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[Qemu-devel] [PULL 01/21] range: add Range structure
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 01/21] range: add Range structure |
Date: |
Thu, 20 Jun 2013 16:08:10 +0300 |
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 <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
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 <inttypes.h>
+
+/*
+ * 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)
--
MST
- [Qemu-devel] [PULL 00/21] pci,net,misc enhancements, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 01/21] range: add Range structure,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 03/21] pc: pass PCI hole ranges to Guests, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 04/21] pc_piix: cleanup init compat handling, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 05/21] e1000: cleanup process_tx_desc, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 06/21] kvm: zero-initialize KVM_SET_GSI_ROUTING input, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 07/21] kvm: skip system call when msi route is unchanged, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 08/21] MAINTAINERS: s/Marcelo/Paolo/, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 09/21] pvpanic: initialization cleanup, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 10/21] pvpanic: fix fwcfg for big endian hosts, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 13/21] pci: Move pci_read_devaddr to pci-hotplug-old.c, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 14/21] pci: Abolish pci_find_root_bus(), Michael S. Tsirkin, 2013/06/20