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From: Andy Nolen-Parkhouse <aparkhouse@attbi.com> > I've had a long and successful career dealing with the IBM midrange and > have never heard of an MSR-bit One learns something new every day. The MSR is the central control point if you will of the entire machine. The acronym stands for Machine State Register. The MSR contains 64 bits. Each bit controlling a specific aspect at any one time. One bit determines if you are running in user or system state, another one if floating point is enabled, another one if virtual memory (address translation) is active, another one if big endian or little endian mode is in effect, if interrupt are enabled, if you are in 64- bit mode or 32-bit mode, if pointer tag bits are active, if power management is enabled, etc, etc.
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