From owner-freebsd-smp Mon Aug 30 22:48:56 1999 Delivered-To: freebsd-smp@freebsd.org Received: from dingo.cdrom.com (dingo.cdrom.com [204.216.28.145]) by hub.freebsd.org (Postfix) with ESMTP id 4B60C159FB for ; Mon, 30 Aug 1999 22:48:53 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost.cdrom.com [127.0.0.1]) by dingo.cdrom.com (8.9.3/8.8.8) with ESMTP id WAA02756; Mon, 30 Aug 1999 22:42:31 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Message-Id: <199908310542.WAA02756@dingo.cdrom.com> X-Mailer: exmh version 2.0.2 2/24/98 To: "Neil Bradley" Cc: smp@freebsd.org Subject: Re: BIOS calls on SMP systems In-reply-to: Your message of "Mon, 30 Aug 1999 21:56:44 PDT." <009c01bef36d$394ee850$076291c6@Engineering.retrocade.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 30 Aug 1999 22:42:31 -0700 From: Mike Smith Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > Can someone familiar with the Intel MP spec clarify for me whether it's > > permissible for an AP to call the BIOS, or whether only the BSP may do > > this? > > It depends upon what services of the BIOS you're looking to call. If it's > the standard INT services, only the BSP will be able to do it reliably. If > you're calling the PCI functions, then you're most likely safe. But it is > safe for the BSP to call BIOS even when the AP's aren't. Ok, so the baseline answer is "only the BSP can reliably call the BIOS". Correct there? If so, I have some interesting tunneling work to do... -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message