diff --git a/src/arch/x86/include/arch/vga.h b/src/arch/x86/include/arch/vga.h
new file mode 100644
index 0000000..b82d635
--- /dev/null
+++ b/src/arch/x86/include/arch/vga.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef ARCH_X86_VGA_H
+#define ARCH_X86_VGA_H
+
+/* VGA MMIO and SMM ASEG share the same address range */
+#define VGA_MMIO_BASE	0xa0000
+#define VGA_MMIO_SIZE	0x20000
+#define VGA_MMIO_LIMIT	(VGA_MMIO_BASE + VGA_MMIO_SIZE - 1)
+
+#endif /* ARCH_X86_VGA_H */