Jessica Clarke d63a631e72 Add Goldfish RTC device driver for RISC-V ... This device was originally used as part of the goldfish virtual hardware platform used for emulating Android on QEMU, but is now also used as the RTC for the RISC-V virt machine in QEMU. It provides a simple 64-bit nanosecond timer exposed via a pair of memory-mapped 32-bit registers, although only with 1s granularity. Reviewed by: brooks (mentor), jhb (mentor), kp Approved by: brooks (mentor), jhb (mentor), kp Obtained from: CheriBSD Differential Revision: https://reviews.freebsd.org/D25717		2020-07-26 18:15:16 +00:00
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goldfish_rtc.c