tree e3b82fb6f93c3be7a59604273070ccbed0c5b1cc
parent 456f5e443590f6e130e514092e65e2c418f563c2
author Simon Glass <sjg@chromium.org> 1447051667 -0700
committer Simon Glass <sjg@chromium.org> 1447990070 -0700

Add a circular memory buffer implementation

This will be used to support console recording. It provides for a circular
buffer which can be written at the head and read from the tail. It supports
avoiding data copying by providing raw access to the data.

Signed-off-by: Simon Glass <sjg@chromium.org>