From patchwork Tue Mar 8 11:19:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 8532061 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DEC54C0554 for ; Tue, 8 Mar 2016 11:19:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 54160200DE for ; Tue, 8 Mar 2016 11:19:26 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 464A5201D3 for ; Tue, 8 Mar 2016 11:19:24 +0000 (UTC) Received: from localhost ([::1]:33795 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adFff-00007q-Iy for patchwork-qemu-devel@patchwork.kernel.org; Tue, 08 Mar 2016 06:19:23 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51395) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adFfS-00005h-Gs for qemu-devel@nongnu.org; Tue, 08 Mar 2016 06:19:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1adFfQ-0001BR-7x for qemu-devel@nongnu.org; Tue, 08 Mar 2016 06:19:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57584) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adFfQ-0001BK-2M for qemu-devel@nongnu.org; Tue, 08 Mar 2016 06:19:08 -0500 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id C07DD7208C; Tue, 8 Mar 2016 11:19:07 +0000 (UTC) Received: from nilsson.home.kraxel.org (ovpn-116-59.ams2.redhat.com [10.36.116.59]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u28BJ6GX021415; Tue, 8 Mar 2016 06:19:07 -0500 Received: by nilsson.home.kraxel.org (Postfix, from userid 500) id C224D82759; Tue, 8 Mar 2016 12:19:04 +0100 (CET) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Tue, 8 Mar 2016 12:19:00 +0100 Message-Id: <1457435941-17578-6-git-send-email-kraxel@redhat.com> In-Reply-To: <1457435941-17578-1-git-send-email-kraxel@redhat.com> References: <1457435941-17578-1-git-send-email-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 08 Mar 2016 11:19:07 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Cc: "Gabriel L. Somlo" , Gerd Hoffmann Subject: [Qemu-devel] [PULL 5/6] fw_cfg: document ACPI device node information X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Gabriel L. Somlo" Signed-off-by: Gabriel Somlo Reviewed-by: Laszlo Ersek Reviewed-by: Marc Marí Reviewed-by: Michael S. Tsirkin Message-id: 1455906029-25565-6-git-send-email-somlo@cmu.edu Signed-off-by: Gerd Hoffmann --- docs/specs/fw_cfg.txt | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt index 2099ad9..5414140 100644 --- a/docs/specs/fw_cfg.txt +++ b/docs/specs/fw_cfg.txt @@ -84,6 +84,15 @@ Selector Register address: Base + 8 (2 bytes) Data Register address: Base + 0 (8 bytes) DMA Address address: Base + 16 (8 bytes) +== ACPI Interface == + +The fw_cfg device is defined with ACPI ID "QEMU0002". Since we expect +ACPI tables to be passed into the guest through the fw_cfg device itself, +the guest-side firmware can not use ACPI to find fw_cfg. However, once the +firmware is finished setting up ACPI tables and hands control over to the +guest kernel, the latter can use the fw_cfg ACPI node for a more accurate +inventory of in-use IOport or MMIO regions. + == Firmware Configuration Items == === Signature (Key 0x0000, FW_CFG_SIGNATURE) ===