RTEMS CPU Architecture Supplement
Microprocessors are generally classified into families with a variety of CPU models or implementations within that family. Within a processor family, there is a high level of binary compatibility. This family may be based on either an architectural specification or on maintaining compatibility with a popular processor. Recent microprocessor families such as the SPARC or PowerPC are based on an architectural specification which is independent or any particular CPU model or implementation. Older families such as the M68xxx and the iX86 evolved as the manufacturer strived to produce higher performance processor models which maintained binary compatibility with older models.
RTEMS takes advantage of the similarity of the various models within a CPU family. Although the models do vary in significant ways, the high level of compatibility makes it possible to share the bulk of the CPU dependent executive code across the entire family.
RTEMS CPU Architecture Supplement
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