refactor(mmio): deduplicate code and avoid allocation

[cagatay-y]

The third commit (e8a3932) in the series is meant as a demo for if enum_dispatch would work. The answer seems to be "no" as it requires a nightly feature and some trait boilerplate because of the lack of support for associated types in #[enum_dispatch(...)].

[github-actions]

Benchmark Results

Details

Benchmark	Current: 0c4b853	Previous: 7e57c74	Performance Ratio
startup_benchmark Build Time	88.14 s	83.75 s	1.05 ❗
startup_benchmark File Size	0.78 MB	0.78 MB	1.00 ❗
Startup Time - 1 core	0.97 s (±0.03 s)	0.91 s (±0.03 s)	1.06 ❗
Startup Time - 2 cores	0.99 s (±0.04 s)	0.93 s (±0.03 s)	1.07 ❗
Startup Time - 4 cores	0.98 s (±0.04 s)	0.92 s (±0.02 s)	1.06 ❗
multithreaded_benchmark Build Time	91.50 s	87.28 s	1.05 ❗
multithreaded_benchmark File Size	0.89 MB	0.89 MB	1.00 ❗
Multithreaded Pi Efficiency - 2 Threads	89.35 % (±9.52 %)	88.56 % (±8.29 %)	1.01
Multithreaded Pi Efficiency - 4 Threads	44.75 % (±3.81 %)	44.44 % (±3.38 %)	1.01
Multithreaded Pi Efficiency - 8 Threads	25.91 % (±2.63 %)	26.04 % (±1.60 %)	0.99
micro_benchmarks Build Time	94.18 s	94.35 s	1.00 ❗
micro_benchmarks File Size	0.90 MB	0.90 MB	1.00 ❗
Scheduling time - 1 thread	72.51 ticks (±5.50 ticks)	68.56 ticks (±3.95 ticks)	1.06
Scheduling time - 2 threads	40.07 ticks (±4.57 ticks)	36.94 ticks (±3.09 ticks)	1.08
Micro - Time for syscall (getpid)	3.06 ticks (±0.28 ticks)	2.91 ticks (±0.21 ticks)	1.05
Memcpy speed - (built_in) block size 4096	62729.01 MByte/s (±45039.81 MByte/s)	68337.85 MByte/s (±48614.32 MByte/s)	0.92
Memcpy speed - (built_in) block size 1048576	29266.45 MByte/s (±24319.25 MByte/s)	29909.96 MByte/s (±24828.21 MByte/s)	0.98
Memcpy speed - (built_in) block size 16777216	27780.94 MByte/s (±23145.56 MByte/s)	26591.72 MByte/s (±22262.44 MByte/s)	1.04
Memset speed - (built_in) block size 4096	63325.61 MByte/s (±45385.08 MByte/s)	69221.37 MByte/s (±49225.20 MByte/s)	0.91
Memset speed - (built_in) block size 1048576	29990.94 MByte/s (±24739.46 MByte/s)	30694.12 MByte/s (±25269.22 MByte/s)	0.98
Memset speed - (built_in) block size 16777216	28483.10 MByte/s (±23520.34 MByte/s)	27366.57 MByte/s (±22741.66 MByte/s)	1.04
Memcpy speed - (rust) block size 4096	58723.88 MByte/s (±42875.00 MByte/s)	61779.87 MByte/s (±45181.14 MByte/s)	0.95
Memcpy speed - (rust) block size 1048576	29291.29 MByte/s (±24321.21 MByte/s)	30501.92 MByte/s (±25259.37 MByte/s)	0.96
Memcpy speed - (rust) block size 16777216	27598.45 MByte/s (±22976.07 MByte/s)	25762.76 MByte/s (±21564.68 MByte/s)	1.07
Memset speed - (rust) block size 4096	59420.47 MByte/s (±43334.02 MByte/s)	62752.61 MByte/s (±45869.70 MByte/s)	0.95
Memset speed - (rust) block size 1048576	30062.10 MByte/s (±24752.39 MByte/s)	31320.98 MByte/s (±25725.03 MByte/s)	0.96
Memset speed - (rust) block size 16777216	28329.66 MByte/s (±23388.64 MByte/s)	26557.10 MByte/s (±22078.04 MByte/s)	1.07
alloc_benchmarks Build Time	92.38 s	88.56 s	1.04 ❗
alloc_benchmarks File Size	0.85 MB	0.85 MB	1.00 ❗
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	16407.41 Ticks (±287.32 Ticks)	12279.45 Ticks (±256.49 Ticks)	1.34 ❗
Allocations - Average Allocation time (no fail)	16407.41 Ticks (±287.32 Ticks)	12279.45 Ticks (±256.49 Ticks)	1.34 ❗
Allocations - Average Deallocation time	1265.46 Ticks (±1050.65 Ticks)	1161.59 Ticks (±793.94 Ticks)	1.09
mutex_benchmark Build Time	93.51 s	89.77 s	1.04 ❗
mutex_benchmark File Size	0.90 MB	0.90 MB	1.00 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	13.20 ns (±0.82 ns)	12.56 ns (±0.70 ns)	1.05
Mutex Stress Test Average Time per Iteration - 2 Threads	20.30 ns (±13.08 ns)	18.22 ns (±7.43 ns)	1.11

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