diff options
Diffstat (limited to 'arch/x86_64/kernel/trampoline.S')
| -rw-r--r-- | arch/x86_64/kernel/trampoline.S | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/trampoline.S b/arch/x86_64/kernel/trampoline.S index 6d9c9a8e7d0e..23a03eb91fc7 100644 --- a/arch/x86_64/kernel/trampoline.S +++ b/arch/x86_64/kernel/trampoline.S @@ -42,8 +42,15 @@ r_base = . movl $0xA5A5A5A5, trampoline_data - r_base # write marker for master knows we're running - lidt idt_48 - r_base # load idt with 0, 0 - lgdt gdt_48 - r_base # load gdt with whatever is appropriate + /* + * GDT tables in non default location kernel can be beyond 16MB and + * lgdt will not be able to load the address as in real mode default + * operand size is 16bit. Use lgdtl instead to force operand size + * to 32 bit. + */ + + lidtl idt_48 - r_base # load idt with 0, 0 + lgdtl gdt_48 - r_base # load gdt with whatever is appropriate xor %ax, %ax inc %ax # protected mode (PE) bit |