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Tegra denver plat support v3

This patch modifies the 'BUILD_PLAT' makefile variable to point to the soc
specific build directory in order to allow each Tegra soc to have its own
build directory. This way we can keep the build outputs separate and can
keep multiple soc specific builds alive at the same time.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch implements support for T132 (Denver CPU) based Tegra
platforms.

The following features have been added:

* SiP calls to switch T132 CPU's AARCH mode
* Complete PSCI support, including 'System Suspend'
* Platform specific MMIO settings
* Locking of CPU vector registers
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

Denver is NVIDIA's own custom-designed, 64-bit, dual-core CPU which is
fully ARMv8 architecture compatible.  Each of the two Denver cores
implements a 7-way superscalar microarchitecture (up to 7 concurrent
micro-ops can be executed per clock), and includes a 128KB 4-way L1
instruction cache, a 64KB 4-way L1 data cache, and a 2MB 16-way L2
cache, which services both cores.

Denver implements an innovative process called Dynamic Code Optimization,
which optimizes frequently used software routines at runtime into dense,
highly tuned microcode-equivalent routines. These are stored in a
dedicated, 128MB main-memory-based optimization cache. After being read
into the instruction cache, the optimized micro-ops are executed,
re-fetched and executed from the instruction cache as long as needed and
capacity allows.

Effectively, this reduces the need to re-optimize the software routines.
Instead of using hardware to extract the instruction-level parallelism
(ILP) inherent in the code, Denver extracts the ILP once via software
techniques, and then executes those routines repeatedly, thus amortizing
the cost of ILP extraction over the many execution instances.

Denver also features new low latency power-state transitions, in addition
to extensive power-gating and dynamic voltage and clock scaling based on
workloads.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

The validate_power_state() handler checks the power_state for a valid afflvl
and state id. Although the afflvl check is common, the state ids are implementation
defined.

This patch moves the handler to the tegra/soc folder to allow each SoC to validate
the power_state for supported parameters.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch moves the inclusion of CPU code (A53, A57) to T210's
makefile. This way we can reduce code size for Tegra platforms by
including only the required CPU files.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

Tegra misc fixes v3

A new config, ENABLE_NS_L2_CPUECTRL_RW_ACCESS, allows Tegra platforms to
enable read/write access to the L2 and CPUECTRL registers. T210 is the
only platform that needs to enable this config for now.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch locks access to the PMC registers which hold the CPU reset
vector addresses. The PMC registers are used by the warmboot code and
must be locked during boot/resume to avoid booting into custom firmware
installed by unknown parties e.g. hackers.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

The PMC Scratch22 register contains the CPU reset vector to
be used by the warmboot code to power up the CPU while resuming
from  system suspend. This patch locks this PMC register to avoid
any further writes.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch checks if the target CPU is already online before
proceeding with it's power ON sequence.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch de-asserts the CPU reset signals for each CPU as
part of it's power on sequence. This is needed to get rid of
the wait in BPMP firmware during SC7 exit.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch fixes the delay loop used to wake up the BPMP during SC7 exit.
The earlier loop would fail just when the timer was about to wrap-around
(e.g. when TEGRA_TMRUS_BASE is 0xfffffffe, the target value becomes 0,
which would cause the loop to exit before it's expiry).
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

This patch introduces the backend required for implementing the delay
timer API. Tegra has an on-chip free flowing us timer which can be
used as the delay timer.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

Update user guide to use Linaro releases

Fix bug in semihosting write function

Use uintptr_t as base address type in ARM driver APIs

This patch sets the 'USE_COHERENT_MEM' flag to '0', so that the
coherent memory region will not be included in the memory map.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

The return value from the SYS_WRITE semihosting operation is 0 if
the call is successful or the number of bytes not written, if there
is an error. The implementation of the write function in the
semihosting driver treats the return value as the number of bytes
written, which is wrong. This patch fixes it.

Change-Id: Id39dac3d17b5eac557408b8995abe90924c85b85

Linaro produce monthly software releases for the Juno and AEMv8-FVP
platforms. These provide an integrated set of software components
that have been tested together on these platforms.

