[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL v4 01/18] range: add Range structure
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v4 01/18] range: add Range structure |
Date: |
Sun, 7 Jul 2013 23:19:36 +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 v4 00/18] pci,misc enhancements, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 01/18] range: add Range structure,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v4 03/18] pc: pass PCI hole ranges to Guests, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 04/18] pc_piix: cleanup init compat handling, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 05/18] e1000: cleanup process_tx_desc, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 06/18] MAINTAINERS: s/Marcelo/Paolo/, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 08/18] pvpanic: fix fwcfg for big endian hosts, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 07/18] pvpanic: initialization cleanup, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 10/18] pci: Move pci_read_devaddr to pci-hotplug-old.c, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 09/18] pci: Cleanup configuration for pci-hotplug.c, Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 12/18] pci: Use helper to find device's root bus in pci_find_domain(), Michael S. Tsirkin, 2013/07/07
- [Qemu-devel] [PULL v4 13/18] pci: Replace pci_find_domain() with more general pci_root_bus_path(), Michael S. Tsirkin, 2013/07/07