{"id":69961,"date":"2026-02-01T08:49:00","date_gmt":"2026-02-01T00:49:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/69961.html"},"modified":"2026-02-01T08:49:00","modified_gmt":"2026-02-01T00:49:00","slug":"pa3%e4%b9%8b%e7%ae%80%e6%98%93%e6%96%87%e4%bb%b6%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/69961.html","title":{"rendered":"PA3\u4e4b\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf"},"content":{"rendered":"
\n
  • \u6587\u7ae0\u4e3a\u672c\u4eba\u81ea\u5b66\u8bb0\u5f55\u7684\u5206\u4eab（\u975eNJU\u5b66\u751f），\u4ee3\u7801\u4e0d\u4fdd\u8bc1\u6b63\u786e，\u5982\u679c\u4f60\u662fNJU\u7684\u8be5\u5b9e\u9a8c\u8bfe\u5b66\u5458\u6216\u8005YSYX\u7684A\u9636\u6bb5\u5b66\u5458，\u8bf7\u81ea\u89c9\u9075\u5b88\u5b66\u672f\u8bda\u4fe1\u3002<\/li>\n
  • \u5982\u679c\u672c\u6587\u9020\u6210\u4e0d\u826f\u5f71\u54cd\u8bf7\u8054\u7cfb\u6211\u64a4\u56de\u3002<\/li>\n
  • \u5b9e\u9a8c\u4e3a\u5357\u4eac\u5927\u5b66 \u8ba1\u7b97\u673a\u79d1\u5b66\u4e0e\u6280\u672f\u7cfb \u8ba1\u7b97\u673a\u7cfb\u7edf\u57fa\u7840 \u8bfe\u7a0b\u5b9e\u9a8c\u3002\u5b9e\u9a8c\u6587\u6863：https:\/\/ysyx.oscc.cc\/docs\/ics-pa\/\u3002<\/li>\n
    \n

    \u7b80\u6613\u6587\u4ef6\u7cfb\u7edf<\/h2>\n

    \u5173\u952e\u5b9e\u73b0<\/h3>\n

    \u8981\u505a\u7684\u4e8b\u60c5\u53ef\u4ee5\u62c6\u6210\u4e09\u5757：\u7528\u6237\u6001（libos \u7684\u7cfb\u7edf\u8c03\u7528\u5c01\u88c5）\u3001\u5185\u6838\u6001（do_syscall \u589e\u52a0 SYS_open\/read\/write\/close\/lseek \u5206\u53d1）\u3001\u6587\u4ef6\u7cfb\u7edf\u5b9e\u73b0（nanos-lite\/src\/fs.c \u91cc\u5b9e\u73b0 fs_open\/fs_read\/fs_write\/fs_lseek\/fs_close，\u5e76\u7ef4\u62a4 open_offset）\u3002
    \n(1)navy-apps\/libs\/libos\/src\/syscall.c<\/p>\n

    int<\/span> _open<\/span>(<\/span>const<\/span> char<\/span> *<\/span>path,<\/span> int<\/span> flags,<\/span> mode_t<\/span> mode)<\/span> {<\/span>
    \n return<\/span> _syscall_<\/span>(<\/span>SYS_open,<\/span> (<\/span>intptr_t<\/span>)<\/span>path,<\/span> flags,<\/span> mode)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> _read<\/span>(<\/span>int<\/span> fd,<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> count)<\/span> {<\/span>
    \n return<\/span> _syscall_<\/span>(<\/span>SYS_read,<\/span> fd,<\/span> (<\/span>intptr_t<\/span>)<\/span>buf,<\/span> count)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> _close<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span>
    \n return<\/span> _syscall_<\/span>(<\/span>SYS_close,<\/span> fd,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    off_t<\/span> _lseek<\/span>(<\/span>int<\/span> fd,<\/span> off_t<\/span> offset,<\/span> int<\/span> whence)<\/span> {<\/span>
    \n return<\/span> _syscall_<\/span>(<\/span>SYS_lseek,<\/span> fd,<\/span> offset,<\/span> whence)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    (2)\u5b9e\u73b0 nanos-lite\/src\/fs.c \u7684\u6838\u5fc3\u903b\u8f91<\/p>\n

    typedef<\/span> struct<\/span> {<\/span>
    \n char<\/span> *<\/span>name;<\/span>
    \n size_t<\/span> size;<\/span>
    \n size_t<\/span> disk_offset;<\/span>
    \n size_t<\/span> open_offset;<\/span> \/\/ \u65b0\u589e<\/span>
    \n ReadFn read;<\/span>
    \n WriteFn write;<\/span>
    \n}<\/span> Finfo;<\/span><\/p>\n

    int<\/span> fs_open<\/span>(<\/span>const<\/span> char<\/span> *<\/span>pathname,<\/span> int<\/span> flags,<\/span> int<\/span> mode)<\/span> {<\/span>
    \n (<\/span>void<\/span>)<\/span>flags;<\/span>
    \n (<\/span>void<\/span>)<\/span>mode;<\/span>
    \n for<\/span> (<\/span>int<\/span> fd =<\/span> 0<\/span>;<\/span> fd <<\/span> (<\/span>int<\/span>)<\/span>(<\/span>sizeof<\/span>(<\/span>file_table)<\/span> \/<\/span> sizeof<\/span>(<\/span>file_table[<\/span>0<\/span>]<\/span>)<\/span>)<\/span>;<\/span>
    \n fd++<\/span>)<\/span> {<\/span>
    \n if<\/span> (<\/span>strcmp<\/span>(<\/span>file_table[<\/span>fd]<\/span>.<\/span>name,<\/span> pathname)<\/span> ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n file_table[<\/span>fd]<\/span>.<\/span>open_offset =<\/span> 0<\/span>;<\/span>
    \n return<\/span> fd;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n assert<\/span>(<\/span>0<\/span> &&<\/span> "fs_open: file not found"<\/span>)<\/span>;<\/span>
    \n return<\/span> –<\/span>1<\/span>;<\/span>
    \n}<\/span><\/p>\n

    size_t<\/span> fs_read<\/span>(<\/span>int<\/span> fd,<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n if<\/span> (<\/span>fd ==<\/span> FD_STDIN)<\/span>
    \n return<\/span> 0<\/span>;<\/span> \/\/ todo assert<\/span>
    \n if<\/span> (<\/span>fd ==<\/span> FD_STDOUT ||<\/span> fd ==<\/span> FD_STDERR)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    Finfo *<\/span>f =<\/span> &<\/span>file_table[<\/span>fd]<\/span>;<\/span>
    \n if<\/span> (<\/span>f-><\/span>open_offset >=<\/span> f-><\/span>size)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    size_t<\/span> remain =<\/span> f-><\/span>size –<\/span> f-><\/span>open_offset;<\/span>
    \n if<\/span> (<\/span>len ><\/span> remain)<\/span>
    \n len =<\/span> remain;<\/span><\/p>\n

