From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48437) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TPyht-0007l4-K1 for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:48:58 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TPyhs-0006Us-Eq for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:48:57 -0400 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:49634) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TPyhr-0006Rw-TF for qemu-devel@nongnu.org; Sun, 21 Oct 2012 12:48:56 -0400 Received: from /spool/local by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 22 Oct 2012 02:45:36 +1000 Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q9LGcq6253608470 for ; Mon, 22 Oct 2012 03:38:52 +1100 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q9LGmk6A006761 for ; Mon, 22 Oct 2012 03:48:46 +1100 From: Lei Li Date: Mon, 22 Oct 2012 00:47:57 +0800 Message-Id: <1350838081-6351-2-git-send-email-lilei@linux.vnet.ibm.com> In-Reply-To: <1350838081-6351-1-git-send-email-lilei@linux.vnet.ibm.com> References: <1350838081-6351-1-git-send-email-lilei@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 1/5] qemu-char: Add new char backend CircularMemCharDriver List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: blauwirbel@gmail.com, aliguori@us.ibm.com, Lei Li , lcapitulino@redhat.com Signed-off-by: Lei Li --- qemu-char.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 72 insertions(+), 0 deletions(-) diff --git a/qemu-char.c b/qemu-char.c index b082bae..b174da1 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2588,6 +2588,78 @@ size_t qemu_chr_mem_osize(const CharDriverState *chr) return d->outbuf_size; } +/*********************************************************/ +/*CircularMemoryr chardev*/ + +typedef struct { + size_t size; + size_t producer; + size_t consumer; + uint8_t *cbuf; +} CirMemCharDriver; + +static bool cirmem_chr_is_empty(const CharDriverState *chr) +{ + const CirMemCharDriver *d = chr->opaque; + + return d->producer == d->consumer; +} + +static bool cirmem_chr_is_full(const CharDriverState *chr) +{ + const CirMemCharDriver *d = chr->opaque; + + return (d->producer - d->consumer) >= d->size; +} + +static int cirmem_chr_write(CharDriverState *chr, const uint8_t *buf, int len) +{ + CirMemCharDriver *d = chr->opaque; + int i; + + if (len < 0) { + return -1; + } + + /* The size should be a power of 2. */ + for (i = 0; i < len; i++ ) { + d->cbuf[d->producer % d->size] = buf[i]; + d->producer++; + } + + return 0; +} + +static int cirmem_chr_read(CharDriverState *chr, uint8_t *buf, int len) +{ + CirMemCharDriver *d = chr->opaque; + int i; + + if (cirmem_chr_is_empty(chr) || len < 0) { + return -1; + } + + if (len > d->size) { + len = d->size; + } + + for (i = 0; i < len; i++) { + buf[i] = d->cbuf[d->consumer % d->size]; + d->consumer++; + } + + return 0; +} + +static void cirmem_chr_close(struct CharDriverState *chr) +{ + CirMemCharDriver *d = chr->opaque; + + g_free(d); + g_free(chr->opaque); + chr->opaque = NULL; +} + QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename) { char host[65], port[33], width[8], height[8]; -- 1.7.7.6