arch/x86: Declare GDT symbols and move_gdt()

We relocate GDT to CBMEM, this can be done late in ramstage.
Note: We currently do this for BSP CPU only.

Change-Id: I626faaf22f846433f25ca2253d6a2a5230f50b6b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7858
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/include/cpu/x86/gdt.h b/src/include/cpu/x86/gdt.h
new file mode 100644
index 0000000000..260b158d1f
--- /dev/null
+++ b/src/include/cpu/x86/gdt.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef CPU_X86_GDT
+#define CPU_X86_GDT
+
+/* These symbols are defined in c_start.S. */
+extern char gdt[];
+extern char gdt_end[];
+extern char idtarg[];
+
+/* These symbols are defined in secondary.S. */
+extern char _secondary_gdt_addr[];
+extern char _secondary_start[];
+extern char _secondary_start_end[];
+
+/* Defined in src/arch/x86/boot/gdt.c */
+void move_gdt(void);
+
+#endif /* CPU_X86_GDT */