    size_t<\/span> disk_off =<\/span> f-><\/span>disk_offset +<\/span> f-><\/span>open_offset;<\/span>
    \n size_t<\/span> r =<\/span> ramdisk_read<\/span>(<\/span>buf,<\/span> disk_off,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> r;<\/span>
    \n return<\/span> r;<\/span>
    \n}<\/span><\/p>\n

    size_t<\/span> fs_write<\/span>(<\/span>int<\/span> fd,<\/span> const<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n if<\/span> (<\/span>fd ==<\/span> FD_STDOUT ||<\/span> fd ==<\/span> FD_STDERR)<\/span> {<\/span>
    \n return<\/span> serial_write<\/span>(<\/span>buf,<\/span> 0<\/span>,<\/span> len)<\/span>;<\/span>
    \n }<\/span>
    \n if<\/span> (<\/span>fd ==<\/span> FD_STDIN)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    Finfo *<\/span>f =<\/span> &<\/span>file_table[<\/span>fd]<\/span>;<\/span>
    \n if<\/span> (<\/span>f-><\/span>open_offset >=<\/span> f-><\/span>size)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    size_t<\/span> remain =<\/span> f-><\/span>size –<\/span> f-><\/span>open_offset;<\/span>
    \n if<\/span> (<\/span>len ><\/span> remain)<\/span>
    \n len =<\/span> remain;<\/span><\/p>\n

    size_t<\/span> disk_off =<\/span> f-><\/span>disk_offset +<\/span> f-><\/span>open_offset;<\/span>
    \n size_t<\/span> w =<\/span> ramdisk_write<\/span>(<\/span>buf,<\/span> disk_off,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> w;<\/span>
    \n return<\/span> w;<\/span>
    \n}<\/span><\/p>\n

    off_t<\/span> fs_lseek<\/span>(<\/span>int<\/span> fd,<\/span> off_t<\/span> offset,<\/span> int<\/span> whence)<\/span> {<\/span>
    \n Finfo *<\/span>f =<\/span> &<\/span>file_table[<\/span>fd]<\/span>;<\/span>
    \n off_t<\/span> new_off =<\/span> 0<\/span>;<\/span><\/p>\n

    switch<\/span> (<\/span>whence)<\/span> {<\/span>
    \n case<\/span> SEEK_SET<\/span>:<\/span>
    \n new_off =<\/span> offset;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SEEK_CUR<\/span>:<\/span>
    \n new_off =<\/span> (<\/span>off_t<\/span>)<\/span>f-><\/span>open_offset +<\/span> offset;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SEEK_END<\/span>:<\/span>
    \n new_off =<\/span> (<\/span>off_t<\/span>)<\/span>f-><\/span>size +<\/span> offset;<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n assert<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u4e0d\u5141\u8bb8\u8d8a\u754c：<0 \u8bbe\u4e3a 0；>size \u8bbe\u4e3a size<\/span>
    \n if<\/span> (<\/span>new_off <<\/span> 0<\/span>)<\/span>
    \n new_off =<\/span> 0<\/span>;<\/span>
    \n if<\/span> (<\/span>new_off ><\/span> (<\/span>off_t<\/span>)<\/span>f-><\/span>size)<\/span>
    \n new_off =<\/span> (<\/span>off_t<\/span>)<\/span>f-><\/span>size;<\/span><\/p>\n

    f-><\/span>open_offset =<\/span> (<\/span>size_t<\/span>)<\/span>new_off;<\/span>
    \n return<\/span> new_off;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> fs_close<\/span>(<\/span>int<\/span> fd)<\/span> {<\/span> return<\/span> 0<\/span>;<\/span> }<\/span><\/p>\n

    (3)\u5728 Nanos-lite \u7684 do_syscall \u589e\u52a0\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528\u5206\u53d1<\/p>\n

    void<\/span> do_syscall<\/span>(<\/span>Context *<\/span>c)<\/span> {<\/span>
    \n uintptr_t<\/span> a[<\/span>4<\/span>]<\/span>;<\/span>
    \n a[<\/span>0<\/span>]<\/span> =<\/span> c-><\/span>GPR1;<\/span>
    \n a[<\/span>1<\/span>]<\/span> =<\/span> c-><\/span>GPR2;<\/span> \/\/ arg0<\/span>
    \n a[<\/span>2<\/span>]<\/span> =<\/span> c-><\/span>GPR3;<\/span> \/\/ arg1<\/span>
    \n a[<\/span>3<\/span>]<\/span> =<\/span> c-><\/span>GPR4;<\/span> \/\/ arg2<\/span><\/p>\n

    intptr_t<\/span> ret =<\/span> 0<\/span>;<\/span>
    \n switch<\/span> (<\/span>a[<\/span>0<\/span>]<\/span>)<\/span> {<\/span>
    \n case<\/span> SYS_yield:<\/span>
    \n yield<\/span>(<\/span>)<\/span>;<\/span>
    \n ret =<\/span> 0<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_exit:<\/span>
    \n halt<\/span>(<\/span>c-><\/span>GPRx)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_open:<\/span>
    \n ret =<\/span> fs_open<\/span>(<\/span>(<\/span>const<\/span> char<\/span> *<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>,<\/span> (<\/span>int<\/span>)<\/span>a[<\/span>2<\/span>]<\/span>,<\/span> (<\/span>int<\/span>)<\/span>a[<\/span>3<\/span>]<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_read:<\/span>
    \n ret =<\/span> fs_read<\/span>(<\/span>(<\/span>int<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>,<\/span> (<\/span>void<\/span> *<\/span>)<\/span>(<\/span>uintptr_t<\/span>)<\/span>a[<\/span>2<\/span>]<\/span>,<\/span> (<\/span>size_t<\/span>)<\/span>a[<\/span>3<\/span>]<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_write:<\/span>
    \n ret =<\/span> fs_write<\/span>(<\/span>(<\/span>int<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>,<\/span> (<\/span>const<\/span> void<\/span> *<\/span>)<\/span>(<\/span>uintptr_t<\/span>)<\/span>a[<\/span>2<\/span>]<\/span>,<\/span> (<\/span>size_t<\/span>)<\/span>a[<\/span>3<\/span>]<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_lseek:<\/span>
    \n ret =<\/span> fs_lseek<\/span>(<\/span>(<\/span>int<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>,<\/span> (<\/span>off_t<\/span>)<\/span>a[<\/span>2<\/span>]<\/span>,<\/span> (<\/span>int<\/span>)<\/span>a[<\/span>3<\/span>]<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_close:<\/span>
    \n ret =<\/span> fs_close<\/span>(<\/span>(<\/span>int<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> SYS_brk:<\/span>
    \n ret =<\/span> 0<\/span>;<\/span> \/\/ \u8fd9\u9636\u6bb5：\u603b\u662f\u6210\u529f<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n panic<\/span>(<\/span>"Unhandled syscall ID = %d"<\/span>,<\/span> a[<\/span>0<\/span>]<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n c-><\/span>GPRx =<\/span> ret;<\/span>
    \n}<\/span><\/p>\n

