[Qemu-devel] [PATCH 1/7] pci: add range_covers_range()

[Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>]

This helper function allows map invalidation code to determine which
maps must be invalidated.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
---
 hw/pci.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/hw/pci.h b/hw/pci.h
index 4bd8a1a..5a6cdb5 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -419,6 +419,16 @@ static inline int range_covers_byte(uint64_t offset, uint64_t len,
     return offset <= byte && byte <= range_get_last(offset, len);
 }
 
+/* Check whether a given range completely covers another. */
+static inline int range_covers_range(uint64_t first_big, uint64_t len_big,
+                                     uint64_t first_small, uint64_t len_small)
+{
+    uint64_t last_big = range_get_last(first_big, len_big);
+    uint64_t last_small = range_get_last(first_small, len_small);
+
+    return first_big <= first_small && last_small <= last_big;
+}
+
 /* Check whether 2 given ranges overlap.
  * Undefined if ranges that wrap around 0. */
 static inline int ranges_overlap(uint64_t first1, uint64_t len1,
-- 
1.7.1