From patchwork Wed May 22 14:29:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yoshinori Sato X-Patchwork-Id: 1103373 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=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=users.sourceforge.jp Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 458FVj6CVMz9s5c for ; Thu, 23 May 2019 00:33:33 +1000 (AEST) Received: from localhost ([127.0.0.1]:44340 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hTSJ9-0002Of-QI for incoming@patchwork.ozlabs.org; Wed, 22 May 2019 10:33:31 -0400 Received: from eggs.gnu.org ([209.51.188.92]:53391) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hTSG2-00005v-0g for qemu-devel@nongnu.org; Wed, 22 May 2019 10:30:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hTSFz-0007T7-Ju for qemu-devel@nongnu.org; Wed, 22 May 2019 10:30:17 -0400 Received: from mail02.asahi-net.or.jp ([202.224.55.14]:44387) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hTSFz-00072L-8w for qemu-devel@nongnu.org; Wed, 22 May 2019 10:30:15 -0400 Received: from h61-195-96-97.vps.ablenet.jp (h61-195-96-97.ablenetvps.ne.jp [61.195.96.97]) (Authenticated sender: PQ4Y-STU) by mail02.asahi-net.or.jp (Postfix) with ESMTPA id 41AE23E19C; Wed, 22 May 2019 23:30:05 +0900 (JST) Received: from yo-satoh-debian.localdomain (v045049.dynamic.ppp.asahi-net.or.jp [124.155.45.49]) by h61-195-96-97.vps.ablenet.jp (Postfix) with ESMTPSA id 0F44A240086; Wed, 22 May 2019 23:30:04 +0900 (JST) From: Yoshinori Sato To: qemu-devel@nongnu.org Date: Wed, 22 May 2019 23:29:45 +0900 Message-Id: <20190522142956.41916-2-ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190522142956.41916-1-ysato@users.sourceforge.jp> References: <20190522142956.41916-1-ysato@users.sourceforge.jp> MIME-Version: 1.0 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 v15 01/12] 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 , philmd@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Yoshinori Sato Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé --- include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 3f0926cf40..764f9d1ea0 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 extract32(value, start, 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(uint16_t value, int start, int length) +{ + assert(start >= 0 && length > 0 && length <= 16 - start); + return extract32(value, start, length); +} + +/** * extract64: * @value: the value to extract the bit field from * @start: the lowest bit in the bit field (numbered from 0)