    \u8ba9loader\u4f7f\u7528\u6587\u4ef6\u5e76\u5b9e\u73b0\u5b8c\u6574\u7684\u6587\u4ef6\u7cfb\u7edf<\/h3>\n

    (1)\u5728loader\u4e2d\u4f7f\u7528\u6587\u4ef6\u540d\u6765\u6307\u5b9a\u52a0\u8f7d\u7684\u7a0b\u5e8f<\/p>\n

    static<\/span> uintptr_t<\/span> loader<\/span>(<\/span>PCB *<\/span>pcb,<\/span> const<\/span> char<\/span> *<\/span>filename)<\/span> {<\/span>
    \n (<\/span>void<\/span>)<\/span>pcb;<\/span><\/p>\n

    int<\/span> fd =<\/span> fs_open<\/span>(<\/span>filename,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    Elf_Ehdr eh;<\/span>
    \n fs_lseek<\/span>(<\/span>fd,<\/span> 0<\/span>,<\/span> SEEK_SET<\/span>)<\/span>;<\/span>
    \n fs_read<\/span>(<\/span>fd,<\/span> &<\/span>eh,<\/span> sizeof<\/span>(<\/span>eh)<\/span>)<\/span>;<\/span><\/p>\n

    assert<\/span>(<\/span>eh.<\/span>e_ident[<\/span>0<\/span>]<\/span> ==<\/span> 0x7f<\/span> &&<\/span> eh.<\/span>e_ident[<\/span>1<\/span>]<\/span> ==<\/span> 'E'<\/span> &&<\/span>
    \n eh.<\/span>e_ident[<\/span>2<\/span>]<\/span> ==<\/span> 'L'<\/span> &&<\/span> eh.<\/span>e_ident[<\/span>3<\/span>]<\/span> ==<\/span> 'F'<\/span>)<\/span>;<\/span><\/p>\n

    for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> eh.<\/span>e_phnum;<\/span> i++<\/span>)<\/span> {<\/span>
    \n Elf_Phdr ph;<\/span>
    \n size_t<\/span> ph_off =<\/span> eh.<\/span>e_phoff +<\/span> (<\/span>size_t<\/span>)<\/span>i *<\/span> eh.<\/span>e_phentsize;<\/span><\/p>\n

    fs_lseek<\/span>(<\/span>fd,<\/span> ph_off,<\/span> SEEK_SET<\/span>)<\/span>;<\/span>
    \n fs_read<\/span>(<\/span>fd,<\/span> &<\/span>ph,<\/span> sizeof<\/span>(<\/span>ph)<\/span>)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>ph.<\/span>p_type !=<\/span> PT_LOAD)<\/span>
    \n continue<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>ph.<\/span>p_filesz ><\/span> 0<\/span>)<\/span> {<\/span>
    \n fs_lseek<\/span>(<\/span>fd,<\/span> ph.<\/span>p_offset,<\/span> SEEK_SET<\/span>)<\/span>;<\/span>
    \n fs_read<\/span>(<\/span>fd,<\/span> (<\/span>void<\/span> *<\/span>)<\/span>(<\/span>uintptr_t<\/span>)<\/span>ph.<\/span>p_vaddr,<\/span> ph.<\/span>p_filesz)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    if<\/span> (<\/span>ph.<\/span>p_memsz ><\/span> ph.<\/span>p_filesz)<\/span> {<\/span>
    \n memset<\/span>(<\/span>(<\/span>void<\/span> *<\/span>)<\/span>(<\/span>(<\/span>uintptr_t<\/span>)<\/span>ph.<\/span>p_vaddr +<\/span> ph.<\/span>p_filesz)<\/span>,<\/span> 0<\/span>,<\/span>
    \n ph.<\/span>p_memsz –<\/span> ph.<\/span>p_filesz)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    fs_close<\/span>(<\/span>fd)<\/span>;<\/span>
    \n return<\/span> (<\/span>uintptr_t<\/span>)<\/span>eh.<\/span>e_entry;<\/span>
    \n}<\/span><\/p>\n

    (2)init_proc()\u65f6\u4f20\u5165\u6587\u4ef6\u540d<\/p>\n

    void<\/span> init_proc<\/span>(<\/span>)<\/span> {<\/span>
    \n switch_boot_pcb<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    Log<\/span>(<\/span>"Initializing processes…"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ load program here<\/span>
    \n naive_uload<\/span>(<\/span>NULL<\/span>,<\/span> "\/bin\/file-test"<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    Context*<\/span> schedule<\/span>(<\/span>Context *<\/span>prev)<\/span> {<\/span>
    \n return<\/span> NULL<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8f93\u51fa：
    \n\"\"<\/p>\n

    \u865a\u62df\u6587\u4ef6\u7cfb\u7edf<\/h2>\n

    \u8bfb\u5199\u51fd\u6570\u6307\u9488+ramdisk\u7684API\u5b9e\u73b0\u4e00\u5207\u7686\u6587\u4ef6<\/p>\n

    \/\/ FD = File Descriptor; FB = Frame Buffer<\/span>
    \nenum<\/span> {<\/span> FD_STDIN,<\/span> FD_STDOUT,<\/span> FD_STDERR,<\/span> FD_FB }<\/span>;<\/span><\/p>\n

    static<\/span> Finfo file_table[<\/span>]<\/span> __attribute__<\/span>(<\/span>(<\/span>used)<\/span>)<\/span> =<\/span> {<\/span>
    \n [<\/span>FD_STDIN]<\/span> =<\/span> {<\/span>"stdin"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> invalid_write}<\/span>,<\/span>
    \n [<\/span>FD_STDOUT]<\/span> =<\/span> {<\/span>"stdout"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n [<\/span>FD_STDERR]<\/span> =<\/span> {<\/span>"stderr"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n#<\/span>include<\/span> "files.h"<\/span><\/span>
    \n}<\/span>;<\/span><\/p>\n

    size_t<\/span> fs_read<\/span>(<\/span>int<\/span> fd,<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n Finfo *<\/span>f =<\/span> &<\/span>file_table[<\/span>fd]<\/span>;<\/span><\/p>\n

    \/\/ \u8bbe\u5907\u6587\u4ef6：\u6709 read \u51fd\u6570\u6307\u9488<\/span>
    \n if<\/span> (<\/span>f-><\/span>read !=<\/span> NULL<\/span>)<\/span> {<\/span>
    \n size_t<\/span> r =<\/span> f-><\/span>read<\/span>(<\/span>buf,<\/span> f-><\/span>open_offset,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> r;<\/span>
    \n return<\/span> r;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u666e\u901a\u6587\u4ef6（ramdisk）<\/span>
    \n if<\/span> (<\/span>f-><\/span>open_offset >=<\/span> f-><\/span>size)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    size_t<\/span> remain =<\/span> f-><\/span>size –<\/span> f-><\/span>open_offset;<\/span>
    \n if<\/span> (<\/span>len ><\/span> remain)<\/span>
    \n len =<\/span> remain;<\/span><\/p>\n

    size_t<\/span> disk_off =<\/span> f-><\/span>disk_offset +<\/span> f-><\/span>open_offset;<\/span>
    \n size_t<\/span> r =<\/span> ramdisk_read<\/span>(<\/span>buf,<\/span> disk_off,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> r;<\/span>
    \n return<\/span> r;<\/span>
    \n}<\/span><\/p>\n

    size_t<\/span> fs_write<\/span>(<\/span>int<\/span> fd,<\/span> const<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n Finfo *<\/span>f =<\/span> &<\/span>file_table[<\/span>fd]<\/span>;<\/span><\/p>\n

