mem(7) CLIX mem(7)
NAME
mem, kmem, odt - Core memory image
DESCRIPTION
The /dev/mem file is a special file that is an image of the core memory of
the computer. It may be used, for example, to examine and patch the
system.
Byte addresses in /dev/mem are interpreted as memory addresses. System
registers are not accessible through /dev/mem. References to nonexistent
locations cause errors.
The /dev/kmem file is the same as /dev/mem except that kernel virtual
memory rather than physical memory is accessed. System registers are not
accessible through /dev/kmem.
The /dev/odt file is the same as /dev/mem except that no checks are made
on the address for /dev/odt. This may result in accesses to system
registers or system nonexistent memory errors. Examining and patching
system registers is likely to lead to unexpected results.
The per-process data for the current process begins at 0xf0000000.
FILES
/dev/mem Interface to physical core memory.
/dev/kmem Interface to kernel virtual memory.
/dev/odt Interface to physical core memory with no address range
checking.
CAUTIONS
Since no range checking is performed for accesses to /dev/odt, it is
possible to panic the system with bad addresses.
2/94 - Intergraph Corporation 1