simplified eidelivery and IMSIC-like CSRs #617
Description
with reference to section 3.1 of the spec
- there is no provision for ACLIC and IMSIC to coexist, so the spec does not need to talk about IMSIC. Except possibly to say - "ACLIC provides an indirect eidelivery CSR, as in an AIA IMSIC".
- since the ACLIC owns the eidelivery register, there is no need for an "interrupt delivery from ACLIC" eidelivery value (it would only be needed if the hart could have both an ACLIC and IMSIC - a possibility not covered by the spec).
- let eip and eie be defined as they are for AIA IMSIC, call this "the AIA interface for hart-local external interrupt controllers"
- All the text explaining that eithreshold is an alias of ithreshold, eip relationship to setip and clrip etc. falls away because there are no APLIC like setip, clrip etc. registers (there is no description of those registers elsewhere in aclic.adoc)
- Remove references to "connected APLIC domain" because there is no APLIC.