Function vrtc_nvram_read

freebsd/amd64/vmm/io/vrtc.c:815–845

}

int
vrtc_nvram_read(struct vm *vm, int offset, uint8_t *retval)
{
	struct vrtc *vrtc;
	sbintime_t basetime;
	time_t curtime;
	uint8_t *ptr;

	/*
	 * Allow all offsets in the RTC to be read.
	 */
	if (offset < 0 || offset >= sizeof(struct rtcdev))
		return (EINVAL);

	vrtc = vm_rtc(vm);
	VRTC_LOCK(vrtc);

	/*
	 * Update RTC date/time fields if necessary.
	 */
	if (offset < 10 || offset == RTC_CENTURY) {
		curtime = vrtc_curtime(vrtc, &basetime);
		secs_to_rtc(curtime, vrtc, 0);
	}

	ptr = (uint8_t *)(&vrtc->rtcdev);
	*retval = ptr[offset];

	VRTC_UNLOCK(vrtc);
	return (0);
}

int
vrtc_addr_handler(struct vm *vm, int vcpuid, bool in, int port, int bytes,