MEM(4) | Kernel Interfaces Manual (HP700) | MEM(4) |
It also provides an interface to userland through the special files /dev/mem and /dev/kmem. Physical memory is accessed through /dev/mem, while kernel virtual memory is accessed through /dev/kmem. Access to kernel virtual addresses not currently mapped to memory will fail. On hp700, the physical memory range is always contiguous and starts at address 0; kernel virtual memory begins at address 0 as well.
The writeability of the /dev/mem and /dev/kmem special files are controlled by the system securelevel in addition to the filesystem permissions.
March 16, 2004 | NetBSD 6.0 |