From now on, it is recommend that Trusted Firmware developers use the
Linaro releases (currently 15.06) as a baseline for the dependent
software components: normal world firmware, Linux kernel and device
tree, file system as well as any additional micro-controller firmware
required by the platform.

This patch updates the user guide to document this new process. It
changes the instructions to get the source code of the full software
stack (including Trusted Firmware) and updates the dependency build
instructions to make use of the build scripts that the Linaro releases
provide.

Change-Id: Ia8bd043f4b74f1e1b10ef0d12cc8a56ed3c92b6e

This patch changes the type of the base address parameter in the
ARM device driver APIs to uintptr_t (GIC, CCI, TZC400, PL011). The
uintptr_t type allows coverage of the whole memory space and to
perform arithmetic operations on the addresses. ARM platform code
has also been updated to use uintptr_t as GIC base address in the
configuration.

Fixes ARM-software/tf-issues#214

Change-Id: I1b87daedadcc8b63e8f113477979675e07d788f1

Implement get_sys_suspend_power_state() handler for Tegra

This patch implements the get_sys_suspend_power_state() handler required by
the PSCI SYSTEM_SUSPEND API. The intent of this handler is to return the
appropriate State-ID field which can be utilized in `affinst_suspend()` to
suspend to system affinity level.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

PSCI: Add SYSTEM_SUSPEND API support

TBB: build 'cert_create' with ECDSA only if OpenSSL supports it

Some Linux distributions include an OpenSSL library which has been
built without ECDSA support. Trying to build the certificate
generation tool on those distributions will result in a build error.

This patch fixes that issue by including ECDSA support only if
OpenSSL has been built with ECDSA. In that case, the OpenSSL
configuration file does not define the OPENSSL_NO_EC macro. The tool
will build successfully, although the resulting binary will not
support ECDSA keys.

Change-Id: I4627d1abd19eef7ad3251997d8218599187eb902

Authentication Framework

This patch updates the user guide, adding instructions to build the
Trusted Firmware with Trusted Board Support using the new framework.

It also provides documentation about the framework itself, including
a detailed section about the TBBR implementation using the framework.

Change-Id: I0849fce9c5294cd4f52981e7a8423007ac348ec6

The authentication framework deprecates plat_match_rotpk()
in favour of plat_get_rotpk_info(). This patch removes
plat_match_rotpk() from the platform port.

Change-Id: I2250463923d3ef15496f9c39678b01ee4b33883b

After updating the main authentication module to use the transport
and crypto modules and the CoT description, the PolarSSL
authentication module is no longer required. This patch deletes it.

Change-Id: I8ba1e13fc1cc7b2fa9df14ff59eb798f0460b878

This patch modifies the Trusted Board Boot implementation to use
the new authentication framework, making use of the authentication
module, the cryto module and the image parser module to
authenticate the images in the Chain of Trust.

A new function 'load_auth_image()' has been implemented. When TBB
is enabled, this function will call the authentication module to
authenticate parent images following the CoT up to the root of
trust to finally load and authenticate the requested image.

The platform is responsible for picking up the right makefiles to
build the corresponding cryptographic and image parser libraries.
ARM platforms use the mbedTLS based libraries.

The platform may also specify what key algorithm should be used
to sign the certificates. This is done by declaring the 'KEY_ALG'
variable in the platform makefile. FVP and Juno use ECDSA keys.

On ARM platforms, BL2 and BL1-RW regions have been increased 4KB
each to accommodate the ECDSA code.

REMOVED BUILD OPTIONS:

  * 'AUTH_MOD'

Change-Id: I47d436589fc213a39edf5f5297bbd955f15ae867

This patch extends the 'cert_create' tool to support ECDSA keys
to sign the certificates. The '--key-alg' command line option
can be used to specify the key algorithm when invoking the tool.
Available options are:

    * 'rsa': create RSA-2048 keys (default option)
    * 'ecdsa': create ECDSA-SECP256R1 keys

The TF Makefile has been updated to allow the platform to specify
the key algorithm by declaring the 'KEY_ALG' variable in the
platform makefile.

The behaviour regarding key management has changed. After applying
this patch, the tool will try first to open the keys from disk. If
one key does not exist or no key is specified, and the command line
option to create keys has been specified, new keys will be created.
Otherwise an error will be generated and the tool will exit. This
way, the user may specify certain keys while the tool will create
the remaining ones. This feature is useful for testing purposes
and CI infrastructures.

