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45 Merge branch cache-playground (r23-r30 and r34-r44) into trunk

This primarily adds the following features the the processor:
- A direct-mapped instruction cache with configurable cache line width and
number of cache lines.
- Various bug fixes for bugs that appeared when the processor could run
instructions at full speed but had to stall for data.
- A "Hello World" test application.		 skordal 3310d 07h /potato/trunk/
36 Ensure correct read of CSR after stall skordal 3310d 09h /potato/trunk/
35 Prevent jumping/branching when stalling skordal 3310d 09h /potato/trunk/
34 Prevent flushing the pipeline if it is stalling skordal 3310d 09h /potato/trunk/
28 Add rudimentary User's manual skordal 3324d 07h /potato/trunk/
26 Prevent exceptions from being taken while stalling

Jumping to an exception handler while stalling and waiting for a load/store
instruction to finish can cause undefined results from the load/store
instruction. This actually fixes the issue mentioned in revision r20.		 skordal 3324d 11h /potato/trunk/
24 Remove unused STRINGIFY macros skordal 3327d 05h /potato/trunk/
22 Fix the potato_get_badvaddr() macro skordal 3327d 06h /potato/trunk/
21 Upgrade the example design to use a 60 MHz system clock skordal 3327d 06h /potato/trunk/
20 Fix SHA256 benchmark crash by storing all registers on exception handler entry

This problem will disappear when the processor is updated to conform to the
new supervisor specification, which will allow us to use a compiler that
conforms to the new "official" ABI.		 skordal 3327d 06h /potato/trunk/
19 SHA256 benchmark: allow compiler to inline at will skordal 3327d 06h /potato/trunk/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3329d 06h /potato/trunk/
17 Improve detection of unaligned instructions skordal 3333d 13h /potato/trunk/
16 Correct grammar in source code comment skordal 3333d 13h /potato/trunk/
15 SHA256 benchmark: fix Makefile syntax error skordal 3340d 06h /potato/trunk/
14 Improve detection of invalid instructions skordal 3340d 07h /potato/trunk/
13 Add SHA256 benchmark code skordal 3340d 11h /potato/trunk/
12 Update example design with correct bug-report URL and testbenches skordal 3340d 13h /potato/trunk/
11 Correct FIFO file header skordal 3340d 13h /potato/trunk/
10 Add missing FIFO module skordal 3345d 07h /potato/trunk/
9 Remove dependency on a non-existent target in the Makefile skordal 3345d 07h /potato/trunk/
8 Clarify instruction ROM naming in the example design README skordal 3352d 10h /potato/trunk/
7 Add test design for the Nexys 4 board from Digilent skordal 3352d 10h /potato/trunk/
6 Add ISA tests skordal 3352d 10h /potato/trunk/
5 Update the README, remove .md extension skordal 3354d 15h /potato/trunk/
4 Add license skordal 3354d 16h /potato/trunk/
3 Fix bug reporting URL skordal 3354d 16h /potato/trunk/
2 Initial commit skordal 3354d 18h /potato/trunk/
1 The project and the structure was created root 3365d 21h /potato/trunk/

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