{"id":388,"date":"2023-07-26T13:45:11","date_gmt":"2023-07-26T05:45:11","guid":{"rendered":"https:\/\/blog.taiyang.space\/?p=388"},"modified":"2023-07-26T13:45:12","modified_gmt":"2023-07-26T05:45:12","slug":"l2-%e5%af%b9gdt%e5%92%8cldt%e7%9a%84%e7%90%86%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/blog.taiyang.space\/?p=388","title":{"rendered":"L2-\u5bf9GDT\u548cLDT\u7684\u7406\u89e3"},"content":{"rendered":"

1\u3001\u5185\u5b58\u5bfb\u5740<\/h2>\n

1.1 \u5b9e\u6a21\u5f0f\u4e0b\u7684\u5185\u5b58\u5bfb\u5740<\/h3>\n

\u5b9e\u6a21\u5f0f\uff08\u4e5f\u5c31\u662f 8086 \u7684\u6a21\u5f0f\uff09\u4e0b\u7684\u5bfb\u5740\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n

\u6bb5\u9996\u5730\u5740 x 16 + \u504f\u79fb\u91cf = \u7269\u7406\u5730\u5740\uff1b\u5373cs<<4+ip<\/code><\/p><\/blockquote>\n

\u4e58\u4ee5 16 \u662f\u56e0\u4e3a\u5728 8086 CPU\u4e2d\uff0c\u5730\u5740\u7ebf\u662f20\u4f4d\uff0c\u4f46\u5bc4\u5b58\u5668\u662f16\u4f4d\u7684\uff08\u6216\u8005\u8bf4\u7528\u6765\u5bfb\u5740\u7684\u6bb5\u5bc4\u5b58\u5668\u53ea\u670916\u4f4d\uff09\uff0c\u6700\u9ad8\u5bfb\u574064KB\uff0c\u5b83\u65e0\u6cd5\u5bfb\u5740\u52301M\u5185\u5b58\u3002\u4e8e\u662f\uff0cIntel \u8bbe\u8ba1\u4e86\u8fd9\u79cd\u5bfb\u5740\u65b9\u5f0f\uff0c\u8fd9\u4e5f\u9020\u6210\u4e86\u6bb5\u7684\u9996\u5730\u5740\u5fc5\u987b\u662f16\u7684\u500d\u6570\u7684\u9650\u5236\u3002<\/p>\n

1.2 \u4fdd\u62a4\u6a21\u5f0f\u4e0b\u5206\u6bb5\u673a\u5236\u7684\u5185\u5b58\u5bfb\u5740<\/h3>\n

\u4fdd\u62a4\u6a21\u5f0f\u548c\u5b9e\u6a21\u5f0f\u7684\u5bfb\u5740\u65b9\u5f0f\u6709\u7740\u5f88\u5927\u7684\u4e0d\u540c\u3002\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u5185\u5b58\u5bfb\u5740\u7684\u65b9\u5f0f\u4e3a\uff1a\u5229\u7528\u6bb5\u9009\u62e9\u5b50\uff08\u901a\u5e38\u60c5\u51b5\u4e0b\u4e5f\u5c31\u662f\u5b9e\u6a21\u5f0f\u4e0b\u7684\u6bb5\u5bc4\u5b58\u5668\uff1acs\u3001ds\u7b49\uff09\u4ece\u6bb5\u63cf\u8ff0\u7b26\u8868\uff08GDT\u3001LDT\u90fd\u662f\u6bb5\u63cf\u8ff0\u7b26\u8868\uff09\u4e2d\u627e\u5230\u5bf9\u5e94\u7684\u6bb5\u63cf\u8ff0\u7b26\uff0c\u56e0\u4e3a\u6bb5\u63cf\u8ff0\u7b26\u4e2d\u542b\u6709\u9700\u8981\u5bfb\u5740\u7684\u6bb5\u57fa\u5730\u5740\u3001\u6bb5\u957f\u5ea6\uff0c\u6bb5\u5c5e\u6027\u7b49\u4fe1\u606f\uff0c\u6240\u4ee5\u5229\u7528\u901a\u8fc7\u6bb5\u9009\u62e9\u5b50\u627e\u5230\u7684\u6bb5\u63cf\u8ff0\u7b26\u548c\u504f\u79fb\u91cf\u5c31\u53ef\u4ee5\u5bfb\u5740\u5230\u5bf9\u5e94\u7684\u5185\u5b58\u5730\u5740\u3002\u5728\u672a\u5f00\u542f\u5206\u9875\u673a\u5236\u7684\u60c5\u51b5\u4e0b\uff0c\u6b64\u65f6\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u7684\u5bfb\u5740\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n

