From patchwork Thu Jul 1 09:55:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olaf Hering X-Patchwork-Id: 12353835 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=-16.6 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,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 B237EC11F67 for ; Thu, 1 Jul 2021 09:56:54 +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 826E7611C2 for ; Thu, 1 Jul 2021 09:56:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 826E7611C2 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.148338.274154 (Exim 4.92) (envelope-from ) id 1lytR9-0004YZ-Gu; Thu, 01 Jul 2021 09:56:47 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 148338.274154; Thu, 01 Jul 2021 09:56:47 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lytR9-0004YQ-DP; Thu, 01 Jul 2021 09:56:47 +0000 Received: by outflank-mailman (input) for mailman id 148338; Thu, 01 Jul 2021 09:56:45 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lytR7-0004XT-T6 for xen-devel@lists.xenproject.org; Thu, 01 Jul 2021 09:56:45 +0000 Received: from mo4-p01-ob.smtp.rzone.de (unknown [85.215.255.50]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 94438a9c-bd82-4226-aad3-be2c35a408c7; Thu, 01 Jul 2021 09:56:45 +0000 (UTC) Received: from sender by smtp.strato.de (RZmta 47.28.1 AUTH) with ESMTPSA id 30791cx619ue5Md (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Thu, 1 Jul 2021 11:56:40 +0200 (CEST) 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: 94438a9c-bd82-4226-aad3-be2c35a408c7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1625133400; s=strato-dkim-0002; d=aepfle.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=DqV9Bza4xh4lmngXwj1J3LSRM3kpJQsPapKBO4Z/YvI=; b=qRRlDNFKwfDufQp5NUYrSrgtwMMfk6ATaFHjiH2amRD/NqCWF8dxxGWit6C8hcwGvg PY3/9ws3knYQO0b3lWTEK/A+csdqAk7ICvmTYNqADEesAA13Ryhnwo+BmJNb5LIzXrPz EKYRdzSJjdYT8BsvqMfD9JPD3+lLP589pKAvCUuKDpgmSUV/JW2P64aAeLvixE6CYdYi U7sPBkFcM9v9OjhSZXzDnc7W70rQIhHTfBrmSVJtviidhqsSSP6FQOLraTibzvWbejf1 Lib5d04DrwkNqIB50v5EgtPSt8d69WXfc30eQ2ehB57NnrZlLuZxPxnveDllsQDjy2sY NMbg== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P2EQZWCpfu+qG7CngxMFH1J+3q8wa/QXkBR9MXjAuzpIG0mv9coXAg5lqlz7EsstGyDcxK3Mbajr+SQKopp1Cb0CyyaZQQ==" X-RZG-CLASS-ID: mo00 From: Olaf Hering To: xen-devel@lists.xenproject.org Cc: Olaf Hering , Ian Jackson , Wei Liu , Juergen Gross Subject: [PATCH v20210701 02/40] tools: add API to work with sevaral bits at once Date: Thu, 1 Jul 2021 11:55:57 +0200 Message-Id: <20210701095635.15648-3-olaf@aepfle.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210701095635.15648-1-olaf@aepfle.de> References: <20210701095635.15648-1-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 multiple 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 v02: - change return type from int to bool (jgross) --- tools/libs/ctrl/xc_bitops.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/tools/libs/ctrl/xc_bitops.h b/tools/libs/ctrl/xc_bitops.h index f0bac4a071..8e8c6efb45 100644 --- a/tools/libs/ctrl/xc_bitops.h +++ b/tools/libs/ctrl/xc_bitops.h @@ -3,6 +3,7 @@ /* bitmap operations for single threaded access */ +#include #include #include @@ -77,4 +78,31 @@ static inline void bitmap_or(void *_dst, const void *_other, dst[i] |= other[i]; } +static inline bool 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 bool 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 */