From patchwork Wed Dec 9 15:54:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olaf Hering X-Patchwork-Id: 11961791 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BB79C4361B for ; Wed, 9 Dec 2020 15:55:18 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 866FE22B4B for ; Wed, 9 Dec 2020 15:55:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 866FE22B4B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=aepfle.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.48404.85606 (Exim 4.92) (envelope-from ) id 1kn1o5-0000Rz-VW; Wed, 09 Dec 2020 15:55:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 48404.85606; Wed, 09 Dec 2020 15:55:09 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kn1o5-0000Rr-SU; Wed, 09 Dec 2020 15:55:09 +0000 Received: by outflank-mailman (input) for mailman id 48404; Wed, 09 Dec 2020 15:55:08 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kn1o4-0000O2-KB for xen-devel@lists.xenproject.org; Wed, 09 Dec 2020 15:55:08 +0000 Received: from mo4-p01-ob.smtp.rzone.de (unknown [81.169.146.164]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 31da302d-6595-43d6-aebb-98ed20980d29; Wed, 09 Dec 2020 15:55:03 +0000 (UTC) Received: from sender by smtp.strato.de (RZmta 47.6.3 DYNA|AUTH) with ESMTPSA id 007720wB9Fsx0bB (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)) (Client did not present a certificate); Wed, 9 Dec 2020 16:54:59 +0100 (CET) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 31da302d-6595-43d6-aebb-98ed20980d29 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1607529303; s=strato-dkim-0002; d=aepfle.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:From: Subject:Sender; bh=ti7wpap7OKPtBty/ilhF07cZXxS6hyTWcz0abirc9Nk=; b=IqFVHRvEQJI8EdzsqLVU4d73cnsrkHaKATHpes1Gv8xzJG4nRbXnMc3Tsg9ovNcrXA Gcq+2lQHFp4cP9disWVwv3+8cc6XI3esQCp/bR+fbUAcNeA4roRNJYVglLxlHCfia2z8 CIBPXUPnO/YhoOm/0ayf8RUP1ZOeGUPZ9yxMPRRDKgh5gR3GZBVOW3n8N5qXWV7WMI0G oAOs9cLvagI3VwzJGL4OI7K0DVSMoFSLyPvL2wifIUDHkpC5TLknyFHtf3EJdXHIp1Ti XOMV350sUKuZiuFQUcyfPHxuzVBujESqdPlcwM3YGtiZI6HOoxjw1FfABNz011hsTnKf Socw== X-RZG-AUTH: ":P2EQZWCpfu+qG7CngxMFH1J+3q8wa/QXkBR9MXjAuz7MdiQehTvc3KJf+TWodQ==" X-RZG-CLASS-ID: mo00 From: Olaf Hering To: xen-devel@lists.xenproject.org Cc: Olaf Hering , Ian Jackson , Wei Liu Subject: [PATCH v1 3/3] tools: add API to work with sevaral bits at once Date: Wed, 9 Dec 2020 16:54:51 +0100 Message-Id: <20201209155452.28376-3-olaf@aepfle.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201209155452.28376-1-olaf@aepfle.de> References: <20201209155452.28376-1-olaf@aepfle.de> MIME-Version: 1.0 Introduce new API to test if a fixed number of bits is clear or set, and clear or set them all at once. The caller has to make sure the input bitnumber is a multiply of BITS_PER_LONG. This API avoids the loop over each bit in a known range just to see if all of them are either clear or set. Signed-off-by: Olaf Hering --- tools/libs/ctrl/xc_bitops.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/libs/ctrl/xc_bitops.h b/tools/libs/ctrl/xc_bitops.h index f0bac4a071..92f38872fb 100644 --- a/tools/libs/ctrl/xc_bitops.h +++ b/tools/libs/ctrl/xc_bitops.h @@ -77,4 +77,29 @@ static inline void bitmap_or(void *_dst, const void *_other, dst[i] |= other[i]; } +static inline int test_bit_long_set(unsigned long nr_base, const void *_addr) +{ + const unsigned long *addr = _addr; + unsigned long val = addr[nr_base / BITS_PER_LONG]; + return val == ~0; +} + +static inline int test_bit_long_clear(unsigned long nr_base, const void *_addr) +{ + const unsigned long *addr = _addr; + unsigned long val = addr[nr_base / BITS_PER_LONG]; + return val == 0; +} + +static inline void clear_bit_long(unsigned long nr_base, void *_addr) +{ + unsigned long *addr = _addr; + addr[nr_base / BITS_PER_LONG] = 0; +} + +static inline void set_bit_long(unsigned long nr_base, void *_addr) +{ + unsigned long *addr = _addr; + addr[nr_base / BITS_PER_LONG] = ~0; +} #endif /* XC_BITOPS_H */