feat(x86_64/uhyve): drop support for non-FDT TSC frequencies

[mkroening]

This PR

1. tries to read the TSC frequency from the FDT on Uhyve and
2. drops support for non-FDT Uhyve TSC frequencies.

The second commit makes the kernel guess a wrong frequency on pre-hermit-os/uhyve@e4fb46f builds of Uhyve. Uhyve 0.5.0 (Feb 2025) or newer are unaffected.

This PR is a step towards #2546.

[github-actions]

Benchmark Results

Details

Benchmark	Current: dee78ed	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	82.04 s	80.34 s	1.02 ❗
startup_benchmark File Size	0.79 MB	0.80 MB	0.99 ❗
Startup Time - 1 core	0.75 s (±0.02 s)	0.75 s (±0.02 s)	1.01
Startup Time - 2 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.03
Startup Time - 4 cores	0.76 s (±0.02 s)	0.74 s (±0.02 s)	1.02
multithreaded_benchmark Build Time	81.40 s	82.11 s	0.99 ❗
multithreaded_benchmark File Size	0.90 MB	0.86 MB	1.05 ❗
Multithreaded Pi Efficiency - 2 Threads	90.83 % (±8.72 %)	85.89 % (±6.61 %)	1.06
Multithreaded Pi Efficiency - 4 Threads	44.23 % (±3.59 %)	43.43 % (±2.56 %)	1.02
Multithreaded Pi Efficiency - 8 Threads	25.89 % (±1.86 %)	25.76 % (±1.53 %)	1.01
micro_benchmarks Build Time	78.55 s	80.40 s	0.98 ❗
micro_benchmarks File Size	0.90 MB	0.86 MB	1.05 ❗
Scheduling time - 1 thread	64.43 ticks (±2.33 ticks)	62.65 ticks (±4.06 ticks)	1.03
Scheduling time - 2 threads	34.09 ticks (±3.92 ticks)	34.08 ticks (±4.10 ticks)	1.00
Micro - Time for syscall (getpid)	4.00 ticks (±0.59 ticks)	3.45 ticks (±0.58 ticks)	1.16
Memcpy speed - (built_in) block size 4096	82942.34 MByte/s (±57442.13 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	1.01
Memcpy speed - (built_in) block size 1048576	30483.05 MByte/s (±24491.35 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	1.00
Memcpy speed - (built_in) block size 16777216	29308.18 MByte/s (±24063.15 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.11
Memset speed - (built_in) block size 4096	83254.84 MByte/s (±57657.41 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	1.01
Memset speed - (built_in) block size 1048576	31235.93 MByte/s (±24944.83 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	1.00
Memset speed - (built_in) block size 16777216	30095.88 MByte/s (±24529.64 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.11
Memcpy speed - (rust) block size 4096	73966.81 MByte/s (±51683.06 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.00
Memcpy speed - (rust) block size 1048576	30219.19 MByte/s (±24410.81 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	29297.00 MByte/s (±24059.84 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	1.06
Memset speed - (rust) block size 4096	74459.81 MByte/s (±52048.89 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.00
Memset speed - (rust) block size 1048576	30972.29 MByte/s (±24862.29 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	1.00
Memset speed - (rust) block size 16777216	30075.23 MByte/s (±24518.93 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	1.06
alloc_benchmarks Build Time	77.80 s	74.76 s	1.04 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	0.99 ❗
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	4491.22 Ticks (±77.85 Ticks)	5860.58 Ticks (±98.43 Ticks)	0.77 ❗
Allocations - Average Allocation time (no fail)	5309.70 Ticks (±88.80 Ticks)	6554.81 Ticks (±92.86 Ticks)	0.81 ❗
Allocations - Average Deallocation time	1305.57 Ticks (±168.00 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.72 ❗
mutex_benchmark Build Time	78.53 s	79.82 s	0.98 ❗
mutex_benchmark File Size	0.90 MB	0.86 MB	1.05 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.20 ns (±0.57 ns)	12.10 ns (±0.41 ns)	1.01
Mutex Stress Test Average Time per Iteration - 2 Threads	39.52 ns (±2.36 ns)	40.26 ns (±1.68 ns)	0.98

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

[mkroening]

I'll approve this myself, since we don't seem to have any compatibility with pre-0.9.1 versions anyway.