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2017-09-11Implement log frameworkSoby Mathew
This patch gives users control over logging messages printed from the C code using the LOG macros defined in debug.h Users now have the ability to reduce the log_level at run time using the tf_log_set_max_level() function. The default prefix string can be defined by platform by overriding the `plat_log_get_prefix()` platform API which is also introduced in this patch. The new log framework results in saving of some RO data. For example, when BL1 is built for FVP with LOG_LEVEL=LOG_LEVEL_VERBOSE, resulted in saving 384 bytes of RO data and increase of 8 bytes of RW data. The framework also adds about 108 bytes of code to the release build of FVP. Fixes ARM-software/tf-issues#462 Change-Id: I476013d9c3deedfdd4c8b0b0f125665ba6250554 Co-authored-by: Eleanor Bonnici <Eleanor.bonnici@arm.com> Signed-off-by: Soby Mathew <soby.mathew@arm.com>