\u6bb5\u63cf\u8ff0\u7b26\u4e2d\u7684\u57fa\u5730\u5740 + \u504f\u79fb\u91cf = \u7269\u7406\u5730\u5740<\/p><\/blockquote>\n

\u8fd9\u4e00\u6bb5\u8bdd\uff0c\u51fa\u73b0\u4e86\u4e09\u4e2a\u65b0\u540d\u8bcd\uff1a\u6bb5\u9009\u62e9\u5b50\u3001\u6bb5\u63cf\u8ff0\u7b26\u8868\u3001\u6bb5\u63cf\u8ff0\u7b26<\/p>\n

\u53ef\u4ee5\u5148\u7b80\u5355\u7406\u89e3\uff1a\u6bb5\u63cf\u8ff0\u7b26\u8868 \u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u90fd\u662f\u4e00\u4e2a \u6bb5\u63cf\u8ff0\u7b26\uff0c\u6bb5\u9009\u62e9\u5b50 \u4f5c\u4e3a \u6bb5\u63cf\u8ff0\u7b26\u8868 \u7684\u7d22\u5f15\uff0c\u5176\u5b9e \u6bb5\u9009\u62e9\u5b50 \u5c31\u662f\u6570\u7ec4\u7684\u4e0b\u6807\u3002<\/strong><\/p>\n

\u8bf4\u4eba\u8bdd\uff1a<\/p>\n

    \n
  • \u6bb5\u63cf\u8ff0\u7b26\u8868\uff1a\u6570\u7ec4<\/li>\n
  • \u6bb5\u63cf\u8ff0\u7b26\uff1a\u6570\u7ec4\u5143\u7d20<\/li>\n
  • \u6bb5\u9009\u62e9\u5b50\uff1a\u6570\u7ec4\u4e0b\u6807<\/li>\n<\/ul>\n

    \u6211\u4eec\u518d\u770b\u4e00\u4e0b\u5b9e\u6a21\u5f0f\u4e0b\u548c\u4fdd\u62a4\u6a21\u5f0f\u4e0b \uff0c\u4e0b\u9762\u4e24\u6761\u6c47\u7f16\u6307\u4ee4\u7684\u533a\u522b\uff08\u4e0b\u9762\u4e24\u53e5\u4ee3\u7801\u90fd\u6765\u81ea Linux0.11 \uff09\uff1a<\/p>\n

    jmpi go, INITSEG ! \u8be5\u6307\u4ee4\u5728\u5b9e\u6a21\u5f0f\u4e0b\u6267\u884c, go\u662f\u4e2a\u6c47\u7f16\u6807\u53f7\uff0c\u662f\u504f\u79fb\u5730\u5740\uff0cINITSEG \u662f\u6bb5\u57fa\u5730\u5740\uff08\u5728mov\u6307\u4ee4\u4e2d\u6bb5\u57fa\u5730\u5740\n                 ! \u901a\u5e38\u662fcs\u3001ds\u7b49\uff09\u3002\u6240\u4ee5\u8be5\u6307\u4ee4\u8981\u8df3\u8f6c INITSEG << 4 + go \u5730\u5740\u53bb\u6267\u884c\u3002\n                 \njmpi 0, 8        ! \u8be5\u6307\u4ee4\u5728\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u6267\u884c\uff0c0 \u4e3a\u504f\u79fb\u5730\u5740\uff0c8 \u4e3a\u6bb5\u9009\u62e9\u5b50\uff08\u5728mov\u6307\u4ee4\u4e2d\u6bb5\u9009\u62e9\u5b50\u901a\u5e38\u662fcs\u3001ds\u7b49\uff09\u3002\n                 ! \u6240\u4ee5\u8be5\u6307\u4ee4\u5229\u7528 8 \u627e\u5230\u5bf9\u5e94\u7684\u6bb5\u63cf\u8ff0\u7b26\uff0c\u5728\u5229\u7528\u6bb5\u63cf\u8ff0\u7b26\u4e2d\u7684\u6bb5\u57fa\u5730\u5740 + \u504f\u79fb\u5730\u5740\u627e\u5230\u5bf9\u5e94\u7684\u7269\u7406\u5730\u5740\u3002\n<\/code><\/pre>\n
