{"id":3435,"date":"2011-10-25T16:52:35","date_gmt":"2011-10-25T08:52:35","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=3435"},"modified":"2011-11-14T09:42:57","modified_gmt":"2011-11-14T01:42:57","slug":"linux%e4%b8%ad%e7%9a%84%e5%88%86%e9%a1%b5%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/3435","title":{"rendered":"Linux\u4e2d\u7684\u5206\u9875\u673a\u5236"},"content":{"rendered":"

Linux\u4e2d\u91c7\u7528\u4e86\u4e00\u79cd\u901a\u7528\u7684\u56db\u7ea7\u5206\u9875\u673a\u5236\uff0c\u5373\u9875\u5168\u5c40\u76ee\u5f55(Page Global Directory)\u3001\u9875\u4e0a\u7ea7\u76ee\u5f55(Page Upper Directory)\u3001\u9875\u4e2d\u95f4\u76ee\u5f55(Page Middle Directory)\u548c\u9875\u8868(Page Table)\u3002\u5728\u8fd9\u79cd\u5206\u9875\u673a\u5236\u4e0b\uff0c\u4e00\u4e2a\u5b8c\u6574\u7684\u7ebf\u6027\u5730\u5740\u88ab\u5206\u4e3a\u4e94\u90e8\u5206\uff1a\u9875\u5168\u5c40\u76ee\u5f55\u3001\u9875\u4e0a\u7ea7\u76ee\u5f55\u3001\u9875\u4e2d\u95f4\u76ee\u5f55\u3001\u9875\u8868\u548c\u504f\u79fb\u91cf\uff0c\u4f46\u662f\u5bf9\u4e8e\u6bcf\u4e2a\u90e8\u5206\u6240\u5360\u7684\u4f4d\u6570\u5219\u662f\u4e0d\u5b9a\u7684\uff0c\u8fd9\u8ddf\u7cfb\u7edf\u6240\u5728\u7684\u4f53\u7cfb\u67b6\u6784\u6709\u5173\u3002<\/p>\n

\u5bf9\u4e8ex86-32(\u672a\u91c7\u7528PAE)\u67b6\u6784\u7684\u7cfb\u7edf\u6765\u8bf4\uff0c\u7ebf\u6027\u5730\u5740\u4e2d\u7684\u9875\u4e0a\u7ea7\u76ee\u5f55\u548c\u9875\u4e2d\u95f4\u76ee\u5f55\u4e24\u90e8\u5206\u5360\u7528\u7684\u4f4d\u6570\u5747\u4e3a0\uff0c\u9875\u4e0a\u7ea7\u76ee\u5f55\u548c\u9875\u4e2d\u95f4\u76ee\u5f55\u4e2d\u90fd\u53ea\u5305\u542b\u4e00\u4e2a\u76ee\u5f55\u9879\uff0c\u8fd9\u4e24\u4e2a\u9875\u8868\u9879(\u8fd9\u91cc\u79f0\u4e3a\u9875\u76ee\u5f55\u9879\u66f4\u4e3a\u786e\u5207\uff0c\u4e0b\u6587\u4e2d\u7684\u9875\u8868\u9879\u5747\u6307\u67d0\u7ea7\u9875\u8868\u4e2d\u7684\u4e00\u9879\uff0c\u5bf9\u9875\u76ee\u5f55\u9879\u548c\u9875\u8868\u9879\u4e0d\u518d\u4f5c\u7279\u522b\u533a\u5206)\u90fd\u88ab\u6620\u5c04\u5230\u9875\u5168\u5c40\u76ee\u5f55\u4e2d\u4e00\u4e2a\u9002\u5f53\u7684\u76ee\u5f55\u9879\u4e2d\u3002\u8fd9\u79cd\u65b9\u6cd5\u672c\u8d28\u4e0a\u53ea\u5305\u542b\u4e24\u7ea7\u9875\u8868\uff0c\u4f46\u662f\u5b83\u5374\u4ecd\u7136\u4fdd\u6301\u7740\u56db\u7ea7\u9875\u8868\u6a21\u578b\u3002\u5176\u4ed6\u672a\u91c7\u7528\u56db\u7ea7\u9875\u8868\u6a21\u578b\u7684\u4f53\u7cfb\u67b6\u6784\u90fd\u91c7\u7528\u7c7b\u4f3c\u7684\u65b9\u6cd5\uff0c\u56e0\u6b64\u8fd9\u79cd\u56db\u7ea7\u5206\u9875\u673a\u5236\u5177\u6709\u901a\u7528\u6027\u3002<\/p>\n

