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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 3245d 16h /potato/trunk/benchmarks/
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 3277d 11h /potato/trunk/benchmarks/
24 Remove unused STRINGIFY macros skordal 3294d 08h /potato/trunk/benchmarks/
22 Fix the potato_get_badvaddr() macro skordal 3294d 09h /potato/trunk/benchmarks/
21 Upgrade the example design to use a 60 MHz system clock skordal 3294d 09h /potato/trunk/benchmarks/
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 3294d 09h /potato/trunk/benchmarks/
19 SHA256 benchmark: allow compiler to inline at will skordal 3294d 09h /potato/trunk/benchmarks/
16 Correct grammar in source code comment skordal 3300d 16h /potato/trunk/benchmarks/
15 SHA256 benchmark: fix Makefile syntax error skordal 3307d 09h /potato/trunk/benchmarks/
13 Add SHA256 benchmark code skordal 3307d 14h /potato/trunk/benchmarks/

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