From nobody Wed Feb 11 04:06:06 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1756425283; cv=none; d=zohomail.com; s=zohoarc; b=FCncD5dazlNKjmwNtxBUZGtHVFhcTlZUkH36+1mhW6vnv2RUDKmIBPJ1Zhpy4zvanin2N1JBzGkz1FaM4fsHjV4OCe5hzqCTf7N+Tczccqc+NWzwrJYaz1lRORYpL83htgEu841rRqtqapXJxYfbFcp0DYmUnDJv9n/KzP2U+cw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1756425283; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=0Z4aoKd8azAcWKj2wK4QZPV/Vhzat9Cv97B7YdCWD3U=; b=VlAqaC73HmbQ+KiEleyknbXASmukd/DOTwXD1CzQIwPh1Sa4iz4u0Vm+ObfBrJyXwuuxeZnPpS9mvJ8KGFMYnbPPmz7cxqwr3mbxLrz9fC/J6nqJShJ/t9+9P4qY63xCb2WdEgaWHcvZSBnYQWVZuy6UmNq61eotR2vpt6UFTE8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1756425283306676.5617280357095; Thu, 28 Aug 2025 16:54:43 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1100179.1453796 (Exim 4.92) (envelope-from ) id 1urmRi-0005aH-H7; Thu, 28 Aug 2025 23:54:22 +0000 Received: by outflank-mailman (output) from mailman id 1100179.1453796; Thu, 28 Aug 2025 23:54:22 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRi-0005ZM-CQ; Thu, 28 Aug 2025 23:54:22 +0000 Received: by outflank-mailman (input) for mailman id 1100179; Thu, 28 Aug 2025 23:54:21 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRh-0005Hr-9z for xen-devel@lists.xenproject.org; Thu, 28 Aug 2025 23:54:21 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.96) (envelope-from ) id 1urmRg-00B9tp-1W; Thu, 28 Aug 2025 23:54:20 +0000 Received: from [19.12.91.86] (helo=localhost) by xenbits.xenproject.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1urmRg-006h8f-1W; Thu, 28 Aug 2025 23:54:20 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:Cc:To:From; bh=0Z4aoKd8azAcWKj2wK4QZPV/Vhzat9Cv97B7YdCWD3U=; b=eXjBgWzrVW14JNMT6B8gaC1wDT Omeqq1isWnIWwW4/CnK74gFSubvqZ8y7e73t70twrt9AuzWdZiGWBCDotndvlZYXW3vSIrF2X+zQN OJp8XuI5HWrSUUU/iwkYYIreVjFVYhO7nHpMQUy5UMnUPCzr6oS3wMAYUDsiX0dIfQ1A=; From: dmukhin@xen.org To: xen-devel@lists.xenproject.org Cc: andrew.cooper3@citrix.com, anthony.perard@vates.tech, jbeulich@suse.com, julien@xen.org, michal.orzel@amd.com, roger.pau@citrix.com, sstabellini@kernel.org, dmukhin@ford.com Subject: [PATCH v5 07/15] emul/ns16x50: implement FCR register (write-only) Date: Thu, 28 Aug 2025 16:54:01 -0700 Message-ID: <20250828235409.2835815-8-dmukhin@ford.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250828235409.2835815-1-dmukhin@ford.com> References: <20250828235409.2835815-1-dmukhin@ford.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @xen.org) X-ZM-MESSAGEID: 1756425284046116600 Content-Type: text/plain; charset="utf-8" From: Denis Mukhin =20 Add emulation logic for FCR register. Note, that does not hooks FIFO interrupt moderation to the FIFO management code. Signed-off-by: Denis Mukhin --- Changes since v4: - new patch --- xen/common/emul/vuart/ns16x50.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/xen/common/emul/vuart/ns16x50.c b/xen/common/emul/vuart/ns16x5= 0.c index efb2f4c6441c..65ca96dd8bd3 100644 --- a/xen/common/emul/vuart/ns16x50.c +++ b/xen/common/emul/vuart/ns16x50.c @@ -363,6 +363,30 @@ static int ns16x50_io_write8( =20 break; =20 + case UART_FCR: /* WO */ + if ( val & UART_FCR_RESERVED0 ) + ns16x50_warn(vdev, "FCR: attempt to set reserved bit: %x\n= ", + UART_FCR_RESERVED0); + + if ( val & UART_FCR_RESERVED1 ) + ns16x50_warn(vdev, "FCR: attempt to set reserved bit: %x\n= ", + UART_FCR_RESERVED1); + + if ( val & UART_FCR_CLRX ) + ns16x50_fifo_rx_reset(vdev); + + if ( val & UART_FCR_CLTX ) + ns16x50_fifo_tx_flush(vdev); + + if ( val & UART_FCR_ENABLE ) + val &=3D UART_FCR_ENABLE | UART_FCR_DMA | UART_FCR_TRG_MAS= K; + else + val =3D 0; + + regs[UART_FCR] =3D val; + + break; + default: rc =3D -EINVAL; break; --=20 2.51.0