h,0000h
  264.         dw      offset new_7a,0008h,0ee00h,0000h,offset new_7b,0008h,0ee00h,0000h
  265.         dw      offset new_7c,0008h,0ee00h,0000h,offset new_7d,0008h,0ee00h,0000h
  266.         dw      offset new_7e,0008h,0ee00h,0000h,offset new_7f,0008h,0ee00h,0000h
  267.         dw      offset new_80,0008h,0ee00h,0000h,offset new_81,0008h,0ee00h,0000h
  268.         dw      offset new_82,0008h,0ee00h,0000h,offset new_83,0008h,0ee00h,0000h
  269.         dw      offset new_84,0008h,0ee00h,0000h,offset new_85,0008h,0ee00h,0000h
  270.         dw      offset new_86,0008h,0ee00h,0000h,offset new_87,0008h,0ee00h,0000h
  271.         dw      offset new_88,0008h,0ee00h,0000h,offset new_89,0008h,0ee00h,0000h
  272.         dw      offset new_8a,0008h,0ee00h,0000h,offset new_8b,0008h,0ee00h,0000h
  273.         dw      offset new_8c,0008h,0ee00h,0000h,offset new_8d,0008h,0ee00h,0000h
  274.         dw      offset new_8e,0008h,0ee00h,0000h,offset new_8f,0008h,0ee00h,0000h
  275.         dw      offset new_90,0008h,0ee00h,0000h,offset new_91,0008h,0ee00h,0000h
  276.         dw      offset new_92,0008h,0ee00h,0000h,offset new_93,0008h,0ee00h,0000h
  277.         dw      offset new_94,0008h,0ee00h,0000h,offset new_95,0008h,0ee00h,0000h
  278.         dw      offset new_96,0008h,0ee00h,0000h,offset new_97,0008h,0ee00h,0000h
  279.         dw      offset new_98,0008h,0ee00h,0000h,offset new_99,0008h,0ee00h,0000h
  280.         dw      offset new_9a,0008h,0ee00h,0000h,offset new_9b,0008h,0ee00h,0000h
  281.         dw      offset new_9c,0008h,0ee00h,0000h,offset new_9d,0008h,0ee00h,0000h
  282.         dw      offset new_9e,0008h,0ee00h,0000h,offset new_9f,0008h,0ee00h,0000h
  283.         dw      offset new_a0,0008h,0ee00h,0000h,offset new_a1,0008h,0ee00h,0000h
  284.         dw      offset new_a2,0008h,0ee00h,0000h,offset new_a3,0008h,0ee00h,0000h
  285.         dw      offset new_a4,0008h,0ee00h,0000h,offset new_a5,0008h,0ee00h,0000h
  286.         dw      offset new_a6,0008h,0ee00h,0000h,offset new_a7,0008h,0ee00h,0000h
  287.         dw      offset new_a8,0008h,0ee00h,0000h,offset new_a9,0008h,0ee00h,0000h
  288.         dw      offset new_aa,0008h,0ee00h,0000h,offset new_ab,0008h,0ee00h,0000h
  289.         dw      offset new_ac,0008h,0ee00h,0000h,offset new_ad,0008h,0ee00h,0000h
  290.         dw      offset new_ae,0008h,0ee00h,0000h,offset new_af,0008h,0ee00h,0000h
  291.         dw      offset new_b0,0008h,0ee00h,0000h,offset new_b1,0008h,0ee00h,0000h
  292.         dw      offset new_b2,0008h,0ee00h,0000h,offset new_b3,0008h,0ee00h,0000h
  293.         dw      offset new_b4,0008h,0ee00h,0000h,offset new_b5,0008h,0ee00h,0000h
  294.         dw      offset new_b6,0008h,0ee00h,0000h,offset new_b7,0008h,0ee00h,0000h
  295.         dw      offset new_b8,0008h,0ee00h,0000h,offset new_b9,0008h,0ee00h,0000h
  296.         dw      offset new_ba,0008h,0ee00h,0000h,offset new_bb,0008h,0ee00h,0000h
  297.         dw      offset new_bc,0008h,0ee00h,0000h,offset new_bd,0008h,0ee00h,0000h
  298.         dw      offset new_be,0008h,0ee00h,0000h,offset new_bf,0008h,0ee00h,0000h
  299.         dw      offset new_c0,0008h,0ee00h,0000h,offset new_c1,0008h,0ee00h,0000h
  300.         dw      offset new_c2,0008h,0ee00h,0000h,offset new_c3,0008h,0ee00h,0000h
  301.         dw      offset new_c4,0008h,0ee00h,0000h,offset new_c5,0008h,0ee00h,0000h
  302.         dw      offset new_c6,0008h,0ee00h,0000h,offset new_c7,0008h,0ee00h,0000h
  303.         dw      offset new_c8,0008h,0ee00h,0000h,offset new_c9,0008h,0ee00h,0000h
  304.         dw      offset new_ca,0008h,0ee00h,0000h,offset new_cb,0008h,0ee00h,0000h
  305.         dw      offset new_cc,0008h,0ee00h,0000h,offset new_cd,0008h,0ee00h,0000h
  306.         dw      offset new_ce,0008h,0ee00h,0000h,offset new_cf,0008h,0ee00h,0000h
  307.         dw      offset new_d0,0008h,0ee00h,0000h,offset new_d1,0008h,0ee00h,0000h
  308.         dw      offset new_d2,0008h,0ee00h,0000h,offset new_d3,0008h,0ee00h,0000h
  309.         dw      offset new_d4,0008h,0ee00h,0000h,offset new_d5,0008h,0ee00h,0000h
