Add cache handling functions

Add MRU page cache mechanism.
The page are accessed by their address.

Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com>
Signed-off-by: Petter Svard <petters@cs.umu.se>
Signed-off-by: Aidan Shribman <aidan.shribman@sap.com>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>

Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/cutils.c b/cutils.c
index 9d4c570939..35e2e2bf44 100644
--- a/cutils.c
+++ b/cutils.c
@@ -382,3 +382,12 @@ int qemu_parse_fd(const char *param)
     }
     return fd;
 }
+
+/* round down to the nearest power of 2*/
+int64_t pow2floor(int64_t value)
+{
+    if (!is_power_of_2(value)) {
+        value = 0x8000000000000000ULL >> clz64(value);
+    }
+    return value;
+}