Messages in this thread |  | | From | Andre Przywara <> | Subject | [PATCH v3 0/2] hwrng: Add Arm SMCCC TRNG based driver | Date | Mon, 26 Jul 2021 18:56:08 +0100 |
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The "Arm True Random Number Generator Firmware Interface"[1] provides an SMCCC based interface to a true hardware random number generator. So far we are using that in arch_get_random_seed(), but it might be useful to expose the entropy through the /dev/hwrng device as well. This allows to assess the quality of the implementation, by using "rngtest" from the rng-tools package, for example.
Patch 1 creates a platform device, triggered by the previous discovery of the SMCCC TRNG service. Patch 2 implements a hw_random platform driver, which is instantiated through this said platform device.
The driver can be loaded as module, or built into the kernel.
[1] https://developer.arm.com/documentation/den0098/latest/
Changelog v2 ... v3: - split platform device and driver
Changelog v1 ... v2: - fix building as a module - de-register device upon exit - mention module name in Kconfig
Andre Przywara (2): firmware: smccc: Register smccc_trng platform device hwrng: Add Arm SMCCC TRNG based driver
drivers/char/hw_random/Kconfig | 14 +++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/arm_smccc_trng.c | 134 ++++++++++++++++++++++++ drivers/firmware/smccc/smccc.c | 17 +++ 4 files changed, 166 insertions(+) create mode 100644 drivers/char/hw_random/arm_smccc_trng.c
-- 2.17.6
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