  310.         dw      offset new_d6,0008h,0ee00h,0000h,offset new_d7,0008h,0ee00h,0000h
  311.         dw      offset new_d8,0008h,0ee00h,0000h,offset new_d9,0008h,0ee00h,0000h
  312.         dw      offset new_da,0008h,0ee00h,0000h,offset new_db,0008h,0ee00h,0000h
  313.         dw      offset new_dc,0008h,0ee00h,0000h,offset new_dd,0008h,0ee00h,0000h
  314.         dw      offset new_de,0008h,0ee00h,0000h,offset new_df,0008h,0ee00h,0000h
  315.         dw      offset new_e0,0008h,0ee00h,0000h,offset new_e1,0008h,0ee00h,0000h
  316.         dw      offset new_e2,0008h,0ee00h,0000h,offset new_e3,0008h,0ee00h,0000h
  317.         dw      offset new_e4,0008h,0ee00h,0000h,offset new_e5,0008h,0ee00h,0000h
  318.         dw      offset new_e6,0008h,0ee00h,0000h,offset new_e7,0008h,0ee00h,0000h
  319.         dw      offset new_e8,0008h,0ee00h,0000h,offset new_e9,0008h,0ee00h,0000h
  320.         dw      offset new_ea,0008h,0ee00h,0000h,offset new_eb,0008h,0ee00h,0000h
  321.         dw      offset new_ec,0008h,0ee00h,0000h,offset new_ed,0008h,0ee00h,0000h
  322.         dw      offset new_ee,0008h,0ee00h,0000h,offset new_ef,0008h,0ee00h,0000h
  323.         dw      offset new_f0,0008h,0ee00h,0000h,offset new_f1,0008h,0ee00h,0000h
  324.         dw      offset new_f2,0008h,0ee00h,0000h,offset new_f3,0008h,0ee00h,0000h
  325.         dw      offset new_f4,0008h,0ee00h,0000h,offset new_f5,0008h,0ee00h,0000h
  326.         dw      offset new_f6,0008h,0ee00h,0000h,offset new_f7,0008h,0ee00h,0000h
  327.         dw      offset new_f8,0008h,0ee00h,0000h,offset new_f9,0008h,0ee00h,0000h
  328.         dw      offset new_fa,0008h,0ee00h,0000h,offset new_fb,0008h,0ee00h,0000h
  329.         dw      offset new_fc,0008h,0ee00h,0000h,offset new_fd,0008h,0ee00h,0000h
  330.         dw      offset new_fe,0008h,0ee00h,0000h,offset new_ff,0008h,0ee00h,0000h
  332. new_00 :
  333.         push    0000h
  334.         jmp     int_emu
  335. new_01 :
  336.         push    0001h
  337.         jmp     int_emu
  338. new_02 :
  339.         push    0002h
  340.         jmp     int_emu
  341. new_03 :
  342.         push    0003h
  343.         jmp     int_emu
  344. new_04 :
  345.         push    0004h
  346.         jmp     int_emu
  347. new_05 :
  348.         push    0005h
  349.         jmp     int_emu
  350. new_06 :
  351.         push    0006h
  352.         jmp     int_emu
  353. new_07 :
  354.         push    0007h
  355.         jmp     int_emu
  356. new_08 :
  357.         push    0008h
  358.         jmp     int_emu
  359. new_09 :
  360.         push    0009h
  361.         jmp     int_emu
  362. new_0a :
  363.         push    000ah
  364.         jmp     int_emu
  365. new_0b :
  366.         push    000bh
  367.         jmp     int_emu
  368. new_0c :
  369.         push    000ch
  370.         jmp     int_emu
  371. new_0d :
  372.         push    000dh
  373.         jmp     int_emu
  374. new_0e :
  375.         push    000eh
  376.         jmp     int_emu
  377. new_0f :
  378.         push    000fh
  379.         jmp     int_emu
  380. new_10 :
  381.         push    0010h
  382.         jmp     int_emu
  383. new_11 :
  384.         push    0011h
  385.         jmp     int_emu
  386. new_12 :
  387.         push    0012h
  388.         jmp     int_emu
  389. new_13 :
  390.         push    0013h
  391.         jmp     int_emu
  392. new_14 :
  393.         push    0014h
  394.         jmp     int_emu
  395. new_15 :
  396.         cmp     ah,87h
  397.         jnz     L3
  398.         push    bp
  399.         mov     bp,sp
  400.         add     bp,02h
  401.         push    eax
  402.         push    ebx
  403.         push    ecx
  404.         push    edx
  405.         push    edi
  406.         push    esi
  407.         mov     ebx,ss:[bp+14h]
  408.         shl     ebx,04h
  409.         and     esi,0000ffffh
  410.         add     ebx,esi
  411.         mov     ax,0010h
  412.         mov     ds,ax
  413.         mov     es,ax
  414.         mov     esi,ds:[ebx+12h]
  415.         mov     edi,ds:[ebx+1ah]
