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  31. 24 May, 2019 3 commits
    • Alexei Fedorov's avatar
      Add support for Branch Target Identification · 9fc59639
      Alexei Fedorov authored 
      

This patch adds the functionality needed for platforms to provide
Branch Target Identification (BTI) extension, introduced to AArch64
in Armv8.5-A by adding BTI instruction used to mark valid targets
for indirect branches. The patch sets new GP bit [50] to the stage 1
Translation Table Block and Page entries to denote guarded EL3 code
pages which will cause processor to trap instructions in protected
pages trying to perform an indirect branch to any instruction other
than BTI.
BTI feature is selected by BRANCH_PROTECTION option which supersedes
the previous ENABLE_PAUTH used for Armv8.3-A Pointer Authentication
and is disabled by default. Enabling BTI requires compiler support
and was tested with GCC versions 9.0.0, 9.0.1 and 10.0.0.
The assembly macros and helpers are modified to accommodate the BTI
instruction.
This is an experimental feature.
Note. The previous ENABLE_PAUTH build option to enable PAuth in EL3
is now made as an internal flag and BRANCH_PROTECTION flag should be
used instead to enable Pointer Authentication.
Note. USE_LIBROM=1 option is currently not supported.

Change-Id: Ifaf4438609b16647dc79468b70cd1f47a623362e
Signed-off-by: default avatarAlexei Fedorov <Alexei.Fedorov@arm.com>
      9fc59639
    • John Tsichritzis's avatar
      Docs fixes · a16fd37f
      John Tsichritzis authored 
      

1) Fix links in "about" page
2) Put back the "contents" page with adjusted links

Change-Id: Id09140b91df5cf0a275149801d05d8cfeeda1c6e
Signed-off-by: default avatarJohn Tsichritzis <john.tsichritzis@arm.com>
      a16fd37f
    • John Tsichritzis's avatar
      Update security documentation · 55f14059
      John Tsichritzis authored 
      

1) Replace references to "Arm Trusted Firmware" with "TF-A"
2) Update issue tracker link

Change-Id: I12d827d49f6cc34e46936d7f7ccf44e32b26a0bd
Signed-off-by: default avatarJohn Tsichritzis <john.tsichritzis@arm.com>
      55f14059
  33. 22 May, 2019 10 commits
    • Paul Beesley's avatar
      doc: Use proper note and warning annotations · e1c5026a
      Paul Beesley authored 
      

The documentation contains plenty of notes and warnings. Enable
special rendering of these blocks by converting the note prefix
into a .. note:: annotation.

Change-Id: I34e26ca6bf313d335672ab6c2645741900338822
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      e1c5026a
    • Paul Beesley's avatar
      doc: Refactor contributor acknowledgements · f94102ba
      Paul Beesley authored 
      

- Make the list of contributors into an actual list
- Use note syntax for the note
- Remove the Individuals heading since there are none

This file could be considered for removal as it is a legacy
document, as its note explains.

Change-Id: Idf984bc192af7a0ec367a6642ab99ccccf5df1a8
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      f94102ba
    • Paul Beesley's avatar
      doc: Reorganise images and update links · a2c320a8
      Paul Beesley authored 
      

Change-Id: I679d1499376a524bef1cfc33df995b0a719b5ac8
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      a2c320a8
    • Paul Beesley's avatar
      doc: Set correct syntax highlighting style · 29c02529
      Paul Beesley authored 
      

Several code blocks do not specify a language for syntax
highlighting. This results in Sphinx using a default highlighter
which is Python.

This patch adds the correct language to each code block that doesn't
already specify it.

Change-Id: Icce1949aabfdc11a334a42d49edf55fa673cddc3
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      29c02529
    • Paul Beesley's avatar
      doc: Add minimal glossary · 8f62ca7b
      Paul Beesley authored 
      

One of the current issues with the documentation is that terms and
abbreviations are frequently redefined. For example, we might have
a sentence like "... the SCP (System Control Processor) will ...".

These definitions might be repeated several times across pages, or
even within the same document. Equally, some of these abbreviations
are missed and are never expanded.

Sphinx provides a :term: keyword that takes some text and,
if that text is defined in a glossary document, links to its glossary
entry. Using this functionality will prevent repeated definitions
and will make the docs more maintainable by using a single
definition source.

The glossary added in this patch was created from a quick scrub of
the source code - there may be missing entries. The SDEI abbreviation
was used as an example.

Note that a global_substitutions file was created. This file contains
the RST 'replace' statements that convert plain text terms into linked
terms (by adding the ':term:' keyword to them). An example is:

.. |TF-A| replace:: :term:`TF-A`

The 'rst_prolog' variable in conf.py is used to inject this list of
replacements into each page. Terms must be surrounded with the pipe
character to be turned into links - this means that we can still
prevent certain terms from being linked if we don't want them to be.

Change-Id: I87010ed9cfa4a60011a9b4a431b98cb4bb7baa28
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      8f62ca7b
    • Paul Beesley's avatar
      doc: Remove per-page contents lists · 57354abb
      Paul Beesley authored 
      

These are no longer needed as there will always be a table of contents
rendered to the left of every page.

Some of these lists can be quite long and, when opening a page, the
reader sees nothing but a huge list of contents! After this patch,
the document contents are front-and-centre and the contents are
nicely rendered in the sidebar without duplication.

Change-Id: I444754d548ec91d00f2b04e861de8dde8856aa62
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      57354abb
    • Paul Beesley's avatar
      doc: Format security advisory titles and headings · 267f8085
      Paul Beesley authored 
      

Required so that the advisory documents are all valid RST files (with a
header) and that they all integrate into the document tree.

Change-Id: I68ca2b0b9e648e24b460deb772c471a38518da26
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      267f8085
    • Paul Beesley's avatar
      doc: Reformat platform port documents · 24dba2b3
      Paul Beesley authored 
      

The platform port documents are not very standardised right now and
they don't integrate properly into the document tree so:

1) Make sure each port has a proper name and title (incl. owner)
2) Correct use of headings, subheadings, etc in each port
3) Resolve any naming conflicts between documents

Change-Id: I4c2da6f57172b7f2af3512e766ae9ce3b840b50f
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      24dba2b3
    • Paul Beesley's avatar
      doc: Normalise section numbering and headings · 83993177
      Paul Beesley authored 
      

Required work to make all documents sit at the correct levels within
the document tree and any derived content like the table of contents
and the categories in the sidebar.

Change-Id: I4885fbe30864a87c8822ee67482b71fb46a8fbc6
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      83993177
    • Paul Beesley's avatar
      doc: Reword document titles · 8aa05055
      Paul Beesley authored 
      

This patch attempts to standardise the document titles as well as
adding titles to documents that were missing one. The aim is to
remove needless references to "TF-A" or "Trusted Firmware" in the
title of every document and to make sure that the title matches
with the document content.

Change-Id: I9b93ccf43b5d57e8dc793a5311b8ed7c4dd245cc
Signed-off-by: default avatarPaul Beesley <paul.beesley@arm.com>
      8aa05055