From nobody Tue Feb 10 04:02:20 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=1756425286; cv=none; d=zohomail.com; s=zohoarc; b=DXjzJ9E+NNv6VDjep74S48s27ZAmMXFlH98aDCz3Os9/HUIkMMteehTWtvrIy2PDRnRvEt5lbOklQvR+bPTmIWQqcDRPjpH5aLipXNd04u8lImUUGfzIS0nyRQQHQpQAr9GzHUUKwoNtpznVsuBbkRZtVwgMTRlQ457TePUEgAw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1756425286; 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=URrCdASjRQ9Vdlu6Z9QVQa30dc5DA0baY3L6/nvVCms=; b=WW7EOmErB7BfUDjyCTKBJt0z+0v/5I6QTR5nELdeg4nBrJZcg4GYxz9ozttvsEenBBCLutOetQAMjVRmdWJE4AStiMG1T1sf2IIoN75peXZfw7AyQYbfv8XoGvbfcrttb9NtBwRi0E/mb93a3BdLs0LXbc7oDZDQrMMxp1Ba0ck= 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 1756425286828378.2916395380232; Thu, 28 Aug 2025 16:54:46 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1100180.1453806 (Exim 4.92) (envelope-from ) id 1urmRj-0005sv-UH; Thu, 28 Aug 2025 23:54:23 +0000 Received: by outflank-mailman (output) from mailman id 1100180.1453806; Thu, 28 Aug 2025 23:54:23 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRj-0005sI-NB; Thu, 28 Aug 2025 23:54:23 +0000 Received: by outflank-mailman (input) for mailman id 1100180; Thu, 28 Aug 2025 23:54:22 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRi-0005Wl-41 for xen-devel@lists.xenproject.org; Thu, 28 Aug 2025 23:54:22 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.96) (envelope-from ) id 1urmRh-00B9u0-1i; Thu, 28 Aug 2025 23:54:21 +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 1urmRh-006h8p-1i; Thu, 28 Aug 2025 23:54:21 +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=URrCdASjRQ9Vdlu6Z9QVQa30dc5DA0baY3L6/nvVCms=; b=KcRT2ecfpvFix6byPMbgJM5kc0 WVDwtP0I/3gVUsFeCY2nqxwC+X9amXlJCmQqHAjtbwJDKqGBjT2Z7SwHIUUtCLhRig4Ye37m19YnC 55xx21uHLNSnMqJLOgbWNsSUjys/kdbuTtsKfO1YZZOpp285xVPodCAcA4dwNzqdNUc4=; 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 08/15] emul/ns16x50: implement LCR/LSR registers Date: Thu, 28 Aug 2025 16:54:02 -0700 Message-ID: <20250828235409.2835815-9-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: 1756425287981116600 Content-Type: text/plain; charset="utf-8" From: Denis Mukhin =20 Add LCR/LSR registers implementation to the I/O port handler. Signed-off-by: Denis Mukhin --- Changes since v4: - new patch --- xen/common/emul/vuart/ns16x50.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/xen/common/emul/vuart/ns16x50.c b/xen/common/emul/vuart/ns16x5= 0.c index 65ca96dd8bd3..687a7ea2fabe 100644 --- a/xen/common/emul/vuart/ns16x50.c +++ b/xen/common/emul/vuart/ns16x50.c @@ -347,6 +347,9 @@ static int ns16x50_io_write8( else ns16x50_fifo_tx_putchar(vdev, val); =20 + if ( rc =3D=3D -ENOSPC ) + regs[UART_LSR] |=3D UART_LSR_OE; + rc =3D 0; =20 break; @@ -387,6 +390,11 @@ static int ns16x50_io_write8( =20 break; =20 + case UART_LCR: + regs[UART_LCR] =3D val; + break; + + case UART_LSR: /* RO */ default: rc =3D -EINVAL; break; @@ -460,6 +468,9 @@ static int ns16x50_io_read8( switch ( reg ) { case UART_RBR: + /* NB: do not forget to clear overrun condition */ + regs[UART_LSR] &=3D ~UART_LSR_OE; + rc =3D ns16x50_fifo_rx_getchar(vdev); if ( rc >=3D 0 ) val =3D (uint8_t)rc; @@ -480,6 +491,21 @@ static int ns16x50_io_read8( =20 break; =20 + case UART_LCR: + val =3D regs[UART_LCR]; + break; + + case UART_LSR: + val =3D regs[UART_LSR] | UART_LSR_THRE | UART_LSR_TEMT; + if ( ns16x50_fifo_rx_empty(vdev) ) + val &=3D ~UART_LSR_DR; + else + val |=3D UART_LSR_DR; + + regs[UART_LSR] =3D val & ~UART_LSR_MASK; + + break; + default: rc =3D -EINVAL; break; --=20 2.51.0