From patchwork Wed Feb 12 13:02:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yoshinori Sato X-Patchwork-Id: 11378533 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 69C29138D for ; Wed, 12 Feb 2020 13:14:47 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 4B55F2086A for ; Wed, 12 Feb 2020 13:14:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4B55F2086A 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:37512 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1rqo-0006Gq-H5 for patchwork-qemu-devel@patchwork.kernel.org; Wed, 12 Feb 2020 08:14:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:33312) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1rg8-0004Z1-Q8 for qemu-devel@nongnu.org; Wed, 12 Feb 2020 08:03:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j1rfp-00087R-PV for qemu-devel@nongnu.org; Wed, 12 Feb 2020 08:03:44 -0500 Received: from mail03.asahi-net.or.jp ([202.224.55.15]:40848) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1j1rfn-00082o-Qv for qemu-devel@nongnu.org; Wed, 12 Feb 2020 08:03:24 -0500 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 mail03.asahi-net.or.jp (Postfix) with ESMTPA id 355ACDCA7C; Wed, 12 Feb 2020 22:03:20 +0900 (JST) Received: from yo-satoh-debian.localdomain (ae231051.dynamic.ppp.asahi-net.or.jp [14.3.231.51]) by h61-195-96-97.vps.ablenet.jp (Postfix) with ESMTPSA id 86FD4240090; Wed, 12 Feb 2020 22:03:19 +0900 (JST) From: Yoshinori Sato To: qemu-devel@nongnu.org Subject: [PATCH v30 02/22] qemu/bitops.h: Add extract8 and extract16 Date: Wed, 12 Feb 2020 22:02:51 +0900 Message-Id: <20200212130311.127515-3-ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200212130311.127515-1-ysato@users.sourceforge.jp> References: <20200212130311.127515-1-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: 202.224.55.15 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: richard.henderson@linaro.org, philmd@redhat.com, Yoshinori Sato Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Yoshinori Sato Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20190607091116.49044-10-ysato@users.sourceforge.jp> Tested-by: Philippe Mathieu-Daudé Signed-off-by: Richard Henderson --- include/qemu/bitops.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 02c1ce6a5d..f55ce8b320 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) return (value >> start) & (~0U >> (32 - 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