Function vrtc_nvram_write

freebsd/amd64/vmm/io/vrtc.c:788–813

}

int
vrtc_nvram_write(struct vm *vm, int offset, uint8_t value)
{
	struct vrtc *vrtc;
	uint8_t *ptr;

	vrtc = vm_rtc(vm);

	/*
	 * Don't allow writes to RTC control registers or the date/time fields.
	 */
	if (offset < offsetof(struct rtcdev, nvram[0]) ||
	    offset == RTC_CENTURY || offset >= sizeof(struct rtcdev)) {
		VM_CTR1(vrtc->vm, "RTC nvram write to invalid offset %d",
		    offset);
		return (EINVAL);
	}

	VRTC_LOCK(vrtc);
	ptr = (uint8_t *)(&vrtc->rtcdev);
	ptr[offset] = value;
	VM_CTR2(vrtc->vm, "RTC nvram write %#x to offset %#x", value, offset);
	VRTC_UNLOCK(vrtc);

	return (0);
}

int
vrtc_nvram_read(struct vm *vm, int offset, uint8_t *retval)