    \/\/ \u8bbe\u5907\u6587\u4ef6：\u6709 write \u51fd\u6570\u6307\u9488<\/span>
    \n if<\/span> (<\/span>f-><\/span>write !=<\/span> NULL<\/span>)<\/span> {<\/span>
    \n size_t<\/span> w =<\/span> f-><\/span>write<\/span>(<\/span>buf,<\/span> f-><\/span>open_offset,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> w;<\/span>
    \n return<\/span> w;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u666e\u901a\u6587\u4ef6（ramdisk）<\/span>
    \n if<\/span> (<\/span>f-><\/span>open_offset >=<\/span> f-><\/span>size)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    size_t<\/span> remain =<\/span> f-><\/span>size –<\/span> f-><\/span>open_offset;<\/span>
    \n if<\/span> (<\/span>len ><\/span> remain)<\/span>
    \n len =<\/span> remain;<\/span><\/p>\n

    size_t<\/span> disk_off =<\/span> f-><\/span>disk_offset +<\/span> f-><\/span>open_offset;<\/span>
    \n size_t<\/span> w =<\/span> ramdisk_write<\/span>(<\/span>buf,<\/span> disk_off,<\/span> len)<\/span>;<\/span>
    \n f-><\/span>open_offset +=<\/span> w;<\/span>
    \n return<\/span> w;<\/span>
    \n}<\/span><\/p>\n

    \u64cd\u4f5c\u7cfb\u7edf\u4e4b\u4e0a\u7684IOE<\/h2>\n

    \u628a\u4e32\u53e3\u62bd\u8c61\u6210\u6587\u4ef6<\/h3>\n

    size_t<\/span> serial_write<\/span>(<\/span>const<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> offset,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n const<\/span> char<\/span> *<\/span>p =<\/span> (<\/span>const<\/span> char<\/span> *<\/span>)<\/span>buf;<\/span>
    \n for<\/span> (<\/span>size_t<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> len;<\/span> i++<\/span>)<\/span>
    \n putch<\/span>(<\/span>p[<\/span>i]<\/span>)<\/span>;<\/span>
    \n return<\/span> len;<\/span>
    \n}<\/span><\/p>\n

    \u5b9e\u73b0gettimeofday<\/h3>\n

    \u5728 Nanos-lite \u4e2d\u5b83\u901a\u8fc7 SYS_gettimeofday \u2192 AM_TIMER_UPTIME \u5b9e\u73b0，
    \n\u672c\u8d28\u662f\u628a AM \u63d0\u4f9b\u7684\u65f6\u95f4\u8bfb\u51fa\u6765，\u5305\u88c5\u6210\u6807\u51c6 Unix \u63a5\u53e3<\/p>\n

    \/\/ nanos-lite\/src\/syscall.c\/do_syscall()<\/span>
    \n case<\/span> SYS_gettimeofday:<\/span> {<\/span>
    \n struct<\/span> timeval<\/span> *<\/span>tv =<\/span> (<\/span>struct<\/span> timeval<\/span> *<\/span>)<\/span>(<\/span>uintptr_t<\/span>)<\/span>a[<\/span>1<\/span>]<\/span>;<\/span>
    \n AM_TIMER_UPTIME_T uptime;<\/span>
    \n ioe_read<\/span>(<\/span>AM_TIMER_UPTIME,<\/span> &<\/span>uptime)<\/span>;<\/span>
    \n if<\/span> (<\/span>tv)<\/span> {<\/span>
    \n tv-><\/span>tv_sec =<\/span> uptime.<\/span>us \/<\/span> 1000000<\/span>;<\/span>
    \n tv-><\/span>tv_usec =<\/span> uptime.<\/span>us %<\/span> 1000000<\/span>;<\/span>
    \n }<\/span>
    \n ret =<\/span> 0<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/ navy-apps\/libs\/libos\/src\/syscall.c<\/span>
    \nint<\/span> _gettimeofday<\/span>(<\/span>struct<\/span> timeval<\/span> *<\/span>tv,<\/span> struct<\/span> timezone<\/span> *<\/span>tz)<\/span> {<\/span>
    \n return<\/span> _syscall_<\/span>(<\/span>SYS_gettimeofday,<\/span> (<\/span>intptr_t<\/span>)<\/span>tv,<\/span> (<\/span>intptr_t<\/span>)<\/span>tz,<\/span> 0<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \/\/ navy-apps\/tests\/timer-test\/main.c<\/span>
    \n#<\/span>include<\/span> <stdio.h><\/span><\/span>
    \n#<\/span>include<\/span> <sys\/time.h><\/span><\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
    \n struct<\/span> timeval<\/span> last,<\/span> now;<\/span>
    \n gettimeofday<\/span>(<\/span>&<\/span>last,<\/span> NULL<\/span>)<\/span>;<\/span>
    \n while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \n gettimeofday<\/span>(<\/span>&<\/span>now,<\/span> NULL<\/span>)<\/span>;<\/span>
    \n long<\/span> diff_us =<\/span> (<\/span>now.<\/span>tv_sec –<\/span> last.<\/span>tv_sec)<\/span> *<\/span> 1000000L<\/span> +<\/span> (<\/span>now.<\/span>tv_usec –<\/span> last.<\/span>tv_usec)<\/span>;<\/span>
    \n if<\/span> (<\/span>diff_us >=<\/span> 500000<\/span>)<\/span> {<\/span> \/\/ 0.5 \u79d2<\/span>
    \n printf<\/span>(<\/span>"0.5 second passed!\\\\n"<\/span>)<\/span>;<\/span>
    \n last =<\/span> now;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8f93\u51fa：
    \n\"\"<\/p>\n

    \u5b9e\u73b0NDL\u7684\u65f6\u949f<\/h3>\n

    \u53ea\u9700\u8981\u5728 NDL_GetTicks() \u4e2d\u8c03\u7528 gettimeofday() \u5c31\u884c\u3002<\/p>\n

    \/\/ navy-apps\/libs\/libndl\/NDL.c<\/span>
    \n#<\/span>include<\/span> <sys\/time.h><\/span><\/span>
    \nuint32_t<\/span> NDL_GetTicks<\/span>(<\/span>)<\/span> {<\/span>
    \n struct<\/span> timeval<\/span> tv;<\/span>
    \n gettimeofday<\/span>(<\/span>&<\/span>tv,<\/span> NULL<\/span>)<\/span>;<\/span>
    \n uint64_t<\/span> ms =<\/span> (<\/span>uint64_t<\/span>)<\/span>tv.<\/span>tv_sec *<\/span> 1000<\/span> +<\/span> (<\/span>uint64_t<\/span>)<\/span>tv.<\/span>tv_usec \/<\/span> 1000<\/span>;<\/span>
    \n return<\/span> (<\/span>uint32_t<\/span>)<\/span>ms;<\/span>
    \n}<\/span><\/p>\n

