From patchwork Tue Oct 9 20:56:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 981520 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42V8hK0SdBz9s7W for ; Wed, 10 Oct 2018 07:58:09 +1100 (AEDT) Received: from localhost ([::1]:53817 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g9z4w-0005og-Js for incoming@patchwork.ozlabs.org; Tue, 09 Oct 2018 16:58:06 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54513) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g9z4E-0005mx-1p for qemu-devel@nongnu.org; Tue, 09 Oct 2018 16:57:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1g9z45-0002jF-5F for qemu-devel@nongnu.org; Tue, 09 Oct 2018 16:57:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52556) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1g9z44-0002iq-Sl for qemu-devel@nongnu.org; Tue, 09 Oct 2018 16:57:13 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 343EC3083390; Tue, 9 Oct 2018 20:57:12 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-105.ams2.redhat.com [10.36.116.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2D31C1001F40; Tue, 9 Oct 2018 20:57:09 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Date: Tue, 9 Oct 2018 22:56:49 +0200 Message-Id: <20181009205652.10605-5-david@redhat.com> In-Reply-To: <20181009205652.10605-1-david@redhat.com> References: <20181009205652.10605-1-david@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Tue, 09 Oct 2018 20:57:12 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v1 4/7] range: add some more functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , "Michael S . Tsirkin" , David Hildenbrand , Michael Roth , Markus Armbruster , Igor Mammedov , "Dr . David Alan Gilbert" , David Gibson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Add some more functions that will be used in memory-device context. range_init(): Init using lower bound and size range_valid(): Check if there would be an overflow when initializin range_size(): Extract the size of a range range_overlaps_range(): Check for overlaps of two ranges range_contains_range(): Check if one range is contained in the other range_starts_before_range(): Check if one range starts before another range_ends_after_range(): Check if one range ends after another Signed-off-by: David Hildenbrand --- include/qemu/range.h | 80 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) diff --git a/include/qemu/range.h b/include/qemu/range.h index 7e75f4e655..18e8acf22f 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -112,6 +112,86 @@ static inline uint64_t range_upb(Range *range) return range->upb; } +/* + * Initialize @range to span the interval [@lob,@lob + @size - 1]. + * @size may be 0. + */ +static inline void range_init(Range *range, uint64_t lob, uint64_t size) +{ + range->lob = lob; + range->upb = lob + size - 1; + range_invariant(range); +} + +/* + * Check if the interval [@lob,@lob + @size - 1] would be valid or not + * (result in an overflow). + */ +static inline bool range_valid(uint64_t lob, uint64_t size) +{ + return lob + size >= lob; +} + +/* + * Get the size of @range. + */ +static inline uint64_t range_size(const Range *range) +{ + return range->upb - range->lob + 1; +} + +/* + * Check if @range1 overlaps with @range2. If one of the ranges is empty, + * the result is always "false". + */ +static inline bool range_overlaps_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return !(range2->upb < range1->lob || range1->upb < range2->lob); +} + +/* + * Check if @range1 contains @range2. If one of the ranges is empty, + * the result is always "false". + */ +static inline bool range_contains_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return range1->lob <= range2->lob && range1->upb >= range2->upb; +} + +/* + * Check if @range1 starts before @range2. If one of the ranges is empty, + * the result is alsways "false". + */ +static inline bool range_starts_before_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return range1->lob < range2->lob; +} + +/* + * Check if @range1 ends after @range2. If one of the ranges is empty, + * the result is alsways "false". + */ +static inline bool range_ends_after_range(const Range *range1, + const Range *range2) +{ + if (range_is_empty(range1) || range_is_empty(range2)) { + return false; + } + return range1->upb > range2->upb; +} + /* * Extend @range to the smallest interval that includes @extend_by, too. */