Em Fri, 26 Apr 2019 23:31:29 +0800
Changbin Du <changbin.du@xxxxxxxxx> escreveu:
> 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@xxxxxxxxx>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
> ---
> Documentation/x86/{entry_64.txt => entry_64.rst} | 12 +++++++++---
> Documentation/x86/index.rst | 1 +
> 2 files changed, 10 insertions(+), 3 deletions(-)
> rename Documentation/x86/{entry_64.txt => entry_64.rst} (95%)
>
> diff --git a/Documentation/x86/entry_64.txt b/Documentation/x86/entry_64.rst
> similarity index 95%
> rename from Documentation/x86/entry_64.txt
> rename to Documentation/x86/entry_64.rst
> index c1df8eba9dfd..a48b3f6ebbe8 100644
> --- a/Documentation/x86/entry_64.txt
> +++ b/Documentation/x86/entry_64.rst
> @@ -1,3 +1,9 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +==============
> +Kernel Entries
> +==============
> +
> This file documents some of the kernel entries in
> arch/x86/entry/entry_64.S. A lot of this explanation is adapted from
> an email from Ingo Molnar:
> @@ -59,7 +65,7 @@ Now, there's a secondary complication: there's a cheap way to test
> which mode the CPU is in and an expensive way.
>
> The cheap way is to pick this info off the entry frame on the kernel
> -stack, from the CS of the ptregs area of the kernel stack:
> +stack, from the CS of the ptregs area of the kernel stack::
>
> xorl %ebx,%ebx
> testl $3,CS+8(%rsp)
> @@ -67,7 +73,7 @@ stack, from the CS of the ptregs area of the kernel stack:
> SWAPGS
>
> The expensive (paranoid) way is to read back the MSR_GS_BASE value
> -(which is what SWAPGS modifies):
> +(which is what SWAPGS modifies)::
>
> movl $1,%ebx
> movl $MSR_GS_BASE,%ecx
> @@ -76,7 +82,7 @@ The expensive (paranoid) way is to read back the MSR_GS_BASE value
> js 1f /* negative -> in kernel */
> SWAPGS
> xorl %ebx,%ebx
> -1: ret
> + 1: ret
>
> If we are at an interrupt or user-trap/gate-alike boundary then we can
> use the faster check: the stack will be a reliable indicator of
> diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
> index 489f4f4179c4..8a666c5abc85 100644
> --- a/Documentation/x86/index.rst
> +++ b/Documentation/x86/index.rst
> @@ -12,3 +12,4 @@ Linux x86 Support
> topology
> exception-tables
> kernel-stacks
> + entry_64
Thanks,
Mauro
