Add two special registers: MMID and DDR:
- MMID is write-only and the only side effect of writing to it is output
to the trace port, which is not emulated;
- DDR is only accessible in debug mode, which is not emulated.
Add two debug-mode-only opcodes:
- rfdd and rfdo do return from the debug mode, which is not emulated.
Add three internal opcodes for full MMU:
- hwwdtlba and hwwitlba are the internal opcodes that write a value into
autoupdate DTLB or ITLB entry.
- ldpte is internal opcode that loads PTE entry that covers the most
recent page fault address.
None of these three opcodes may appear in a valid instruction.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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