From: Andi Kleen <ak@suse.de>
To: Tom Rini <trini@kernel.crashing.org>
Cc: Andi Kleen <ak@suse.de>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
amitkale@linsyssoft.com
Subject: Re: [patch 07/15] Basic x86_64 support
Date: Thu, 4 Aug 2005 20:56:32 +0200 [thread overview]
Message-ID: <20050804185632.GD8266@wotan.suse.de> (raw)
In-Reply-To: <20050804150636.GD3337@smtp.west.cox.net>
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)
-Andi
next prev parent reply other threads:[~2005-08-04 18:56 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1.2972005.trini@kernel.crashing.org>
2005-07-29 21:18 ` [patch 01/15] KGDB: Core files Tom Rini
2005-07-29 21:18 ` [patch 02/15] KGDB: i386 core functionality Tom Rini
2005-07-29 21:19 ` [patch 03/15] Basic PowerPC32 support Tom Rini
2005-07-29 21:19 ` [patch 04/15] I/O driver for 8250-compatible UARTs Tom Rini
2005-07-29 21:19 ` [patch 05/15] Basic MIPS support Tom Rini
2005-07-29 21:19 ` [patch 06/15] Basic IA64 support Tom Rini
2005-07-29 21:20 ` [patch 07/15] Basic x86_64 support Tom Rini
2005-07-29 21:20 ` [patch 08/15] Basic SuperH support Tom Rini
2005-07-29 21:20 ` [patch 09/15] KGDB: Basic ARM support Tom Rini
2005-07-29 21:20 ` [patch 10/15] Basic support for PowerPC64 Tom Rini
2005-07-29 21:20 ` [patch 11/15] KGDB: KGDBoE I/O driver Tom Rini
2005-07-29 21:21 ` [patch 12/15] KGDB: Add CFI DWARF2 annotation support Tom Rini
2005-07-29 21:21 ` [patch 13/15] Minor SysRq keyboard bugfix for KGDB Tom Rini
2005-07-29 21:21 ` [patch 14/15] Allow KGDB to work well with loaded modules Tom Rini
2005-07-29 21:21 ` [patch 15/15] Add hardware breakpoint support for i386 Tom Rini
2005-08-04 0:55 ` [patch 11/15] KGDB: KGDBoE I/O driver Matt Mackall
2005-08-03 13:05 ` [patch 07/15] Basic x86_64 support Andi Kleen
2005-08-03 13:37 ` Tom Rini
2005-08-04 12:39 ` Andi Kleen
2005-08-04 14:04 ` Tom Rini
2005-08-04 14:06 ` Andi Kleen
2005-08-04 14:14 ` Tom Rini
2005-08-04 14:28 ` Andi Kleen
2005-08-04 15:06 ` Tom Rini
2005-08-04 18:56 ` Andi Kleen [this message]
2005-08-04 19:08 ` Tom Rini
2005-08-07 0:48 ` Keith Owens
2005-08-08 17:56 ` Tom Rini
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