  416.         and     esi,00ffffffh
  417.         and     edi,00ffffffh
  418.         or      cx,cx
  419.         jz      L2
  420. L1 :
  421.         mov     ax,ds:[esi]
  422.         mov     es:[edi],ax
  423.         add     esi,02h
  424.         add     edi,02h
  425.         loop    L1
  426. L2 :
  427.         pop     esi
  428.         pop     edi
  429.         pop     edx
  430.         pop     ecx
  431.         pop     ebx
  432.         pop     eax
  433.         pop     bp
  434.         iretd
  435. L3 :
  436.         push    0015h
  437.         jmp     int_emu
  438. new_16 :
  439.         push    0016h
  440.         jmp     int_emu
  441. new_17 :
  442.         push    0017h
  443.         jmp     int_emu
  444. new_18 :
  445.         push    0018h
  446.         jmp     int_emu
  447. new_19 :
  448.         push    0019h
  449.         jmp     int_emu
  450. new_1a :
  451.         push    001ah
  452.         jmp     int_emu
  453. new_1b :
  454.         push    001bh
  455.         jmp     int_emu
  456. new_1c :
  457.         push    001ch
  458.         jmp     int_emu
  459. new_1d :
  460.         push    001dh
  461.         jmp     int_emu
  462. new_1e :
  463.         push    001eh
  464.         jmp     int_emu
  465. new_1f :
  466.         push    001fh
  467.         jmp     int_emu
  468. new_20 :
  469.         push    0020h
  470.         jmp     int_emu
  471. new_21 :
  472.         push    0021h
  473.         jmp     int_emu
  474. new_22 :
  475.         push    0022h
  476.         jmp     int_emu
  477. new_23 :
  478.         push    0023h
  479.         jmp     int_emu
  480. new_24 :
  481.         push    0024h
  482.         jmp     int_emu
  483. new_25 :
  484.         push    0025h
  485.         jmp     int_emu
  486. new_26 :
  487.         push    0026h
  488.         jmp     int_emu
  489. new_27 :
  490.         push    0027h
  491.         jmp     int_emu
  492. new_28 :
  493.         push    0028h
  494.         jmp     int_emu
  495. new_29 :
  496.         push    0029h
  497.         jmp     int_emu
  498. new_2a :
  499.         push    002ah
  500.         jmp     int_emu
  501. new_2b :
  502.         push    002bh
  503.         jmp     int_emu
  504. new_2c :
  505.         push    002ch
  506.         jmp     int_emu
  507. new_2d :
  508.         push    002dh
  509.         jmp     int_emu
  510. new_2e :
  511.         push    002eh
  512.         jmp     int_emu
  513. new_2f :
  514.         push    002fh
  515.         jmp     int_emu
  516. new_30 :
  517.         push    0030h
  518.         jmp     int_emu
  519. new_31 :
  520.         push    0031h
  521.         jmp     int_emu
  522. new_32 :
  523.         push    0032h
  524.         jmp     int_emu
  525. new_33 :
  526.         push    0033h
  527.         jmp     int_emu
  528. new_34 :
  529.         push    0034h
  530.         jmp     int_emu
  531. new_35 :
  532.         push    0035h
  533.         jmp     int_emu
  534. new_36 :
  535.         push    0036h
  536.         jmp     int_emu
  537. new_37 :
  538.         push    0037h
  539.         jmp     int_emu
  540. new_38 :
  541.         push    0038h
  542.         jmp     int_emu
  543. new_39 :
  544.         push    0039h
  545.         jmp     int_emu
  546. new_3a :
  547.         push    003ah
  548.         jmp     int_emu
  549. new_3b :
  550.         push    003bh
  551.         jmp     int_emu
  552. new_3c :
  553.         push    003ch
  554.         jmp     int_emu
  555. new_3d :
  556.         push    003dh
  557.         jmp     int_emu
  558. new_3e :
  559.         push    003eh
  560.         jmp     int_emu
  561. new_3f :
  562.         push    003fh
  563.         jmp     int_emu
  564. new_40 :
  565.         push    0040h
  566.         jmp     int_emu
  567. new_41 :
  568.         push    0041h
  569.         jmp     int_emu
  570. new_42 :
  571.         push    0042h
  572.         jmp     int_emu
  573. new_43 :
  574.         push    0043h
  575.         jmp     int_emu
  576. new_44 :
