riscv: Implement riscv_get_time() API using rdtime instruction
This adds an implementation of riscv_get_time() API that is using
rdtime instruction.
This is the case for S-mode U-Boot, and is useful for processors
that support rdtime in M-mode too.
Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index b13c876..edfa616 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -9,6 +9,7 @@
obj-$(CONFIG_CMD_BOOTM) += bootm.o
obj-$(CONFIG_CMD_GO) += boot.o
obj-y += cache.o
+obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
obj-$(CONFIG_SIFIVE_CLINT) += sifive_clint.o
obj-y += interrupts.o
obj-y += reset.o