From: Changbin Du <changbin.du@gmail.com>
To: corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de
Cc: x86@kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Changbin Du <changbin.du@gmail.com>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Subject: [PATCH v3 16/27] Documentation: x86: convert microcode.txt to reST
Date: Tue, 7 May 2019 01:09:12 +0800 [thread overview]
Message-ID: <20190506170923.7117-17-changbin.du@gmail.com> (raw)
In-Reply-To: <20190506170923.7117-1-changbin.du@gmail.com>
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>
---
Documentation/x86/index.rst | 1 +
.../x86/{microcode.txt => microcode.rst} | 62 ++++++++++---------
2 files changed, 35 insertions(+), 28 deletions(-)
rename Documentation/x86/{microcode.txt => microcode.rst} (81%)
diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
index 6719defc16f8..ae29c026be72 100644
--- a/Documentation/x86/index.rst
+++ b/Documentation/x86/index.rst
@@ -22,3 +22,4 @@ x86-specific Documentation
intel_mpx
amd-memory-encryption
pti
+ microcode
diff --git a/Documentation/x86/microcode.txt b/Documentation/x86/microcode.rst
similarity index 81%
rename from Documentation/x86/microcode.txt
rename to Documentation/x86/microcode.rst
index 79fdb4a8148a..a320d37982ed 100644
--- a/Documentation/x86/microcode.txt
+++ b/Documentation/x86/microcode.rst
@@ -1,7 +1,11 @@
- The Linux Microcode Loader
+.. SPDX-License-Identifier: GPL-2.0
-Authors: Fenghua Yu <fenghua.yu@intel.com>
- Borislav Petkov <bp@suse.de>
+==========================
+The Linux Microcode Loader
+==========================
+
+:Authors: - Fenghua Yu <fenghua.yu@intel.com>
+ - Borislav Petkov <bp@suse.de>
The kernel has a x86 microcode loading facility which is supposed to
provide microcode loading methods in the OS. Potential use cases are
@@ -10,8 +14,8 @@ and updating the microcode on long-running systems without rebooting.
The loader supports three loading methods:
-1. Early load microcode
-=======================
+Early load microcode
+====================
The kernel can update microcode very early during boot. Loading
microcode early can fix CPU issues before they are observed during
@@ -26,8 +30,10 @@ loader parses the combined initrd image during boot.
The microcode files in cpio name space are:
-on Intel: kernel/x86/microcode/GenuineIntel.bin
-on AMD : kernel/x86/microcode/AuthenticAMD.bin
+on Intel:
+ kernel/x86/microcode/GenuineIntel.bin
+on AMD :
+ kernel/x86/microcode/AuthenticAMD.bin
During BSP (BootStrapping Processor) boot (pre-SMP), the kernel
scans the microcode file in the initrd. If microcode matching the
@@ -42,8 +48,8 @@ Here's a crude example how to prepare an initrd with microcode (this is
normally done automatically by the distribution, when recreating the
initrd, so you don't really have to do it yourself. It is documented
here for future reference only).
+::
----
#!/bin/bash
if [ -z "$1" ]; then
@@ -76,15 +82,15 @@ here for future reference only).
cat ucode.cpio $INITRD.orig > $INITRD
rm -rf $TMPDIR
----
+
The system needs to have the microcode packages installed into
/lib/firmware or you need to fixup the paths above if yours are
somewhere else and/or you've downloaded them directly from the processor
vendor's site.
-2. Late loading
-===============
+Late loading
+============
There are two legacy user space interfaces to load microcode, either through
/dev/cpu/microcode or through /sys/devices/system/cpu/microcode/reload file
@@ -94,9 +100,9 @@ The /dev/cpu/microcode method is deprecated because it needs a special
userspace tool for that.
The easier method is simply installing the microcode packages your distro
-supplies and running:
+supplies and running::
-# echo 1 > /sys/devices/system/cpu/microcode/reload
+ # echo 1 > /sys/devices/system/cpu/microcode/reload
as root.
@@ -104,29 +110,29 @@ The loading mechanism looks for microcode blobs in
/lib/firmware/{intel-ucode,amd-ucode}. The default distro installation
packages already put them there.
-3. Builtin microcode
-====================
+Builtin microcode
+=================
The loader supports also loading of a builtin microcode supplied through
the regular builtin firmware method CONFIG_EXTRA_FIRMWARE. Only 64-bit is
currently supported.
-Here's an example:
+Here's an example::
-CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
-CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
+ CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
+ CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
-This basically means, you have the following tree structure locally:
+This basically means, you have the following tree structure locally::
-/lib/firmware/
-|-- amd-ucode
-...
-| |-- microcode_amd_fam15h.bin
-...
-|-- intel-ucode
-...
-| |-- 06-3a-09
-...
+ /lib/firmware/
+ |-- amd-ucode
+ ...
+ | |-- microcode_amd_fam15h.bin
+ ...
+ |-- intel-ucode
+ ...
+ | |-- 06-3a-09
+ ...
so that the build system can find those files and integrate them into
the final kernel image. The early loader finds them and applies them.
--
2.20.1
next prev parent reply other threads:[~2019-05-06 17:11 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 17:08 [PATCH v3 00/27] Include linux x86 docs into Sphinx TOC tree Changbin Du
2019-05-06 17:08 ` [PATCH v3 01/27] Documentation: add Linux x86 docs to " Changbin Du
2019-05-06 17:08 ` [PATCH v3 02/27] Documentation: x86: convert boot.txt to reST Changbin Du
2019-05-06 17:52 ` Mauro Carvalho Chehab
2019-05-08 14:54 ` Changbin Du
2019-05-06 17:08 ` [PATCH v3 03/27] Documentation: x86: convert topology.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 04/27] Documentation: x86: convert exception-tables.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 05/27] Documentation: x86: convert kernel-stacks " Changbin Du
2019-05-06 17:09 ` [PATCH v3 06/27] Documentation: x86: convert entry_64.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 07/27] Documentation: x86: convert earlyprintk.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 08/27] Documentation: x86: convert zero-page.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 09/27] Documentation: x86: convert tlb.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 10/27] Documentation: x86: convert mtrr.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 11/27] Documentation: x86: convert pat.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 12/27] Documentation: x86: convert protection-keys.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 13/27] Documentation: x86: convert intel_mpx.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 14/27] Documentation: x86: convert amd-memory-encryption.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 15/27] Documentation: x86: convert pti.txt " Changbin Du
2019-05-06 17:09 ` Changbin Du [this message]
2019-05-06 17:09 ` [PATCH v3 17/27] Documentation: x86: convert resctrl_ui.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 18/27] Documentation: x86: convert orc-unwinder.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 19/27] Documentation: x86: convert usb-legacy-support.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 20/27] Documentation: x86: convert i386/IO-APIC.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 21/27] Documentation: x86: convert x86_64/boot-options.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 22/27] Documentation: x86: convert x86_64/uefi.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 23/27] Documentation: x86: convert x86_64/mm.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 24/27] Documentation: x86: convert x86_64/5level-paging.txt " Changbin Du
2019-05-06 17:09 ` [PATCH v3 25/27] Documentation: x86: convert x86_64/fake-numa-for-cpusets " Changbin Du
2019-05-06 17:09 ` [PATCH v3 26/27] Documentation: x86: convert x86_64/cpu-hotplug-spec " Changbin Du
2019-05-06 17:09 ` [PATCH v3 27/27] Documentation: x86: convert x86_64/machinecheck " Changbin Du
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