The OpenSSL directory may be specified using the build option
'OPENSSL_DIR' when building the certificate generation tool.
Default is '/usr'.

Change-Id: I98bcc2bfab28dd7179f17f1177ea7a65698df4e7

This patch adds a CoT based on the Trusted Board Boot Requirements
document*. The CoT consists of an array of authentication image
descriptors indexed by the image identifiers.

A new header file with TBBR image identifiers has been added.
Platforms that use the TBBR (i.e. ARM platforms) may reuse these
definitions as part of their platform porting.

PLATFORM PORT - IMPORTANT:

Default image IDs have been removed from the platform common
definitions file (common_def.h). As a consequence, platforms that
used those common definitons must now either include the IDs
provided by the TBBR header file or define their own IDs.

*The NVCounter authentication method has not been implemented yet.

Change-Id: I7c4d591863ef53bb0cd4ce6c52a60b06fa0102d5

This patch adds the following mbedTLS based libraries:

* Cryptographic library

It is used by the crypto module to verify a digital signature
and a hash. This library relies on mbedTLS to perform the
cryptographic operations. mbedTLS sources must be obtained
separately.

Two key algorithms are currently supported:

    * RSA-2048
    * ECDSA-SECP256R1

The platform is responsible for picking up the required
algorithm by defining the 'MBEDTLS_KEY_ALG' variable in the
platform makefile. Available options are:

    * 'rsa' (for RSA-2048) (default option)
    * 'ecdsa' (for ECDSA-SECP256R1)

Hash algorithm currently supported is SHA-256.

* Image parser library

Used by the image parser module to extract the authentication
parameters stored in X509v3 certificates.

Change-Id: I597c4be3d29287f2f18b82846973afc142ee0bf0

This patch adds the authentication framework that will be used as
the base to implement Trusted Board Boot in the Trusted Firmware.
The framework comprises the following modules:

- Image Parser Module (IPM)

    This module is responsible for interpreting images, check
    their integrity and extract authentication information from
    them during Trusted Board Boot.

    The module currently supports three types of images i.e.
    raw binaries, X509v3 certificates and any type specific to
    a platform. An image parser library must be registered for
    each image type (the only exception is the raw image parser,
    which is included in the main module by default).

    Each parser library (if used) must export a structure in a
    specific linker section which contains function pointers to:

        1. Initialize the library
        2. Check the integrity of the image type supported by
           the library
        3. Extract authentication information from the image

- Cryptographic Module (CM)

    This module is responsible for verifying digital signatures
    and hashes. It relies on an external cryptographic library
    to perform the cryptographic operations.

    To register a cryptographic library, the library must use the
    REGISTER_CRYPTO_LIB macro, passing function pointers to:

        1. Initialize the library
        2. Verify a digital signature
        3. Verify a hash

    Failing to register a cryptographic library will generate
    a build time error.

- Authentication Module (AM)

    This module provides methods to authenticate an image, like
    hash comparison or digital signatures. It uses the image parser
    module to extract authentication parameters, the crypto module
    to perform cryptographic operations and the Chain of Trust to
    authenticate the images.

    The Chain of Trust (CoT) is a data structure that defines the
    dependencies between images and the authentication methods
    that must be followed to authenticate an image.

The Chain of Trust, when added, must provide a header file named
cot_def.h with the following definitions:

- COT_MAX_VERIFIED_PARAMS

    Integer value indicating the maximum number of authentication
    parameters an image can present. This value will be used by the
    authentication module to allocate the memory required to load
    the parameters in the image descriptor.

Change-Id: Ied11bd5cd410e1df8767a1df23bb720ce7e58178

This patch extends the platform port by adding an API that returns
either the Root of Trust public key (ROTPK) or its hash. This is
usually stored in ROM or eFUSE memory. The ROTPK returned must be
encoded in DER format according to the following ASN.1 structure:

    SubjectPublicKeyInfo  ::=  SEQUENCE  {
        algorithm           AlgorithmIdentifier,
        subjectPublicKey    BIT STRING
    }

In case the platform returns a hash of the key:

    DigestInfo  ::= SEQUENCE {
        digestAlgorithm     AlgorithmIdentifier,
        keyDigest           OCTET STRING
    }

An implementation for ARM development platforms is provided in this
patch. When TBB is enabled, the ROTPK hash location must be specified
using the build option 'ARM_ROTPK_LOCATION'. Available options are:

    - 'regs' : return the ROTPK hash stored in the Trusted
      root-key storage registers.

