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Comment: delete kerneltrap.org URL (it's gone); use man page instead
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| http://kerneltrap.org/man/linux/man4/kmem.4 | * see `man 4 kmem` |
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| . memfP is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even patch) the system. Byte addresses in mem are interpreted as physical memory addresses. References to non-existent locations cause errors to be returned. Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present. It is typically created by: mknod -m 660 /dev/mem c 1 1 chown root:kmem /dev/mem The file kmem is the same as mem , except that the kernel virtual memory rather than physical memory is accessed. It is typically created by: mknod -m 640 /dev/kmem c 1 2 chown root:kmem /dev/kmem portfP is similar to mem , but the I/O ports are accessed. It is typically created by: mknod -m 660 /dev/port c 1 4 chown root:mem /dev/port | . It is typically created by: mknod -m 660 /dev/mem c 1 1 chown root:kmem /dev/mem The file kmem is the same as mem , except that the kernel virtual memory rather than physical memory is accessed. . . It is typically created by: mknod -m 640 /dev/kmem c 1 2 chown root:kmem /dev/kmem portfP is similar to mem , but the I/O ports are accessed. . . It is typically created by: mknod -m 660 /dev/port c 1 4 chown root:mem /dev/port |
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Here is how the kmem can be statically created:
see man 4 kmem
- It is typically created by: mknod -m 660 /dev/mem c 1 1 chown root:kmem /dev/mem The file kmem is the same as mem , except that the kernel virtual memory rather than physical memory is accessed.
- . It is typically created by: mknod -m 640 /dev/kmem c 1 2 chown root:kmem /dev/kmem portfP is similar to mem , but the I/O ports are accessed.
- . It is typically created by: mknod -m 660 /dev/port c 1 4 chown root:mem /dev/port
And here is the description on the difference between kmem and mem.