x86/insn-eval: Extend get_seg_base_addr() to also obtain segment limit

In protected mode, it is common to want to obtain the limit of a segment
along with its base address. This is useful, for instance, to verify that
an effective address lies within a segment before computing a linear
address.

Up to this point, this library only computes linear addresses in long
mode. Subsequent patches will include support for protected mode. Support
to verify the segment limit will be needed.

Signed-off-by: Ricardo Neri <[email protected]>
Cc: Adam Buchbinder <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Chen Yucong <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Huang Rui <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Qiaowei Ren <[email protected]>
Cc: Ravi V. Shankar <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Thomas Garnier <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/1509148310-30862-2-git-send-email-ricardo.neri-calderon@linux.intel.com
Signed-off-by: Ingo Molnar <[email protected]>

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