From 3ed0fb61a3dc912ef036d7ef450bed192090709e Mon Sep 17 00:00:00 2001 Message-Id: <3ed0fb61a3dc912ef036d7ef450bed192090709e.1387298827.git.minovotn@redhat.com> From: "Michael S. Tsirkin" Date: Tue, 17 Dec 2013 15:16:49 +0100 Subject: [PATCH 01/56] range: add Range structure RH-Author: Michael S. Tsirkin Message-id: <1387293161-4085-2-git-send-email-mst@redhat.com> Patchwork-id: 56306 O-Subject: [PATCH qemu-kvm RHEL7.0 v2 01/57] range: add Range structure Bugzilla: 1034876 RH-Acked-by: Igor Mammedov RH-Acked-by: Marcel Apfelbaum RH-Acked-by: Laszlo Ersek 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 (cherry picked from commit 620ac82eb0fc4218fb6a4937bcef3fdab3126703) --- include/qemu/range.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) Signed-off-by: Michal Novotny --- 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) -- 1.7.11.7