Documentation: x86: convert entry_64.txt to reST
This converts the plain text documentation to reStructuredText format and add it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du <changbin.du@gmail.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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.. SPDX-License-Identifier: GPL-2.0
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==============
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Kernel Entries
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==============
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This file documents some of the kernel entries in
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arch/x86/entry/entry_64.S. A lot of this explanation is adapted from
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an email from Ingo Molnar:
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@ -59,7 +65,7 @@ Now, there's a secondary complication: there's a cheap way to test
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which mode the CPU is in and an expensive way.
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The cheap way is to pick this info off the entry frame on the kernel
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stack, from the CS of the ptregs area of the kernel stack:
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stack, from the CS of the ptregs area of the kernel stack::
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xorl %ebx,%ebx
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testl $3,CS+8(%rsp)
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@ -67,7 +73,7 @@ stack, from the CS of the ptregs area of the kernel stack:
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SWAPGS
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The expensive (paranoid) way is to read back the MSR_GS_BASE value
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(which is what SWAPGS modifies):
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(which is what SWAPGS modifies)::
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movl $1,%ebx
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movl $MSR_GS_BASE,%ecx
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@ -12,3 +12,4 @@ x86-specific Documentation
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topology
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exception-tables
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kernel-stacks
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entry_64
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