1.\u6570\u636e\u7ed3\u6784<\/h3>\n

Linux\u5206\u522b\u91c7\u7528pgd_t\u3001pmd_t\u3001pud_t\u548cpte_t\u56db\u79cd\u6570\u636e\u7ed3\u6784\u6765\u8868\u793a\u9875\u5168\u5c40\u76ee\u5f55\u9879\u3001\u9875\u4e0a\u7ea7\u76ee\u5f55\u9879\u3001\u9875\u4e2d\u95f4\u76ee\u5f55\u9879\u548c\u9875\u8868\u9879\u3002\u8fd9\u56db\u79cd\u6570\u636e\u7ed3\u6784\u672c\u8d28\u4e0a\u90fd\u662f\u65e0\u7b26\u53f7\u957f\u6574\u578b\uff0cLinux\u4e3a\u4e86\u66f4\u4e25\u683c\u6570\u636e\u7c7b\u578b\u68c0\u67e5\uff0c\u5c06\u65e0\u7b26\u53f7\u957f\u6574\u578b\u5206\u522b\u5c01\u88c5\u6210\u56db\u79cd\u4e0d\u540c\u7684\u9875\u8868\u9879\u3002\u5982\u679c\u4e0d\u91c7\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u90a3\u4e48\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b\u6570\u636e\u53ef\u4ee5\u4f20\u5165\u4efb\u4f55\u4e00\u4e2a\u4e0e\u56db\u79cd\u9875\u8868\u76f8\u5173\u7684\u51fd\u6570\u6216\u5b8f\u4e2d\uff0c\u8fd9\u5c06\u5927\u5927\u964d\u4f4e\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u3002\u4e0b\u9762\u4ec5\u5217\u51fapgd_t\u7c7b\u578b\u7684\u5185\u6838\u6e90\u7801\u5b9e\u73b0\uff0c\u5176\u4ed6\u7c7b\u578b\u4e0e\u6b64\u7c7b\u4f3c\u3002<\/p>\n

\r\narch\/x86\/include\/asm\/pgtable_64_types.h\r\n 13 typedef unsigned long   pgdval_t;\r\narch\/x86\/include\/asm\/pgtable_types.h\r\n192 typedef struct { pgdval_t pgd; } pgd_t;\r\narch\/x86\/include\/asm\/pgtable.h\r\n 66 #define pgd_val(x)      native_pgd_val(x)\r\narch\/x86\/include\/asm\/pgtable_types.h\r\n199 static inline pgdval_t native_pgd_val(pgd_t pgd)\r\n200 {\r\n201         return pgd.pgd;\r\n202 }\r\n<\/pre>\n
\u8fd9\u91cc\u9700\u8981\u533a\u522b\u6307\u5411\u9875\u8868\u9879\u7684\u6307\u9488\u548c\u9875\u8868\u9879\u6240\u4ee3\u8868\u7684\u6570\u636e\u3002\u5982\u679c\u5df2\u77e5\u4e00\u4e2apgd_t\u7c7b\u578b\u7684\u6307\u9488pgd\uff0c\u90a3\u4e48\u901a\u8fc7pgd_val(*pgd)\u5373\u53ef\u83b7\u5f97\u8be5\u9875\u8868\u9879(\u4e5f\u5c31\u662f\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b\u6570\u636e)\uff0c\u8fd9\u91cc\u5229\u7528\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u601d\u60f3\u3002<\/p>\n
