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-rw-r--r--hw/mc146818rtc_regs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/mc146818rtc_regs.h b/hw/mc146818rtc_regs.h
index 3ab37709f0..fc10076ece 100644
--- a/hw/mc146818rtc_regs.h
+++ b/hw/mc146818rtc_regs.h
@@ -58,5 +58,6 @@
#define REG_C_IRQF 0x80
#define REG_C_PF 0x40
#define REG_C_AF 0x20
+#define REG_C_MASK 0x70
#endif