fix: kernel concurrency, interrupt context, and user VA safety

kernel/src/Api/Power.hpp

@@ -14,6 +14,9 @@
 #include <ACPI/AcpiSleep.hpp>
 #include <ACPI/CpuIdle.hpp>
 #include <Hal/CpuPower.hpp>
+#include <Sched/Scheduler.hpp>
+#include <Terminal/Terminal.hpp>
+#include <CppLib/Stream.hpp>
 
 #include "Syscall.hpp"
 
@@ -31,13 +34,21 @@ namespace montauk::abi {
         if (action == POWER_REQ_QUERY) {
             int pending = g_pendingPowerAction;
             g_pendingPowerAction = POWER_REQ_QUERY;
+            Kt::KernelLogStream(Kt::INFO, "Power") << "pid " << kcp::dec
+                << (uint64_t)Sched::GetCurrentPid()
+                << " consumed graceful power request " << (uint64_t)pending;
             return (int64_t)pending;
         }
         g_pendingPowerAction = action;
+        Kt::KernelLogStream(Kt::INFO, "Power") << "pid " << kcp::dec
+            << (uint64_t)Sched::GetCurrentPid()
+            << " posted graceful power request " << (uint64_t)action;
         return 0;
     }
 
     static void Sys_Reset() {
+        Kt::KernelLogStream(Kt::INFO, "Power") << "pid " << kcp::dec
+            << (uint64_t)Sched::GetCurrentPid() << " entered final reboot stage";
         if (Efi::g_ResetSystem) {
             /* Switch to kernel PML4 which has identity-mapped UEFI runtime regions */
             Memory::VMM::LoadCR3(Memory::VMM::g_paging->PML4);
@@ -51,6 +62,8 @@ namespace montauk::abi {
     }
 
     static void Sys_Shutdown() {
+        Kt::KernelLogStream(Kt::INFO, "Power") << "pid " << kcp::dec
+            << (uint64_t)Sched::GetCurrentPid() << " entered final shutdown stage";
         /* Primary: ACPI S5 shutdown via PM1 control registers */
         if (Hal::AcpiShutdown::IsAvailable()) {
             Hal::AcpiShutdown::Shutdown();