From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 B36B6C04A6B for ; Wed, 8 May 2019 15:01:20 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 89CA720989 for ; Wed, 8 May 2019 15:01:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 89CA720989 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=users.sourceforge.jp Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:38664 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hOO4N-0006RX-Pb for qemu-devel@archiver.kernel.org; Wed, 08 May 2019 11:01:19 -0400 Received: from eggs.gnu.org ([209.51.188.92]:32987) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hONzm-0002pG-Nf for qemu-devel@nongnu.org; Wed, 08 May 2019 10:56:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hONzg-000851-UW for qemu-devel@nongnu.org; Wed, 08 May 2019 10:56:34 -0400 Received: from mail02.asahi-net.or.jp ([202.224.55.14]:46420) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hONzg-00083U-K4 for qemu-devel@nongnu.org; Wed, 08 May 2019 10:56:28 -0400 Received: from h61-195-96-97.vps.ablenet.jp (h61-195-96-97.vps.ablenet.jp [61.195.96.97]) (Authenticated sender: PQ4Y-STU) by mail02.asahi-net.or.jp (Postfix) with ESMTPA id D8CDD3C107; Wed, 8 May 2019 23:56:27 +0900 (JST) Received: from ysato.dip.jp (v096129.dynamic.ppp.asahi-net.or.jp [124.155.96.129]) by h61-195-96-97.vps.ablenet.jp (Postfix) with ESMTPSA id 6F1E4240085; Wed, 8 May 2019 23:56:27 +0900 (JST) From: Yoshinori Sato To: qemu-devel@nongnu.org Date: Wed, 8 May 2019 23:56:11 +0900 Message-Id: <20190508145611.107133-14-ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190508145611.107133-1-ysato@users.sourceforge.jp> References: <20190508145611.107133-1-ysato@users.sourceforge.jp> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 202.224.55.14 Subject: [Qemu-devel] [PATCH v10 13/13] qemu/bitops.h: Add extract8 and extract16 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: peter.maydell@linaro.org, richard.henderson@linaro.org, Yoshinori Sato Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Yoshinori Sato --- include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 3f0926cf40..0dfd81efb2 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -301,6 +301,44 @@ static inline uint32_t extract32(uint32_t value, int start, int length) } /** + * extract8: + * @value: the value to extract the bit field from + * @start: the lowest bit in the bit field (numbered from 0) + * @length: the length of the bit field + * + * Extract from the 8 bit input @value the bit field specified by the + * @start and @length parameters, and return it. The bit field must + * lie entirely within the 8 bit word. It is valid to request that + * all 8 bits are returned (ie @length 8 and @start 0). + * + * Returns: the value of the bit field extracted from the input value. + */ +static inline uint8_t extract8(uint8_t value, int start, int length) +{ + assert(start >= 0 && length > 0 && length <= 8 - start); + return (value >> start) & (~0U >> (32 - length)); +} + +/** + * extract16: + * @value: the value to extract the bit field from + * @start: the lowest bit in the bit field (numbered from 0) + * @length: the length of the bit field + * + * Extract from the 16 bit input @value the bit field specified by the + * @start and @length parameters, and return it. The bit field must + * lie entirely within the 16 bit word. It is valid to request that + * all 16 bits are returned (ie @length 16 and @start 0). + * + * Returns: the value of the bit field extracted from the input value. + */ +static inline uint16_t extract16(uint32_t value, int start, int length) +{ + assert(start >= 0 && length > 0 && length <= 16 - start); + return (value >> start) & (~0U >> (32 - length)); +} + +/** * extract64: * @value: the value to extract the bit field from * @start: the lowest bit in the bit field (numbered from 0) -- 2.11.0