    2\u3001\u4ec0\u4e48\u662fGDT<\/h2>\n
    GDT \u5c31\u662f\u6bb5\u63cf\u8ff0\u7b26\u8868\u7684\u4e00\u79cd\u3002GDT \u5168\u540d\u662f(Global Describe Table)\u5168\u5c40\u63cf\u8ff0\u7b26\u8868<\/strong>\uff0c\u5b58\u653e\u5728\u5185\u5b58\u4e2d\uff08GDT\u53ef\u4ee5\u88ab\u653e\u5728\u5185\u5b58\u7684\u4efb\u4f55\u4f4d\u7f6e\uff09\uff0c\u53ea\u6709\u4e00\u5f20\u4e14\u5168\u5c40\u53ef\u89c1\u3002\u7ecf\u8fc7\u4e0a\u4e00\u8282\u7684\u5206\u6790\uff0cGDT \u5c31\u662f\u4e00\u4e2a\u6bb5\u63cf\u8ff0\u7b26\u7c7b\u578b\u7684\u6570\u7ec4\u3002\u5f62\u8c61\u70b9\u8868\u793a\u7684\u8bdd\uff0c\u5982\u4e0b\uff1a<\/p>\n
    \/\/ Discriptor\u5c31\u662f\u6bb5\u63cf\u8ff0\u7b26\uff0c\u8be5\u7ed3\u6784\u4f53\u5927\u5c0f\u4e3a 64 bit\nstruct Discriptor {\n    elemType Base;        \/\/ \u6bb5\u7269\u7406\u9996\u5730\u5740\n    elemType Limit;       \/\/ \u6bb5\u754c\u9650\n    elemType Access;      \/\/ \u6bb5\u5c5e\u6027\n};\n\/\/ discriptorTable[n] \u5c31\u662f\u63cf\u8ff0\u7b26\u8868(GDT)\nstruct Discriptor  discriptorTable[n] = {...};\n<\/code><\/pre>\n
    \u6bb5\u63cf\u8ff0\u7b26 \u670964\u4f4d\uff0c\u6bb5\u63cf\u8ff0\u7b26\u7684\u5b9e\u9645\u7ed3\u6784\u5982\u4e0b\uff08\u5176\u5b9e\u6bb5\u63cf\u8ff0\u7b26\u4e0d\u662f\u4e0a\u9762\u8bf4\u7684\u90a3\u4e2a\u7ed3\u6784\u4f53\uff0c\u4e0d\u8fc7\u5185\u5bb9\u4e5f\u6ca1\u4ec0\u4e48\u533a\u522b\u3002\u53e6\u5916\u6bb5\u63cf\u8ff0\u7b26\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u4e48\u5947\u602a\uff0c\u597d\u50cf\u662f\u4e3a\u4e86\u517c\u5bb9\u4e4b\u524d\u7684\u67b6\u6784\uff09\uff1a<\/p>\n
    \"img\"<\/p>\n
    \u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa \u6bb5\u63cf\u8ff0\u7b26\u8868 \u4e2d\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u4fe1\u606f\u2014\u2014\u6bb5\u57fa\u5730\u5740\u3002\u5173\u4e8e \u6bb5\u5c5e\u6027 \u53ef\u4ee5\u7b80\u5355\u4e86\u89e3\u4e00\u4e0b\uff1a<\/p>\n
      \n
    1. G:<\/li>\n
    2. \n
        \n
      1. G=0\u65f6\uff0c\u6bb5\u9650\u957f\u768420\u4f4d\u4e3a\u5b9e\u9645\u6bb5\u9650\u957f\uff0c\u6700\u5927\u9650\u957f\u4e3a2^20=1MB<\/li>\n
      2. G=1\u65f6\uff0c\u5219\u5b9e\u9645\u6bb5\u9650\u957f\u4e3a20\u4f4d\u6bb5\u9650\u957f\u4e58\u4ee52^12=4KB\uff0c\u6700\u5927\u9650\u957f\u8fbe\u52304GB<\/li>\n<\/ol>\n<\/li>\n
