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-rw-r--r--arch/x86/include/asm/vga.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h
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--- /dev/null
+++ b/arch/x86/include/asm/vga.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Access to VGA videoram
+ *
+ * (c) 1998 Martin Mares <mj@ucw.cz>
+ */
+
+#ifndef _ASM_X86_VGA_H
+#define _ASM_X86_VGA_H
+
+#include <asm/set_memory.h>
+
+/*
+ * On the PC, we can just recalculate addresses and then
+ * access the videoram directly without any black magic.
+ * To support memory encryption however, we need to access
+ * the videoram as decrypted memory.
+ */
+
+#define VGA_MAP_MEM(x, s) \
+({ \
+ unsigned long start = (unsigned long)phys_to_virt(x); \
+ \
+ if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) \
+ set_memory_decrypted(start, (s) >> PAGE_SHIFT); \
+ \
+ start; \
+})
+
+#define vga_readb(x) (*(x))
+#define vga_writeb(x, y) (*(y) = (x))
+
+#endif /* _ASM_X86_VGA_H */