diff options
Diffstat (limited to 'arch/x86/cpu/start.S')
| -rw-r--r-- | arch/x86/cpu/start.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index ec12e8044..e960e21f6 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -55,8 +55,16 @@ _x86boot_start: movl %eax, %cr0 wbinvd + /* Tell 32-bit code it is being entered from an in-RAM copy */ + movw $GD_FLG_WARM_BOOT, %bx + jmp 1f _start: - /* This is the 32-bit cold-reset entry point */ + /* + * This is the 32-bit cold-reset entry point. Initialize %bx to 0 + * in case we're preceeded by some sort of boot stub. + */ + movw $GD_FLG_COLD_BOOT, %bx +1: /* Load the segement registes to match the gdt loaded in start16.S */ movl $(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax |