{"id":62008,"date":"2025-04-29T12:43:46","date_gmt":"2025-04-29T04:43:46","guid":{"rendered":"https:\/\/fwq.ai\/blog\/62008\/"},"modified":"2025-04-29T12:43:46","modified_gmt":"2025-04-29T04:43:46","slug":"linux%e9%a9%b1%e5%8a%a8io%e7%af%87-mmap%e6%93%8d%e4%bd%9c-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/62008\/","title":{"rendered":"Linux\u9a71\u52a8IO\u7bc7\u2014\u2014mmap\u64cd\u4f5c"},"content":{"rendered":"

<\/span>\u524d\u8a00<\/span> <\/span> <\/h2>\n

\u5e73\u65f6\u6211\u4eec\u5199Linux\u9a71\u52a8\u548c\u7528\u6237\u7a7a\u95f4\u4ea4\u4e92\u65f6\uff0c\u90fd\u662f\u901a\u8fc7copy_from_user\u628a\u7528\u6237\u7a7a\u95f4\u4f20\u8fc7\u6765\u7684\u6570\u636e\u8fdb\u884c\u62f7\u8d1d\uff0c\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u505a\u5462\uff1f<\/p>\n

\u56e0\u4e3a\u7528\u6237\u7a7a\u95f4\u662f\u4e0d\u80fd\u76f4\u63a5\u5185\u6838\u7a7a\u95f4\u6570\u636e\u7684\uff0c\u4ed6\u4eec\u6620\u5c04\u7684\u662f\u4e0d\u540c\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u53ea\u80fd\u5148\u5c06\u6570\u636e\u62f7\u8d1d\u8fc7\u6765\uff0c\u7136\u540e\u518d\u64cd\u4f5c\u3002<\/p>\n

\u5982\u679c\u7528\u6237\u7a7a\u95f4\u9700\u8981\u4f20\u51e0MB\u7684\u6570\u636e\u7ed9\u5185\u6838\uff0c\u90a3\u4e48\u539f\u6765\u7684\u62f7\u8d1d\u65b9\u5f0f\u663e\u7136\u6548\u7387\u7279\u522b\u4f4e\uff0c\u4e5f\u4e0d\u592a\u73b0\u5b9e\uff0c\u90a3\u600e\u4e48\u529e\u5462\uff1f<\/p>\n

\u60f3\u60f3\uff0c\u4e4b\u6240\u4ee5\u8981\u62f7\u8d1d\u662f\u56e0\u4e3a\u7528\u6237\u7a7a\u95f4\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\uff0c\u90a3\u5982\u679c\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\u7684buffer\uff0c\u662f\u4e0d\u662f\u5c31\u89e3\u51b3\u4e86\u3002<\/p>\n

\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u8ba9\u4e00\u5757\u7269\u7406\u5185\u5b58\u62e5\u6709\u4e24\u4efd\u6620\u5c04\uff0c\u5373\u62e5\u6709\u4e24\u4e2a\u865a\u62df\u5730\u5740\uff0c\u4e00\u4e2a\u5728\u5185\u6838\u7a7a\u95f4\uff0c\u4e00\u4e2a\u5728\u7528\u6237\u7a7a\u95f4\u3002<\/strong>\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n

\"Linux\u9a71\u52a8IO\u7bc7\u2014\u2014mmap\u64cd\u4f5c\u63d2\u56fe\" <\/p>\n

\u901a\u8fc7mmap\u6620\u5c04\u5c31\u53ef\u4ee5\u5b9e\u73b0\u3002<\/p>\n

<\/span>\u5e94\u7528\u5c42<\/span> <\/span> <\/h2>\n

\u5e94\u7528\u5c42\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u4e3b\u8981\u5c31\u662f\u901a\u8fc7mmap\u7cfb\u7edf\u8c03\u7528<\/strong>\u8fdb\u884c\u6620\u5c04\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u5bf9\u8fd4\u56de\u7684\u5730\u5740\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n