2.\u7ebf\u6027\u5730\u5740\u3001\u9875\u8868\u548c\u9875\u8868\u9879<\/h3>\n
\u7ebf\u6027\u5730\u5740<\/strong><\/p>\n
\u4e0d\u7ba1\u7cfb\u7edf\u91c7\u7528\u591a\u5c11\u7ea7\u5206\u9875\u6a21\u578b\uff0c\u7ebf\u6027\u5730\u5740\u672c\u8d28\u4e0a\u90fd\u662f\u7d22\u5f15+\u504f\u79fb\u91cf\u7684\u5f62\u5f0f\uff0c\u751a\u81f3\u4f60\u53ef\u4ee5\u5c06\u6574\u4e2a\u7ebf\u6027\u5730\u5740\u770b\u4f5cN+1\u4e2a\u7d22\u5f15\u7684\u7ec4\u5408\uff0cN\u662f\u7cfb\u7edf\u91c7\u7528\u7684\u5206\u9875\u7ea7\u6570\u3002\u5728\u56db\u7ea7\u5206\u9875\u6a21\u578b\u4e0b\uff0c\u7ebf\u6027\u5730\u5740\u88ab\u5206\u4e3a5\u90e8\u5206\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n
\"\"<\/a><\/p>\n
 <\/p>\n
\u5728\u7ebf\u6027\u5730\u5740\u4e2d\uff0c\u6bcf\u4e2a\u9875\u8868\u7d22\u5f15\u5373\u4ee3\u8868\u7ebf\u6027\u5730\u5740\u5728\u5bf9\u5e94\u7ea7\u522b\u7684\u9875\u8868\u4e2d\u4e2d\u5173\u8054\u7684\u9875\u8868\u9879\u3002\u6b63\u662f\u8fd9\u79cd\u7d22\u5f15\u4e0e\u9875\u8868\u9879\u7684\u5bf9\u5e94\u5173\u7cfb\u5f62\u6210\u4e86\u6574\u4e2a\u9875\u8868\u6620\u5c04\u673a\u5236\u3002<\/p>\n
\u9875\u8868<\/strong><\/p>\n
\u591a\u4e2a\u9875\u8868\u9879\u7684\u96c6\u5408\u5219\u4e3a\u9875\u8868\uff0c\u4e00\u4e2a\u9875\u8868\u5185\u7684\u6240\u6709\u9875\u8868\u9879\u662f\u8fde\u7eed\u5b58\u653e\u7684\u3002\u9875\u8868\u672c\u8d28\u4e0a\u662f\u4e00\u5806\u6570\u636e\uff0c\u56e0\u6b64\u4e5f\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u5b58\u653e\u5728\u4e3b\u5b58\u4e2d\u7684\u3002\u56e0\u6b64\uff0c\u5728\u865a\u62df\u5730\u5740\u8f6c\u5316\u7269\u7406\u7269\u7406\u5730\u5740\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u8bbf\u95ee\u4e00\u7ea7\u9875\u8868\u5c31\u4f1a\u8bbf\u95ee\u4e00\u6b21\u5185\u5b58\u3002<\/p>\n
\u9875\u8868\u9879<\/strong><\/p>\n
\u4ece\u56db\u79cd\u9875\u8868\u9879\u7684\u6570\u636e\u7ed3\u6784\u53ef\u4ee5\u770b\u51fa\uff0c\u6bcf\u4e2a\u9875\u8868\u9879\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b\u6570\u636e\u3002\u6bcf\u4e2a\u9875\u8868\u9879\u5206\u4e24\u5927\u7c7b\u4fe1\u606f\uff1a\u9875\u6846\u57fa\u5730\u5740\u548c\u9875\u7684\u5c5e\u6027\u4fe1\u606f\u3002\u5728x86-32\u4f53\u7cfb\u7ed3\u6784\u4e2d\uff0c\u6bcf\u4e2a\u9875\u8868\u9879\u7684\u7ed3\u6784\u56fe\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/a><\/p>\n
