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-rw-r--r--src/arch/x86/gdt.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/arch/x86/gdt.c b/src/arch/x86/gdt.c
new file mode 100644
index 0000000..a21fab2
--- /dev/null
+++ b/src/arch/x86/gdt.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ *
+ * 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.
+ */
+
+#include <types.h>
+#include <string.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <cpu/x86/gdt.h>
+
+/* i386 lgdt argument */
+struct gdtarg {
+ u16 limit;
+#ifdef __x86_64__
+ u64 base;
+#else
+ u32 base;
+#endif
+} __attribute__((packed));
+
+/* Copy GDT to new location and reload it.
+ * FIXME: We only do this for BSP CPU.
+ */
+static void move_gdt(int is_recovery)
+{
+ void *newgdt;
+ u16 num_gdt_bytes = (uintptr_t)&gdt_end - (uintptr_t)&gdt;
+ struct gdtarg gdtarg;
+
+ newgdt = cbmem_find(CBMEM_ID_GDT);
+ if (!newgdt) {
+ newgdt = cbmem_add(CBMEM_ID_GDT, ALIGN(num_gdt_bytes, 512));
+ if (!newgdt) {
+ printk(BIOS_ERR, "Error: Could not relocate GDT.\n");
+ return;
+ }
+ printk(BIOS_DEBUG, "Moving GDT to %p...", newgdt);
+ memcpy((void*)newgdt, &gdt, num_gdt_bytes);
+ }
+
+ gdtarg.base = (uintptr_t)newgdt;
+ gdtarg.limit = num_gdt_bytes - 1;
+
+ __asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg));
+ printk(BIOS_DEBUG, "ok\n");
+}
+RAMSTAGE_CBMEM_INIT_HOOK(move_gdt)
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