    - 'devel_rsa' : return a ROTPK hash embedded in the BL1 and
      BL2 binaries. This hash has been obtained from the development
      RSA public key located in 'plat/arm/board/common/rotpk'.

On FVP, the number of MMU tables has been increased to map and
access the ROTPK registers.

A new file 'board_common.mk' has been added to improve code sharing
in the ARM develelopment platforms.

Change-Id: Ib25862e5507d1438da10773e62bd338da8f360bf

The Trusted firmware code identifies BL images by name. The platform
port defines a name for each image e.g. the IO framework uses this
mechanism in the platform function plat_get_image_source(). For
a given image name, it returns the handle to the image file which
involves comparing images names. In addition, if the image is
packaged in a FIP, a name comparison is required to find the UUID
for the image. This method is not optimal.

This patch changes the interface between the generic and platform
code with regard to identifying images. The platform port must now
allocate a unique number (ID) for every image. The generic code will
use the image ID instead of the name to access its attributes.

As a result, the plat_get_image_source() function now takes an image
ID as an input parameter. The organisation of data structures within
the IO framework has been rationalised to use an image ID as an index
into an array which contains attributes of the image such as UUID and
name. This prevents the name comparisons.

A new type 'io_uuid_spec_t' has been introduced in the IO framework
to specify images identified by UUID (i.e. when the image is contained
in a FIP file). There is no longer need to maintain a look-up table
[iname_name --> uuid] in the io_fip driver code.

Because image names are no longer mandatory in the platform port, the
debug messages in the generic code will show the image identifier
instead of the file name. The platforms that support semihosting to
load images (i.e. FVP) must provide the file names as definitions
private to the platform.

The ARM platform ports and documentation have been updated accordingly.
All ARM platforms reuse the image IDs defined in the platform common
code. These IDs will be used to access other attributes of an image in
subsequent patches.

IMPORTANT: applying this patch breaks compatibility for platforms that
use TF BL1 or BL2 images or the image loading code. The platform port
must be updated to match the new interface.

Change-Id: I9c1b04cb1a0684c6ee65dee66146dd6731751ea5

Using assert() to check the length of keys and hashes included in
a certificate is not a safe approach because assert() only applies
to debug builds. A malformed certificate could exploit security
flaws in release binaries due to buffer overflows.

This patch replaces assert() with runtime checkings in the PolarSSL
authentication module, so malformed certificates can not cause a
memory overflow.

Change-Id: I42ba912020595752c806cbd242fe3c74077d993b

The cert_create tool calculates the hash of each BL image and includes
it as an ASN.1 OCTET STRING in the corresponding certificate extension.
Without additional information, the firmware running on the platform
has to know in advance the algorithm used to generate the hash.

This patch modifies the cert_create tool so the certificate extensions
that include an image hash are generated according to the following
ASN.1 structure:

    DigestInfo ::= SEQUENCE {
        digestAlgorithm  AlgorithmIdentifier,
        digest           OCTET STRING
    }

    AlgorithmIdentifier ::=  SEQUENCE  {
        algorithm        OBJECT IDENTIFIER,
        parameters       ANY DEFINED BY algorithm OPTIONAL
    }

The PolarSSL module has been updated to extract the image hash
from the certificate extension according to this structure.

Change-Id: I6d83430f12a8a0eea8447bec7c936e903f644c85

This patch adds a boolean build option 'SAVE_KEYS' to indicate the
certificate generation tool that it must save the private keys used
to establish the chain of trust. This option depends on 'CREATE_KEYS'
to be enabled. Default is '0' (do not save).

Because the same filenames are used as outputs to save the keys,
they are no longer a dependency to the cert_tool. This dependency
has been removed from the Makefile.

Documentation updated accordingly.

Change-Id: I67ab1c2b1f8a25793f0de95e8620ce7596a6bc3b