refactor: kernel entry point - add architecture preprocessor checks and move module to Boot

kernel/src/Api/BuildNo.hpp

@@ -12,4 +12,4 @@
 
 #pragma once
 
-#define MONTAUK_BUILD_NUMBER 119
+#define MONTAUK_BUILD_NUMBER 120

kernel/src/Boot/Main.cpp

@@ -1,7 +1,8 @@
 /*
     * main.cpp
     * Kernel entry point
-    * Copyright (c) 2025 Daniel Hammer, Limine Contributors (via Limine C++ example)
+    * Copyright (c) 2025 Daniel Hammer.
+    * Further copyright information and third party notices can be found at https://montaukos.org/license.txt.
 */
 
 #include <cstdint>
@@ -29,7 +30,6 @@
 #include <Drivers/PS2/Keyboard.hpp>
 #include <Drivers/PS2/Mouse.hpp>
 #include <Drivers/Init.hpp>
-#include <Drivers/USB/Bluetooth/Bluetooth.hpp>
 #include <Graphics/Framebuffer.hpp>
 #include <Hal/MSR.hpp>
 #include <Hal/Cpu.hpp>
@@ -63,11 +63,6 @@ extern "C" void kmain() {
         __init_array[i]();
     }
     
-    // Acquire the boot environment through the Montauk Boot Contract.  The
-    // active bootloader adapter (see Boot/Protocols/) translates its native
-    // handoff into this bootloader-agnostic structure.  A false return means
-    // we cannot even bring up a console (unsupported loader, no HHDM, or no
-    // framebuffer) -- there is nothing to do but halt.
     if (!montauk::boot::Initialize()) {
         Hal::Halt();
     }
@@ -119,20 +114,13 @@ extern "C" void kmain() {
     Memory::VMM::g_paging = &g_paging;
     g_paging.Init((uint64_t)&KernelStartSymbol, ((uint64_t)&KernelEndSymbol - (uint64_t)&KernelStartSymbol), boot.memoryMap, framebuffer);
 
-    // Reprogram PAT so entry 1 = Write-Combining (default is Write-Through).
-    // Must be done after paging init and before any WC mappings.
     Hal::InitializePAT();
-    Kt::KernelLogStream(OK, "Hal") << "PAT reprogrammed (entry 1 = WC)";
 
 #endif
 
-    // Initialize the framebuffer early so we can WC-map it before
-    // the bulk of boot logging begins (ACPI, PCI, drivers, etc.)
     Graphics::Framebuffer::Initialize(framebuffer);
 
 #if defined (__x86_64__)
-    // Map framebuffer as Write-Combining immediately for faster screen writes.
-    // All subsequent log output benefits from WC burst transfers.
     Graphics::Framebuffer::MapWriteCombining();
 #endif
 
@@ -145,19 +133,12 @@ extern "C" void kmain() {
 
         Hal::ApicInitialize(g_acpi.GetXSDT());
 
-        // Set up BSP per-CPU data (GS base) before enabling interrupts.
-        // 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");
 
-        // Initialize ACPI events (SCI, power button) after APIC is ready
         Hal::AcpiEvents::Initialize(g_acpi.GetXSDT());
 
         Pci::Initialize(g_acpi.GetXSDT());
@@ -186,29 +167,32 @@ extern "C" void kmain() {
 
     Fs::InitializeBootFilesystems(boot.modules);
 
-
+#if defined (__x86_64__)
     Hal::LoadTSS();
+#endif
+
     montauk::abi::InitializeSyscalls();
 
     Sched::Initialize();
     Ipc::Initialize();
 
-    // Boot Application Processors (all subsystems ready, APs can schedule)
+#if defined (__x86_64__)
     Smp::BootAPs(boot.smp);
+#endif
 
-    // Flush any stale PS/2 mouse bytes that accumulated during boot
-    // (edge-triggered IRQs can be lost while spinlocks disable interrupts)
+#if defined (__x86_64__)
     Drivers::PS2::Mouse::FlushState();
+#endif
 
     Kt::SuppressKernelLog();
     Sched::Spawn("0:/os/init.elf");
 
-    // Enable preemptive scheduling via the APIC timer
     Timekeeping::EnableSchedulerTick();
 
-    // Main loop: idle until next interrupt.
+#if defined (__x86_64__)
     // Use MWAIT for deeper C-states if available, otherwise HLT.
     auto* bspCpu = Smp::GetCpuData(0);
+    
     if (bspCpu && bspCpu->hasMwait) {
         static volatile uint64_t s_bspIdleMonitor = 0;
         for (;;) {
@@ -219,4 +203,9 @@ extern "C" void kmain() {
             Timekeeping::IdleOnce(false);
         }
     }
+#else
+    for (;;) {
+        Timekeeping::IdleOnce(false);
+    }
+#endif
 }