      3. DPL\uff1a\u7279\u6743\u7ea7\uff0c0\u4e3a\u6700\u9ad8\u7279\u6743\u7ea7\uff0c3\u4e3a\u6700\u4f4e\uff0c\u8868\u793a\u8bbf\u95ee\u8be5\u6bb5\u65f6CPU\u6240\u9700\u5904\u4e8e\u7684\u6700\u4f4e\u7279\u6743\u7ea7\u3002\uff08 \u533a\u522b\u4e00\u4e0bCPL\uff1aCPL\u662f\u5f53\u524d\u8fdb\u7a0b\u7684\u6743\u9650\u7ea7\u522b(Current Privilege Level)\uff0c\u662f\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u4ee3\u7801\u6240\u5728\u7684\u6bb5\u7684\u7279\u6743\u7ea7\uff0c\u5b58\u5728\u4e8ecs\u5bc4\u5b58\u5668\u7684\u4f4e\u4e24\u4f4d\u3002\uff09<\/li>\n<\/ol>\n
        3\u3001\u4ec0\u4e48\u662fLDT<\/h2>\n
        LDT \u7684\u5168\u79f0\u662f\u5c40\u90e8\u6bb5\u63cf\u8ff0\u7b26\u8868\u3002LDT \u7684\u7ed3\u6784\u4e0e GDT \u7c7b\u4f3c\uff0c\u4e5f\u5b58\u653e\u5728\u5185\u5b58\u4e2d\uff0c\u4e0eGDT\u4e0d\u540c\u7684\u662f\uff0cLDT\u5728\u7cfb\u7edf\u4e2d\u53ef\u4ee5\u5b58\u5728\u591a\u4e2a\uff08\u5f53\u7136LDT\u4e5f\u53ef\u4ee5\u6ca1\u6709\uff09\uff0c\u5e76\u4e14\u4eceLDT\u7684\u540d\u5b57\u53ef\u4ee5\u5f97\u77e5\uff0cLDT\u4e0d\u662f\u5168\u5c40\u53ef\u89c1\u7684\uff0c\u5b83\u4eec\u53ea\u5bf9\u5f15\u7528\u5b83\u4eec\u7684\u4efb\u52a1\u53ef\u89c1\uff0c\u6bcf\u4e2a\u4efb\u52a1\u6700\u591a\u53ef\u4ee5\u62e5\u6709\u4e00\u4e2aLDT\u3002\u53e6\u5916\uff0c\u6bcf\u4e00\u4e2aLDT\u81ea\u8eab\u4f5c\u4e3a\u4e00\u4e2a\u6bb5\u5b58\u5728\uff0c\u5b83\u4eec\u7684\u6bb5\u63cf\u8ff0\u7b26\u88ab\u653e\u5728GDT\u4e2d\u3002<\/p>\n
        IA-32 \u4e3a LDT \u7684\u5165\u53e3\u5730\u5740\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5bc4\u5b58\u5668 LDTR\uff0c\u56e0\u4e3a\u5728\u4efb\u4f55\u65f6\u523b\u53ea\u80fd\u6709\u4e00\u4e2a\u4efb\u52a1\uff08\u6216\u8005\u8bf4\u8fdb\u7a0b\uff09\u5728\u8fd0\u884c\uff0c\u6240\u4ee5 LDT \u5bc4\u5b58\u5668\u5168\u5c40\u4e5f\u53ea\u9700\u8981\u6709\u4e00\u4e2a\u3002\u5982\u679c\u6bcf\u4e2a\u4efb\u52a1\u90fd\u62e5\u6709\u81ea\u8eab\u7684 LDT\uff0c\u90a3\u4e48\u5728\u5207\u6362\u5230\u4e0b\u4e00\u4e2a\u4efb\u52a1\u7684\u65f6\u5019\uff0c\u5c31\u8981\u4fee\u6539 LDTR \uff0c\u8ba9 LDTR \u6307\u5411\u4e0b\u4e00\u4e2a\u4efb\u52a1\u7684 LDT\u3002\u4fee\u6539\u65b9\u5f0f\u5c31\u662f\u901a\u8fc7 LLDT \u6307\u4ee4\u5c06\u4e0b\u4e00\u4e2a\u4efb\u52a1\u7684 LDT \u7684 \u6bb5\u63cf\u8ff0\u7b26\u7684\u7d22\u5f15\uff08\u4e5f\u5c31\u662f\u6bb5\u9009\u62e9\u5b50\uff09\u88c5\u5165\u6b64\u5bc4\u5b58\u5668\u3002<\/p>\n
        \"img\"<\/p>\n
