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-rw-r--r--include/hw/i386/pc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 729784879f..7e43b20b4b 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -277,6 +277,8 @@ int cmos_get_fd_drive_type(FloppyDriveType fd0);
 
 #define FW_CFG_IO_BASE     0x510
 
+#define PORT92_A20_LINE "a20"
+
 /* acpi_piix.c */
 
 I2CBus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,