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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 04E7BC678D4 for ; Thu, 2 Mar 2023 09:58:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pXfhu-0003Hs-AV; Thu, 02 Mar 2023 04:58:38 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pXfhr-0002wf-IB; Thu, 02 Mar 2023 04:58:36 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pXfhp-0004oV-Ay; Thu, 02 Mar 2023 04:58:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=k7H0JamNirLK0b9S+6VrQbiPo+/xiUG+V4NBU54bSOU=; b=rk/RnhjDtCUBmQsSzF9jgnkcPG dvsv/aBGdnl1KLzuBHDUt6boeMbNkD9Y9Ohs52KDM+iQw+Lt9LSWkXE4BjUW5KTp61bwLASxut2kw 7CzGfQ7MFLo6eWR4aT/QwGPQK7zJbAksEi2KPg89V2CVYxQK7nBU1Zu9Ck8KJfoE8hRUmK3qvmLLK qobjG8PMKAqZEsv+LCzUK6uEonla0Mog6MxhFf3kkzqPD/fCslByDbW9xr5EXHaXHoU7g1I4EDDzT hwafdpR08Dej4uwZESu2z1ypTCZCC5VNidKKRRTe8PhX/C0BtWG+F9UUtav8ZVFX4XL7MdCrwBX8N zLhw7XtQ==; Received: from [2001:8b0:10b:5:d85e:b59b:a166:430c] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pXfhf-002KMp-IE; Thu, 02 Mar 2023 09:58:24 +0000 Message-ID: <518d1e9d938030412f1eaa335b679646ffc788bd.camel@infradead.org> Subject: Re: [PATCH] hw/intc/i8259: Implement legacy LTIM Edge/Level Bank Select From: David Woodhouse To: BALATON Zoltan , "Michael S . Tsirkin" , Paolo Bonzini Cc: Bernhard Beschow , qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Gerd Hoffmann , Daniel Henrique Barboza , Peter Maydell , philmd@linaro.org, ReneEngel80@emailn.de Date: Thu, 02 Mar 2023 09:58:22 +0000 In-Reply-To: <20230302090626.1085437-1-dwmw2@infradead.org> References: <81f53c106bf9584828402ab92e94ac4331c58c7a.camel@infradead.org> <20230302090626.1085437-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OepnPQcLEv539agTtfnL" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+a1ad97f05afd282148df+7130+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-OepnPQcLEv539agTtfnL Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-03-02 at 09:06 +0000, David Woodhouse wrote: > Back in the mists of time, before IBM PS/2 came along with MCA and added > per-pin level control in the ELCR register, the i8259 had a chip-wide > level-mode control in bit 3 of ICW1. Actually... I think MCA might have been level triggered system-wide, and still used this LTIM bit. Per-pin control via ELCR probably came in with EISA? --=-OepnPQcLEv539agTtfnL Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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