rng: Provide a RNG based on the RISC-V Zkr ISA extension
The Zkr ISA extension (ratified Nov 2021) introduced the seed CSR. It
provides an interface to a physical entropy source.
A RNG driver based on the seed CSR is provided. It depends on
mseccfg.sseed being set in the SBI firmware.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/drivers/rng/Makefile b/drivers/rng/Makefile
index 47b323e..a5d3ca4 100644
--- a/drivers/rng/Makefile
+++ b/drivers/rng/Makefile
@@ -10,6 +10,7 @@
obj-$(CONFIG_RNG_NPCM) += npcm_rng.o
obj-$(CONFIG_RNG_OPTEE) += optee_rng.o
obj-$(CONFIG_RNG_STM32) += stm32_rng.o
+obj-$(CONFIG_RNG_RISCV_ZKR) += riscv_zkr_rng.o
obj-$(CONFIG_RNG_ROCKCHIP) += rockchip_rng.o
obj-$(CONFIG_RNG_IPROC200) += iproc_rng200.o
obj-$(CONFIG_RNG_SMCCC_TRNG) += smccc_trng.o