Documentation/x86/64: Add documentation for GS/FS addressing mode

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Explain how the GS/FS based addressing can be utilized in user space
applications along with the differences between the generic prctl() based
GS/FS base control and the FSGSBASE version available on newer CPUs.

Originally-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Bae, Chang Seok" <chang.seok.bae@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Cc: H . Peter Anvin <hpa@zytor.com>
Cc: "Shankar, Ravi V" <ravi.v.shankar@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1906132246310.1791@nanos.tec.linutronix.de

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Thomas Gleixner 2019-06-13 22:04:24 +03:00

parent f987c955c7

commit 2c7b5ac5d5

2 changed files with 200 additions and 0 deletions

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199

Documentation/x86/x86_64/fsgs.rst

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1

Documentation/x86/x86_64/index.rst

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