Kernel/x86_64: Fix booting with time=legacy#26840
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I don't think it changes much, it's mainly for consistency with the other reads/writes.
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Jun 29, 2026
Reading the register C let the hardware know that it can send a new interrupt. Doing it during the initialization sequence allows the RTC to work as intended if, for some reason, an interrupt was sent before we started to handle them. This fixes booting the kernel with `time=legacy`. With this flag enabled, I've experienced deadlocks inside QEMU 11.0.1 itself but this works as expected on QEMU 10.2.1.
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