From patchwork Sat Aug 17 10:25:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Octavian Purdila X-Patchwork-Id: 13767144 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9461FC52D7F for ; Sat, 17 Aug 2024 10:32:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sfGe0-0006QE-4k; Sat, 17 Aug 2024 06:26:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <3wXrAZgUKCvQpWrelckkcha.Ykimaiq-Zarahjkjcjq.knc@flex--tavip.bounces.google.com>) id 1sfGde-0006Cc-KU for qemu-devel@nongnu.org; Sat, 17 Aug 2024 06:26:26 -0400 Received: from mail-yw1-x114a.google.com ([2607:f8b0:4864:20::114a]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <3wXrAZgUKCvQpWrelckkcha.Ykimaiq-Zarahjkjcjq.knc@flex--tavip.bounces.google.com>) id 1sfGdQ-00036j-C4 for qemu-devel@nongnu.org; Sat, 17 Aug 2024 06:26:22 -0400 Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-6b0f068833bso28572997b3.0 for ; Sat, 17 Aug 2024 03:26:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1723890370; x=1724495170; darn=nongnu.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=g0XCLUPYxGQ5i0atXjj8FMDAblhXlT56A5I6yFI98jg=; b=Q7x4fsAh9vMLnZpJ7qWruB1NmTkEJRGX10fMr/hge24uMMm3IeWxJiFe6BgAYyPKS3 P57LBtj1FwqmLUOJFyIqycj+3P+SS8GcaFWhN1/ebnV7lxF2ejzyc1ZK704wqDwM5Y21 0SZ+lwkDrwqORRvlmXTN92WuYewJYxfqQ5CT9QUaIJxNX2VMl9EEHijslWmvawB5JhDm uYGFGbsYFBdtHi9DeV2DkM0kHRczo2WQNDrKtk2yqeYNhjaetM1iq2uF9vq2ZuwBcF6W lrcwcyEZFJCm0L2A5MZ7xVRyjSjMeeLxkNrltt69D9nOzzXbsEKM0O/el+xstCQm9POx N5TQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723890370; x=1724495170; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=g0XCLUPYxGQ5i0atXjj8FMDAblhXlT56A5I6yFI98jg=; b=bfRivoQBbEGHZOYcuDw9FpqzzLlz4QwJeuch3wRe83yNVbENKl8JkZ7PZA5FkOMmAs wXWpjaTQ8VLHf0188gvQzz6r+FPleAVSnO4ZQuLQqHzfKzD6+OOfUZvfcEFpoSYDI2fG 74U2blU9u+jtKe179eWAQE6oHNgm5hd3w/V9W+xPkLC4XppT2ok+XkCYzxu+k6RJzW8E GOO1WvVHTTJKUgXtA2eEEO824sRHLMbEYQI7q60Qwbk69DGMVIANULAUtaf3/s8jXhNZ 5Dw9bsovL28fDhMyeYE6Jcoqx5ct96s+6SLH368Wxd3OpfO7RsrTc3YCbdAbPmXVlaSb LwVw== X-Gm-Message-State: AOJu0Yx20Qav3rPA9xHD0eLoA74XbQS02h82lUTKkLGyiSQaS0L71hN3 JIIO1hURwEZ1SJrjySQ1c6LbOstA2bVMp0M26WjDiTcIr0uWKVWTi39uPzMco7TSDKHrF3y41pn 3V3S1cbiReF1BXQ/2tCyWRVTXbMsQHsrF80eMrHdW06mAc4QHlmF7w1XK7PBOGpP0MWnO4vOj3x /mlyizkiL4OHLiSGl/fS++/0H0Wg== X-Google-Smtp-Source: AGHT+IEjqPwwlvxkTbqI/APwlgmkxDAH5a+wlakPZeTgxGE/w9Me6YrIxF2K9dgDFS1r1NG59+hJeA4a3A== X-Received: from warp10.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:750]) (user=tavip job=sendgmr) by 2002:a25:910e:0:b0:e0b:a34d:f223 with SMTP id 3f1490d57ef6-e116cecab95mr126463276.5.1723890369867; Sat, 17 Aug 2024 03:26:09 -0700 (PDT) Date: Sat, 17 Aug 2024 03:25:44 -0700 In-Reply-To: <20240817102606.3996242-1-tavip@google.com> Mime-Version: 1.0 References: <20240817102606.3996242-1-tavip@google.com> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog Message-ID: <20240817102606.3996242-2-tavip@google.com> Subject: [RFC PATCH v2 01/23] fifo32: add peek function From: Octavian Purdila To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, stefanst@google.com, pbonzini@redhat.com, thuth@redhat.com, peter.maydell@linaro.org, marcandre.lureau@redhat.com, alistair@alistair23.me, berrange@redhat.com, philmd@linaro.org, jsnow@redhat.com, crosa@redhat.com Received-SPF: pass client-ip=2607:f8b0:4864:20::114a; envelope-from=3wXrAZgUKCvQpWrelckkcha.Ykimaiq-Zarahjkjcjq.knc@flex--tavip.bounces.google.com; helo=mail-yw1-x114a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add fifo32_peek() that returns the first element from the queue without popping it. Signed-off-by: Octavian Purdila --- include/qemu/fifo32.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/include/qemu/fifo32.h b/include/qemu/fifo32.h index 4e9fd1b5ef..77aab488ae 100644 --- a/include/qemu/fifo32.h +++ b/include/qemu/fifo32.h @@ -140,6 +140,34 @@ static inline uint32_t fifo32_pop(Fifo32 *fifo) return ret; } +/** + * fifo32_peek: + * @fifo: fifo to peek at + * + * Returns the value from the FIFO's head without poping it. Behaviour + * is undefined if the FIFO is empty. Clients are responsible for + * checking for emptiness using fifo32_is_empty(). + * + * Returns: the value from the FIFO's head + */ + +static inline uint32_t fifo32_peek(Fifo32 *fifo) +{ + uint32_t ret = 0, num; + const uint8_t *buf; + + buf = fifo8_peek_buf(&fifo->fifo, 4, &num); + if (num != 4) { + return ret; + } + + for (int i = 0; i < sizeof(uint32_t); i++) { + ret |= buf[i] << (i * 8); + } + + return ret; +} + /** * There is no fifo32_pop_buf() because the data is not stored in the buffer * as a set of native-order words.