        LLDT \u6307\u4ee4\u4e0e LGDT \u6307\u4ee4\u4e0d\u540c\uff1a<\/p>\n
          \n
        • LGDT \u6307\u4ee4\u7684\u64cd\u4f5c\u6570\u662f\u4e00\u4e2a 32-bit \u7684\u5185\u5b58\u5730\u5740\uff0c\u8fd9\u4e2a\u5185\u5b58\u5730\u5740\u6307\u5411\u4e00\u4e2a48bit\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u8fd9\u4e2a\u5185\u5b58\u7a7a\u95f4\u91cc\u5b58\u653e\u4e86 32-bit GDT \u7684\u5165\u53e3\u5730\u5740\uff0c\u4ee5\u53ca 16-bit \u7684GDT Limit\u3002LGDT \u6307\u4ee4\u4f1a\u5c06\u8fd948bit\u5185\u5bb9\u52a0\u8f7d\u5230 GDTR\u4e2d\u3002<\/li>\n
        • LLDT \u6307\u4ee4\u7684\u64cd\u4f5c\u6570\u662f\u4e00\u4e2a16-bit\u7684 \u9009\u62e9\u5b50\uff0c\u8fd9\u4e2a\u9009\u62e9\u5b50\u4e3b\u8981\u5185\u5bb9\u662f\uff1a\u88ab\u88c5\u5165\u7684 LDT \u7684\u6bb5\u63cf\u8ff0\u7b26\u5728 GDT \u4e2d\u7684\u7d22\u5f15\u503c\u3002LLDT \u6307\u4ee4\u4f1a\u5c06\u8fd9\u4e2a16-bit\u7684 \u9009\u62e9\u5b50\u52a0\u8f7d\u5230 LDTR \u4e2d\u3002<\/li>\n<\/ul>\n
          4\u3001\u6bb5\u9009\u62e9\u5b50<\/h2>\n
          \u539f\u5148\u5b9e\u6a21\u5f0f<\/strong>\u4e0b\u7684\u5404\u4e2a\u6bb5\u5bc4\u5b58\u5668\u4f5c\u4e3a\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u7684\u6bb5\u9009\u62e9\u5b50\uff08\u4e5f\u53ef\u4ee5\u79f0\u4e3a\u6bb5\u9009\u62e9\u5668\u3001\u6bb5\u9009\u62e9\u7b26\uff09\uff0c80486\u4e2d\u67096\u4e2a(\u5373CS,SS,DS,ES,FS,GS)16\u4f4d\u7684\u6bb5\u5bc4\u5b58\u5668\u3002\u6bb5\u9009\u62e9\u5b50 CS \u5bf9\u5e94\u8868\u793a\u7684\u6bb5\u4ecd\u4e3a\u4ee3\u7801\u6bb5\uff0cSS \u5bf9\u5e94\u8868\u793a\u7684\u6bb5\u4ecd\u4e3a\u5806\u6808\u6bb5\u3002\u5f53\u7136\u6bb5\u9009\u62e9\u5b50\u4e5f\u4e0d\u90fd\u662f\u6bb5\u5bc4\u5b58\u5668\uff0c\u800c\u662f\u6839\u636e\u5177\u4f53\u7684\u6c47\u7f16\u6307\u4ee4\u800c\u5b9a\uff0c\u5c31\u50cf\u7b2c1\u8282\u4e2d\u7684\u90a3\u4e2a jmpi \u6307\u4ee4\uff0c\u9009\u62e9\u5b50\u5c31\u662f\u4e00\u4e2a\u5e38\u6570\u3002<\/strong><\/p>\n
          \u6bb5\u9009\u62e9\u5b50\u5927\u5c0f\u4e3a 16bit\u3002\u6bb5\u9009\u62e9\u5b50\u5305\u62ec\u4e09\u90e8\u5206\uff1a\u63cf\u8ff0\u7b26\u7d22\u5f15\uff08index\uff09\u3001TI\u3001\u8bf7\u6c42\u7279\u6743\u7ea7\uff08RPL\uff09\u3002<\/p>\n
          \"img\"<\/p>\n
          \uff08\u56fe5.1\u5b58\u5728\u4e00\u4e9b\u9519\u8bef\uff1a\u6bb5\u9009\u62e9\u5b50\u7684\u5927\u5c0f\u5e94\u8be5\u662f0~15 \u5171 16bit\uff0c\u5176\u4e2d RPL \u4e3a bit0 – bit1\u3001TI \u4e3a bit2\u3001Index \u4e3a bit3 – bit15\uff09<\/p>\n
