On Sun, 17 Oct 2010, wilbur.chan wrote: > I_u1(_j); They just make up pieces of asm opt code into a string > and copy them to ebase: > > memcpy((void *)ebase, final_handler, 0x100); > > > Why they did like this seemed strange to me, maybe in the > consideration of portability. This is a performance-critical piece of code that varies vastly across processors supported. As we started losing control of the original preprocessor-based approach and had no way to keep performance optimal this way anyway, late Thiemo Seufer came up with this brilliant solution of generating this code at the run time, early during bootstrap. This solution enabled us with tailoring code used specifically for each processor supported, up to including certain processor errata workarounds on the as-needed basis. Maciej
