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

kernel/src/Hal/SmpBoot.cpp

@@ -11,6 +11,7 @@
 #include <Hal/IDT.hpp>
 #include <Hal/MSR.hpp>
 #include <Hal/Cpu.hpp>
+#include <Hal/CpuPower.hpp>
 #include <Memory/Paging.hpp>
 #include <Memory/PageFrameAllocator.hpp>
 #include <Memory/HHDM.hpp>
@@ -204,6 +205,9 @@ namespace Smp {
         // --- Check MWAIT support ---
         cpu->hasMwait = Hal::HasMwait();
 
+        // --- Per-CPU power setup (C1E promotion, HWP request) ---
+        Hal::CpuPower::InitializeAp();
+
         // --- Signal that we are online ---
         cpu->started = true;
 
@@ -212,6 +216,8 @@ namespace Smp {
 
         static volatile uint64_t s_idleMonitor = 0;
         for (;;) {
+            // Pick up thermal-governor frequency changes decided by the BSP.
+            Hal::CpuPower::ApplyPolicyIfChanged();
             Hal::CpuIdle::Wait(10, cpu->hasMwait, &s_idleMonitor);
         }
     }