            \n
          • Index\uff08\u63cf\u8ff0\u7b26\u7d22\u5f15\uff09\u90e8\u5206\u8868\u793a\u6240\u9700\u8981\u7684\u6bb5\u63cf\u8ff0\u7b26\u5728\u63cf\u8ff0\u7b26\u8868\u7684\u4f4d\u7f6e\uff08\u5982Index = 1\uff0c\u8868\u793a\u6bb5\u63cf\u8ff0\u7b26\u8868\u7684\u7b2c1\u9879\u6bb5\u63cf\u8ff0\u7b26\uff09\uff0c\u7531\u8fd9\u4e2a\u4f4d\u7f6e\u518d\u6839\u636e\u5728 GDTR \u4e2d\u5b58\u50a8\u7684\u63cf\u8ff0\u7b26\u8868\u57fa\u5740\u5c31\u53ef\u4ee5\u627e\u5230\u76f8\u5e94\u7684\u63cf\u8ff0\u7b26\u3002\u7136\u540e\u7528\u63cf\u8ff0\u7b26\u8868\u4e2d\u7684\u6bb5\u57fa\u5740\u52a0\u4e0a\u903b\u8f91\u5730\u5740\uff08SEL:OFFSET\uff09\u7684OFFSET\u5c31\u53ef\u4ee5\u8f6c\u6362\u6210\u7ebf\u6027\u5730\u5740\u3002<\/li>\n
          • TI \u503c\u53ea\u6709\u4e00\u4f4d0\u62161\uff0c0\u4ee3\u8868\u9009\u62e9\u5b50\u662f\u5728 GDT \u4e2d\u7d22\u5f15\uff0c1\u4ee3\u8868\u9009\u62e9\u5b50\u662f\u5728 LDT \u4e2d\u7d22\u5f15\u3002<\/strong><\/li>\n
          • \u8bf7\u6c42\u7279\u6743\u7ea7\uff08RPL\uff09\u5219\u4ee3\u8868\u9009\u62e9\u5b50\u7684\u7279\u6743\u7ea7\uff0c\u5171\u67094\u4e2a\u7279\u6743\u7ea7\uff080\u7ea7\u30011\u7ea7\u30012\u7ea7\u30013\u7ea7\uff09\u3002<\/li>\n<\/ul>\n
            5\u3001\u5173\u4e8e\u7279\u6743\u7ea7\u7684\u8bf4\u660e<\/h2>\n
            \u4efb\u52a1\u4e2d\u7684\u6bcf\u4e00\u4e2a\u6bb5\u90fd\u6709\u4e00\u4e2a\u7279\u5b9a\u7684\u7ea7\u522b\u3002\u6bcf\u5f53\u4e00\u4e2a\u7a0b\u5e8f\u8bd5\u56fe\u8bbf\u95ee\u67d0\u4e00\u4e2a\u6bb5\u65f6\uff0c\u5c31\u5c06\u8be5\u7a0b\u5e8f\u6240\u62e5\u6709\u7684\u7279\u6743\u7ea7\u4e0e\u8981\u8bbf\u95ee\u7684\u7279\u6743\u7ea7\u8fdb\u884c\u6bd4\u8f83\uff0c\u4ee5\u51b3\u5b9a\u80fd\u5426\u8bbf\u95ee\u8be5\u6bb5\u3002\u7cfb\u7edf\u7ea6\u5b9a\uff0cCPU\u53ea\u80fd\u8bbf\u95ee\u540c\u4e00\u7279\u6743\u7ea7\u6216\u7ea7\u522b\u8f83\u4f4e\u7279\u6743\u7ea7\u7684\u6bb5\u3002<\/p>\n
            Linux0.11\u4e2d\u53ea\u662f\u7528\u4e862\u4e2a\u7279\u6743\u7ea7\uff1a0\u7ea7\u548c3\u7ea7\uff0c\u5176\u4e2d\u64cd\u4f5c\u7cfb\u7edf\u7684\u5185\u6838\u533a\u4e3a0\u7ea7\uff0c\u7528\u6237\u533a\u4e3a3\u7ea7\u3002\u7279\u6743\u7ea7\u67093\u79cd\u7c7b\u578b\uff1aCPL\u3001DPL\u548cRPL\u3002<\/p>\n
              \n
            • CPL\u4e3a\u5f53\u524d\u7279\u6743\u7ea7<\/strong>\uff0c\u8868\u793a\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u7a0b\u5e8f\u7684\u7279\u6743\u7ea7\uff0c\u5b58\u653e\u5728cs\u548css\u5bc4\u5b58\u5668\u4e2d\u3002int\u6307\u4ee4\u53ef\u4ee5\u5c06 CPL \u6539\u4e3a0<\/li>\n
