Address space
address sp-ce
operating system, architecture
the range of addresses which a processor or process can access, or at which a device can be accessed. the term may refer to either physical address or virtual address.
the size of a processor’s address sp-ce depends on the width of the processor’s address bus and address registers.
each device, such as a memory integrated circuit, will have its own local address sp-ce which starts at zero. this will be mapped to a range of addresses which starts at some base address in the processor’s address sp-ce.
similarly, each process will have its own address sp-ce, which may be all or a part of the processor’s address sp-ce. in a mult-tasking system this may depend on where in memory the process happens to have been loaded. for a process to be able to run at any address it must consist of position-independent code. alternatively, each process may see the same local address sp-ce, with the memory management unit mapping this to the process’s own part of the processor’s address sp-ce.
(1999-11-01)
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