feat: add loader feature and make hermit-entry optional

[mkroening]

This PR adds a loader features and makes hermit-entry optional in preparation for #2366.

Depends on:

• fix(x86_64/uefi): unmap stack on drop #2591
• feat(x86_64/uhyve): drop support for non-FDT TSC frequencies #2592
• fix(mm): don't account for kernel executable memory twice #2593
• refactor(aarch64): rename start.s to exceptions.s #2594
• refactor(fs/uhyve): don't import env::fdt() #2595
• refactor(arch): extract hermit-entry-specific start code #2596
• refactor(x86_64/paging): extract UEFI check out of make_p4_writable() #2597
• fix: don't use boot info in SMP start #2602
• fix(x86_64): be UEFI agnostic #2615
• refactor(mm): remove static KERNEL_ADDR_RANGE #2620
• refactor(env): rename items and move start info into module #2621

This is needed for:

• feat(x86_64): add PVH boot support #2366

[github-actions]

Benchmark Results

Details

Benchmark	Current: ed85a9b	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	112.29 s	80.34 s	1.40 ❗
startup_benchmark File Size	0.77 MB	0.80 MB	0.97 ❗
Startup Time - 1 core	0.94 s (±0.03 s)	0.75 s (±0.02 s)	1.27 ❗
Startup Time - 2 cores	0.94 s (±0.03 s)	0.74 s (±0.02 s)	1.28 ❗
Startup Time - 4 cores	0.92 s (±0.06 s)	0.74 s (±0.02 s)	1.24 ❗
multithreaded_benchmark Build Time	107.09 s	82.11 s	1.30 ❗
multithreaded_benchmark File Size	0.86 MB	0.86 MB	1.01 ❗
Multithreaded Pi Efficiency - 2 Threads	89.37 % (±13.51 %)	85.89 % (±6.61 %)	1.04
Multithreaded Pi Efficiency - 4 Threads	44.20 % (±6.59 %)	43.43 % (±2.56 %)	1.02
Multithreaded Pi Efficiency - 8 Threads	25.30 % (±4.56 %)	25.76 % (±1.53 %)	0.98
micro_benchmarks Build Time	109.73 s	80.40 s	1.36 ❗
micro_benchmarks File Size	0.87 MB	0.86 MB	1.01 ❗
Scheduling time - 1 thread	83.84 ticks (±4.60 ticks)	62.65 ticks (±4.06 ticks)	1.34 ❗
Scheduling time - 2 threads	42.96 ticks (±1.62 ticks)	34.08 ticks (±4.10 ticks)	1.26 ❗
Micro - Time for syscall (getpid)	4.28 ticks (±0.35 ticks)	3.45 ticks (±0.58 ticks)	1.24 ❗
Memcpy speed - (built_in) block size 4096	58404.46 MByte/s (±40495.83 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.71
Memcpy speed - (built_in) block size 1048576	29375.99 MByte/s (±23940.92 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.96
Memcpy speed - (built_in) block size 16777216	28712.80 MByte/s (±23762.05 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.09
Memset speed - (built_in) block size 4096	58760.03 MByte/s (±40734.86 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.71
Memset speed - (built_in) block size 1048576	30108.23 MByte/s (±24356.16 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.96
Memset speed - (built_in) block size 16777216	29452.90 MByte/s (±24173.16 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.09
Memcpy speed - (rust) block size 4096	52626.01 MByte/s (±37181.14 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	0.71
Memcpy speed - (rust) block size 1048576	29263.01 MByte/s (±23895.26 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.96
Memcpy speed - (rust) block size 16777216	28989.96 MByte/s (±24020.24 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	1.05
Memset speed - (rust) block size 4096	52905.04 MByte/s (±37361.59 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	0.71
Memset speed - (rust) block size 1048576	30000.80 MByte/s (±24310.49 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.96
Memset speed - (rust) block size 16777216	29724.96 MByte/s (±24421.88 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	1.05
alloc_benchmarks Build Time	103.30 s	74.76 s	1.38 ❗
alloc_benchmarks File Size	0.85 MB	0.87 MB	0.97 ❗
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	5362.85 Ticks (±308.18 Ticks)	5860.58 Ticks (±98.43 Ticks)	0.92 ❗
Allocations - Average Allocation time (no fail)	6046.66 Ticks (±302.56 Ticks)	6554.81 Ticks (±92.86 Ticks)	0.92 ❗
Allocations - Average Deallocation time	1121.06 Ticks (±451.20 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.62 ❗
mutex_benchmark Build Time	107.50 s	79.82 s	1.35 ❗
mutex_benchmark File Size	0.87 MB	0.86 MB	1.01 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	14.82 ns (±0.74 ns)	12.10 ns (±0.41 ns)	1.22 ❗
Mutex Stress Test Average Time per Iteration - 2 Threads	70.76 ns (±5.09 ns)	40.26 ns (±1.68 ns)	1.76 ❗

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