            • DPL\u4e3a\u63cf\u8ff0\u7b26\u7279\u6743\u7ea7\uff0c\u8868\u793a\u8981\u8bbf\u95ee\u7684\u6bb5\u6216\u95e8\u7684\u7279\u6743\u7ea7\uff08\u76ee\u6807\u7279\u6743\u7ea7<\/strong>\uff09\u3002DPL\u5b58\u653e\u5728\u6bb5\u63cf\u8ff0\u7b26\u6216\u95e8\u63cf\u7b26\u4e2d\u3002<\/li>\n
            • RPL\u4e3a\u8bf7\u6c42\u7279\u6743\u7ea7<\/strong>\uff0c\u5b58\u653e\u5728\u6bb5\u9009\u62e9\u5b50\uff08\u5982ds\uff0ccs\u7b49\u6bb5\u5bc4\u5b58\u5668\uff0c\u4e0d\u8fc7RPL\u901a\u5e38\u88ab\u7528\u5728ds\u4e2d\uff09\u4e2d\u3002\u82e5\u8fd9\u4e2a\u6bb5\u9009\u62e9\u5b50\u662f cs\uff0c\u90a3\u4e48\u6b64\u65f6RPL \u5c31\u7b49\u4e8e CPL \uff08\u56e0\u4e3aCPL\u53ea\u5b58\u653e\u5728 cs \u4e2d\uff09\u3002<\/li>\n<\/ul>\n
              \u5f53\u7a0b\u5e8f\u8bbf\u95ee\u4e00\u4e2a\u6bb5\u65f6\uff0c\u5904\u7406\u5668\u4f1a\u68c0\u67e5CPL\u3001DPL\u548cRPL\uff0c \u53ea\u6709\u5f53 DPL>= CPL \u4e14 DPL>= RPL \u65f6\u5904\u7406\u5668\u624d\u4f1a\u5141\u8bb8\u7a0b\u5e8f\u8bbf\u95ee\u8be5\u6bb5<\/strong>\u3002\u4f8b\u5982 CPL = 3\uff0cRPL = 3\uff0c DPL = 0 \u65f6\u7a0b\u5e8f\u8bbf\u95ee\u7684\u8bf7\u6c42\u65f6\u4e0d\u88ab\u5141\u8bb8\u7684\u3002<\/p>\n
              6\u3001\u518d\u770b\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u5206\u6bb5\u673a\u5236\u7684\u5185\u5b58\u5bfb\u5740<\/h2>\n
              6.1 \u8bbf\u95eeGDT<\/h3>\n
              \"img\"<\/p>\n
              \u5f53TI = 0<\/strong>\u65f6\u8868\u793a\u6bb5\u63cf\u8ff0\u7b26\u5728 GDT \u4e2d\uff0c\u5982\u4e0a\u56fe\u6240\u793a\uff1a<\/p>\n
                \n
              1. \u5148\u4ece GDTR \u5bc4\u5b58\u5668\u4e2d\u83b7\u5f97 GDT \u57fa\u5740\uff1b<\/li>\n
              2. \u7136\u540e\u518d\u6839\u636e\u6bb5\u9009\u62e9\u5b50\uff08\u6bb5\u9009\u62e9\u5668\uff09\u9ad813\u4f4d\u7684\u4f4d\u7f6e\u7d22\u5f15\u503c\u5f97\u5230\u6bb5\u63cf\u8ff0\u7b26\uff1b<\/li>\n
              3. \u6bb5\u63cf\u8ff0\u7b26\u7b26\u5305\u542b\u6bb5\u7684\u57fa\u5740\u3001\u9650\u957f\u3001\u4f18\u5148\u7ea7\u7b49\u5404\u79cd\u5c5e\u6027\uff0c\u8fd9\u5c31\u5f97\u5230\u4e86\u6bb5\u7684\u8d77\u59cb\u5730\u5740\uff08\u57fa\u5740\uff09\uff0c\u518d\u4ee5\u57fa\u5740\u52a0\u4e0a\u504f\u79fb\u5730\u5740\uff1b<\/li>\n<\/ol>\n
                6.2 \u8bbf\u95eeLDT<\/h3>\n
                \"img\"<\/p>\n
