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Mon, 07 Oct 2024 18:18:55 -0700 (PDT) Date: Mon, 7 Oct 2024 18:18:27 -0700 In-Reply-To: <20241008011852.1439154-1-tavip@google.com> Mime-Version: 1.0 References: <20241008011852.1439154-1-tavip@google.com> X-Mailer: git-send-email 2.47.0.rc0.187.ge670bccf7e-goog Message-ID: <20241008011852.1439154-2-tavip@google.com> Subject: [PATCH v2 01/25] fifo32: add peek function From: Octavian Purdila To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, stefanst@google.com, pbonzini@redhat.com, peter.maydell@linaro.org, marcandre.lureau@redhat.com, berrange@redhat.com, eduardo@habkost.net, luc@lmichel.fr, damien.hedde@dahe.fr, alistair@alistair23.me, thuth@redhat.com, philmd@linaro.org, jsnow@redhat.com, crosa@redhat.com, lvivier@redhat.com Received-SPF: pass client-ip=2607:f8b0:4864:20::44a; envelope-from=3f4gEZwUKCuAVCXKRIQQING.EQOSGOW-FGXGNPQPIPW.QTI@flex--tavip.bounces.google.com; helo=mail-pf1-x44a.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=-0.024, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.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..9de1807375 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_bufptr(&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.