x86: Add 64-bit entries to the GDT
At present it is not possible to execution 64-bit code without
installing an entire new Global Descriptor Table. This is inconvenient
since kvm does not seem to like switching into long mode with a new
table.
It isn't actually necessary, since we can just extend the existing
table. Add some new entries to this effect.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index d7b6836..ad8240b 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -18,7 +18,10 @@
#define X86_GDT_ENTRY_16BIT_DS 6
#define X86_GDT_ENTRY_16BIT_FLAT_CS 7
#define X86_GDT_ENTRY_16BIT_FLAT_DS 8
-#define X86_GDT_NUM_ENTRIES 9
+#define X86_GDT_ENTRY_64BIT_CS 9
+#define X86_GDT_ENTRY_64BIT_TS1 10
+#define X86_GDT_ENTRY_64BIT_TS2 11
+#define X86_GDT_NUM_ENTRIES 12
#define X86_GDT_SIZE (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)