  577.         push    0044h
  578.         jmp     int_emu
  579. new_45 :
  580.         push    0045h
  581.         jmp     int_emu
  582. new_46 :
  583.         push    0046h
  584.         jmp     int_emu
  585. new_47 :
  586.         push    0047h
  587.         jmp     int_emu
  588. new_48 :
  589.         push    0048h
  590.         jmp     int_emu
  591. new_49 :
  592.         push    0049h
  593.         jmp     int_emu
  594. new_4a :
  595.         push    004ah
  596.         jmp     int_emu
  597. new_4b :
  598.         push    004bh
  599.         jmp     int_emu
  600. new_4c :
  601.         push    004ch
  602.         jmp     int_emu
  603. new_4d :
  604.         push    004dh
  605.         jmp     int_emu
  606. new_4e :
  607.         push    004eh
  608.         jmp     int_emu
  609. new_4f :
  610.         push    004fh
  611.         jmp     int_emu
  612. new_50 :
  613.         push    0050h
  614.         jmp     int_emu
  615. new_51 :
  616.         push    0051h
  617.         jmp     int_emu
  618. new_52 :
  619.         push    0052h
  620.         jmp     int_emu
  621. new_53 :
  622.         push    0053h
  623.         jmp     int_emu
  624. new_54 :
  625.         push    0054h
  626.         jmp     int_emu
  627. new_55 :
  628.         push    0055h
  629.         jmp     int_emu
  630. new_56 :
  631.         push    0056h
  632.         jmp     int_emu
  633. new_57 :
  634.         push    0057h
  635.         jmp     int_emu
  636. new_58 :
  637.         push    0058h
  638.         jmp     int_emu
  639. new_59 :
  640.         push    0059h
  641.         jmp     int_emu
  642. new_5a :
  643.         push    005ah
  644.         jmp     int_emu
  645. new_5b :
  646.         push    005bh
  647.         jmp     int_emu
  648. new_5c :
  649.         push    005ch
  650.         jmp     int_emu
  651. new_5d :
  652.         push    005dh
  653.         jmp     int_emu
  654. new_5e :
  655.         push    005eh
  656.         jmp     int_emu
  657. new_5f :
  658.         push    005fh
  659.         jmp     int_emu
  660. new_60 :
  661.         push    0060h
  662.         jmp     int_emu
  663. new_61 :
  664.         push    0061h
  665.         jmp     int_emu
  666. new_62 :
  667.         push    0062h
  668.         jmp     int_emu
  669. new_63 :
  670.         push    0063h
  671.         jmp     int_emu
  672. new_64 :
  673.         push    0064h
  674.         jmp     int_emu
  675. new_65 :
  676.         push    0065h
  677.         jmp     int_emu
  678. new_66 :
  679.         push    0066h
  680.         jmp     int_emu
  681. new_67 :
  682.         push    0067h
  683.         jmp     int_emu
  684. new_68 :
  685.         push    0068h
  686.         jmp     int_emu
  687. new_69 :
  688.         push    0069h
  689.         jmp     int_emu
  690. new_6a :
  691.         push    006ah
  692.         jmp     int_emu
  693. new_6b :
  694.         push    006bh
  695.         jmp     int_emu
  696. new_6c :
  697.         push    006ch
  698.         jmp     int_emu
  699. new_6d :
  700.         push    006dh
  701.         jmp     int_emu
  702. new_6e :
  703.         push    006eh
  704.         jmp     int_emu
  705. new_6f :
  706.         push    006fh
  707.         jmp     int_emu
  708. new_70 :
  709.         push    0070h
  710.         jmp     int_emu
  711. new_71 :
  712.         push    0071h
  713.         jmp     int_emu
  714. new_72 :
  715.         push    0072h
  716.         jmp     int_emu
  717. new_73 :
  718.         push    0073h
  719.         jmp     int_emu
  720. new_74 :
  721.         push    0074h
  722.         jmp     int_emu
  723. new_75 :
  724.         push    0075h
  725.         jmp     int_emu
  726. new_76 :
  727.         push    0076h
  728.         jmp     int_emu
  729. new_77 :
  730.         push    0077h
  731.         jmp     int_emu
  732. new_78 :
  733.         push    0078h
  734.         jmp     int_emu
  735. new_79 :
  736.         push    0079h
  737.         jmp     int_emu
  738. new_7a :
