From owner-freebsd-smp Mon Aug 30 18:53:44 1999 Delivered-To: freebsd-smp@freebsd.org Received: from mail.rdc1.sfba.home.com (ha1.rdc1.sfba.home.com [24.0.0.66]) by hub.freebsd.org (Postfix) with ESMTP id B8E9E152A6 for ; Mon, 30 Aug 1999 18:53:43 -0700 (PDT) (envelope-from adsharma@c62443-a.frmt1.sfba.home.com) Received: from c62443-a.frmt1.sfba.home.com ([24.0.69.165]) by mail.rdc1.sfba.home.com (InterMail v4.01.01.00 201-229-111) with ESMTP id <19990831015148.DXRO29524.mail.rdc1.sfba.home.com@c62443-a.frmt1.sfba.home.com>; Mon, 30 Aug 1999 18:51:48 -0700 Received: (from adsharma@localhost) by c62443-a.frmt1.sfba.home.com (8.9.3/8.9.3) id UAA31591; Mon, 30 Aug 1999 20:51:43 -0700 Date: Mon, 30 Aug 1999 20:51:43 -0700 From: Arun Sharma To: Mike Smith Cc: smp@FreeBSD.ORG Subject: Re: BIOS calls on SMP systems Message-ID: <19990830205143.A31493@home.com> References: <199908302230.PAA00751@dingo.cdrom.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.6i In-Reply-To: <199908302230.PAA00751@dingo.cdrom.com>; from Mike Smith on Mon, Aug 30, 1999 at 03:30:41PM -0700 Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, Aug 30, 1999 at 03:30:41PM -0700, Mike Smith wrote: > > 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? MP Spec doesn't say that APs can't call the BIOS. So I think you're okay if you make BIOS calls from an AP. However, the MP spec does mention that most BIOSes are not multithreaded and hence the caller must make sure that only one AP is executing the BIOS at anytime. [ Appendix A - System BIOS programming guidelines ] -Arun To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message