    \/\/ navy-apps\/tests\/timer-test\/main.c<\/span>
    \n#<\/span>include<\/span> <NDL.h><\/span><\/span>
    \n#<\/span>include<\/span> <stdio.h><\/span><\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
    \n NDL_Init<\/span>(<\/span>0<\/span>)<\/span>;<\/span>
    \n uint32_t<\/span> last =<\/span> NDL_GetTicks<\/span>(<\/span>)<\/span>;<\/span>
    \n while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \n uint32_t<\/span> now =<\/span> NDL_GetTicks<\/span>(<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>(<\/span>uint32_t<\/span>)<\/span>(<\/span>now –<\/span> last)<\/span> >=<\/span> 500<\/span>)<\/span> {<\/span> \/\/ 0.5s = 500ms，\u5904\u7406\u56de\u7ed5\u7528\u65e0\u7b26\u53f7\u5dee\u503c<\/span>
    \n printf<\/span>(<\/span>"0.5 second passed!\\\\n"<\/span>)<\/span>;<\/span>
    \n last =<\/span> now;<\/span>
    \n }<\/span>
    \n }<\/span>
    \n NDL_Quit<\/span>(<\/span>)<\/span>;<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8f93\u51fa\u7167\u65e7\u3002<\/p>\n

    \u628a\u6309\u952e\u8f93\u5165\u62bd\u8c61\u6210\u6587\u4ef6<\/h3>\n

    \u5b9e\u73b0events_read()(\u5728nanos-lite\/src\/device.c\u4e2d\u5b9a\u4e49)<\/p>\n

    size_t<\/span> events_read<\/span>(<\/span>void<\/span> *<\/span>buf,<\/span> size_t<\/span> offset,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n (<\/span>void<\/span>)<\/span>offset;<\/span> \/\/ \u5b57\u7b26\u8bbe\u5907\u4e0d\u9700\u8981 offset<\/span><\/p>\n

    AM_INPUT_KEYBRD_T ev =<\/span> io_read<\/span>(<\/span>AM_INPUT_KEYBRD)<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>ev.<\/span>keycode ==<\/span> AM_KEY_NONE)<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n const<\/span> char<\/span> *<\/span>name =<\/span> keyname[<\/span>ev.<\/span>keycode]<\/span>;<\/span>
    \n if<\/span> (<\/span>name ==<\/span> NULL<\/span>)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    \/\/ kd \/ ku + \u7a7a\u683c + NAME + \\\\n<\/span>
    \n int<\/span> n =<\/span> snprintf<\/span>(<\/span>(<\/span>char<\/span> *<\/span>)<\/span>buf,<\/span> len,<\/span> "%s %s\\\\n"<\/span>,<\/span> ev.<\/span>keydown ?<\/span> "kd"<\/span> :<\/span> "ku"<\/span>,<\/span> name)<\/span>;<\/span>
    \n if<\/span> (<\/span>n <<\/span> 0<\/span>)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    if<\/span> (<\/span>(<\/span>size_t<\/span>)<\/span>n >=<\/span> len)<\/span>
    \n return<\/span> len –<\/span> 1<\/span>;<\/span>
    \n return<\/span> (<\/span>size_t<\/span>)<\/span>n;<\/span>
    \n}<\/span><\/p>\n

    \u5728VFS\u4e2d\u6dfb\u52a0\u5bf9\/dev\/events\u7684\u652f\u6301<\/p>\n

    enum<\/span> {<\/span> FD_STDIN,<\/span> FD_STDOUT,<\/span> FD_STDERR,<\/span> FD_EVENTS,<\/span> FD_FB }<\/span>;<\/span><\/p>\n

    static<\/span> Finfo file_table[<\/span>]<\/span> __attribute__<\/span>(<\/span>(<\/span>used)<\/span>)<\/span> =<\/span> {<\/span>
    \n [<\/span>FD_STDIN]<\/span> =<\/span> {<\/span>"stdin"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> invalid_write}<\/span>,<\/span>
    \n [<\/span>FD_STDOUT]<\/span> =<\/span> {<\/span>"stdout"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n [<\/span>FD_STDERR]<\/span> =<\/span> {<\/span>"stderr"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n [<\/span>FD_EVENTS]<\/span> =<\/span> {<\/span>"\/dev\/events"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> events_read,<\/span> invalid_write}<\/span>,<\/span>
    \n#<\/span>include<\/span> "files.h"<\/span><\/span>
    \n}<\/span>;<\/span><\/p>\n

    \u5728NDL\u4e2d\u5b9e\u73b0NDL_PollEvent(), \u4ece\/dev\/events\u4e2d\u8bfb\u51fa\u4e8b\u4ef6\u5e76\u5199\u5165\u5230buf\u4e2d.<\/p>\n

    int<\/span> NDL_Init<\/span>(<\/span>uint32_t<\/span> flags)<\/span> {<\/span>
    \n if<\/span> (<\/span>getenv<\/span>(<\/span>"NWM_APP"<\/span>)<\/span>)<\/span> {<\/span>
    \n evtdev =<\/span> 3<\/span>;<\/span>
    \n }<\/span> else<\/span> {<\/span>
    \n \/\/ open \u6210\u529f\u8fd4\u56de\u975e\u8d1f\u6574\u6570(\u6587\u4ef6\u53e5\u67c4)，\u5931\u8d25\u8fd4\u56de-1<\/span>
    \n evtdev =<\/span> open<\/span>(<\/span>"\/dev\/events"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    int<\/span> NDL_PollEvent<\/span>(<\/span>char<\/span> *<\/span>buf,<\/span> int<\/span> len)<\/span> {<\/span>
    \n if<\/span> (<\/span>evtdev <<\/span> 0<\/span>)<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n int<\/span> n =<\/span> read<\/span>(<\/span>evtdev,<\/span> buf,<\/span> len)<\/span>;<\/span>
    \n return<\/span> (<\/span>n ><\/span> 0<\/span>)<\/span> ?<\/span> 1<\/span> :<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8f93\u51fa：
    \n\"\"
    \n\u5206\u6790：\u6bcf\u53e5\u8f93\u51fa\u4e4b\u95f4\u7a7a\u4e00\u884c\u662f\u56e0\u4e3abuff\u91cc\u81ea\u5e26\\\\n（\u4e00\u4e2a\u4e8b\u4ef6\u4ee5\u6362\u884c\u7b26\\\\n\u7ed3\u675f），\u800cnavy-apps\/tests\/event-test\/main.c\u7684printf\u53c8\u6709\\\\n<\/p>\n

    while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \n char<\/span> buf[<\/span>64<\/span>]<\/span>;<\/span>
    \n if<\/span> (<\/span>NDL_PollEvent<\/span>(<\/span>buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span>)<\/span>)<\/span> {<\/span>
    \n printf<\/span>(<\/span>"receive event: %s\\\\n"<\/span>,<\/span> buf)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    \u5728NDL\u4e2d\u83b7\u53d6\u5c4f\u5e55\u5927\u5c0f<\/h3>\n

