This commit adds a pair of scripts, find_apps.py and build_apps.py.
These scripts are intended to be used in various CI jobs, building
multiple applications with different configurations and targets.
The first script, find_apps.py, is used to prepare the list of builds:
1. It finds apps for the given build system.
2. For each app, it finds configurations (sdkconfig files) which need
to be built.
3. It filters out the apps and configurations which are not compatible
with the given target.
4. It outputs the list of builds into stdout or a file. Currently the
format is a list of lines, each line a JSON string. In the future,
the tool can be updated to output YAML files.
The lists of builds can be concatenated and processed with standard
command line tools, like sed.
The second script, build_apps.py, executes the builds from the list.
It can execute a subset of builds based on --parallel-count and
--parallel-index arguments.
These two scripts are intended to replace build_examples_make,
build_examples_cmake, and the custom unit-test-app logic (in the
Makefile and idf_ext.py).
Closes IDF-641
It gave us a better performance of RSA operations. (2~11 times)
The old modexp implementation (Z = X ^ Y mod M) loaded all the data into
the hw registers and was waiting for completion, but due to
the hardware RSA implementation, the calculations always started with 4096 bit,
which took a lot of time.
Measurement results (measurements were made for keys: 2048, 3072 and 4096 bits)
(Old) - Sliding-window exponentiation (HAC 14.85):
keysize = 2048 bits
RSA key operation (performance): public [93206 us], private [280189 us]
keysize = 3072 bits
RSA key operation (performance): public [293614 us], private [858157 us]
keysize = 4096 bits
RSA key operation (performance): public [653192 us], private [1912126 us]
Instead (Old) - Sliding-window exponentiation (HAC 14.85) was implemented
(New) - Montgomery exponentiation (HAC 14.94) which showed
better performance on private and public keys.
keysize = 2048 bits
RSA key operation (performance): public [14504 us], private [149456 us]
keysize = 3072 bits
RSA key operation (performance): public [35073 us], private [392743 us]
keysize = 4096 bits
RSA key operation (performance): public [58650 us], private [787186 us]
For this reason, the old implementation was removed
and the MBEDTLS_HARDWARE_MPI option was turned on by default.
Why the MPI_INTERRUPT option is removed:
the old implementation used calculations on the hardware and
it took a lot of time (10ms - 500ms). And in order not to stand idle
while waiting for completion, an interrupt option was added.
This made it possible to carry out other tasks during the calculation,
and this one to block. The new method is free from such a drawback and
the maximum duration of one RSA HW operation does not exceed 70us (usually 2-70 μs).
This option is no longer needed.
Closes: IDF-965
Use rev-parse to get the HEAD directory instead of manually looking for
it. This method works in the main repository, worktrees and submodules.
Closes https://github.com/espressif/esp-idf/issues/4136
