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[Qemu-devel] [PULL v2 01/21] range: add Range structure
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v2 01/21] range: add Range structure |
Date: |
Tue, 25 Jun 2013 18:40:40 +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 v2 00/21] pci,kvm,misc enhancements, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 01/21] range: add Range structure,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v2 03/21] pc: pass PCI hole ranges to Guests, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 06/21] kvm: zero-initialize KVM_SET_GSI_ROUTING input, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 05/21] e1000: cleanup process_tx_desc, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 12/21] pci: Move pci_read_devaddr to pci-hotplug-old.c, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 10/21] pvpanic: fix fwcfg for big endian hosts, Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 13/21] pci: Abolish pci_find_root_bus(), Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 14/21] pci: Use helper to find device's root bus in pci_find_domain(), Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 15/21] pci: Replace pci_find_domain() with more general pci_root_bus_path(), Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 16/21] pci: Add root bus argument to pci_get_bus_devfn(), Michael S. Tsirkin, 2013/06/25
- [Qemu-devel] [PULL v2 18/21] pci: Simpler implementation of primary PCI bus, Michael S. Tsirkin, 2013/06/25