Julius Werner d8dcfd56b5 UPSTREAM: libpayload: cbfs: Add cbfs_handle API for more fine-grained accesses ... The libpayload CBFS APIs are pretty old and clunky, primarily because of the way the cbfs_media struct may or may not be passed in and may be initialized inside the API calls in a way that cannot be passed back out again. Due to this, the only real CBFS access function we have always reads a whole file with all metadata, and everything else has to build on top of that. This makes certain tasks like reading just a file attribute very inefficient on non-memory-mapped platforms (because you always have to map the whole file). This patch isn't going to fix the world, but will allow a bit more flexibility by bolting a new API on top which uses a struct cbfs_handle to represent a found but not yet read file. A cbfs_handle contains a copy of the cbfs_media needed to read the file, so it can be kept and passed around to read individual parts of it after the initial lookup. The existing (non-media) legacy API is retained for backwards compatibility, as is cbfs_file_get_contents() (which is most likely what more recent payloads would have used, and also a good convenience wrapper for the most simple use case), but they are now implemented on top of the new API. CQ-DEPEND=CL:344602 BRANCH=None BUG=None TEST=Booted Oak, made sure that firmware screens and software sync worked okay. Change-Id: I269f3979e77ae691ee9d4e1ab564eff6d45b7cbe Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/14810 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org> (cherry picked from commit 2296479dfd) Reviewed-on: https://chromium-review.googlesource.com/344459 Reviewed-on: https://chromium-review.googlesource.com/346298 Reviewed-by: Aaron Durbin <adurbin@google.com> Reviewed-by: Stefan Reinauer <reinauer@google.com> Commit-Queue: Martin Roth <martinroth@chromium.org> Trybot-Ready: Martin Roth <martinroth@chromium.org> Tested-by: Martin Roth <martinroth@chromium.org>		2016-05-20 18:31:43 +00:00
..
cbfs.c	UPSTREAM: libpayload: cbfs: Add cbfs_handle API for more fine-grained accesses	2016-05-20 18:31:43 +00:00
cbfs_core.c	UPSTREAM: libpayload: cbfs: Add cbfs_handle API for more fine-grained accesses	2016-05-20 18:31:43 +00:00
Makefile.inc	Remove empty lines at end of file	2015-06-08 00:55:07 +02:00
ram_media.c	libpayload: cbfs: Fix ram_media map() error return value	2015-03-21 11:04:39 +01:00