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TBBR spec advocates for optional encryption of firmwares (see optional requirement: R060_TBBR_FUNCTION). So add an IO abstaction layer to support firmware decryption that can be stacked above any underlying IO/ packaging layer like FIP etc. It aims to provide a framework to load any encrypted IO payload. Also, add plat_get_enc_key_info() to be implemented in a platform specific manner as handling of encryption key may vary from one platform to another. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Change-Id: I9892e0ddf00ebecb8981301dbfa41ea23e078b03 |
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All headers under include/export/ are export headers that are intended for inclusion in third-party code which needs to interact with TF-A data structures or interfaces. They must follow these special rules: - Header guards should start with ARM_TRUSTED_FIRMWARE_ to reduce clash risk. - All definitions should be sufficiently namespaced (e.g. with BL_ or TF_) to make name clashes with third-party code unlikely. - They must not #include any headers except other export headers, and those includes must use relative paths with "../double_quotes.h" notation. - They must not rely on any type definitions other that <stdint.h> types defined in the ISO C standard (i.e. uint64_t is fine, but not u_register_t). They should still not #include <stdint.h>. Instead, wrapper headers including export headers need to ensure that they #include <stdint.h> earlier in their include order. - They must not rely on any macro definitions other than those which are pre-defined by all common compilers (e.g. __ASSEMBLER__ or __aarch64__). - They must only contain macro, type and structure definitions, no prototypes. - They should avoid using integer types with architecture-dependent widths (e.g. long, uintptr_t, pointer types) where possible. (Some existing export headers are violating this for now.) - Their names should always end in "_exp.h". - Normal TF-A code should never include export headers directly. Instead, it should include a wrapper header that ensures the export header is included in the right manner. (The wrapper header for include/export/x/y/z_exp.h should normally be placed at include/x/y/z.h.)