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| author | Sami Mujawar <sami.mujawar@arm.com> | 2019-01-10 14:20:41 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-01-22 06:55:22 +0000 |
| commit | 473c5b295e427a3ac4d92266193096321eb9fe2a (patch) | |
| tree | 425a25b9a0d24171cabc63449217eee67bb84ab3 | |
| parent | 5ae841d17ba297d75843035135cee35ee6b68f0a (diff) | |
| download | kvmtool-473c5b295e427a3ac4d92266193096321eb9fe2a.tar.gz | |
rtc: Initialize the Register D for MC146818 RTC
Some software drivers check the VRT bit (BIT7) of Register D before
using the MC146818 RTC. Initialized the VRT bit in rtc__init() to
indicate that the RAM and time contents are valid.
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | hw/rtc.c | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -25,6 +25,11 @@ #define RTC_REG_C 0x0C #define RTC_REG_D 0x0D +/* + * Register D Bits + */ +#define RTC_REG_D_VRT (1 << 7) + struct rtc_device { u8 cmos_idx; u8 cmos_data[128]; @@ -140,6 +145,9 @@ int rtc__init(struct kvm *kvm) return r; } + /* Set the VRT bit in Register D to indicate valid RAM and time */ + rtc.cmos_data[RTC_REG_D] = RTC_REG_D_VRT; + return r; } dev_init(rtc__init); |