\u8fd9\u4e2a\u56fe\u662f\u4e00\u4e2a\u901a\u7528\u6a21\u578b\uff0c\u5176\u4e2d\u9875\u8868\u9879\u7684\u524d20\u4f4d\u662f\u7269\u7406\u9875\u7684\u57fa\u5730\u5740\u3002\u7531\u4e8e32\u4f4d\u7684\u7cfb\u7edf\u91c7\u75284kb\u5927\u5c0f\u7684 \u9875\uff0c\u56e0\u6b64\u6bcf\u4e2a\u9875\u8868\u9879\u7684\u540e12\u4f4d\u5747\u4e3a0\u3002\u5185\u6838\u5c06\u540e12\u4f4d\u5145\u5206\u5229\u7528\uff0c\u6bcf\u4e2a\u4f4d\u90fd\u8868\u793a\u5bf9\u5e94\u865a\u62df\u9875\u7684\u76f8\u5173\u5c5e\u6027\u3002<\/p>\n
\u4e0d\u7ba1\u662f\u90a3\u4e00\u7ea7\u7684\u9875\u8868\uff0c\u5b83\u7684\u529f\u80fd\u5c31\u662f\u5efa\u7acb\u865a\u62df\u5730\u5740\u548c\u7269\u7406\u5730\u5740\u4e4b\u95f4\u7684\u6620\u5c04\u5173\u7cfb\uff0c\u4e00\u4e2a\u9875\u548c\u4e00\u4e2a\u9875\u6846\u4e4b\u95f4\u7684\u6620\u5c04\u5173\u7cfb\u4f53\u73b0\u5728\u9875\u8868\u9879\u4e2d\u3002\u4e0a\u56fe\u4e2d\u7684\u7269\u7406\u9875\u57fa\u5730\u5740\u662f\u4e2a\u62bd\u8c61\u7684\u8bf4\u660e\uff0c\u5982\u679c\u5f53\u524d\u7684\u9875\u8868\u9879\u4f4d\u4e8e\u9875\u5168\u5c40\u76ee\u5f55\u4e2d\uff0c\u8fd9\u4e2a\u7269\u7406\u9875\u57fa\u5740\u662f\u6307\u9875\u4e0a\u7ea7\u76ee\u5f55\u6240\u5728\u7269\u7406\u9875\u7684\u57fa\u5730\u5740\uff1b\u5982\u679c\u5f53\u524d\u9875\u8868\u9879\u4f4d\u4e8e\u9875\u8868\u4e2d\uff0c\u8fd9\u4e2a\u7269\u7406\u9875\u57fa\u5730\u5740\u662f\u6307\u6700\u7ec8\u8981\u8bbf\u95ee\u6570\u636e\u6240\u5728\u7269\u7406\u9875\u7684\u57fa\u5730\u5740\u3002<\/p>\n
\u00a03.\u5730\u5740\u8f6c\u6362\u8fc7\u7a0b<\/h3>\n
\u6709\u4e86\u4e0a\u8ff0\u7684\u57fa\u672c\u77e5\u8bc6\uff0c\u5c31\u5f88\u597d\u7406\u89e3\u56db\u7ea7\u9875\u8868\u6a21\u5f0f\u4e0b\u5982\u4f55\u5c06\u865a\u62df\u5730\u5740\u8f6c\u5316\u4e3a\u903b\u8f91\u5730\u5740\u4e86\u3002\u57fa\u672c\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
