From patchwork Tue Sep 18 02:11:04 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Peter A. G. Crosthwaite" X-Patchwork-Id: 184594 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id A8DB32C0086 for ; Tue, 18 Sep 2012 12:57:38 +1000 (EST) Received: from localhost ([::1]:53481 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDnJO-00070P-2d for incoming@patchwork.ozlabs.org; Mon, 17 Sep 2012 22:13:18 -0400 Received: from eggs.gnu.org ([208.118.235.92]:45760) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDnIX-0005HR-1X for qemu-devel@nongnu.org; Mon, 17 Sep 2012 22:12:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TDnIV-0004SX-EM for qemu-devel@nongnu.org; Mon, 17 Sep 2012 22:12:24 -0400 Received: from mail-oa0-f45.google.com ([209.85.219.45]:60268) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TDnIV-0004LZ-8v for qemu-devel@nongnu.org; Mon, 17 Sep 2012 22:12:23 -0400 Received: by mail-oa0-f45.google.com with SMTP id n12so5201914oag.4 for ; Mon, 17 Sep 2012 19:12:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references :in-reply-to:references:x-gm-message-state; bh=xd4aIxZa3NbG1GZSOtXIzktO7AwQcOCuPnooO4yZCPg=; b=dhky1zgChP1ZSi1GRsgL9ecbbIs1Fy8phwSlFKLd4CZ8Gz9GAahXh0W0k7Q+f74Auk fKPKurnXUIN5llP8YxoSoTMdcK+dM/rJjqsL0YmZWfWHV9p7NSDuEITZSKx/Dqjm+Ogc jJq5gdlvrtw367+h85wnsyDHF4MYsbeYOUMkYgQ8hOvAoFctMjQxVvkfm7/zf6IfJIhu ZwPKc6qPNlx/3UA60EesUN2CKHEbG4ysKUBDll+6YZT5vrVkPHmMkirMXO5nlt+YVC4A aNJS0DMv8+FLt+xlr156V2gy0q1sg6SM2EKvu7RjHDV/ySjD9gQ7Gp8VMjMYdzTMFUyC 63Jw== Received: by 10.60.172.143 with SMTP id bc15mr13824451oec.73.1347934343053; Mon, 17 Sep 2012 19:12:23 -0700 (PDT) Received: from localhost ([124.148.20.9]) by mx.google.com with ESMTPS id qd7sm12807042obc.5.2012.09.17.19.12.19 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 17 Sep 2012 19:12:22 -0700 (PDT) From: "Peter A. G. Crosthwaite" To: qemu-devel@nongnu.org, paul@codesourcery.com, edgar.iglesias@gmail.com, peter.maydell@linaro.org, stefanha@gmail.com Date: Tue, 18 Sep 2012 12:11:04 +1000 Message-Id: X-Mailer: git-send-email 1.7.0.4 In-Reply-To: References: In-Reply-To: References: X-Gm-Message-State: ALoCoQm7LNqyHlrevcXVGg5YTH99BL6/x9NhwxvXKy7VA4HI0ZAomJOlf1GwWYJRyNoTfRtFeOJP X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.85.219.45 Cc: "Peter A. G. Crosthwaite" , i.mitsyanko@samsung.com Subject: [Qemu-devel] [PATCH v6 07/13] hw: Added generic FIFO API. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 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 Added a FIFO API that can be used to create and operate byte FIFOs. Signed-off-by: Peter A. G. Crosthwaite --- hw/Makefile.objs | 1 + hw/fifo.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ hw/fifo.h | 47 ++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+), 0 deletions(-) create mode 100644 hw/fifo.c create mode 100644 hw/fifo.h diff --git a/hw/Makefile.objs b/hw/Makefile.objs index 6dfebd2..dcb0bcd 100644 --- a/hw/Makefile.objs +++ b/hw/Makefile.objs @@ -15,6 +15,7 @@ hw-obj-$(CONFIG_ECC) += ecc.o hw-obj-$(CONFIG_NAND) += nand.o hw-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o hw-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o +hw-obj-y += fifo.o hw-obj-$(CONFIG_M48T59) += m48t59.o hw-obj-$(CONFIG_ESCC) += escc.o diff --git a/hw/fifo.c b/hw/fifo.c new file mode 100644 index 0000000..366dae4 --- /dev/null +++ b/hw/fifo.c @@ -0,0 +1,78 @@ +/* + * Generic FIFO component, implemented as a circular buffer. + * + * Copyright (c) 2012 Peter A. G. Crosthwaite + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ + +#include "fifo.h" + +void fifo8_create(Fifo8 *fifo, uint32_t capacity) +{ + fifo->data = g_new(uint8_t, capacity); + fifo->capacity = capacity; + fifo->head = 0; + fifo->num = 0; +} + +void fifo8_destroy(Fifo8 *fifo) +{ + g_free(fifo->data); +} + +void fifo8_push(Fifo8 *fifo, uint8_t data) +{ + if (fifo->num == fifo->capacity) { + abort(); + } + fifo->data[(fifo->head + fifo->num) % fifo->capacity] = data; + fifo->num++; +} + +uint8_t fifo8_pop(Fifo8 *fifo) +{ + uint8_t ret; + + if (fifo->num == 0) { + abort(); + } + ret = fifo->data[fifo->head++]; + fifo->head %= fifo->capacity; + fifo->num--; + return ret; +} + +void fifo8_reset(Fifo8 *fifo) +{ + fifo->num = 0; +} + +bool fifo8_is_empty(Fifo8 *fifo) +{ + return (fifo->num == 0); +} + +bool fifo8_is_full(Fifo8 *fifo) +{ + return (fifo->num == fifo->capacity); +} + +const VMStateDescription vmstate_fifo8 = { + .name = "SSISlave", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .fields = (VMStateField[]) { + VMSTATE_VBUFFER_UINT32(data, Fifo8, 1, NULL, 0, capacity), + VMSTATE_UINT32(head, Fifo8), + VMSTATE_UINT32(num, Fifo8), + VMSTATE_END_OF_LIST() + } +}; diff --git a/hw/fifo.h b/hw/fifo.h new file mode 100644 index 0000000..3fb09ff --- /dev/null +++ b/hw/fifo.h @@ -0,0 +1,47 @@ +#ifndef FIFO_H +#define FIFO_H + +#include "hw.h" + +typedef struct { + /* All fields are private */ + uint8_t *data; + uint32_t capacity; + uint32_t head; + uint32_t num; +} Fifo8; + +/* create a fifo of the specified size */ + +void fifo8_create(Fifo8 *, uint32_t); + +/* cleanup a fifo */ + +void fifo8_destroy(Fifo8 *); + +/* push a data byte to the fifo. Behaviour is undefined if the fifo is full */ + +void fifo8_push(Fifo8 *, uint8_t); + +/* pop a data byte from the fifo. Behviour is undefined if the fifo is empty */ + +uint8_t fifo8_pop(Fifo8 *); + +/* reset (empty) the fifo */ + +void fifo8_reset(Fifo8 *); + +bool fifo8_is_empty(Fifo8 *); +bool fifo8_is_full(Fifo8 *); + +extern const VMStateDescription vmstate_fifo8; + +#define VMSTATE_FIFO8(_field, _state) { \ + .name = (stringify(_field)), \ + .size = sizeof(Fifo8), \ + .vmsd = &vmstate_fifo8, \ + .flags = VMS_STRUCT, \ + .offset = vmstate_offset_value(_state, _field, Fifo8), \ +} + +#endif /* FIFO_H */