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[Qemu-devel] [PULL 03/14] range: add min/max operations on ranges
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 03/14] range: add min/max operations on ranges |
Date: |
Sun, 29 Sep 2013 09:59:58 +0300 |
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/qemu/range.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/qemu/range.h b/include/qemu/range.h
index 4a0780d..aae9720 100644
--- a/include/qemu/range.h
+++ b/include/qemu/range.h
@@ -17,6 +17,24 @@ struct Range {
uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL.
*/
};
+static inline void range_extend(Range *range, Range *extend_by)
+{
+ if (!extend_by->begin && !extend_by->end) {
+ return;
+ }
+ if (!range->begin && !range->end) {
+ *range = *extend_by;
+ return;
+ }
+ if (range->begin > extend_by->begin) {
+ range->begin = extend_by->begin;
+ }
+ /* Compare last byte in case region ends at ~0x0LL */
+ if (range->end - 1 < extend_by->end - 1) {
+ range->end = extend_by->end;
+ }
+}
+
/* 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 00/14] pc,pci,virtio fixes and cleanups, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 01/14] q35: make pci window address/size match guest cfg, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 02/14] range: add Range to typedefs, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 03/14] range: add min/max operations on ranges,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 04/14] pci: add helper to retrieve the 64-bit range, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 05/14] q35: use 64 bit window programmed by guest, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 07/14] piix4: disable io on reset, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 06/14] piix: use 64 bit window programmed by guest, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 08/14] pci: remove explicit check to 64K ioport size, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 09/14] virtio-net: fix up HMP NIC info string on reset, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 10/14] smbios: Normalize smbios_entry_add()'s error handling to exit(1), Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 11/14] smbios: Convert to QemuOpts, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 12/14] smbios: Improve diagnostics for conflicting entries, Michael S. Tsirkin, 2013/09/29
- [Qemu-devel] [PULL 13/14] smbios: Make multiple -smbios type= accumulate sanely, Michael S. Tsirkin, 2013/09/29