Additionally the runtime is dependent on a small utility library which provides simple common functions, limited operating system and compiler abstraction, as well as atomic operation interfaces.
The C interface layer provides C99 APIs as defined in the HSA Runtime Specification 1.1. The interfaces and default definitions for the standard extensions are also provided. The interface functions simply forward to a function pointer table defined here. The table is initialized to point to default definitions, which simply return an appropriate error code. If available the extension library is loaded as part of runtime initialization and the table is updated to point into the extension library. In this release the standard extensions (image support and finalizer) are implemented in a separate libraries (not open sourced), and can be obtained from the HSA-Runtime-AMD git repository.
The C++ interface layer provides abstract interface classes encapsulating commands to HSA Signals, Agents, and Queues. This layer also contains the implementation of device independent commands, such as hsa_init and hsa_system_get_info, and a default signal and queue implementation.
* hsa_agent_get_exception_policies is not implemented.
* Image import/export/copy/fill only support image created with memory from host accessible region.
* hsa_system_get_extension_table is not implemented for HSA_EXTENSION_AMD_PROFILER.
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