From patchwork Fri Dec 14 13:10:42 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 10731131 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C5C6316B1 for ; Fri, 14 Dec 2018 13:12:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B4E7A2D38F for ; Fri, 14 Dec 2018 13:12:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0FAB2D3B5; Fri, 14 Dec 2018 13:12:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4B0BA2D38F for ; Fri, 14 Dec 2018 13:12:05 +0000 (UTC) Received: from localhost ([::1]:33443 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gXnG8-0007GV-IT for patchwork-qemu-devel@patchwork.kernel.org; Fri, 14 Dec 2018 08:12:04 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33882) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gXnF0-0007F3-TV for qemu-devel@nongnu.org; Fri, 14 Dec 2018 08:10:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gXnEz-0001mE-P3 for qemu-devel@nongnu.org; Fri, 14 Dec 2018 08:10:54 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36408) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gXnEz-0001lw-JM for qemu-devel@nongnu.org; Fri, 14 Dec 2018 08:10:53 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id ABB173082138; Fri, 14 Dec 2018 13:10:52 +0000 (UTC) Received: from t460s.redhat.com (ovpn-117-94.ams2.redhat.com [10.36.117.94]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0DAC05C1A1; Fri, 14 Dec 2018 13:10:50 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Date: Fri, 14 Dec 2018 14:10:42 +0100 Message-Id: <20181214131043.25071-2-david@redhat.com> In-Reply-To: <20181214131043.25071-1-david@redhat.com> References: <20181214131043.25071-1-david@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Fri, 14 Dec 2018 13:10:53 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v5 1/2] 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 , David Hildenbrand , "Michael S . Tsirkin" , "Dr . David Alan Gilbert" , Igor Mammedov , David Gibson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add some more functions that will be used in memory-device context. range_init(): Init using lower bound and size, check for validity range_init_nofail(): Init using lower bound and size, validity asserted 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 Reviewed-by: Igor Mammedov Signed-off-by: David Hildenbrand --- include/qemu/range.h | 62 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/include/qemu/range.h b/include/qemu/range.h index 7e75f4e655..ba606c6bc0 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -112,6 +112,68 @@ 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. If the range would overflow, returns -ERANGE, otherwise + * 0. + */ +static inline int QEMU_WARN_UNUSED_RESULT range_init(Range *range, uint64_t lob, + uint64_t size) +{ + if (lob + size < lob) { + return -ERANGE; + } + range->lob = lob; + range->upb = lob + size - 1; + range_invariant(range); + return 0; +} + +/* + * Initialize @range to span the interval [@lob,@lob + @size - 1]. + * @size may be 0. Range must not overflow. + */ +static inline void range_init_nofail(Range *range, uint64_t lob, uint64_t size) +{ + range->lob = lob; + range->upb = lob + size - 1; + range_invariant(range); +} + +/* + * 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; +} + /* * Extend @range to the smallest interval that includes @extend_by, too. */