    (1)\u5b9e\u73b0dispinfo_read()(\u6211\u4eec\u8ba4\u4e3a\u8fd9\u4e2a\u6587\u4ef6\u4e0d\u652f\u6301lseek, \u53ef\u5ffd\u7565offset,\u4e0d\u8fc7\u6211\u8fd9\u91cc\u8003\u8651\u4e86\u591a\u6b21\u8fde\u7740\u8bfb).<\/p>\n

    size_t<\/span> dispinfo_read<\/span>(<\/span>void<\/span> *<\/span>buf,<\/span> size_t<\/span> offset,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n AM_GPU_CONFIG_T cfg =<\/span> io_read<\/span>(<\/span>AM_GPU_CONFIG)<\/span>;<\/span><\/p>\n

    char<\/span> info[<\/span>64<\/span>]<\/span>;<\/span>
    \n int<\/span> n =<\/span> snprintf<\/span>(<\/span>info,<\/span> sizeof<\/span>(<\/span>info)<\/span>,<\/span> "WIDTH : %d\\\\nHEIGHT:%d\\\\n"<\/span>,<\/span> cfg.<\/span>width,<\/span>
    \n cfg.<\/span>height)<\/span>;<\/span>
    \n if<\/span> (<\/span>n <<\/span> 0<\/span>)<\/span>
    \n return<\/span> 0<\/span>;<\/span><\/p>\n

    \/\/ \u6309\u201c\u6587\u4ef6\u201d\u8bed\u4e49\u88c1\u526a<\/span>
    \n size_t<\/span> size =<\/span> (<\/span>size_t<\/span>)<\/span>n;<\/span>
    \n if<\/span> (<\/span>offset >=<\/span> size)<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n if<\/span> (<\/span>len ><\/span> size –<\/span> offset)<\/span>
    \n len =<\/span> size –<\/span> offset;<\/span><\/p>\n

    memcpy<\/span>(<\/span>buf,<\/span> info +<\/span> offset,<\/span> len)<\/span>;<\/span>
    \n return<\/span> len;<\/span>
    \n}<\/span><\/p>\n

    (2)\u5728NDL\u4e2d\u8bfb\u51fa\u8fd9\u4e2a\u6587\u4ef6\u7684\u5185\u5bb9, \u4ece\u4e2d\u89e3\u6790\u51fa\u5c4f\u5e55\u5927\u5c0f：NDL_Init\u65f6\u505a<\/p>\n

    int<\/span> NDL_Init<\/span>(<\/span>uint32_t<\/span> flags)<\/span> {<\/span>
    \n if<\/span> (<\/span>getenv<\/span>(<\/span>"NWM_APP"<\/span>)<\/span>)<\/span> {<\/span>
    \n evtdev =<\/span> 3<\/span>;<\/span>
    \n }<\/span> else<\/span> {<\/span>
    \n \/\/ open \u6210\u529f\u8fd4\u56de\u975e\u8d1f\u6574\u6570(\u6587\u4ef6\u53e5\u67c4)，\u5931\u8d25\u8fd4\u56de-1<\/span>
    \n evtdev =<\/span> open<\/span>(<\/span>"\/dev\/events"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    int<\/span> fd =<\/span> open<\/span>(<\/span>"\/proc\/dispinfo"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span>
    \n char<\/span> buf[<\/span>128<\/span>]<\/span> =<\/span> {<\/span>0<\/span>}<\/span>;<\/span>
    \n int<\/span> n =<\/span> read<\/span>(<\/span>fd,<\/span> buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span> –<\/span> 1<\/span>)<\/span>;<\/span>
    \n close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

    \/\/ \u6309 README \u7684\u683c\u5f0f\u89e3\u6790<\/span>
    \n int<\/span> w =<\/span> 0<\/span>,<\/span> h =<\/span> 0<\/span>;<\/span>
    \n sscanf<\/span>(<\/span>buf,<\/span> "WIDTH : %d\\\\nHEIGHT:%d\\\\n"<\/span>,<\/span> &<\/span>w,<\/span> &<\/span>h)<\/span>;<\/span>
    \n screen_w =<\/span> w;<\/span>
    \n screen_h =<\/span> h;<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n}<\/span><\/p>\n

    (3)\u5b9e\u73b0NDL_OpenCanvas()\u7684\u529f\u80fd:
    \n\u76ee\u524dNDL_OpenCanvas()\u53ea\u9700\u8981\u8bb0\u5f55\u753b\u5e03\u7684\u5927\u5c0f，\u5177\u4f53\u53c2\u8003\u4e0b\u6587\u3002
    \n(4)\u4e0d\u8981\u5fd8\u4e86\u628a \/proc\/dispinfo \u52a0\u8fdb file_table，\u8fd9\u662f\u628aVGA\u6587\u4ef6\u5316\u7684\u524d\u63d0<\/p>\n

    \/\/ FD = File Descriptor; FB = Frame Buffer<\/span>
    \nenum<\/span> {<\/span> FD_STDIN,<\/span> FD_STDOUT,<\/span> FD_STDERR,<\/span> FD_EVENTS,<\/span> FD_DISPINFO,<\/span> FD_FB }<\/span>;<\/span><\/p>\n

    \/* This is the information about all files in disk. *\/<\/span>
    \nstatic<\/span> Finfo file_table[<\/span>]<\/span> __attribute__<\/span>(<\/span>(<\/span>used)<\/span>)<\/span> =<\/span> {<\/span>
    \n [<\/span>FD_STDIN]<\/span> =<\/span> {<\/span>"stdin"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> invalid_write}<\/span>,<\/span>
    \n [<\/span>FD_STDOUT]<\/span> =<\/span> {<\/span>"stdout"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n [<\/span>FD_STDERR]<\/span> =<\/span> {<\/span>"stderr"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> invalid_read,<\/span> serial_write}<\/span>,<\/span>
    \n [<\/span>FD_EVENTS]<\/span> =<\/span> {<\/span>"\/dev\/events"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> events_read,<\/span> invalid_write}<\/span>,<\/span>
    \n [<\/span>FD_DISPINFO]<\/span> =<\/span> {<\/span>"\/proc\/dispinfo"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> dispinfo_read,<\/span> invalid_write}<\/span>,<\/span>
    \n#<\/span>include<\/span> "files.h"<\/span><\/span>
    \n}<\/span>;<\/span><\/p>\n

