wakeup_header
u32 wakeup_header;
struct wakeup_header *header =
(struct wakeup_header *) __va(real_mode_header->wakeup_header);
if (wakeup_header.real_magic != 0x12345678)
if (wakeup_header.realmode_flags & 4)
if (wakeup_header.realmode_flags & 1)
if (wakeup_header.realmode_flags & 2) {
set_mode(wakeup_header.video_mode);
extern struct wakeup_header wakeup_header;