Merge pull request #898 from soby-mathew/sm/dcache-early ...

PSCI: Build option to enable D-Caches early in warmboot

Merge pull request #903 from antonio-nino-diaz-arm/an/build-xlat-v1 ...

ARM platforms: Add option to use xlat tables lib v1

Remove build option `ASM_ASSERTION` ...

The build option `ENABLE_ASSERTIONS` should be used instead. That way
both C and ASM assertions can be enabled or disabled together.

All occurrences of `ASM_ASSERTION` in common code and ARM platforms have
been replaced by `ENABLE_ASSERTIONS`.

ASM_ASSERTION has been removed from the user guide.

Change-Id: I51f1991f11b9b7ff83e787c9a3270c274748ec6f
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Add `ENABLE_ASSERTIONS` build option ...

Add the new build option `ENABLE_ASSERTIONS` that controls whether or
not assert functions are compiled out. It defaults to 1 for debug builds
and to 0 for release builds.

Additionally, a following patch will be done to allow this build option
to hide auxiliary code used for the checks done in an `assert()`. This
code is is currently under the DEBUG build flag.

Assert messages are now only printed if LOG_LEVEL >= LOG_LEVEL_INFO,
which is the default for debug builds.

This patch also updates the User Guide.

Change-Id: I1401530b56bab25561bb0f274529f1d12c5263bc
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

PSCI: Build option to enable D-Caches early in warmboot ...

This patch introduces a build option to enable D-cache early on the CPU
after warm boot. This is applicable for platforms which do not require
interconnect programming to enable cache coherency (eg: single cluster
platforms). If this option is enabled, then warm boot path enables
D-caches immediately after enabling MMU.

Fixes ARM-Software/tf-issues#456

Change-Id: I44c8787d116d7217837ced3bcf0b1d3441c8d80e
Signed-off-by: Soby Mathew <soby.mathew@arm.com>

ARM platforms: Add option to use xlat tables lib v1 ...

ARM platforms have migrated to the translation tables library v2.
However, for testing purposes, it can be useful to temporarily switch
back to the old version.

This patch introduces the option `ARM_XLAT_TABLES_LIB_V1`, that switches
to v1 of the library when is set to 1. By default, it is 0, so that ARM
platforms use the new version unless specifically stated.

Updated User Guide.

Change-Id: I53d3c8dd97706f6af9c6fca0364a88ef341efd31
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Merge pull request #885 from antonio-nino-diaz-arm/an/console-flush ...

Implement console_flush()

Merge pull request #886 from dp-arm/dp/stack-protector ...

Add support for GCC stack protection

Add support for GCC stack protection ...

Introduce new build option ENABLE_STACK_PROTECTOR. It enables
compilation of all BL images with one of the GCC -fstack-protector-*
options.

A new platform function plat_get_stack_protector_canary() is introduced.
It returns a value that is used to initialize the canary for stack
corruption detection. Returning a random value will prevent an attacker
from predicting the value and greatly increase the effectiveness of the
protection.

A message is printed at the ERROR level when a stack corruption is
detected.

To be effective, the global data must be stored at an address
lower than the base of the stacks. Failure to do so would allow an
attacker to overwrite the canary as part of an attack which would void
the protection.

FVP implementation of plat_get_stack_protector_canary is weak as
there is no real source of entropy on the FVP. It therefore relies on a
timer's value, which could be predictable.

Change-Id: Icaaee96392733b721fa7c86a81d03660d3c1bc06
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>

Add and use plat_crash_console_flush() API ...

This API makes sure that all the characters sent to the crash console
are output before returning from it.

Porting guide updated.

Change-Id: I1785f970a40f6aacfbe592b6a911b1f249bb2735
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Upgrade mbed TLS version ...

This patch updates the User Guide to recommend the latest version
of mbed TLS library to use with ARM Trusted Firmware.

 - Upgrade mbed TLS library:   2.2.1 -> 2.4.2

Change-Id: Ifb5386fec0673d6dbfdaa474233e397afc279c85

Merge pull request #879 from Summer-ARM/sq/mt-support ...

ARM platforms: Add support for MT bit in MPIDR

ARM platforms: Add support for MT bit in MPIDR ...

This patch modifies some of the functions in ARM platform layer to cater
for the case when multi-threading `MT` is set in MPIDR. A new build flag
`ARM_PLAT_MT` is added, and when enabled, the functions accessing MPIDR
now assume that the `MT` bit is set for the platform and access the bit
fields accordingly.

Also, a new API plat_arm_get_cpu_pe_count is added when `ARM_PLAT_MT` is
enabled, returning the PE count within the physical cpu corresponding to
`mpidr`.

Change-Id: I04ccf212ac3054a60882761f4087bae299af13cb
Signed-off-by: Summer Qin <summer.qin@arm.com>

Merge pull request #872 from dp-arm/dp/fix-typo ...

firmware-design: Fix typo in ToC header flags specification

firmware-design: Fix typo in ToC header flags specification ...

Fixes ARM-software/tf-issues#463

Change-Id: I73e0c5fbd87004953df8b1fa19319ad562ecc867
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

Add workaround for ARM Cortex-A53 erratum 855873 ...

ARM erratum 855873 applies to all Cortex-A53 CPUs.
The recommended workaround is to promote "data cache clean"
instructions to "data cache clean and invalidate" instructions.
For core revisions of r0p3 and later this can be done by setting a bit
in the CPUACTLR_EL1 register, so that hardware takes care of the promotion.
As CPUACTLR_EL1 is both IMPLEMENTATION DEFINED and can be trapped to EL3,
we set the bit in firmware.
Also we dump this register upon crashing to provide more debug
information.

Enable the workaround for the Juno boards.

Change-Id: I3840114291958a406574ab6c49b01a9d9847fec8
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Merge pull request #860 from jeenu-arm/hw-asstd-coh ...

Patches for platforms with hardware-assisted coherency

Merge pull request #856 from antonio-nino-diaz-arm/an/dynamic-xlat ...

Introduce version 2 of the translation tables library

Apply workaround for errata 813419 of Cortex-A57 ...

TLBI instructions for EL3 won't have the desired effect under specific
circumstances in Cortex-A57 r0p0. The workaround is to execute DSB and
TLBI twice each time.

Even though this errata is only needed in r0p0, the current errata
framework is not prepared to apply run-time workarounds. The current one
is always applied if compiled in, regardless of the CPU or its revision.

This errata has been enabled for Juno.

The `DSB` instruction used when initializing the translation tables has
been changed to `DSB ISH` as an optimization and to be consistent with
the barriers used for the workaround.

Change-Id: Ifc1d70b79cb5e0d87e90d88d376a59385667d338
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Add dynamic region support to xlat tables lib v2 ...

Added APIs to add and remove regions to the translation tables
dynamically while the MMU is enabled. Only static regions are allowed
to overlap other static ones (for backwards compatibility).

A new private attribute (MT_DYNAMIC / MT_STATIC) has been added to
flag each region as such.

The dynamic mapping functionality can be enabled or disabled when
compiling by setting the build option PLAT_XLAT_TABLES_DYNAMIC to 1
or 0. This can be done per-image.

TLB maintenance code during dynamic table mapping and unmapping has
also been added.

Fixes ARM-software/tf-issues#310

Change-Id: I19e8992005c4292297a382824394490c5387aa3b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

Merge pull request #859 from Summer-ARM/sq/update-doc ...

Update LOAD_IMAGE_V2 user guide documentation

Merge pull request #853 from vwadekar/tegra-changes-from-downstream-v3 ...

Tegra changes from downstream v3

PSCI: Optimize call paths if all participants are cache-coherent ...

The current PSCI implementation can apply certain optimizations upon the
assumption that all PSCI participants are cache-coherent.

  - Skip performing cache maintenance during power-up.

  - Skip performing cache maintenance during power-down:

    At present, on the power-down path, CPU driver disables caches and
    MMU, and performs cache maintenance in preparation for powering down
    the CPU. This means that PSCI must perform additional cache
    maintenance on the extant stack for correct functioning.

    If all participating CPUs are cache-coherent, CPU driver would
    neither disable MMU nor perform cache maintenance. The CPU being
    powered down, therefore, remain cache-coherent throughout all PSCI
    call paths. This in turn means that PSCI cache maintenance
    operations are not required during power down.

  - Choose spin locks instead of bakery locks:

    The current PSCI implementation must synchronize both cache-coherent
    and non-cache-coherent participants. Mutual exclusion primitives are
    not guaranteed to function on non-coherent memory. For this reason,
    the current PSCI implementation had to resort to bakery locks.

    If all participants are cache-coherent, the implementation can
    enable MMU and data caches early, and substitute bakery locks for
    spin locks. Spin locks make use of architectural mutual exclusion
    primitives, and are lighter and faster.

The optimizations are applied when HW_ASSISTED_COHERENCY build option is
enabled, as it's expected that all PSCI participants are cache-coherent
in those systems.

Change-Id: Iac51c3ed318ea7e2120f6b6a46fd2db2eae46ede
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

build: Define build option for hardware-assisted coherency ...

The boolean build option HW_ASSISTED_COHERENCY is introduced to enable
various optimizations in ARM Trusted Software, when built for such
systems. It's set to 0 by default.

Change-Id: I638390da6e1718fe024dcf5b402e07084f1eb014
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

Update LOAD_IMAGE_V2 user guide documentation ...

Now the TRUSTED_BOARD_BOOT is supported for AArch64 when LOAD_IMAGE_V2
is enabled. This patch updates the user-guide.md documentation for the
same.

Change-Id: I97de07435c81258c2a5f41a30a69736863a10bd1
Signed-off-by: Summer Qin <summer.qin@arm.com>

Tegra: enable ECC/Parity protection for Cortex-A57 CPUs ...

This patch enables L2 ECC and Parity Protection for ARM Cortex-A57 CPUs
for Tegra SoCs.

Change-Id: I038fcd529991d0201a4951ce2730ab71b1c980f9
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

Merge pull request #848 from douglas-raillard-arm/dr/improve_errata_doc ...

Clarify errata ERRATA_A53_836870 documentation

Clarify errata ERRATA_A53_836870 documentation ...

The errata is enabled by default on r0p4, which is confusing given that
we state we do not enable errata by default.

This patch clarifies this sentence by saying it is enabled in hardware
by default.

Change-Id: I70a062d93e1da2416d5f6d5776a77a659da737aa
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>

Tegra: init normal/crash console for platforms ...

The BL2 fills in the UART controller ID to be used as the normal as
well as the crash console on Tegra platforms. The controller ID to
UART controller base address mapping is handled by each Tegra SoC
the base addresses might change across Tegra chips.

This patch adds the handler to parse the platform params to get the
UART ID for the per-soc handlers.

Change-Id: I4d167b20a59aaf52a31e2a8edf94d8d6f89598fa
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

Tegra: add tzdram_base to plat_params_from_bl2 struct ...

This patch adds another member, tzdram_base, to the plat_params_from_bl2 struct
in order to store the TZDRAM carveout base address used to load the Trusted OS.
The monitor programs the memory controller with the TZDRAM base and size in order
to deny any accesses from the NS world.

Change-Id: If39b8674d548175d7ccb6525c18d196ae8a8506c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>