Create syscalls to make possible using random APIs from user mode
threads. These APIs can have different implementations, like using
entropy driver or Xoroshiro128. Some of these implementations also have
some globals to preserve state between calls.
Make it run entire in user space would require user adding these globals
to their memeory domains and/or grant access to entropy device. Syscalls
simplify its usage.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Replace CONFIG_ENTROPY_NAME with DT_CHOSEN_ZEPHYR_ENTROPY_LABEL. We now
set zephyr,entropy in the chosen node of the device tree to the entropy
device.
This allows us to remove CONFIG_ENTROPY_NAME from dts_fixup.h. Also
remove any other stale ENTROPY related defines in dts_fixup.h files.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
When using LLVM/Clang, it complains about memcpy() being
casted to (void *):
warning: expression result unused; should this cast be to 'void'? [-Wunused-value]
So change those to (void) instead as the return of memcpy()
is not used anyway.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
1) Add cryptographically secure random functions to provide
FIPS 140-2 compliant random functions.
2) Add name to random function choice selectors to ease
selection in SOC .defconfig files
3) Add bulk fill random functions.
Signed-off-by: David Leach <david.leach@nxp.com>
move entropy.h to drivers/entropy.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Current implementation of the xoroshiro depends on the ISR being
triggered when the interrupts is locked. This patch proposes
implementing the init with entropy_get_isr. This implementation
can be called at PRE_KERNEL_2 stage, even when the interrupts
are locked.
Fixes: GH-8199
Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
Not only removes a branch during normal operation, but also ensures
that, by initializing at the PRE_KERNEL_2 stage, and granting
privileges to all threads to the semaphore, this code will work in
early boot situations and in user mode.
This assumes that entropy drivers will all initialize during
PRE_KERNEL_1 stage. All in-tree drivers do that.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Semaphore state_sem initial count is set to 0 but k_sem_give()
is invoked first in sys_rand32_get() which will block the caller
forever.
Fix the issue by setting the initail count to count_limit.
Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
This adds an implementation of Xoroshiro128+ PRNG, based on the
original implementation at [1]. This pseudorandom number generator
will use the entropy driver to obtain the seed.
While it uses only 128 bits of state, it's pretty robust for non-crypto
safe applications.
[1] http://vigna.di.unimi.it/xorshift/xoroshiro128plus.c
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
