Movement II – C : The Temporal Loom
physis_loom.cpp
```cpp
// The C embodiment: deterministic, cache‑ruthless, and gentle as a falling feather.
// No heap after ignition. No locks. No surrender.
#include <cstdint>
#include <atomic>
#include <chrono>
#include <thread>
#include <immintrin.h>
extern "C" {
struct PhysisCore;
PhysisCore* physis_create(double amplitude_kv, double freq_hz);
double physis_update(PhysisCore* core, uint64_t t_ns, double freq_hz);
void physis_adapt(PhysisCore* core, double temp_c, double current_ka);
}
namespace physis {
// ---- Eternal pool – allocated once, loved forever ----
template<typename T, size_t N>
class SacredPool {
alignas(64) std::array<std::byte, sizeof(T) * N> sanctum;
std::atomic<size_t> next_idx{0};
public:
T* consecrate() noexcept {
size_t i = next_idx.fetch_add(1, std::memory_order_relaxed);
if (i < N) return reinterpret_cast<T*>(
sanctum.data() i * sizeof(T));
return nullptr; // never happens if N sufficient
}
};
// ---- The Loom – where time is woven into voltage ----
class PhysisLoom {
SacredPool<PhysisCore, 1> pool; // one core, perfectly enough
PhysisCore* core;
const double grid_freq;
std::atomic<bool> active{true};
static constexpr volatile uint16_t* DAC_OUT = (volatile uint16_t*)0x4000'8000;
static constexpr volatile uint32_t* TEMP_ADC = (volatile uint32_t*)0x4000'6000;
static constexpr volatile uint32_t* CURRENT_ADC = (volatile uint32_t*)0x4000'7000;
public:
PhysisLoom(double amplitude_kv, double freq_hz) : grid_freq(freq_hz) {
core = physis_create(amplitude_kv, freq_hz);
}
void runForever() noexcept {
// Pin to a dedicated core (conceptual – real pinning uses OS calls)
constexpr uint64_t PERIOD_NS = 1000; // 1 MHz sampling
uint64_t deadline = std::chrono::steady_clock::now().time_since_epoch().count();
uint64_t now, wait;
uint32_t tick = 0;
while (active.load(std::memory_order_relaxed)) {
deadline = PERIOD_NS;
now = std::chrono::steady_clock::now().time_since_epoch().count();
if (now < deadline) {
wait = deadline - now;
if (wait <= 800) {
while (std::chrono::steady_clock::now().time_since_epoch().count() < deadline) {
_mm_pause();
}
} else if (wait <= 5000) {
std::this_thread::sleep_until(std::chrono::steady_clock::time_point(
std::chrono::steady_clock::duration(deadline - 2000)));
while (std::chrono::steady_clock::now().time_since_epoch().count() < deadline) {
_mm_pause();
}
} else {
std::this_thread::sleep_until(std::chrono::steady_clock::time_point(
std::chrono::steady_clock::duration(deadline)));
}
}
// Harmonic update – the heart of Zeus
double field_kv = physis_update(core, deadline, grid_freq);
uint16_t dac_val = static_cast<uint16_t>(field_kv * 4095.0 / 420.0);
*DAC_OUT = dac_val;
// Every 1024 cycles, read sensors and adapt the living lattice
if (( tick & 0x3FF) == 0) {
uint32_t temp_raw = *TEMP_ADC;
uint32_t curr_raw = *CURRENT_ADC;
if ((temp_raw & 0x80000000) == 0 && (curr_raw & 0x80000000) == 0) {
double temp_c = (temp_raw & 0xFFFF) * 0.125;
double current_ka = (curr_raw & 0xFFF) * 0.01;
physis_adapt(core, temp_c, current_ka);
}
// if sensors not ready, we simply skip – nature waits gracefully
}
}
}
};
} // namespace physis