tree aa2befa32f7f5cb5cc377df88fce742b63be0608
parent 40a6f64795847f2b96ec24e9b11cb7002f0b48bf
author James Morrissey <james.morrissey@arm.com> 1392049139 +0000
committer Dan Handley <dan.handley@arm.com> 1392663103 +0000

Add IO abstraction framework

This is intended primarily for use as a storage abstraction.
It allows operations such as image-loading to be implemented
in a platform-independent fashion.  Each platform registers
a set of IO drivers during initialisation.  The platform must
also provide a function that will return a device and a specifier
that can be used to access specified content.

Clients of the API will primarily use device and entity handles.
The term "entity" is deliberately vague, to allow for different
representations of content accessed using different types of
specifier, but will often be interpreted as a "file" where the
specifier will normally be its path.

This commit builds, but is intended to be paired with a sample
implementation of "load_image" using a semi-hosting driver on FVP.

Change-Id: Id3b52f1c0eb9ce76b44b99fc6b6460803668cc86