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MEM
Section: Linux Programmer's Manual (4)Updated: 21 November 1992
Index Return to Main Contents
̾Á°
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)ÀâÌÀ
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:mem /dev/mem
kmem ¥Õ¥¡¥¤¥ë¤ÏʪÍý¥á¥â¥ê¤Ø¤Î¥¢¥¯¥»¥¹¤Ç¤Ï¤Ê¤¯¡¢¥«¡¼¥Í¥ë(kernel)¤Î²¾ÁÛ ¥á¥â¥ê(virtual memory)¤Ø¤Î¥¢¥¯¥»¥¹¤Ç¤¢¤ë¤³¤È¤ò½ü¤¤¤Æ¤Ï mem ¤ÈƱ¤¸¤Ç¤¢ ¤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:mem /dev/kmem
Port ¤Ï mem ¤Ë»÷¤Æ¤¤¤ë¤¬ IO ¥Ý¡¼¥È(IO 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
mknod(1), chown(1), ioperm(2)ËÝÌõ¼Ô
ÀÐÀî ËÓ <ishikawa@linux.or.jp>