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/cpu/i386/cpu.c b/arch/x86/cpu/i386/cpu.c
index a51a244..3bbad3b 100644
--- a/arch/x86/cpu/i386/cpu.c
+++ b/arch/x86/cpu/i386/cpu.c
@@ -160,6 +160,9 @@
gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_CS] = GDT_ENTRY(0x809b, 0, 0xfffff);
gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_DS] = GDT_ENTRY(0x8093, 0, 0xfffff);
+ gdt_addr[X86_GDT_ENTRY_64BIT_CS] = GDT_ENTRY(0xaf9b, 0, 0xfffff);
+ gdt_addr[X86_GDT_ENTRY_64BIT_TS1] = GDT_ENTRY(0x8980, 0, 0xfffff);
+ gdt_addr[X86_GDT_ENTRY_64BIT_TS2] = 0;
load_gdt(gdt_addr, X86_GDT_NUM_ENTRIES);
load_ds(X86_GDT_ENTRY_32BIT_DS);