From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2B92EC4332F for ; Mon, 30 Oct 2023 08:29:15 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 8F6AA8725E; Mon, 30 Oct 2023 09:29:11 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=fail (p=quarantine dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id 6915A879A2; Mon, 30 Oct 2023 09:29:09 +0100 (CET) Received: from Atcsqr.andestech.com (60-248-80-70.hinet-ip.hinet.net [60.248.80.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id C885A87096 for ; Mon, 30 Oct 2023 09:29:06 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=fail (p=quarantine dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=ycliang@andestech.com Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 39U8So26095121; Mon, 30 Oct 2023 16:28:50 +0800 (+08) (envelope-from ycliang@andestech.com) Received: from swlinux02 (10.0.15.183) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Mon, 30 Oct 2023 16:28:47 +0800 Date: Mon, 30 Oct 2023 16:25:11 +0800 From: Leo Liang To: Heinrich Schuchardt CC: Rick Chen , Sughosh Ganu , Anup Patel , Kautuk Consul , Chanho Park , Subject: Re: [RFC v2 2/2] rng: Provide a RNG based on the RISC-V Zkr ISA extension Message-ID: References: <20231029084533.44607-1-heinrich.schuchardt@canonical.com> <20231029084533.44607-3-heinrich.schuchardt@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20231029084533.44607-3-heinrich.schuchardt@canonical.com> User-Agent: Mutt/2.2.10 (e0e92c31) (2023-03-25) X-Originating-IP: [10.0.15.183] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 39U8So26095121 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean On Sun, Oct 29, 2023 at 09:45:33AM +0100, Heinrich Schuchardt wrote: > The Zkr ISA extension (ratified Nov 2021) introduced the seed CSR. It > provides an interface to a physical entropy source. > > A RNG driver based on the seed CSR is provided. It depends on > mseccfg.sseed being set in the SBI firmware. > > Signed-off-by: Heinrich Schuchardt > --- > v2: > Resume after exception if seed CSR cannot be read. > --- > drivers/rng/Kconfig | 8 +++ > drivers/rng/Makefile | 1 + > drivers/rng/riscv_zkr_rng.c | 116 ++++++++++++++++++++++++++++++++++++ > 3 files changed, 125 insertions(+) > create mode 100644 drivers/rng/riscv_zkr_rng.c Reviewed-by: Leo Yu-Chi Liang