  739.         push    007ah
  740.         jmp     int_emu
  741. new_7b :
  742.         push    007bh
  743.         jmp     int_emu
  744. new_7c :
  745.         push    007ch
  746.         jmp     int_emu
  747. new_7d :
  748.         push    007dh
  749.         jmp     int_emu
  750. new_7e :
  751.         push    007eh
  752.         jmp     int_emu
  753. new_7f :
  754.         push    007fh
  755.         jmp     int_emu
  756. new_80 :
  757.         push    0080h
  758.         jmp     int_emu
  759. new_81 :
  760.         push    0081h
  761.         jmp     int_emu
  762. new_82 :
  763.         push    0082h
  764.         jmp     int_emu
  765. new_83 :
  766.         push    0083h
  767.         jmp     int_emu
  768. new_84 :
  769.         push    0084h
  770.         jmp     int_emu
  771. new_85 :
  772.         push    0085h
  773.         jmp     int_emu
  774. new_86 :
  775.         push    0086h
  776.         jmp     int_emu
  777. new_87 :
  778.         push    0087h
  779.         jmp     int_emu
  780. new_88 :
  781.         push    0088h
  782.         jmp     int_emu
  783. new_89 :
  784.         push    0089h
  785.         jmp     int_emu
  786. new_8a :
  787.         push    008ah
  788.         jmp     int_emu
  789. new_8b :
  790.         push    008bh
  791.         jmp     int_emu
  792. new_8c :
  793.         push    008ch
  794.         jmp     int_emu
  795. new_8d :
  796.         push    008dh
  797.         jmp     int_emu
  798. new_8e :
  799.         push    008eh
  800.         jmp     int_emu
  801. new_8f :
  802.         push    008fh
  803.         jmp     int_emu
  804. new_90 :
  805.         push    0090h
  806.         jmp     int_emu
  807. new_91 :
  808.         push    0091h
  809.         jmp     int_emu
  810. new_92 :
  811.         push    0092h
  812.         jmp     int_emu
  813. new_93 :
  814.         push    0093h
  815.         jmp     int_emu
  816. new_94 :
  817.         push    0094h
  818.         jmp     int_emu
  819. new_95 :
  820.         push    0095h
  821.         jmp     int_emu
  822. new_96 :
  823.         push    0096h
  824.         jmp     int_emu
  825. new_97 :
  826.         push    0097h
  827.         jmp     int_emu
  828. new_98 :
  829.         push    0098h
  830.         jmp     int_emu
  831. new_99 :
  832.         push    0099h
  833.         jmp     int_emu
  834. new_9a :
  835.         push    009ah
  836.         jmp     int_emu
  837. new_9b :
  838.         push    009bh
  839.         jmp     int_emu
  840. new_9c :
  841.         push    009ch
  842.         jmp     int_emu
  843. new_9d :
  844.         push    009dh
  845.         jmp     int_emu
  846. new_9e :
  847.         push    009eh
  848.         jmp     int_emu
  849. new_9f :
  850.         push    009fh
  851.         jmp     int_emu
  852. new_a0 :
  853.         push    00a0h
  854.         jmp     int_emu
  855. new_a1 :
  856.         push    00a1h
  857.         jmp     int_emu
  858. new_a2 :
  859.         push    00a2h
  860.         jmp     int_emu
  861. new_a3 :
  862.         push    00a3h
  863.         jmp     int_emu
  864. new_a4 :
  865.         push    00a4h
  866.         jmp     int_emu
  867. new_a5 :
  868.         push    00a5h
  869.         jmp     int_emu
  870. new_a6 :
  871.         push    00a6h
  872.         jmp     int_emu
  873. new_a7 :
  874.         push    00a7h
  875.         jmp     int_emu
  876. new_a8 :
  877.         push    00a8h
  878.         jmp     int_emu
  879. new_a9 :
  880.         push    00a9h
  881.         jmp     int_emu
  882. new_aa :
  883.         push    00aah
  884.         jmp     int_emu
  885. new_ab :
  886.         push    00abh
  887.         jmp     int_emu
  888. new_ac :
  889.         push    00ach
  890.         jmp     int_emu
  891. new_ad :
  892.         push    00adh
  893.         jmp     int_emu
  894. new_ae :
  895.         push    00aeh
  896.         jmp     int_emu
  897. new_af :
  898.         push    00afh
  899.         jmp     int_emu
  900. new_b0 :
