From patchwork Fri Oct 5 00:08:52 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: 189382 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 C03222C00B9 for ; Fri, 5 Oct 2012 10:47:40 +1000 (EST) Received: from localhost ([::1]:52081 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TJvUZ-0004av-UH for incoming@patchwork.ozlabs.org; Thu, 04 Oct 2012 20:10:11 -0400 Received: from eggs.gnu.org ([208.118.235.92]:37394) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TJvU3-0003oz-OV for qemu-devel@nongnu.org; Thu, 04 Oct 2012 20:09:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TJvU2-00025g-7d for qemu-devel@nongnu.org; Thu, 04 Oct 2012 20:09:39 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:42758) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TJvU2-0001gF-0Z for qemu-devel@nongnu.org; Thu, 04 Oct 2012 20:09:38 -0400 Received: by mail-pa0-f45.google.com with SMTP id fb10so1027227pad.4 for ; Thu, 04 Oct 2012 17:09:37 -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 :x-gm-message-state; bh=/8twHZcAKvX5DU20VrsFp1A60f9i7Fnu6bdoOe+nLOM=; b=UZ+pnCUHRWwM9P/UcSs8lwgaZ2jM+QAUGb3znPATlRqDVav9ZCBWv92CJrefcuSmSO vjadfHfrP5dpS5vqzr9Dr4nOKTsUOXWAgurfXNZtjA+Ot2JoTmcmaBdM9z/jv1cG5W26 +NHTAUY1JmSenc6C9OfmkWDQf9PnqX5S06LujU/0lKPzfG3HPbS3h+ZfpA83kgFCmQn4 mx8n7cz8bEB1hzYT31z8ErfxroQzjWCviPuG/ol0LahQFqQvZxuzs187KeCNWpT4VipS rzAHnm+nBQmcKb9/I9wYueXSuN/n3Wr376ifNe+ZfkpWO4mVgiKkiT0a6Lp9r4fqrwgx 6vVQ== Received: by 10.68.229.138 with SMTP id sq10mr26227783pbc.126.1349395777713; Thu, 04 Oct 2012 17:09:37 -0700 (PDT) Received: from localhost ([124.148.20.9]) by mx.google.com with ESMTPS id it6sm5081105pbc.14.2012.10.04.17.09.34 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 04 Oct 2012 17:09:37 -0700 (PDT) From: Peter Crosthwaite To: qemu-devel@nongnu.org, edgar.iglesias@gmail.com, blauwirbel@gmail.com, aliguori@us.ibm.com Date: Fri, 5 Oct 2012 10:08:52 +1000 Message-Id: <1349395739-26502-8-git-send-email-peter.crosthwaite@xilinx.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1349395739-26502-1-git-send-email-peter.crosthwaite@xilinx.com> References: <1349395739-26502-1-git-send-email-peter.crosthwaite@xilinx.com> X-Gm-Message-State: ALoCoQmmicRzINnXGEhfbgMdjnvhoau5Kw42GjoTX1HxikPFbDrjwtbS91J3v0dPpG87QWSvT22R X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.85.220.45 Cc: peter.crosthwaite@petalogix.com Subject: [Qemu-devel] [PATCH 07/14] 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 From: Peter A. G. Crosthwaite 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 ecdbe44..e18ae34 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 */