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474 B
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13 lines
474 B
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.. _rtc-virt-hld:
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RTC Virtualization
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##################
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This document describes the real-time clock (RTC) virtualization implementation
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in the ACRN Device Model.
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vRTC is a read-only RTC for the pre-launched VM, Service VM, and post-launched
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RTVM. It supports read/write (RW) for the CMOS address port 0x70 and read only
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(RO) for the CMOS data port 0x71. Reads to the CMOS RAM offsets are fetched from
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the CMOS hardware directly. Writes to the CMOS offsets are discarded.
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