arch/x86/include/arch/vga: add defines for VGA MMIO addresses
To avoid magic constants in the code, add defines for the VGA MMIO
address range from 0xa0000-0xbffff.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ie4a4f39a4e876bbba59620d689cd56c3c286daae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75618
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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 */