  901.         push    00b0h
  902.         jmp     int_emu
  903. new_b1 :
  904.         push    00b1h
  905.         jmp     int_emu
  906. new_b2 :
  907.         push    00b2h
  908.         jmp     int_emu
  909. new_b3 :
  910.         push    00b3h
  911.         jmp     int_emu
  912. new_b4 :
  913.         push    00b4h
  914.         jmp     int_emu
  915. new_b5 :
  916.         push    00b5h
  917.         jmp     int_emu
  918. new_b6 :
  919.         push    00b6h
  920.         jmp     int_emu
  921. new_b7 :
  922.         push    00b7h
  923.         jmp     int_emu
  924. new_b8 :
  925.         push    00b8h
  926.         jmp     int_emu
  927. new_b9 :
  928.         push    00b9h
  929.         jmp     int_emu
  930. new_ba :
  931.         push    00bah
  932.         jmp     int_emu
  933. new_bb :
  934.         push    00bbh
  935.         jmp     int_emu
  936. new_bc :
  937.         push    00bch
  938.         jmp     int_emu
  939. new_bd :
  940.         push    00bdh
  941.         jmp     int_emu
  942. new_be :
  943.         push    00beh
  944.         jmp     int_emu
  945. new_bf :
  946.         push    00bfh
  947.         jmp     int_emu
  948. new_c0 :
  949.         push    00c0h
  950.         jmp     int_emu
  951. new_c1 :
  952.         push    00c1h
  953.         jmp     int_emu
  954. new_c2 :
  955.         push    00c2h
  956.         jmp     int_emu
  957. new_c3 :
  958.         push    00c3h
  959.         jmp     int_emu
  960. new_c4 :
  961.         push    00c4h
  962.         jmp     int_emu
  963. new_c5 :
  964.         push    00c5h
  965.         jmp     int_emu
  966. new_c6 :
  967.         push    00c6h
  968.         jmp     int_emu
  969. new_c7 :
  970.         push    00c7h
  971.         jmp     int_emu
  972. new_c8 :
  973.         push    00c8h
  974.         jmp     int_emu
  975. new_c9 :
  976.         push    00c9h
  977.         jmp     int_emu
  978. new_ca :
  979.         push    00cah
  980.         jmp     int_emu
  981. new_cb :
  982.         push    00cbh
  983.         jmp     int_emu
  984. new_cc :
  985.         push    00cch
  986.         jmp     int_emu
  987. new_cd :
  988.         push    00cdh
  989.         jmp     int_emu
  990. new_ce :
  991.         push    00ceh
  992.         jmp     int_emu
  993. new_cf :
  994.         push    00cfh
  995.         jmp     int_emu
  996. new_d0 :
  997.         push    00d0h
  998.         jmp     int_emu
  999. new_d1 :
  1000.         push    00d1h
  1001.         jmp     int_emu
  1002. new_d2 :
  1003.         push    00d2h
  1004.         jmp     int_emu
  1005. new_d3 :
  1006.         push    00d3h
  1007.         jmp     int_emu
  1008. new_d4 :
  1009.         push    00d4h
  1010.         jmp     int_emu
  1011. new_d5 :
  1012.         push    00d5h
  1013.         jmp     int_emu
  1014. new_d6 :
  1015.         push    00d6h
  1016.         jmp     int_emu
  1017. new_d7 :
  1018.         push    00d7h
  1019.         jmp     int_emu
  1020. new_d8 :
  1021.         push    00d8h
  1022.         jmp     int_emu
  1023. new_d9 :
  1024.         push    00d9h
  1025.         jmp     int_emu
  1026. new_da :
  1027.         push    00dah
  1028.         jmp     int_emu
  1029. new_db :
  1030.         push    00dbh
  1031.         jmp     int_emu
  1032. new_dc :
  1033.         push    00dch
  1034.         jmp     int_emu
  1035. new_dd :
  1036.         push    00ddh
  1037.         jmp     int_emu
  1038. new_de :
  1039.         push    00deh
  1040.         jmp     int_emu
  1041. new_df :
  1042.         push    00dfh
  1043.         jmp     int_emu
  1044. new_e0 :
  1045.         push    00e0h
  1046.         jmp     int_emu
  1047. new_e1 :
  1048.         push    00e1h
  1049.         jmp     int_emu
  1050. new_e2 :
  1051.         push    00e2h
  1052.         jmp     int_emu
  1053. new_e3 :
  1054.         push    00e3h
  1055.         jmp     int_emu
  1056. new_e4 :
  1057.         push    00e4h
  1058.         jmp     int_emu
  1059. new_e5 :
  1060.         push    00e5h
