From nobody Wed Feb 11 02:13:34 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=ilande.co.uk Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 169601052081972.29449717661191; Fri, 29 Sep 2023 11:02:00 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qmHo3-0005v4-0v; Fri, 29 Sep 2023 14:01:39 -0400 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 1qmHne-0005Xb-2Y for qemu-devel@nongnu.org; Fri, 29 Sep 2023 14:01:16 -0400 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qmHnP-0005pG-7m for qemu-devel@nongnu.org; Fri, 29 Sep 2023 14:01:12 -0400 Received: from [2a00:23c4:8baf:5f00:c237:5189:8121:f752] (helo=localhost.localdomain) by mail.ilande.co.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qmHn1-00033Y-Jk; Fri, 29 Sep 2023 19:00:39 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=ilande.co.uk; s=20220518; h=Subject:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:To:From:Sender:Reply-To:Cc: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ceP4YhNUPMLYSAHn4R7ae6JZr9zikMQNDBraYKRwoQY=; b=fn/VVwnD8Nl8qkYocEc/z9X0st I42biNzQKS3/zJKgnGO0sR4K02EnCdd3ZAGPy+FjiknSMNrH4uwLOUezS+qj6asOlJpk07A5cYKuK WM3HnwPWOipdMPHoTx5qp3RrDWhDU64BqCj2KSm/tajVZGlKsgg3A11hSNJGAYyRwbkNqbzkXyaC4 xBJHLhDhyD6yzVsS3B3sLQK96wKAvWiw2yJHnxORT0VAhdeAVuUY+nDwImo1oEi4GmSbkUfmbSL05 O0vz5eS12C+wPhc4U1xV1qA/m4mLKC++3n/BccxtDanNjTNtdw8+juIiw8wcS2Jh/qMA0M2RA/2IK lYTVp/2RYBb8lRnQAnDJDEFmrlokwz0svIfoamDGySv5EOdgFafA8Ebg2p+1BJTObhiZwmf34SOLK fJvEUt+diY5FxeoNYyOPhkkYWX/osMKsenEds8rxLxPlxWj8w4k2vTcoIBb8iQfGrN1dFcrsd6CH4 vEVxBHuCVkkSfcIyExTpWj/O0qGvCW+CTGcaK/mlRdF8LKF5yCFrZhVa1BmU+QusJp2OClp7JnapC N3b/8oKZNibg0kjMdcz30rg3zzuehwqRm7d3Zor0mRBKg0jt8lYexQPy3Ka30F8IeSiBHtrOLzd0x 1wEUs7uXLJy76PADztF1PpsFOmx/sKFjauZR8jjdc=; From: Mark Cave-Ayland To: laurent@vivier.eu, qemu-devel@nongnu.org Date: Fri, 29 Sep 2023 18:59:17 +0100 Message-Id: <20230929175917.511133-21-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230929175917.511133-1-mark.cave-ayland@ilande.co.uk> References: <20230929175917.511133-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a00:23c4:8baf:5f00:c237:5189:8121:f752 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH v3 20/20] mac_via: extend timer calibration hack to work with A/UX X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.ilande.co.uk) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2001:41c9:1:41f::167; envelope-from=mark.cave-ayland@ilande.co.uk; helo=mail.ilande.co.uk X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_NONE=0.001, SPF_PASS=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1696010521725100001 Content-Type: text/plain; charset="utf-8" The A/UX timer calibration loop runs continuously until 2 consecutive itera= tions differ by at least 0x492 timer ticks. Modern hosts execute the timer calibr= ation loop so fast that this situation never occurs causing a hang on boot. Use a similar method to Shoebill which is to randomly add 0x500 to the T2 counter value during calibration to enable it to eventually succeed. Signed-off-by: Mark Cave-Ayland Reviewed-by: Laurent Vivier --- hw/misc/mac_via.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c index 500ece5872..b6206ef73c 100644 --- a/hw/misc/mac_via.c +++ b/hw/misc/mac_via.c @@ -983,6 +983,44 @@ static void via1_timer_calibration_hack(MOS6522Q800VIA= 1State *v1s, int addr, /* Looks like there has been a reset? */ v1s->timer_hack_state =3D 1; } + + if (addr =3D=3D VIA_REG_T2CL && val =3D=3D 0xf0) { + /* VIA_REG_T2CL: low byte of counter (A/UX) */ + v1s->timer_hack_state =3D 5; + } + break; + case 5: + if (addr =3D=3D VIA_REG_T2CH && val =3D=3D 0x3c) { + /* + * VIA_REG_T2CH: high byte of counter (A/UX). We are now extre= mely + * likely to be in the A/UX timer calibration routine, so move= to + * the next state where we enable the calibration hack. + */ + v1s->timer_hack_state =3D 6; + } else if ((addr =3D=3D VIA_REG_IER && val =3D=3D 0x20) || + addr =3D=3D VIA_REG_T2CH) { + /* We're doing something else with the timer, not calibration = */ + v1s->timer_hack_state =3D 0; + } + break; + case 6: + if ((addr =3D=3D VIA_REG_IER && val =3D=3D 0x20) || addr =3D=3D VI= A_REG_T2CH) { + /* End of A/UX timer calibration routine, or another write */ + v1s->timer_hack_state =3D 7; + } else { + v1s->timer_hack_state =3D 0; + } + break; + case 7: + /* + * This is the normal post-calibration timer state once both the + * MacOS toolbox and A/UX have been calibrated, until we see a wri= te + * to VIA_REG_PCR to suggest a reset + */ + if (addr =3D=3D VIA_REG_PCR && val =3D=3D 0x22) { + /* Looks like there has been a reset? */ + v1s->timer_hack_state =3D 1; + } break; default: g_assert_not_reached(); @@ -998,6 +1036,7 @@ static uint64_t mos6522_q800_via1_read(void *opaque, h= waddr addr, unsigned size) MOS6522Q800VIA1State *s =3D MOS6522_Q800_VIA1(opaque); MOS6522State *ms =3D MOS6522(s); uint64_t ret; + int64_t now; =20 addr =3D (addr >> 9) & 0xf; ret =3D mos6522_read(ms, addr, size); @@ -1007,6 +1046,23 @@ static uint64_t mos6522_q800_via1_read(void *opaque,= hwaddr addr, unsigned size) /* Quadra 800 Id */ ret =3D (ret & ~VIA1A_CPUID_MASK) | VIA1A_CPUID_Q800; break; + case VIA_REG_T2CH: + if (s->timer_hack_state =3D=3D 6) { + /* + * The A/UX timer calibration loop runs continuously until 2 + * consecutive iterations differ by at least 0x492 timer ticks. + * Modern hosts execute the timer calibration loop so fast that + * this situation never occurs causing a hang on boot. Use a + * similar method to Shoebill which is to randomly add 0x500 to + * the T2 counter value during calibration to enable it to + * eventually succeed. + */ + now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (now & 1) { + ret +=3D 0x5; + } + } + break; } return ret; } --=20 2.39.2