\ɐdɹˈɛs spˈe͡ɪs], \ɐdɹˈɛs spˈeɪs], \ɐ_d_ɹ_ˈɛ_s s_p_ˈeɪ_s]\
Definitions of ADDRESS SPACE
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The range of addresses whicha processor or process can access, or at which a device canbe accessed. The term may refer to either physical addressor virtual address.The size of a processor's address space depends on the widthof the processor's address bus and address registers.Each device, such as a memory integrated circuit, will haveits own local address space which starts at zero. This willbe mapped to a range of addresses which starts at some baseaddress in the processor's address space.Similarly, each process will have its own address space,which may be all or a part of the processor's address space.In a multitasking system this may depend on where in memorythe process happens to have been loaded. For a process to beable to run at any address it must consist ofposition-independent code. Alternatively, each process maysee the same local address space, with the memory managementunit mapping this to the process's own part of theprocessor's address space.
By Denis Howe
Word of the day
- Diaphthol, ortho-oxyquinoline-meta-sulphonic acid; light yellowish crystals, very slightly soluble cold water, antiseptic in 1 per cent. solution; recommended also internally as a urinary antiseptic.