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https://github.com/projectacrn/acrn-hypervisor.git
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23177d0a1d
Current code would read physical RTC register and return it directly to guest. This patch would read a base physical RTC time and a base physical TSC time at initialize stage. Then when guest tries to read vRTC time, ACRN HV would read the real TSC time and use the TSC offset to calculate the real RTC time. This patch only support BIN data mode and 24 hour mode. BCD data mode and 12 hour mode will add in other patch. The accuracy of clock provided by this patch is limited by TSC, and will be improved in a following patch also. Tracked-On: #7440 Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com> Reviewed-by: Junjie Mao <junjie.mao@intel.com>
43 lines
771 B
C
43 lines
771 B
C
/*
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* Copyright (C) 2022 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef VRTC_H
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#define VRTC_H
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typedef int32_t time_t;
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/* Register layout of the RTC */
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struct rtcdev {
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uint8_t sec;
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uint8_t alarm_sec;
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uint8_t min;
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uint8_t alarm_min;
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uint8_t hour;
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uint8_t alarm_hour;
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uint8_t day_of_week;
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uint8_t day_of_month;
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uint8_t month;
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uint8_t year;
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uint8_t reg_a;
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uint8_t reg_b;
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uint8_t reg_c;
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uint8_t reg_d;
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uint8_t res[36];
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uint8_t century;
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};
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struct acrn_vrtc {
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struct acrn_vm *vm;
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uint32_t addr; /* RTC register to read or write */
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time_t base_rtctime; /* Base time calulated from physical rtc register. */
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uint64_t base_tsc; /* Base tsc value */
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struct rtcdev rtcdev; /* RTC register */
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};
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#endif /* VRTC_H */
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