feat(riscv64) Support multiple mmio devices

[sbutz]

While there remove unsafe code to a minimum.

Will conflict with #2547.

[github-actions]

Benchmark Results

Details

Benchmark	Current: ba7ce02	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	234.96 s	80.34 s	2.92 ❗
startup_benchmark File Size	0.78 MB	0.80 MB	0.98 ❗
Startup Time - 1 core	2.31 s (±0.23 s)	0.75 s (±0.02 s)	3.10 ❗
Startup Time - 2 cores	2.30 s (±0.23 s)	0.74 s (±0.02 s)	3.13 ❗
Startup Time - 4 cores	2.40 s (±0.24 s)	0.74 s (±0.02 s)	3.23 ❗
multithreaded_benchmark Build Time	231.34 s	82.11 s	2.82 ❗
multithreaded_benchmark File Size	0.88 MB	0.86 MB	1.03 ❗
Multithreaded Pi Efficiency - 2 Threads	85.35 % (±16.35 %)	85.89 % (±6.61 %)	0.99
Multithreaded Pi Efficiency - 4 Threads	56.86 % (±10.08 %)	43.43 % (±2.56 %)	1.31 ❗
Multithreaded Pi Efficiency - 8 Threads	34.63 % (±7.08 %)	25.76 % (±1.53 %)	1.34 ❗
micro_benchmarks Build Time	205.66 s	80.40 s	2.56 ❗
micro_benchmarks File Size	0.89 MB	0.86 MB	1.03 ❗
Scheduling time - 1 thread	190.06 ticks (±32.12 ticks)	62.65 ticks (±4.06 ticks)	3.03 ❗
Scheduling time - 2 threads	111.46 ticks (±18.76 ticks)	34.08 ticks (±4.10 ticks)	3.27 ❗
Micro - Time for syscall (getpid)	10.74 ticks (±4.90 ticks)	3.45 ticks (±0.58 ticks)	3.11 ❗
Memcpy speed - (built_in) block size 4096	52255.95 MByte/s (±38331.14 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.63
Memcpy speed - (built_in) block size 1048576	14827.05 MByte/s (±12849.41 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.48
Memcpy speed - (built_in) block size 16777216	13440.09 MByte/s (±11220.85 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	0.51
Memset speed - (built_in) block size 4096	52815.73 MByte/s (±38705.87 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.64
Memset speed - (built_in) block size 1048576	15203.88 MByte/s (±13042.65 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.49
Memset speed - (built_in) block size 16777216	13747.19 MByte/s (±11379.10 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	0.51
Memcpy speed - (rust) block size 4096	51337.88 MByte/s (±36849.33 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	0.69
Memcpy speed - (rust) block size 1048576	14793.19 MByte/s (±12483.51 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.49
Memcpy speed - (rust) block size 16777216	13751.75 MByte/s (±11451.53 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.50
Memset speed - (rust) block size 4096	51624.87 MByte/s (±37043.25 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	0.69
Memset speed - (rust) block size 1048576	15176.92 MByte/s (±12691.75 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.49
Memset speed - (rust) block size 16777216	14156.01 MByte/s (±11705.93 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.50
alloc_benchmarks Build Time	199.03 s	74.76 s	2.66 ❗
alloc_benchmarks File Size	0.86 MB	0.87 MB	0.98 ❗
Allocations - Allocation success	91.35 %	91.31 %	1.00 ❗
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.55 %	61.44 %	1.00 ❗
Allocations - Average Allocation time	16418.61 Ticks (±1048.06 Ticks)	5860.58 Ticks (±98.43 Ticks)	2.80 ❗
Allocations - Average Allocation time (no fail)	17149.19 Ticks (±1404.10 Ticks)	6554.81 Ticks (±92.86 Ticks)	2.62 ❗
Allocations - Average Deallocation time	3634.59 Ticks (±1153.39 Ticks)	1805.01 Ticks (±250.35 Ticks)	2.01 ❗
mutex_benchmark Build Time	198.78 s	79.82 s	2.49 ❗
mutex_benchmark File Size	0.89 MB	0.86 MB	1.03 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	32.26 ns (±5.15 ns)	12.10 ns (±0.41 ns)	2.67 ❗
Mutex Stress Test Average Time per Iteration - 2 Threads	30.58 ns (±6.68 ns)	40.26 ns (±1.68 ns)	0.76 ❗

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