char * buf;\n\/* 1. \u6253\u5f00\u6587\u4ef6 *\/\n fd = open(\"\/dev\/hello\", O_RDWR);\n if (fd == -1)\n {\n      printf(\"can not open file \/dev\/hello\n\");\n      return -1;\n }\n\n\/* 2. mmap\n       * MAP_SHARED  : \u591a\u4e2aAPP\u90fd\u8c03\u7528mmap\u6620\u5c04\u540c\u4e00\u5757\u5185\u5b58\u65f6, \u5bf9\u5185\u5b58\u7684\u4fee\u6539\u5927\u5bb6\u90fd\u53ef\u4ee5\u770b\u5230\u3002\n       *               \u5c31\u662f\u8bf4\u591a\u4e2aAPP\u3001\u9a71\u52a8\u7a0b\u5e8f\u5b9e\u9645\u4e0a\u8bbf\u95ee\u7684\u90fd\u662f\u540c\u4e00\u5757\u5185\u5b58\n       * MAP_PRIVATE : \u521b\u5efa\u4e00\u4e2acopy on write\u7684\u79c1\u6709\u6620\u5c04\u3002\n       *               \u5f53APP\u5bf9\u8be5\u5185\u5b58\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u5176\u4ed6\u7a0b\u5e8f\u662f\u770b\u4e0d\u5230\u8fd9\u4e9b\u4fee\u6539\u7684\u3002\n       *               \u5c31\u662f\u5f53APP\u5199\u5185\u5b58\u65f6, \u5185\u6838\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u62f7\u8d1d\u7ed9\u8fd9\u4e2aAPP,\n       *               \u8fd9\u4e2a\u62f7\u8d1d\u662f\u8fd9\u4e2aAPP\u79c1\u6709\u7684, \u5176\u4ed6APP\u3001\u9a71\u52a8\u65e0\u6cd5\u8bbf\u95ee\u3002\n       *\/\nbuf =  mmap(NULL, 1024*8, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
mmap\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u60f3\u8981\u6620\u5c04\u7684\u8d77\u59cb\u5730\u5740\uff0c\u901a\u5e38\u8bbe\u7f6e\u4e3aNULL\uff0c\u8868\u793a\u7531\u5185\u6838\u6765\u51b3\u5b9a\u8be5\u8d77\u59cb\u5730\u5740<\/strong>\u3002<\/p>\n
\u7b2c\u4e8c\u53c2\u6570\u662f\u8981\u6620\u5c04\u7684\u5185\u5b58\u7a7a\u95f4\u7684\u5927\u5c0f<\/strong>\u3002<\/p>\n
\u7b2c\u4e09\u4e2a\u53c2\u6570PROT_READ | PROT_WRITE\u8868\u793a\u6620\u5c04\u540e\u7684\u7a7a\u95f4\u662f\u53ef\u8bfb\u53ef\u5199<\/strong>\u7684\u3002<\/p>\n
\u7b2c\u56db\u4e2a\u53c2\u6570\u53ef\u586bMAP_SHARED\u6216MAP_PRIVATE\uff1a<\/p>\n
    \n
  •   MAP_SHARED\uff1a\u591a\u4e2aAPP\u90fd\u8c03\u7528mmap\u6620\u5c04\u540c\u4e00\u5757\u5185\u5b58\u65f6, \u5bf9\u5185\u5b58\u7684\u4fee\u6539\u5927\u5bb6\u90fd\u53ef\u4ee5\u770b\u5230\u3002\u5c31\u662f\u8bf4\u591a\u4e2aAPP\u3001\u9a71\u52a8\u7a0b\u5e8f\u5b9e\u9645\u4e0a \u8bbf\u95ee\u7684\u90fd\u662f\u540c\u4e00\u5757\u5185\u5b58<\/strong>\u3002 <\/li>\n
