On Thu, Aug 04, 2005 at 08:56:32PM +0200, Andi Kleen wrote: > On Thu, Aug 04, 2005 at 08:06:36AM -0700, Tom Rini wrote: > > > > > > Why can't you run on x86-64 early? > > > > As I said earlier: > > " > > > If you want to run gdb earlier you need to do it without a tasklet. > > > > We really would like to try again once stacks are setup (IOW, once > > if ((&__get_cpu_var(init_tss))[0].ist[0])) is true). > > " > > > > IOW, when we parse the params on x86_64 this isn't true (or rather it > > wasn't true as of 2.6.9'ish, if this has changed I'd be glad to retest > > things). > > The ISTs are set up for the boot processor extremly early - even > before start_kernel. But they are useless before trap_init() > runs because you won't get any exceptions that need an IDT (or rather > they will all still point to the early exception handler that just panics)
I wonder if there was a reason we couldn't do what we did with i386 and make an early_trap_init() so that we can get what we care about that early at least. I'll have to poke at this a bit more, thanks! -- Tom Rini http://gate.crashing.org/~trini/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