  1061.         jmp     int_emu
  1062. new_e6 :
  1063.         push    00e6h
  1064.         jmp     int_emu
  1065. new_e7 :
  1066.         push    00e7h
  1067.         jmp     int_emu
  1068. new_e8 :
  1069.         push    00e8h
  1070.         jmp     int_emu
  1071. new_e9 :
  1072.         push    00e9h
  1073.         jmp     int_emu
  1074. new_ea :
  1075.         push    00eah
  1076.         jmp     int_emu
  1077. new_eb :
  1078.         push    00ebh
  1079.         jmp     int_emu
  1080. new_ec :
  1081.         push    00ech
  1082.         jmp     int_emu
  1083. new_ed :
  1084.         push    00edh
  1085.         jmp     int_emu
  1086. new_ee :
  1087.         push    00eeh
  1088.         jmp     int_emu
  1089. new_ef :
  1090.         push    00efh
  1091.         jmp     int_emu
  1092. new_f0 :
  1093.         push    00f0h
  1094.         jmp     int_emu
  1095. new_f1 :
  1096.         push    00f1h
  1097.         jmp     int_emu
  1098. new_f2 :
  1099.         push    00f2h
  1100.         jmp     int_emu
  1101. new_f3 :
  1102.         push    00f3h
  1103.         jmp     int_emu
  1104. new_f4 :
  1105.         push    00f4h
  1106.         jmp     int_emu
  1107. new_f5 :
  1108.         push    00f5h
  1109.         jmp     int_emu
  1110. new_f6 :
  1111.         push    00f6h
  1112.         jmp     int_emu
  1113. new_f7 :
  1114.         push    00f7h
  1115.         jmp     int_emu
  1116. new_f8 :
  1117.         push    00f8h
  1118.         jmp     int_emu
  1119. new_f9 :
  1120.         push    00f9h
  1121.         jmp     int_emu
  1122. new_fa :
  1123.         push    00fah
  1124.         jmp     int_emu
  1125. new_fb :
  1126.         push    00fbh
  1127.         jmp     int_emu
  1128. new_fc :
  1129.         push    00fch
  1130.         jmp     int_emu
  1131. new_fd :
  1132.         push    00fdh
  1133.         jmp     int_emu
  1134. new_fe :
  1135.         push    00feh
  1136.         jmp     int_emu
  1137. new_ff :
  1138.         push    00ffh
  1139.         jmp     int_emu
  1141. int_emu :
  1142.         push    bp
  1143.         mov     bp,sp
  1144.         add     bp,04h
  1145.         push    eax
  1146.         push    ebx
  1147.        mov     ax,0010h                 ;
  1148.        mov     ds,ax                    ;
  1149.         mov     ax,ss:[bp+0ch]          ;
  1150.         sub     ax,06h                  ;
  1151.         mov     ss:[bp+0ch],ax          ;
  1152.         xor     eax,eax                 ;
  1153.         xor     ebx,ebx                 ;
  1154.         mov     ax,ss:[bp+10h]          ;V86 下 IRET 要返回的位址
  1155.         shl     eax,04h                 ;
  1156.         mov     bx,ss:[bp+0ch]          ;
  1157.         add     ebx,eax                 ;
  1158.         mov     ax,ss:[bp+00h]          ;
  1159.         mov     ds:[ebx],ax             ;
  1160.         mov     ax,ss:[bp+04h]          ;
  1161.         mov     ds:[ebx+02h],ax         ;
  1162.         mov     ax,ss:[bp+08h]          ;
  1163.         mov     ds:[ebx+04h],ax         ;
  1164.         nop
  1165.         xor     ebx,ebx                 ;
  1166.         mov     bx,ss:[bp-02h]          ;
  1167.         shl     ebx,02h                 ;
  1168.         mov     ax,ds:[ebx]             ;IRETD後跳到何处执行
  1169.         mov     ss:[bp+00h],ax          ;(查 0000:0000 的中断表)
  1170.         mov     ax,ds:[ebx+02h]         ;
  1171.         mov     ss:[bp+04h],ax          ;
  1172.         mov     eax,ss:[bp+08h]
  1173.         or      eax,00032000h
  1174.         and     eax,0fffffeffh
  1175.         mov     ss:[bp+08h],eax
  1176.         pop     ebx
  1177.         pop     eax
  1178.         pop     bp
  1179.         add     sp,02h
  1180.         iretd
  1182. set_base :
  1183.         mov     cs:[di+02h],ax
  1184.         shr     eax,0010h
  1185.         mov     cs:[di+04h],al
  1186.         mov     cs:[di+07h],ah
  1187.         ret
  1188. next :
  1189.         xor     eax,eax
  1190.         xor     ebx,ebx
  1191.         mov     ax,cs
