From nobody Tue Feb 10 10:03:37 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=1756425277; cv=none; d=zohomail.com; s=zohoarc; b=J+UEb4NPZ6PtPEdejLyOsf2PhK/MV1Y5QsHjoQafC85lPReeZl7Cd+B9p+6bFd+nwk2occXHnhr+9QOxoehSlaqj1V7qJJcVstedj3MlalwXuSn7VIfHoZSArsLpnuB95ikqgMo3B2YOkz2yWdGAj+7qUydde7z4gtSqJTIa+Mk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1756425277; 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=zhXDjX6zALpjs1CF5HHCcMpczoZNDfM8fMBVxC2mgY8=; b=byjXuteXxhUWck1ucI/xb+ledluXXwRtOwQm+1vace/iBNrEZufTH8FSrNelWghcZD0YRKhVFmgJxKYJUPWEUr7KFUQS8ZP4Q6iXxgpd94BSawREIkMf8L4hwsDBobszaQV5co0Zou5ACa4thUpy907ICUHNlvWyC4DUNALVzYo= 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 1756425277152481.3764902711272; Thu, 28 Aug 2025 16:54:37 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1100182.1453811 (Exim 4.92) (envelope-from ) id 1urmRk-0005xU-Da; Thu, 28 Aug 2025 23:54:24 +0000 Received: by outflank-mailman (output) from mailman id 1100182.1453811; Thu, 28 Aug 2025 23:54:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRk-0005w5-4Z; Thu, 28 Aug 2025 23:54:24 +0000 Received: by outflank-mailman (input) for mailman id 1100182; Thu, 28 Aug 2025 23:54:23 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1urmRj-0005nm-9u for xen-devel@lists.xenproject.org; Thu, 28 Aug 2025 23:54:23 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.96) (envelope-from ) id 1urmRi-00B9uE-1t; Thu, 28 Aug 2025 23:54:22 +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 1urmRi-006h8t-1t; Thu, 28 Aug 2025 23:54:22 +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=zhXDjX6zALpjs1CF5HHCcMpczoZNDfM8fMBVxC2mgY8=; b=SqmqzeH1cil2J+by1rP4hrsEln Xig5Rv12JzD3nqEYgW65XPIBM2AacoFekLVBTj0VdhdB/flc3aBsUHYNR7M02FKNrwvdi3VKiZMi7 AUShLB52hL6zeoR4jW4kW4jI/kLn3bkR2D9ygJgLEI9ra/zpdAzN71sZPMm9LC19yOXc=; 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 09/15] emul/ns16x50: implement MCR/MSR registers Date: Thu, 28 Aug 2025 16:54:03 -0700 Message-ID: <20250828235409.2835815-10-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: 1756425277965116600 Content-Type: text/plain; charset="utf-8" From: Denis Mukhin =20 Add MCR/MCR registers emulation to the I/O port handler. Signed-off-by: Denis Mukhin --- Changes since v4: - new patch --- xen/common/emul/vuart/ns16x50.c | 60 +++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/xen/common/emul/vuart/ns16x50.c b/xen/common/emul/vuart/ns16x5= 0.c index 687a7ea2fabe..670c3c6dba9d 100644 --- a/xen/common/emul/vuart/ns16x50.c +++ b/xen/common/emul/vuart/ns16x50.c @@ -394,7 +394,58 @@ static int ns16x50_io_write8( regs[UART_LCR] =3D val; break; =20 + case UART_MCR: { + uint8_t msr_curr, msr_next, msr_delta; + + msr_curr =3D regs[UART_MSR]; + msr_next =3D 0; + msr_delta =3D 0; + + if ( val & UART_MCR_RESERVED0 ) + ns16x50_warn(vdev, "MCR: attempt to set reserved bit: %x\n= ", + UART_MCR_RESERVED0); + + if ( val & UART_MCR_TCRTLR ) + ns16x50_warn(vdev, "MCR: not supported: %x\n", + UART_MCR_TCRTLR); + + if ( val & UART_MCR_RESERVED1 ) + ns16x50_warn(vdev, "MCR: attempt to set reserved bit: %x\n= ", + UART_MCR_RESERVED1); + + /* Set modem status */ + if ( val & UART_MCR_LOOP ) + { + if ( val & UART_MCR_DTR ) + msr_next |=3D UART_MSR_DSR; + if ( val & UART_MCR_RTS ) + msr_next |=3D UART_MSR_CTS; + if ( val & UART_MCR_OUT1 ) + msr_next |=3D UART_MSR_RI; + if ( val & UART_MCR_OUT2 ) + msr_next |=3D UART_MSR_DCD; + } + else + msr_next |=3D UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS; + + /* Calculate changes in modem status */ + if ( (msr_curr & UART_MSR_CTS) ^ (msr_next & UART_MSR_CTS) ) + msr_delta |=3D UART_MSR_DCTS; + if ( (msr_curr & UART_MSR_DSR) ^ (msr_next & UART_MSR_DSR) ) + msr_delta |=3D UART_MSR_DDSR; + if ( (msr_curr & UART_MSR_RI) & (msr_next & UART_MSR_RI) ) + msr_delta |=3D UART_MSR_TERI; + if ( (msr_curr & UART_MSR_DCD) ^ (msr_next & UART_MSR_DCD) ) + msr_delta |=3D UART_MSR_DDCD; + + regs[UART_MCR] =3D val & UART_MCR_MASK; + regs[UART_MSR] =3D msr_next | msr_delta; + + break; + } + case UART_LSR: /* RO */ + case UART_MSR: /* RO */ default: rc =3D -EINVAL; break; @@ -495,6 +546,10 @@ static int ns16x50_io_read8( val =3D regs[UART_LCR]; break; =20 + case UART_MCR: + val =3D regs[UART_MCR]; + break; + case UART_LSR: val =3D regs[UART_LSR] | UART_LSR_THRE | UART_LSR_TEMT; if ( ns16x50_fifo_rx_empty(vdev) ) @@ -506,6 +561,11 @@ static int ns16x50_io_read8( =20 break; =20 + case UART_MSR: + val =3D regs[UART_MSR]; + regs[UART_MSR] &=3D ~UART_MSR_CHANGE; + break; + default: rc =3D -EINVAL; break; --=20 2.51.0