Full PIC 8259 configuration API for x86 systems #8
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…e of PIC controller.
…e API and overall capability.
…ledMode. Added poll command to perform interrupt polling.
…o use it in chained configuration. Added proper asserts. Added function to swap modes at runtime. Added example at the top of this module.
… between modes. Added all EOI routine for all modes. Saving poll flag from being cleared when reading the IRR or ISR. Added the priority change function. Added the special mask mode handling.
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The whole implementation was rewritten with all main API function preserved. The reimplementation aligns with the Intel datasheet specifications, with proper operation modes and spurious interrupts handling. (Features for x86 which are not well described within the datasheet are not implemented)
Main changes: