1 files changed, 65 insertions, 0 deletions
diff --git a/arch/x86/include/asm/modes.h b/arch/x86/include/asm/modes.h
new file mode 100644
index 0000000000..8417ddc4b5
--- /dev/null
+++ b/arch/x86/include/asm/modes.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2009 Juergen Beisert, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/**
+ * @file
+ * @brief Declarations to bring some light in the real/protected/flat mode darkness
+ */
+#ifndef _ASM_X86_MODES_H
+#define _ASM_X86_MODES_H
+
+#ifndef __ASSEMBLY__
+
+#include <types.h>
+
+extern uint64_t gdt[];
+extern unsigned gdt_size;
+
+#endif
+
+/** to simplify GDT entry generation */
+#define GDT_ENTRY(flags, base, limit)			\
+	((((base)  & 0xff000000ULL) << (56-24)) |	\
+	 (((flags) & 0x0000f0ffULL) << 40) |		\
+	 (((limit) & 0x000f0000ULL) << (48-16)) |	\
+	 (((base)  & 0x00ffffffULL) << 16) |		\
+	 (((limit) & 0x0000ffffULL)))
+
+/** 32 bit barebox text */
+#define GDT_ENTRY_BOOT_CS	2
+#define __BOOT_CS		(GDT_ENTRY_BOOT_CS * 8)
+
+/** 32 bit barebox data */
+#define GDT_ENTRY_BOOT_DS	3
+#define __BOOT_DS		(GDT_ENTRY_BOOT_DS * 8)
+
+/** 16 bit barebox text */
+#define GDT_ENTRY_REAL_CS	4
+#define __REAL_CS		(GDT_ENTRY_REAL_CS * 8)
+
+/** 16 bit barebox data */
+#define GDT_ENTRY_REAL_DS	5
+#define __REAL_DS		(GDT_ENTRY_REAL_DS * 8)
+
+/** Something to make others happy */
+#define GDT_ENTRY_BOOT_TSS	6
+#define __BOOT_TSS		(GDT_ENTRY_BOOT_TSS * 8)
+
+#endif /* _ASM_X86_MODES_H */