    \u628aVGA\u663e\u5b58\u62bd\u8c61\u6210\u6587\u4ef6<\/h3>\n

    (1)\u5728init_fs()\u4e2d\u5bf9\u6587\u4ef6\u8bb0\u5f55\u8868\u4e2d\/dev\/fb\u7684\u5927\u5c0f\u8fdb\u884c\u521d\u59cb\u5316.<\/p>\n

    void<\/span> init_fs<\/span>(<\/span>)<\/span> {<\/span>
    \n AM_GPU_CONFIG_T cfg =<\/span> io_read<\/span>(<\/span>AM_GPU_CONFIG)<\/span>;<\/span>
    \n file_table[<\/span>FD_FB]<\/span>.<\/span>size =<\/span> cfg.<\/span>width *<\/span> cfg.<\/span>height *<\/span> 4<\/span>;<\/span>
    \n}<\/span><\/p>\n

    (2)\u5b9e\u73b0fb_write(), \u7528\u4e8e\u628abuf\u4e2d\u7684len\u5b57\u8282\u5199\u5230\u5c4f\u5e55\u4e0aoffset\u5904.<\/p>\n

    size_t<\/span> fb_write<\/span>(<\/span>const<\/span> void<\/span> *<\/span>buf,<\/span> size_t<\/span> offset,<\/span> size_t<\/span> len)<\/span> {<\/span>
    \n AM_GPU_CONFIG_T cfg =<\/span> io_read<\/span>(<\/span>AM_GPU_CONFIG)<\/span>;<\/span>
    \n size_t<\/span> W =<\/span> (<\/span>size_t<\/span>)<\/span>cfg.<\/span>width;<\/span><\/p>\n

    \/\/ \u50cf\u7d20\u5bf9\u9f50<\/span>
    \n if<\/span> (<\/span>offset %<\/span> 4<\/span> !=<\/span> 0<\/span>)<\/span>
    \n return<\/span> 0<\/span>;<\/span>
    \n len =<\/span> (<\/span>len \/<\/span> 4<\/span>)<\/span> *<\/span> 4<\/span>;<\/span> \/\/ \u5411\u4e0b\u53d6\u6574\u52304\u7684\u500d\u6570<\/span><\/p>\n

    const<\/span> uint8_t<\/span> *<\/span>p =<\/span> (<\/span>const<\/span> uint8_t<\/span> *<\/span>)<\/span>buf;<\/span>
    \n size_t<\/span> left =<\/span> len;<\/span><\/p>\n

    while<\/span> (<\/span>left ><\/span> 0<\/span>)<\/span> {<\/span>
    \n size_t<\/span> pix =<\/span> offset \/<\/span> 4<\/span>;<\/span>
    \n size_t<\/span> x =<\/span> pix %<\/span> W;<\/span>
    \n size_t<\/span> y =<\/span> pix \/<\/span> W;<\/span><\/p>\n

    \/\/ \u5f53\u524d\u884c\u8fd8\u5269\u591a\u5c11\u50cf\u7d20<\/span>
    \n size_t<\/span> row_left_pixels =<\/span> W –<\/span> x;<\/span><\/p>\n

    \/\/ \u8fd9\u6b21\u6700\u591a\u5199\u591a\u5c11\u5b57\u8282（\u4e0d\u8de8\u884c）<\/span>
    \n size_t<\/span> chunk =<\/span> row_left_pixels *<\/span> 4<\/span>;<\/span>
    \n if<\/span> (<\/span>chunk ><\/span> left)<\/span>
    \n chunk =<\/span> left;<\/span><\/p>\n

    int<\/span> draw_w =<\/span> (<\/span>int<\/span>)<\/span>(<\/span>chunk \/<\/span> 4<\/span>)<\/span>;<\/span>
    \n int<\/span> draw_h =<\/span> 1<\/span>;<\/span>
    \n \/\/bool sync = (chunk == left); \/\/ \u6700\u540e\u4e00\u5757\u624dsync<\/span>
    \n bool sync =<\/span> true;<\/span> \/\/ \u6bcf\u6b21\u7ed8\u56fe\u540e\u603b\u662f\u9a6c\u4e0a\u540c\u6b65<\/span><\/p>\n

    io_write<\/span>(<\/span>AM_GPU_FBDRAW,<\/span> (<\/span>int<\/span>)<\/span>x,<\/span> (<\/span>int<\/span>)<\/span>y,<\/span> (<\/span>void<\/span> *<\/span>)<\/span>p,<\/span> draw_w,<\/span> draw_h,<\/span> sync)<\/span>;<\/span><\/p>\n

    p +=<\/span> chunk;<\/span>
    \n offset +=<\/span> chunk;<\/span>
    \n left -=<\/span> chunk;<\/span>
    \n }<\/span><\/p>\n

    return<\/span> len;<\/span>
    \n}<\/span><\/p>\n

    (3)\u5728NDL\u4e2d\u5b9e\u73b0NDL_DrawRect(), \u901a\u8fc7\u5f80\/dev\/fb\u4e2d\u7684\u6b63\u786e\u4f4d\u7f6e\u5199\u5165\u50cf\u7d20\u4fe1\u606f\u6765\u7ed8\u5236\u56fe\u50cf.<\/p>\n

    void<\/span> NDL_OpenCanvas<\/span>(<\/span>int<\/span> *<\/span>w,<\/span> int<\/span> *<\/span>h)<\/span> {<\/span>
    \n if<\/span> (<\/span>getenv<\/span>(<\/span>"NWM_APP"<\/span>)<\/span>)<\/span> {<\/span>
    \n int<\/span> fbctl =<\/span> 4<\/span>;<\/span>
    \n fbdev =<\/span> 5<\/span>;<\/span>
    \n screen_w =<\/span> *<\/span>w;<\/span> screen_h =<\/span> *<\/span>h;<\/span>
    \n char<\/span> buf[<\/span>64<\/span>]<\/span>;<\/span>
    \n int<\/span> len =<\/span> sprintf<\/span>(<\/span>buf,<\/span> "%d %d"<\/span>,<\/span> screen_w,<\/span> screen_h)<\/span>;<\/span>
    \n \/\/ let NWM resize the window and create the frame buffer<\/span>
    \n write<\/span>(<\/span>fbctl,<\/span> buf,<\/span> len)<\/span>;<\/span>
    \n while<\/span> (<\/span>1<\/span>)<\/span> {<\/span>
    \n \/\/ 3 = evtdev<\/span>
    \n int<\/span> nread =<\/span> read<\/span>(<\/span>3<\/span>,<\/span> buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span> –<\/span> 1<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>nread <=<\/span> 0<\/span>)<\/span> continue<\/span>;<\/span>
    \n buf[<\/span>nread]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
    \n if<\/span> (<\/span>strcmp<\/span>(<\/span>buf,<\/span> "mmap ok"<\/span>)<\/span> ==<\/span> 0<\/span>)<\/span> break<\/span>;<\/span>
    \n }<\/span>
    \n close<\/span>(<\/span>fbctl)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u6253\u5f00 \/dev\/fb（\u53ea\u505a\u4e00\u6b21）<\/span>
    \n if<\/span> (<\/span>fbdev <<\/span> 0<\/span>)<\/span>
    \n fbdev =<\/span> open<\/span>(<\/span>"\/dev\/fb"<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ *w=*h=0 \u8868\u793a\u5168\u5c4f<\/span>
    \n if<\/span> (<\/span>*<\/span>w ==<\/span> 0<\/span> &&<\/span> *<\/span>h ==<\/span> 0<\/span>)<\/span> {<\/span>
    \n *<\/span>w =<\/span> screen_w;<\/span>
    \n *<\/span>h =<\/span> screen_h;<\/span>
    \n }<\/span><\/p>\n

    assert<\/span>(<\/span>*<\/span>w <=<\/span> screen_w &&<\/span> *<\/span>h <=<\/span> screen_h)<\/span>;<\/span><\/p>\n

