Linux Certif

Toute la documentation sur la certification Linux LPI

mem

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mem, kmem, port - ¥·¥¹¥Æ¥à¥á¥â¥ê(system memory)¡¢¥«¡¼¥Í¥ë¥á¥â¥ê (kernel memory)¡¢¥·¥¹¥Æ¥à¥Ý¡¼¥È(sysmem ports)

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mem ¤Ï¥³¥ó¥Ô¥å¡¼¥¿¤Î¥á¥¤¥ó¥á¥â¥ê¥¤¥á¡¼¥¸¤Î¥­¥ã¥é¥¯¥¿¡¼¥Ç¥Ð¥¤¥¹¥Õ¥¡ ¥¤¥ë(character device file)¤Ç¤¢¤ë¡£¤³¤Î¥Ç¥Ð¥¤¥¹¤Ï¡¢Î㤨¤Ð¡¢¥·¥¹¥Æ¥à¤ò ¸¡ºº¤¹¤ë¤¿¤á(¤Þ¤¿¡¢¥Ñ¥Ã¥Á(patch)¤ò¤¢¤Æ¤ë¤¿¤á)¤Ë»È¤ï¤ì¤ë¤À¤í¤¦¡£

mem ¤Î¥Ð¥¤¥È¥¢¥É¥ì¥¹(byte address)¤Ï ʪÍý¥á¥â¥ê¥¢¥É¥ì¥¹¤È¤·¤Æ²ò¼á¤µ¤ì¤ë¡£ ¸ºß¤·¤Æ¤¤¤Ê¤¤¾ì½ê¤Ø¤Î»²¾È¤Ï¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤ë¡£

Æɤ߹þ¤ßÀìÍÑ(read-only)¤¢¤ë¤¤¤Ï½ñ¤­¹þ¤ßÀìÍÑ(write-only)¤Î¥Ó¥Ã¥È¤Ø¤Î¸¡ ºº¤¢¤ë¤¤¤Ï¥Ñ¥Ã¥ÁÅö¤Æ¤Ïͽ´ü¤»¤Ì·ë²Ì¤ò¤â¤¿¤é¤¹¤³¤È¤¬¤¢¤ë¡£

¤³¤Î¥Ç¥Ð¥¤¥¹¥Õ¥¡¥¤¥ë¤Ïŵ·¿Åª¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Æºî¤é¤ì¤ë¡£:

mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem

kmem ¥Õ¥¡¥¤¥ë¤Ï mem ¤ÈƱ¤¸¤À¤¬¡¢ ʪÍý¥á¥â¥ê¤Ø¤Î¥¢¥¯¥»¥¹¤Ç¤Ï¤Ê¤¯¡¢¥«¡¼¥Í¥ë(kernel)¤Î²¾ÁÛ ¥á¥â¥ê(virtual memory)¤Ø¤Î¥¢¥¯¥»¥¹¤Ç¤¢¤ëÅÀ¤¬°Û¤Ê¤ë¡£

¤³¤Î¥Ç¥Ð¥¤¥¹¥Õ¥¡¥¤¥ë¤Ïŵ·¿Åª¤Ë¤Ï¼¡¤Î¤è¤¦¤Ë¤·¤Æºî¤é¤ì¤ë¡£:

mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem

port ¤Ï mem ¤Ë»÷¤Æ¤¤¤ë¤¬ I/O ¥Ý¡¼¥È(I/O ports)¤Ø¤Î¥¢¥¯¥»¥¹¤¬¹Ô¤ï¤ì¤ë¡£

¤³¤Î¥Ç¥Ð¥¤¥¹¥Õ¥¡¥¤¥ë¤Ïŵ·¿Åª¤Ë¤Ï¼¡¤Î¤è¤¦¤Ëºî¤é¤ì¤ë¡£:

mknod -m 660 /dev/port c 1 4
chown root:mem /dev/port

¥Õ¥¡¥¤¥ë

/dev/mem
/dev/kmem
/dev/port

´ØÏ¢¹àÌÜ

chown(1), mknod(1), ioperm(2)

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ÀÐÀî ËÓ <ishikawa@linux.or.jp>