feat: HWP scaling, C1E, closed-loop thermal governor for Intel CPUs

kernel/src/Main.cpp

@@ -33,6 +33,7 @@
 #include <Graphics/Framebuffer.hpp>
 #include <Hal/MSR.hpp>
 #include <Hal/Cpu.hpp>
+#include <Hal/CpuPower.hpp>
 #include <Fs/Boot.hpp>
 #include <Sched/Scheduler.hpp>
 #include <Ipc/Ipc.hpp>
@@ -148,6 +149,11 @@ extern "C" void kmain() {
         // ISR stubs use SWAPGS which requires GS base to point to CpuData.
         Smp::InitBsp();
 
+        // Enable hardware P-state scaling and the thermal governor.
+        // Needs GS base (per-CPU data) set up, and must run before the
+        // APs boot so they inherit the shared policy in ApEntry.
+        Hal::CpuPower::InitializeBsp();
+
         // Now safe to enable interrupts (SWAPGS-aware ISR stubs are installed)
         asm volatile("sti");