  1192.         shl     eax,04h
  1193.         mov     bx,offset gdttab
  1194.         add     eax,ebx
  1195.         mov     di,offset gdtadds+02h
  1196.         mov     cs:[di],eax                     ;设定 gdtadds
  1197.         NOP
  1198.         xor     eax,eax
  1199.         xor     ebx,ebx
  1200.         mov     ax,cs
  1201.         shl     eax,04h
  1202.         mov     di,offset gdttab+08h
  1203.         call    set_base                        ;设定 PRG Seg 的 Base
  1204.         NOP
  1205.         xor     eax,eax
  1206.         xor     ebx,ebx
  1207.         mov     ax,cs
  1208.         shl     eax,04h
  1209.         mov     bx,offset tssltr
  1210.         add     eax,ebx
  1211.         mov     di,offset gdttab+18h
  1212.         call    set_base
  1213.         NOP                                     ;设定 TSSltr 的 Base
  1214.         xor     eax,eax
  1215.         xor     ebx,ebx
  1216.         mov     ax,cs
  1217.         shl     eax,04h
  1218.         mov     bx,offset tssjmp
  1219.         add     eax,ebx
  1220.         mov     di,offset gdttab+20h
  1221.         call    set_base
  1222.         NOP                                     ;设定 TSSjmp 的 Base
  1223.         xor     eax,eax
  1224.         xor     ebx,ebx
  1225.         mov     ax,cs
  1226.         shl     eax,04h
  1227.         mov     bx,offset buffer1
  1228.         add     eax,ebx
  1229.         mov     di,offset gdttab+28h
  1230.         call    set_base
  1231.         NOP                                     ;设定 Stack 的 Base
  1232.         xor     eax,eax
  1233.         xor     ebx,ebx
  1234.         mov     ax,cs
  1235.         shl     eax,04h
  1236.         mov     bx,offset idttab
  1237.         add     eax,ebx
  1238.         mov     di,offset idtadds+02h
  1239.         mov     cs:[di],eax                     ;设定 idtadds
  1240.         NOP
  1241.         cli
  1242.         lgdt    fword ptr cs:gdtadds
  1243.         lidt    fword ptr cs:idtadds
  1244.         mov     eax,cr0
  1245.         or      al,01h
  1246.         mov     cr0,eax
  1247.         mov     bx,0018h
  1248.         ltr     bx
  1249.         db      0eah,00h,00h,20h,00h            ;根據TSS表可知跳到enter_v86
  1250. enter_v86 :
  1251.         mov     ax,0028h
  1252.         mov     es,ax
  1253.         xor     eax,eax
  1254.         mov     ax,code
  1255.         push    eax             ;GS
  1256.         push    eax             ;FS
  1257.         push    eax             ;DS
  1258.         push    eax             ;ES
  1259.         push    eax             ;SS
  1260.         mov     ax,0f000h
  1261.         push    eax             ;ESP
  1262.         mov     eax,00023000h   ;设定VM=1    等级=3
  1263.         push    eax             ;Eflag
  1264.         xor     eax,eax
  1265.         mov     ax,code
  1266.         push    eax             ;CS
  1267.         mov     ax,offset return_dos
  1268.         push    eax             ;EIP
  1269.         clts                    ;将 387 切换成 32 位元模式
  1270.         iretd                   ;回到 V86 (共弹出24h BYTE)
  1271. ;-------------------------------------------------------------------------
  1272. ;  下面的程式便是回到 V86 继续执行的程式
  1273. ;-------------------------------------------------------------------------
  1274. return_dos :
  1275.         sti
  1276.         mov     ax,cs
  1277.         mov     ds,ax
  1278.         mov     dx,offset next
  1279.         add     dx,0200h
  1280.         int     27h
  1281. start   endp
  1282. code    ends
  1283.         end     start
  1284. ;-------------------------------------------------------------------------
  1285.     如何侦测现在是在真实模式下或保护模式呢 ,重点就在於 CR0 暂存器的 Bit0
  1286. 是否为 '1' ,若为 '1' 则表示现在在保护模式 ,反之则为真实模式 ,不过如果要
  1287. 执行 MOV EAX,CR0 这个指令必需要在特权等级才能执行 ,所以您要侦测这个位元的
  1288. 话 ,可以使用 SMSW AX ,来读取 CR0 的低位元部份。
  1291. ┌───────────────────────────────────┐
  1292. │  Soft Bugger 软体蛀虫 90:90/2                    软体新技术的实行者  │
  1293. │  BBS:02-5955461 24HR          ID:Werong Ho               -- 软蛀 --  │
  1294. └───────────────────────────────────┘