Seed entropy using arm rng

[sbutz]

Implement missing entropy seeding on ARM.
ArmRng Implentation
ARM Doc

For RISC-V we could leverage the optional Zkr extension.
RISC-V Doc
Changes follow in separate PR.

[github-actions]

Benchmark Results

Details

Benchmark	Current: 9f0a752	Previous: 496a427	Performance Ratio
startup_benchmark Build Time	81.54 s	80.41 s	1.01 ❗
startup_benchmark File Size	0.80 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.73 s (±0.02 s)	0.73 s (±0.02 s)	1.00
Startup Time - 2 cores	0.74 s (±0.03 s)	0.73 s (±0.02 s)	1.01
Startup Time - 4 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.01
multithreaded_benchmark Build Time	82.38 s	81.45 s	1.01 ❗
multithreaded_benchmark File Size	0.86 MB	0.86 MB	1.00 ❗
Multithreaded Pi Efficiency - 2 Threads	86.06 % (±6.13 %)	89.19 % (±7.29 %)	0.96
Multithreaded Pi Efficiency - 4 Threads	43.62 % (±2.90 %)	43.23 % (±2.22 %)	1.01
Multithreaded Pi Efficiency - 8 Threads	25.31 % (±1.09 %)	25.70 % (±1.35 %)	0.98
micro_benchmarks Build Time	80.50 s	80.50 s	1.00 ❗
micro_benchmarks File Size	0.86 MB	0.86 MB	1.00 ❗
Scheduling time - 1 thread	62.80 ticks (±2.41 ticks)	61.77 ticks (±3.53 ticks)	1.02
Scheduling time - 2 threads	36.69 ticks (±6.19 ticks)	34.80 ticks (±4.41 ticks)	1.05
Micro - Time for syscall (getpid)	3.26 ticks (±0.52 ticks)	3.24 ticks (±0.53 ticks)	1.01
Memcpy speed - (built_in) block size 4096	83131.48 MByte/s (±57643.58 MByte/s)	82518.62 MByte/s (±57031.72 MByte/s)	1.01
Memcpy speed - (built_in) block size 1048576	30811.11 MByte/s (±24881.04 MByte/s)	30748.73 MByte/s (±24797.64 MByte/s)	1.00
Memcpy speed - (built_in) block size 16777216	26551.08 MByte/s (±21961.00 MByte/s)	26790.22 MByte/s (±22121.79 MByte/s)	0.99
Memset speed - (built_in) block size 4096	82937.08 MByte/s (±57507.83 MByte/s)	82944.82 MByte/s (±57257.89 MByte/s)	1.00
Memset speed - (built_in) block size 1048576	31549.46 MByte/s (±25331.06 MByte/s)	31513.05 MByte/s (±25249.82 MByte/s)	1.00
Memset speed - (built_in) block size 16777216	27256.00 MByte/s (±22390.87 MByte/s)	27578.05 MByte/s (±22634.55 MByte/s)	0.99
Memcpy speed - (rust) block size 4096	74555.22 MByte/s (±52060.91 MByte/s)	77062.45 MByte/s (±53546.55 MByte/s)	0.97
Memcpy speed - (rust) block size 1048576	30489.75 MByte/s (±24701.75 MByte/s)	30445.41 MByte/s (±24660.75 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	25407.43 MByte/s (±21008.45 MByte/s)	27553.35 MByte/s (±22787.50 MByte/s)	0.92
Memset speed - (rust) block size 4096	74921.52 MByte/s (±52341.94 MByte/s)	77521.43 MByte/s (±53878.01 MByte/s)	0.97
Memset speed - (rust) block size 1048576	31250.07 MByte/s (±25169.27 MByte/s)	31217.22 MByte/s (±25122.56 MByte/s)	1.00
Memset speed - (rust) block size 16777216	26152.79 MByte/s (±21499.91 MByte/s)	28357.26 MByte/s (±23299.40 MByte/s)	0.92
alloc_benchmarks Build Time	75.15 s	75.20 s	1.00 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
Allocations - Allocation success	91.31 %	91.31 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.44 %	61.44 %	1
Allocations - Average Allocation time	5746.48 Ticks (±216.02 Ticks)	5199.04 Ticks (±177.30 Ticks)	1.11 ❗
Allocations - Average Allocation time (no fail)	6383.51 Ticks (±212.67 Ticks)	5969.39 Ticks (±137.74 Ticks)	1.07 ❗
Allocations - Average Deallocation time	1373.38 Ticks (±384.48 Ticks)	1612.60 Ticks (±268.46 Ticks)	0.85
mutex_benchmark Build Time	80.18 s	76.02 s	1.05 ❗
mutex_benchmark File Size	0.86 MB	0.86 MB	1.00 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.18 ns (±0.52 ns)	11.94 ns (±0.37 ns)	1.02
Mutex Stress Test Average Time per Iteration - 2 Threads	40.32 ns (±2.69 ns)	40.06 ns (±2.30 ns)	1.01

This comment was automatically generated by workflow using github-action-benchmark.

[mkroening]

Thanks, this is great! :)

[mkroening]

I have opened #2544 to enable the CPU feature in CI.