From patchwork Fri Feb 19 18:20:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Gabriel L. Somlo" X-Patchwork-Id: 8363391 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 CCE56C0553 for ; Fri, 19 Feb 2016 18:21:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3BF5C203F7 for ; Fri, 19 Feb 2016 18:21:09 +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 8710F203DA for ; Fri, 19 Feb 2016 18:21:08 +0000 (UTC) Received: from localhost ([::1]:54455 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWpfv-0004o9-Sq for patchwork-qemu-devel@patchwork.kernel.org; Fri, 19 Feb 2016 13:21:07 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54914) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWpfS-0004cG-HM for qemu-devel@nongnu.org; Fri, 19 Feb 2016 13:20:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aWpfR-0006ZA-GZ for qemu-devel@nongnu.org; Fri, 19 Feb 2016 13:20:38 -0500 Received: from relay-06.andrew.cmu.edu ([128.2.157.21]:47165 helo=relay.andrew.cmu.edu) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aWpfM-0006V8-Sf; Fri, 19 Feb 2016 13:20:32 -0500 Received: from HEDWIG.ini.cmu.edu (HEDWIG.INI.CMU.EDU [128.2.16.51]) by relay.andrew.cmu.edu (8.14.8/8.14.8) with ESMTP id u1JIKTk8008851; Fri, 19 Feb 2016 13:20:30 -0500 From: "Gabriel L. Somlo" To: qemu-devel@nongnu.org Date: Fri, 19 Feb 2016 13:20:29 -0500 Message-Id: <1455906029-25565-6-git-send-email-somlo@cmu.edu> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1455906029-25565-1-git-send-email-somlo@cmu.edu> References: <1455906029-25565-1-git-send-email-somlo@cmu.edu> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.74 on 128.2.157.21 X-MIME-Autoconverted: from 8bit to quoted-printable by relay.andrew.cmu.edu id u1JIKTk8008851 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x X-Received-From: 128.2.157.21 Cc: peter.maydell@linaro.org, ehabkost@redhat.com, mst@redhat.com, matt@codeblueprint.co.uk, stefanha@gmail.com, ard.biesheuvel@linaro.org, leif.lindholm@linaro.org, luto@amacapital.net, qemu-arm@nongnu.org, kraxel@redhat.com, pbonzini@redhat.com, imammedo@redhat.com, lersek@redhat.com, rth@twiddle.net Subject: [Qemu-devel] [PATCH v9 5/5] 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 Signed-off-by: Gabriel Somlo Reviewed-by: Laszlo Ersek Reviewed-by: Marc Marí Reviewed-by: Michael S. Tsirkin --- 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) ===