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From 3ed0fb61a3dc912ef036d7ef450bed192090709e Mon Sep 17 00:00:00 2001
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Message-Id: <3ed0fb61a3dc912ef036d7ef450bed192090709e.1387298827.git.minovotn@redhat.com>
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Date: Tue, 17 Dec 2013 15:16:49 +0100
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Subject: [PATCH 01/56] range: add Range structure
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RH-Author: Michael S. Tsirkin <mst@redhat.com>
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Message-id: <1387293161-4085-2-git-send-email-mst@redhat.com>
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Patchwork-id: 56306
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O-Subject: [PATCH qemu-kvm RHEL7.0 v2 01/57] range: add Range structure
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Bugzilla: 1034876
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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Sometimes we need to pass ranges around, add a
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handy structure for this purpose.
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Note: memory.c defines its own concept of AddrRange structure for
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working with 128 addresses. It's necessary there for doing range math.
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This is not needed for most users: struct Range is
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much simpler, and is only used for passing the range around.
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Cc: Peter Maydell <peter.maydell@linaro.org>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 620ac82eb0fc4218fb6a4937bcef3fdab3126703)
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---
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include/qemu/range.h | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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include/qemu/range.h | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/include/qemu/range.h b/include/qemu/range.h
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index 3502372..b76cc0d 100644
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--- a/include/qemu/range.h
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+++ b/include/qemu/range.h
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@@ -1,6 +1,22 @@
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#ifndef QEMU_RANGE_H
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#define QEMU_RANGE_H
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+#include <inttypes.h>
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+
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+/*
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+ * Operations on 64 bit address ranges.
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+ * Notes:
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+ * - ranges must not wrap around 0, but can include the last byte ~0x0LL.
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+ * - this can not represent a full 0 to ~0x0LL range.
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+ */
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+
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+/* A structure representing a range of addresses. */
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+struct Range {
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+ uint64_t begin; /* First byte of the range, or 0 if empty. */
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+ uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL. */
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+};
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+typedef struct Range Range;
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+
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/* Get last byte of a range from offset + length.
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* Undefined for ranges that wrap around 0. */
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static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
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--
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1.7.11.7
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