    \/\/ \u5c45\u4e2d\u8d34（\u4e5f\u53ef\u4ee5\u6539\u6210 0,0 \u5de6\u4e0a\u89d2\u8d34）<\/span>
    \n canvas_x =<\/span> (<\/span>screen_w –<\/span> *<\/span>w)<\/span> \/<\/span> 2<\/span>;<\/span>
    \n canvas_y =<\/span> (<\/span>screen_h –<\/span> *<\/span>h)<\/span> \/<\/span> 2<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \/\/ \u5411\u753b\u5e03`(x, y)`\u5750\u6807\u5904\u7ed8\u5236`w*h`\u7684\u77e9\u5f62\u56fe\u50cf, \u5e76\u5c06\u8be5\u7ed8\u5236\u533a\u57df\u540c\u6b65\u5230\u5c4f\u5e55\u4e0a<\/span>
    \n\/\/ \u56fe\u50cf\u50cf\u7d20\u6309\u884c\u4f18\u5148\u65b9\u5f0f\u5b58\u50a8\u5728`pixels`\u4e2d,<\/span>
    \n\/\/ \u6bcf\u4e2a\u50cf\u7d20\u752832\u4f4d\u6574\u6570\u4ee5`00RRGGBB`\u7684\u65b9\u5f0f\u63cf\u8ff0\u989c\u8272<\/span>
    \nvoid<\/span> NDL_DrawRect<\/span>(<\/span>uint32_t<\/span> *<\/span>pixels,<\/span> int<\/span> x,<\/span> int<\/span> y,<\/span> int<\/span> w,<\/span> int<\/span> h)<\/span> {<\/span>
    \n if<\/span> (<\/span>fbdev <<\/span> 0<\/span>)<\/span>
    \n return<\/span>;<\/span><\/p>\n

    int<\/span> sx =<\/span> canvas_x +<\/span> x;<\/span>
    \n int<\/span> sy =<\/span> canvas_y +<\/span> y;<\/span><\/p>\n

    for<\/span> (<\/span>int<\/span> row =<\/span> 0<\/span>;<\/span> row <<\/span> h;<\/span> row++<\/span>)<\/span> {<\/span>
    \n off_t<\/span> off =<\/span> (<\/span>(<\/span>off_t<\/span>)<\/span>(<\/span>sy +<\/span> row)<\/span> *<\/span> screen_w +<\/span> sx)<\/span> *<\/span> 4<\/span>;<\/span>
    \n lseek<\/span>(<\/span>fbdev,<\/span> off,<\/span> SEEK_SET<\/span>)<\/span>;<\/span>
    \n write<\/span>(<\/span>fbdev,<\/span> pixels +<\/span> row *<\/span> w,<\/span> (<\/span>size_t<\/span>)<\/span>w *<\/span> 4<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    (4)\u628a \/dev\/fb \u52a0\u8fdb file_table
    \n\u7c7b\u4f3c\/proc\/dispinfo<\/p>\n

    \u8f93\u51fa：
    \n\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u6587\u7ae0\u4e3a\u672c\u4eba\u81ea\u5b66\u8bb0\u5f55\u7684\u5206\u4eab（\u975eNJU\u5b66\u751f），\u4ee3\u7801\u4e0d\u4fdd\u8bc1\u6b63\u786e，\u5982\u679c\u4f60\u662fNJU\u7684\u8be5\u5b9e\u9a8c\u8bfe\u5b66\u5458\u6216\u8005YSYX\u7684A\u9636\u6bb5\u5b66\u5458，\u8bf7\u81ea\u89c9\u9075\u5b88\u5b66\u672f\u8bda\u4fe1\u3002\u5982\u679c\u672c\u6587\u9020\u6210\u4e0d\u826f\u5f71\u54cd\u8bf7\u8054\u7cfb\u6211\u64a4\u56de\u3002\u5b9e\u9a8c\u4e3a\u5357\u4eac\u5927\u5b66 \u8ba1\u7b97\u673a\u79d1\u5b66\u4e0e\u6280\u672f\u7cfb \u8ba1\u7b97\u673a\u7cfb\u7edf\u57fa\u7840 \u8bfe\u7a0b\u5b9e\u9a8c\u3002\u5b9e\u9a8c\u6587\u6863：https:\/\/ysyx.oscc.cc\/docs\/ics-pa\/\u3002\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf
    \n\u5173\u952e\u5b9e\u73b0
    \n\u8981\u505a\u7684\u4e8b\u60c5\u53ef\u4ee5\u62c6\u6210\u4e09\u5757：\u7528\u6237\u6001（lib<\/p>\n","protected":false},"author":2,"featured_media":69957,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,58],"topic":[],"class_list":["post-69961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-c","tag-linux"],"yoast_head":"\nPA3\u4e4b\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/69961.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PA3\u4e4b\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u4e3a\u672c\u4eba\u81ea\u5b66\u8bb0\u5f55\u7684\u5206\u4eab（\u975eNJU\u5b66\u751f），\u4ee3\u7801\u4e0d\u4fdd\u8bc1\u6b63\u786e，\u5982\u679c\u4f60\u662fNJU\u7684\u8be5\u5b9e\u9a8c\u8bfe\u5b66\u5458\u6216\u8005YSYX\u7684A\u9636\u6bb5\u5b66\u5458，\u8bf7\u81ea\u89c9\u9075\u5b88\u5b66\u672f\u8bda\u4fe1\u3002\u5982\u679c\u672c\u6587\u9020\u6210\u4e0d\u826f\u5f71\u54cd\u8bf7\u8054\u7cfb\u6211\u64a4\u56de\u3002\u5b9e\u9a8c\u4e3a\u5357\u4eac\u5927\u5b66 \u8ba1\u7b97\u673a\u79d1\u5b66\u4e0e\u6280\u672f\u7cfb \u8ba1\u7b97\u673a\u7cfb\u7edf\u57fa\u7840 \u8bfe\u7a0b\u5b9e\u9a8c\u3002\u5b9e\u9a8c\u6587\u6863：https:\/\/ysyx.oscc.cc\/docs\/ics-pa\/\u3002\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf \u5173\u952e\u5b9e\u73b0 \u8981\u505a\u7684\u4e8b\u60c5\u53ef\u4ee5\u62c6\u6210\u4e09\u5757：\u7528\u6237\u6001（lib\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/69961.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-01T00:49:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201004857-697ea2f9ec148.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/69961.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/69961.html\",\"name\":\"PA3\u4e4b\u7b80\u6613\u6587\u4ef6\u7cfb\u7edf - 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