  •   MAP_PRIVATE\uff1a\u521b\u5efa\u4e00\u4e2acopy on write\u7684\u79c1\u6709\u6620\u5c04\u3002\u5f53APP\u5bf9\u8be5\u5185\u5b58\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u5176\u4ed6\u7a0b\u5e8f\u662f\u770b\u4e0d\u5230\u8fd9\u4e9b\u4fee\u6539\u7684\u3002\u5c31\u662f\u5f53APP \u5199\u5185\u5b58\u65f6, \u5185\u6838\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u62f7\u8d1d\u7ed9\u8fd9\u4e2a<\/strong>APP\uff0c\u8fd9\u4e2a\u62f7\u8d1d\u662f\u8fd9\u4e2aAPP\u79c1\u6709\u7684, \u5176\u4ed6APP\u3001\u9a71\u52a8\u65e0\u6cd5\u8bbf\u95ee\u3002 <\/li>\n<\/ul>\n
     <\/span>\u9a71\u52a8\u5c42<\/span> <\/span> <\/h2>\n
    \u9a71\u52a8\u5c42\u4e3b\u8981\u662f\u5b9e\u73b0mmap\u63a5\u53e3\uff0c\u800cmmap\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u4e3b\u8981\u662f\u8c03\u7528\u4e86remap_pfn_range\u51fd\u6570\uff0c\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n
    int remap_pfn_range(\n  struct vm_area_struct *vma, \n  unsigned long addr, \n  unsigned long pfn, \n  unsigned long size, \n  pgprot_t prot);<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    vma\uff1a\u63cf\u8ff0\u4e00\u7247\u6620\u5c04\u533a\u57df\u7684\u7ed3\u6784\u4f53\u6307\u9488<\/p>\n
    addr\uff1a\u8981\u6620\u5c04\u7684\u865a\u62df\u5730\u5740\u8d77\u59cb\u5730\u5740<\/p>\n
    pfn\uff1a\u7269\u7406\u5185\u5b58\u6240\u5bf9\u5e94\u7684\u9875\u6846\u53f7\uff0c\u5c31\u662f\u5c06\u7269\u7406\u5730\u5740\u9664\u4ee5\u9875\u5927\u5c0f\u5f97\u5230\u7684\u503c<\/p>\n
    size\uff1a\u6620\u5c04\u7684\u5927\u5c0f<\/p>\n
    prot\uff1a\u8be5\u5185\u5b58\u533a\u57df\u7684\u8bbf\u95ee\u6743\u9650<\/p>\n
    \u9a71\u52a8\u4e3b\u8981\u6b65\u9aa4\uff1a<\/p>\n
    1\u3001\u4f7f\u7528kmalloc\u6216\u8005kzalloc\u51fd\u6570\u5206\u914d\u4e00\u5757\u5185\u5b58kernel_buf\uff0c\u56e0\u4e3a\u8fd9\u6837\u5206\u914d\u7684\u5185\u5b58<\/strong>\u7269\u7406\u5730\u5740\u662f\u8fde\u7eed<\/strong>\u7684\uff0cmmap\u540e\u5e94\u7528\u5c42\u4f1a\u5bf9\u8fd9\u4e00\u4e2a\u57fa\u5730\u5740\u53bb\u8bbf\u95ee\u8fd9\u5757\u5185\u5b58\u3002<\/p>\n
    2\u3001\u5b9e\u73b0mmap\u51fd\u6570<\/strong><\/p>\n
    static int hello_drv_mmap(struct file *file, struct vm_area_struct *vma)\n{\n \/* \u83b7\u5f97\u7269\u7406\u5730\u5740 *\/\n unsigned long phy = virt_to_phys(kernel_buf);\/\/kernel_buf\u662f\u5185\u6838\u7a7a\u95f4\u5206\u914d\u7684\u4e00\u5757\u865a\u62df\u5730\u5740\u7a7a\u95f4\n    \n    \/* \u8bbe\u7f6e\u5c5e\u6027\uff1acache, buffer*\/\n vma-&gt;vm_page_prot = pgprot_writecombine(vma-&gt;vm_page_prot);\n    \n    \/* map *\/\n    if(remap_pfn_range(vma, vma-&gt;vm_start, phy&gt;&gt;PAGE_SHFIT,\n                      vma-&gt;vm_end - vma-&gt;start, vma-&gt;vm_page_prot)){\n