From patchwork Tue Jun 18 14:17:18 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 252356 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id AC6F42C0079 for ; Wed, 19 Jun 2013 00:17:09 +1000 (EST) Received: from localhost ([::1]:52636 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UowiZ-0007tu-OW for incoming@patchwork.ozlabs.org; Tue, 18 Jun 2013 10:17:07 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35696) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uowi5-0007jl-Qo for qemu-devel@nongnu.org; Tue, 18 Jun 2013 10:16:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uowi2-00013I-Uk for qemu-devel@nongnu.org; Tue, 18 Jun 2013 10:16:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:25234) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uowi2-00013C-JS for qemu-devel@nongnu.org; Tue, 18 Jun 2013 10:16:34 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r5IEGW1i027100 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 18 Jun 2013 10:16:32 -0400 Received: from redhat.com (vpn1-5-182.ams2.redhat.com [10.36.5.182]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with SMTP id r5IEGU6N023292; Tue, 18 Jun 2013 10:16:30 -0400 Date: Tue, 18 Jun 2013 17:17:18 +0300 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Message-ID: <1371564986-11136-2-git-send-email-mst@redhat.com> References: <1371564986-11136-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1371564986-11136-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Maydell , kraxel@redhat.com, Paolo Bonzini Subject: [Qemu-devel] [PATCH v3 1/4] range: add Range structure 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 Sometimes we need to pass ranges around, add a handy structure for this purpose. Note: memory.c defines its own concept of AddrRange structure for working with 128 addresses. It's necessary there for doing range math. This is not needed for most users: struct Range is much simpler, and is only used for passing the range around. Cc: Peter Maydell Signed-off-by: Michael S. Tsirkin --- include/qemu/range.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/qemu/range.h b/include/qemu/range.h index 3502372..b76cc0d 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -1,6 +1,22 @@ #ifndef QEMU_RANGE_H #define QEMU_RANGE_H +#include + +/* + * Operations on 64 bit address ranges. + * Notes: + * - ranges must not wrap around 0, but can include the last byte ~0x0LL. + * - this can not represent a full 0 to ~0x0LL range. + */ + +/* A structure representing a range of addresses. */ +struct Range { + uint64_t begin; /* First byte of the range, or 0 if empty. */ + uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL. */ +}; +typedef struct Range Range; + /* Get last byte of a range from offset + length. * Undefined for ranges that wrap around 0. */ static inline uint64_t range_get_last(uint64_t offset, uint64_t len)