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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 19h /potato/trunk/
36 Ensure correct read of CSR after stall skordal 3310d 21h /potato/trunk/
35 Prevent jumping/branching when stalling skordal 3310d 21h /potato/trunk/
34 Prevent flushing the pipeline if it is stalling skordal 3310d 21h /potato/trunk/
28 Add rudimentary User's manual skordal 3324d 18h /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 23h /potato/trunk/
24 Remove unused STRINGIFY macros skordal 3327d 16h /potato/trunk/
22 Fix the potato_get_badvaddr() macro skordal 3327d 17h /potato/trunk/
21 Upgrade the example design to use a 60 MHz system clock skordal 3327d 17h /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 17h /potato/trunk/
19 SHA256 benchmark: allow compiler to inline at will skordal 3327d 17h /potato/trunk/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3329d 17h /potato/trunk/
17 Improve detection of unaligned instructions skordal 3334d 00h /potato/trunk/
16 Correct grammar in source code comment skordal 3334d 00h /potato/trunk/
15 SHA256 benchmark: fix Makefile syntax error skordal 3340d 17h /potato/trunk/
14 Improve detection of invalid instructions skordal 3340d 18h /potato/trunk/
13 Add SHA256 benchmark code skordal 3340d 22h /potato/trunk/
12 Update example design with correct bug-report URL and testbenches skordal 3341d 01h /potato/trunk/
11 Correct FIFO file header skordal 3341d 01h /potato/trunk/
10 Add missing FIFO module skordal 3345d 19h /potato/trunk/
9 Remove dependency on a non-existent target in the Makefile skordal 3345d 19h /potato/trunk/
8 Clarify instruction ROM naming in the example design README skordal 3352d 21h /potato/trunk/
7 Add test design for the Nexys 4 board from Digilent skordal 3352d 21h /potato/trunk/
6 Add ISA tests skordal 3352d 21h /potato/trunk/
5 Update the README, remove .md extension skordal 3355d 03h /potato/trunk/
4 Add license skordal 3355d 03h /potato/trunk/
3 Fix bug reporting URL skordal 3355d 03h /potato/trunk/
2 Initial commit skordal 3355d 05h /potato/trunk/
1 The project and the structure was created root 3366d 08h /potato/trunk/

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