printk(\"mmap remap_pfn_range failed\n\");\n    return -ENOBUFS;\n }\n return 0;\n}\n\nstatic struct file_operations my_fops = {\n .mmap = hello_drv_mmap,\n};<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    1\u3001\u901a\u8fc7virt_to_phys\u5c06\u865a\u62df\u5730\u5740\u8f6c\u4e3a\u7269\u7406\u5730\u5740<\/strong>\uff0c\u8fd9\u91cc\u7684kernel_buf\u662f\u5185\u6838\u7a7a\u95f4\u7684\u4e00\u5757\u865a\u62df\u5730\u5740\u7a7a\u95f4<\/p>\n
    2\u3001\u8bbe\u7f6e\u5c5e\u6027<\/strong>\uff1a\u4e0d\u4f7f\u7528cache\uff0c\u4f7f\u7528buffer<\/p>\n
    3\u3001\u6620\u5c04<\/strong>\uff1a\u901a\u8fc7remap_pfn_range\u51fd\u6570\u6620\u5c04\uff0cphy>>PAGE_SHIFT\u5176\u5b9e\u5c31\u662f\u6309page\u6620\u5c04\uff0c\u9664\u4e86\u8fd9\u4e2a\u53c2\u6570\uff0c\u5176\u4ed6\u7684\u8d77\u59cb\u5730\u5740\u3001\u5927\u5c0f\u548c\u6743\u9650\u90fd\u53ef\u4ee5\u7531\u7528\u6237\u5728\u7cfb\u7edf\u8c03\u7528\u51fd\u6570\u4e2d\u6307\u5b9a<\/strong>\u3002<\/p>\n
    \u5f53\u5e94\u7528\u5c42\u8c03\u7528mmap\u540e\uff0c\u5c31\u4f1a\u8c03\u7528\u5230\u9a71\u52a8\u5c42\u7684mmap\u51fd\u6570\uff0c\u6700\u7ec8\u5e94\u7528\u5c42\u7684\u865a\u62df\u5730\u5740\u548c\u9a71\u52a8\u4e2d\u7684\u7269\u7406\u5730\u5740\u5c31\u5efa\u7acb\u4e86\u6620\u5c04\u5173\u7cfb\uff0c\u5e94\u7528\u5c42\u4e5f\u5c31\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u9a71\u52a8\u7684buffer\u4e86\u3002<\/p>\n<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fLinux\u9a71\u52a8IO\u7bc7\u2014\u2014mmap\u64cd\u4f5c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u524d\u8a00 \u5e73\u65f6\u6211\u4eec\u5199Linux\u9a71\u52a8\u548c\u7528\u6237\u7a7a\u95f4\u4ea4\u4e92\u65f6\uff0c\u90fd\u662f\u901a\u8fc7copy_from_user\u628a\u7528\u6237\u7a7a\u95f4\u4f20\u8fc7\u6765\u7684\u6570\u636e\u8fdb\u884c\u62f7\u8d1d\uff0c\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u505a\u5462\uff1f \u56e0\u4e3a\u7528\u6237\u7a7a\u95f4\u662f\u4e0d\u80fd\u76f4\u63a5\u5185\u6838\u7a7a\u95f4\u6570\u636e\u7684\uff0c\u4ed6\u4eec\u6620\u5c04\u7684\u662f\u4e0d\u540c\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u53ea\u80fd\u5148\u5c06\u6570\u636e\u62f7\u8d1d\u8fc7\u6765\uff0c\u7136\u540e\u518d\u64cd\u4f5c\u3002 \u5982\u679c\u7528\u6237\u7a7a\u95f4\u9700\u8981\u4f20\u51e0MB\u7684\u6570\u636e\u7ed9\u5185\u6838\uff0c\u90a3\u4e48\u539f\u6765\u7684\u62f7\u8d1d\u65b9\u5f0f\u663e\u7136\u6548\u7387\u7279\u522b\u4f4e\uff0c\u4e5f\u4e0d\u592a\u73b0\u5b9e\uff0c\u90a3\u600e\u4e48\u529e\u5462\uff1f \u60f3\u60f3\uff0c\u4e4b\u6240\u4ee5\u8981\u62f7\u8d1d\u662f\u56e0\u4e3a\u7528\u6237\u7a7a\u95f4\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\uff0c\u90a3\u5982\u679c\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u5185\u6838\u7a7a\u95f4\u7684buffer\uff0c\u662f\u4e0d\u662f\u5c31\u89e3\u51b3\u4e86\u3002 \u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u8ba9\u4e00\u5757\u7269\u7406\u5185\u5b58\u62e5\u6709\u4e24\u4efd\u6620\u5c04\uff0c\u5373\u62e5\u6709\u4e24\u4e2a\u865a\u62df\u5730\u5740\uff0c\u4e00\u4e2a\u5728\u5185\u6838\u7a7a\u95f4\uff0c\u4e00\u4e2a\u5728\u7528\u6237\u7a7a\u95f4\u3002\u5173\u7cfb\u5982\u4e0b\uff1a \u901a\u8fc7mmap\u6620\u5c04\u5c31\u53ef\u4ee5\u5b9e\u73b0\u3002 \u5e94\u7528\u5c42 \u5e94\u7528\u5c42\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u4e3b\u8981\u5c31\u662f\u901a\u8fc7mmap\u7cfb\u7edf\u8c03\u7528\u8fdb\u884c\u6620\u5c04\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u5bf9\u8fd4\u56de\u7684\u5730\u5740\u8fdb\u884c\u64cd\u4f5c\u3002 char * buf; \/* 1. \u6253\u5f00\u6587\u4ef6 *\/  fd = open(“\/dev\/hello”, O_RDWR);  if (fd == -1)  {       printf(“can not open file \/dev\/hello “);       return -1;  } \/* 2. mmap        * MAP_SHARED  : \u591a\u4e2aAPP\u90fd\u8c03\u7528mmap\u6620\u5c04\u540c\u4e00\u5757\u5185\u5b58\u65f6, \u5bf9\u5185\u5b58\u7684\u4fee\u6539\u5927\u5bb6\u90fd\u53ef\u4ee5\u770b\u5230\u3002        *               \u5c31\u662f\u8bf4\u591a\u4e2aAPP\u3001\u9a71\u52a8\u7a0b\u5e8f\u5b9e\u9645\u4e0a\u8bbf\u95ee\u7684\u90fd\u662f\u540c\u4e00\u5757\u5185\u5b58        * MAP_PRIVATE : \u521b\u5efa\u4e00\u4e2acopy on write\u7684\u79c1\u6709\u6620\u5c04\u3002        *               \u5f53APP\u5bf9\u8be5\u5185\u5b58\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u5176\u4ed6\u7a0b\u5e8f\u662f\u770b\u4e0d\u5230\u8fd9\u4e9b\u4fee\u6539\u7684\u3002        *               \u5c31\u662f\u5f53APP\u5199\u5185\u5b58\u65f6, \u5185\u6838\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u62f7\u8d1d\u7ed9\u8fd9\u4e2aAPP,        *               \u8fd9\u4e2a\u62f7\u8d1d\u662f\u8fd9\u4e2aAPP\u79c1\u6709\u7684, \u5176\u4ed6APP\u3001\u9a71\u52a8\u65e0\u6cd5\u8bbf\u95ee\u3002        *\/ buf =  mmap(NULL, 1024*8, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); \u767b\u5f55\u540e\u590d\u5236 mmap\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u60f3\u8981\u6620\u5c04\u7684\u8d77\u59cb\u5730\u5740\uff0c\u901a\u5e38\u8bbe\u7f6e\u4e3aNULL\uff0c\u8868\u793a\u7531\u5185\u6838\u6765\u51b3\u5b9a\u8be5\u8d77\u59cb\u5730\u5740\u3002 \u7b2c\u4e8c\u53c2\u6570\u662f\u8981\u6620\u5c04\u7684\u5185\u5b58\u7a7a\u95f4\u7684\u5927\u5c0f\u3002 \u7b2c\u4e09\u4e2a\u53c2\u6570PROT_READ | PROT_WRITE\u8868\u793a\u6620\u5c04\u540e\u7684\u7a7a\u95f4\u662f\u53ef\u8bfb\u53ef\u5199\u7684\u3002 \u7b2c\u56db\u4e2a\u53c2\u6570\u53ef\u586bMAP_SHARED\u6216MAP_PRIVATE\uff1a MAP_SHARED\uff1a\u591a\u4e2aAPP\u90fd\u8c03\u7528mmap\u6620\u5c04\u540c\u4e00\u5757\u5185\u5b58\u65f6, \u5bf9\u5185\u5b58\u7684\u4fee\u6539\u5927\u5bb6\u90fd\u53ef\u4ee5\u770b\u5230\u3002\u5c31\u662f\u8bf4\u591a\u4e2aAPP\u3001\u9a71\u52a8\u7a0b\u5e8f\u5b9e\u9645\u4e0a \u8bbf\u95ee\u7684\u90fd\u662f\u540c\u4e00\u5757\u5185\u5b58\u3002 MAP_PRIVATE\uff1a\u521b\u5efa\u4e00\u4e2acopy on write\u7684\u79c1\u6709\u6620\u5c04\u3002\u5f53APP\u5bf9\u8be5\u5185\u5b58\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u5176\u4ed6\u7a0b\u5e8f\u662f\u770b\u4e0d\u5230\u8fd9\u4e9b\u4fee\u6539\u7684\u3002\u5c31\u662f\u5f53APP \u5199\u5185\u5b58\u65f6, \u5185\u6838\u4f1a\u5148\u521b\u5efa\u4e00\u4e2a\u62f7\u8d1d\u7ed9\u8fd9\u4e2aAPP\uff0c\u8fd9\u4e2a\u62f7\u8d1d\u662f\u8fd9\u4e2aAPP\u79c1\u6709\u7684, \u5176\u4ed6APP\u3001\u9a71\u52a8\u65e0\u6cd5\u8bbf\u95ee\u3002 \u9a71\u52a8\u5c42 \u9a71\u52a8\u5c42\u4e3b\u8981\u662f\u5b9e\u73b0mmap\u63a5\u53e3\uff0c\u800cmmap\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u4e3b\u8981\u662f\u8c03\u7528\u4e86remap_pfn_range\u51fd\u6570\uff0c\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a int remap_pfn_range(   struct vm_area_struct *vma,    unsigned long addr,    unsigned long pfn,    unsigned long size,    pgprot_t prot); \u767b\u5f55\u540e\u590d\u5236 vma\uff1a\u63cf\u8ff0\u4e00\u7247\u6620\u5c04\u533a\u57df\u7684\u7ed3\u6784\u4f53\u6307\u9488 addr\uff1a\u8981\u6620\u5c04\u7684\u865a\u62df\u5730\u5740\u8d77\u59cb\u5730\u5740 pfn\uff1a\u7269\u7406\u5185\u5b58\u6240\u5bf9\u5e94\u7684\u9875\u6846\u53f7\uff0c\u5c31\u662f\u5c06\u7269\u7406\u5730\u5740\u9664\u4ee5\u9875\u5927\u5c0f\u5f97\u5230\u7684\u503c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-62008","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=62008"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/62008\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=62008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=62008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=62008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}