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58 Merge branch new-privileged-isa (r48-r57) into trunk

This adds support for the newly published supervisor extensions
version 1.7. In addition, a processor datasheet has been added
and the timer_clk signal has been properly connected in the
example design and the SoC testbench.		 skordal 3286d 16h /potato/trunk/
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 3318d 11h /potato/trunk/
36 Ensure correct read of CSR after stall skordal 3318d 13h /potato/trunk/
35 Prevent jumping/branching when stalling skordal 3318d 13h /potato/trunk/
34 Prevent flushing the pipeline if it is stalling skordal 3318d 13h /potato/trunk/
28 Add rudimentary User's manual skordal 3332d 10h /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 3332d 15h /potato/trunk/
24 Remove unused STRINGIFY macros skordal 3335d 09h /potato/trunk/
22 Fix the potato_get_badvaddr() macro skordal 3335d 09h /potato/trunk/
21 Upgrade the example design to use a 60 MHz system clock skordal 3335d 10h /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 3335d 10h /potato/trunk/
19 SHA256 benchmark: allow compiler to inline at will skordal 3335d 10h /potato/trunk/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3337d 10h /potato/trunk/
17 Improve detection of unaligned instructions skordal 3341d 17h /potato/trunk/
16 Correct grammar in source code comment skordal 3341d 17h /potato/trunk/
15 SHA256 benchmark: fix Makefile syntax error skordal 3348d 10h /potato/trunk/
14 Improve detection of invalid instructions skordal 3348d 10h /potato/trunk/
13 Add SHA256 benchmark code skordal 3348d 15h /potato/trunk/
12 Update example design with correct bug-report URL and testbenches skordal 3348d 17h /potato/trunk/
11 Correct FIFO file header skordal 3348d 17h /potato/trunk/

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