1.\u4eceCR3\u5bc4\u5b58\u5668\u4e2d\u8bfb\u53d6\u9875\u76ee\u5f55\u6240\u5728\u7269\u7406\u9875\u9762\u7684\u57fa\u5740(\u5373\u6240\u8c13\u7684\u9875\u76ee\u5f55\u57fa\u5740)\uff0c\u4ece\u7ebf\u6027\u5730\u5740\u7684\u7b2c\u4e00\u90e8\u5206\u83b7\u53d6\u9875\u76ee\u5f55\u9879\u7684\u7d22\u5f15\uff0c\u4e24\u8005\u76f8\u52a0\u5f97\u5230\u9875\u76ee\u5f55\u9879\u7684\u7269\u7406\u5730\u5740\u3002<\/p>\n
2.\u7b2c\u4e00\u6b21\u8bfb\u53d6\u5185\u5b58\u5f97\u5230pgd_t\u7ed3\u6784\u7684\u76ee\u5f55\u9879\uff0c\u4ece\u4e2d\u53d6\u51fa\u7269\u7406\u9875\u57fa\u5740\u53d6\u51fa(\u5177\u4f53\u4f4d\u6570\u4e0e\u5e73\u53f0\u76f8\u5173\uff0c\u5982\u679c\u662f32\u7cfb\u7edf\uff0c\u5219\u4e3a20\u4f4d)\uff0c\u5373\u9875\u4e0a\u7ea7\u9875\u76ee\u5f55\u7684\u7269\u7406\u57fa\u5730\u5740\u3002<\/p>\n
3.\u4ece\u7ebf\u6027\u5730\u5740\u7684\u7b2c\u4e8c\u90e8\u5206\u4e2d\u53d6\u51fa\u9875\u4e0a\u7ea7\u76ee\u5f55\u9879\u7684\u7d22\u5f15\uff0c\u4e0e\u9875\u4e0a\u7ea7\u76ee\u5f55\u57fa\u5730\u5740\u76f8\u52a0\u5f97\u5230\u9875\u4e0a\u7ea7\u76ee\u5f55\u9879\u7684\u7269\u7406\u5730\u5740\u3002<\/p>\n
4.\u7b2c\u4e8c\u6b21\u8bfb\u53d6\u5185\u5b58\u5f97\u5230pud_t\u7ed3\u6784\u7684\u76ee\u5f55\u9879\uff0c\u4ece\u4e2d\u53d6\u51fa\u9875\u4e2d\u95f4\u76ee\u5f55\u7684\u7269\u7406\u57fa\u5730\u5740\u3002<\/p>\n
5.\u4ece\u7ebf\u6027\u5730\u5740\u7684\u7b2c\u4e09\u90e8\u5206\u4e2d\u53d6\u51fa\u9875\u4e2d\u95f4\u76ee\u5f55\u9879\u7684\u7d22\u5f15\uff0c\u4e0e\u9875\u4e2d\u95f4\u76ee\u5f55\u57fa\u5740\u76f8\u52a0\u5f97\u5230\u9875\u4e2d\u95f4\u76ee\u5f55\u9879\u7684\u7269\u7406\u5730\u5740\u3002<\/p>\n
6.\u7b2c\u4e09\u6b21\u8bfb\u53d6\u5185\u5b58\u5f97\u5230pmd_t\u7ed3\u6784\u7684\u76ee\u5f55\u9879\uff0c\u4ece\u4e2d\u53d6\u51fa\u9875\u8868\u7684\u7269\u7406\u57fa\u5730\u5740\u3002<\/p>\n
7.\u4ece\u7ebf\u6027\u5730\u5740\u7684\u7b2c\u56db\u90e8\u5206\u4e2d\u53d6\u51fa\u9875\u8868\u9879\u7684\u7d22\u5f15\uff0c\u4e0e\u9875\u8868\u57fa\u5740\u76f8\u52a0\u5f97\u5230\u9875\u8868\u9879\u7684\u7269\u7406\u5730\u5740\u3002<\/p>\n
8.\u7b2c\u56db\u6b21\u8bfb\u53d6\u5185\u5b58\u5f97\u5230pte_t\u7ed3\u6784\u7684\u76ee\u5f55\u9879\uff0c\u4ece\u4e2d\u53d6\u51fa\u7269\u7406\u9875\u7684\u57fa\u5730\u5740\u3002<\/p>\n
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10.\u7b2c\u4e94\u6b21\u8bfb\u53d6\u5185\u5b58\u5f97\u5230\u6700\u7ec8\u8981\u8bbf\u95ee\u7684\u6570\u636e\u3002<\/p>\n
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