                \u5f53 TI = 1 \u65f6\u8868\u793a\u6bb5\u63cf\u8ff0\u7b26\u5728 LDT \u4e2d\uff0c\u5982\u4e0a\u56fe\u6240\u793a\uff1a<\/p>\n
                  \n
                1. \u8fd8\u662f\u5148\u4ece GDTR \u5bc4\u5b58\u5668\u4e2d\u83b7\u5f97 GDT \u57fa\u5740\uff1b<\/li>\n
                2. \u4ece LDTR \u5bc4\u5b58\u5668\u4e2d\u83b7\u53d6 LDT \u6240\u5728\u6bb5\u7684\u4f4d\u7f6e\u7d22\u5f15 (LDTR\u9ad813\u4f4d)\uff0c\u6b64\u65f6 LDTR \u53ef\u4ee5\u770b\u6210\u4e00\u4e2a\u6bb5\u9009\u62e9\u5b50\uff1b<\/li>\n
                3. \u901a\u8fc7\u8fd9\u4e2a\u4f4d\u7f6e\u7d22\u5f15 (LDTR\u9ad813\u4f4d)\uff0c\u5728 GDT \u4e2d\u5f97\u5230 LDT \u7684\u6bb5\u63cf\u8ff0\u7b26\u4ece\u800c\u5f97\u5230 LDT \u6bb5\u57fa\u5740\uff1b<\/li>\n
                4. \u5229\u7528\u6bb5\u9009\u62e9\u5b50\uff08\u6bb5\u9009\u62e9\u5668\uff09\u9ad813\u4f4d\u4f4d\u7f6e\u7d22\u5f15\u503c\u4ece LDT \u6bb5\u4e2d\u5f97\u5230\u9700\u8981\u8bbf\u95ee\u7684\u5185\u5b58\u7684\u6bb5\u63cf\u8ff0\u7b26\uff1b<\/li>\n
                5. \u6bb5\u63cf\u8ff0\u7b26\u7b26\u5305\u542b\u6bb5\u7684\u57fa\u5740\u3001\u9650\u957f\u3001\u4f18\u5148\u7ea7\u7b49\u5404\u79cd\u5c5e\u6027\uff0c\u8fd9\u5c31\u5f97\u5230\u4e86\u6bb5\u7684\u8d77\u59cb\u5730\u5740\uff08\u57fa\u5740\uff09\uff0c\u518d\u4ee5\u57fa\u5740\u52a0\u4e0a\u504f\u79fb\u5730\u5740 yyyyyyyy \u5f97\u5230\u6700\u540e\u7684\u7ebf\u6027\u5730\u5740\uff1b<\/li>\n<\/ol>\n
                  7\u3001\u603b\u7ed3<\/h3>\n
                  \u5176\u5b9eGDT\u53ea\u662f\u4e00\u4e2a\u6bb5\u63cf\u8ff0\u7b26\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5b83\u4e3b\u8981\u662f\u7528\u4e8e\u5185\u5b58\u5bfb\u627e\u3002\u4e3a\u4e86\u5bf9\u90e8\u5206\u5185\u5b58\u533a\u57df\uff08\u5b58\u653e\u7740\u6838\u5fc3\u6570\u636e\uff09\u8fdb\u884c\u4fdd\u62a4\uff0c\u56e0\u6b64\u5c06\u6bb5\u63cf\u8ff0\u7b26\u8bbe\u8ba1\u6210\u4e86\u4e09\u90e8\u4efd\u3002\u800cLDT\u7684\u7ed3\u6784\u548cGDT\u7c7b\u4f3c\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3GDT\u548cLDT\uff1aGDT\u4e3a\u4e00\u7ea7\u63cf\u8ff0\u7b26\u8868\uff0cLDT\u4e3a\u4e8c\u7ea7\u63cf\u8ff0\u7b26\u8868\u3002<\/p>\n
                  LDT\u4e0d\u5305\u542b\u5728GDT\u4e2d\u3002GDT\u4e2d\u53ea\u662f\u5305\u542b\u4e86LDT\u63cf\u8ff0\u7b26\uff08\u4e00\u4e2a\u6307\u5411LDT\u8d77\u59cb\u5730\u5740\u7684\u6307\u9488\uff09\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
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