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kvm tools, rtc: Nonvolatile BIOS memory support

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This adds a ->cmos_data array to 'struct rtc_device' that is used to emulate
nonvolatile BIOS memory and the RTC registers.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2011-11-28 21:02:19 +02:00
committed by Will Deacon
parent c717392f5c
commit d951bae032
1 changed files with 14 additions and 0 deletions
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hw/rtc.c
+14
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@@ -26,6 +26,7 @@
struct rtc_device {
u8 cmos_idx;
u8 cmos_data[128];
};
static struct rtc_device rtc;
@@ -66,6 +67,9 @@ static bool cmos_ram_data_in(struct ioport *ioport, struct kvm *kvm, u16 port, v
case RTC_YEAR:
ioport__write8(data, bin2bcd(tm->tm_year));
break;
default:
ioport__write8(data, rtc.cmos_data[rtc.cmos_idx]);
break;
}
return true;
@@ -73,6 +77,16 @@ static bool cmos_ram_data_in(struct ioport *ioport, struct kvm *kvm, u16 port, v
static bool cmos_ram_data_out(struct ioport *ioport, struct kvm *kvm, u16 port, void *data, int size)
{
switch (rtc.cmos_idx) {
case RTC_REG_C:
case RTC_REG_D:
/* Read-only */
break;
default:
rtc.cmos_data[rtc.cmos_idx] = ioport__read8(data);
break;
}
return true;
}