feat(kernel): add hot and cold attributes to optimize function performance

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Kernel/core/interrupts_manager.cpp

@@ -264,7 +264,7 @@ namespace Interrupts
 		warn("IRQ%d not found.", InterruptNumber);
 	}
 
-	nsa inline void ReturnFromInterrupt()
+	nsa hot inline void ReturnFromInterrupt()
 	{
 #if defined(__amd64__) || defined(__i386__)
 		CPUData *CoreData = GetCurrentCPU();
@@ -309,7 +309,7 @@ namespace Interrupts
 		CPU::Stop();
 	}
 
-	extern "C" nsa void MainInterruptHandler(void *Data)
+	extern "C" nsa hot void MainInterruptHandler(void *Data)
 	{
 		class AutoSwitchPageTable
 		{
@@ -384,7 +384,7 @@ namespace Interrupts
 #endif
 	}
 
-	extern "C" nsa void SchedulerInterruptHandler(void *Data)
+	extern "C" nsa hot void SchedulerInterruptHandler(void *Data)
 	{
 #if defined(__amd64__) || defined(__i386__)
 		KernelPageTable->Update();

Kernel/include/types.h

@@ -458,6 +458,9 @@ typedef uint48_t uint_fast48_t;
 #define likely(x) __builtin_expect(!!(x), 1)
 #define unlikely(x) __builtin_expect(!!(x), 0)
 
+#define hot __attribute__((hot))
+#define cold __attribute__((cold))
+
 #define NoSecurityAnalysis __no_stack_protector __no_sanitize_address __no_sanitize_undefined __no_sanitize_thread
 #define nsa NoSecurityAnalysis
 

Kernel/kernel.cpp

@@ -117,7 +117,7 @@ EXTERNC void KPrint(const char *Format, ...)
 #endif
 }
 
-EXTERNC NIF void Main()
+EXTERNC NIF cold void Main()
 {
 	Display = new Video::Display(bInfo.Framebuffer[0]);
 	KernelConsole::EarlyInit();
@@ -265,7 +265,7 @@ typedef void (*CallPtr)(void);
 extern CallPtr __init_array_start[0], __init_array_end[0];
 extern CallPtr __fini_array_start[0], __fini_array_end[0];
 
-EXTERNC __no_stack_protector NIF void Entry(BootInfo *Info)
+EXTERNC __no_stack_protector NIF cold void Entry(BootInfo *Info)
 {
 	trace("Hello, World!");
 

Kernel/kernel_thread.cpp

@@ -31,7 +31,7 @@
 #include <vm.hpp>
 #include <vector>
 
-int SpawnInit()
+cold int SpawnInit()
 {
 	const char *envp[6] = {
 		"PATH=/bin:/usr/bin",
@@ -54,7 +54,7 @@ int SpawnInit()
 						  nullptr, false, compat, true);
 }
 
-void KernelMainThread()
+cold void KernelMainThread()
 {
 	thisThread->SetPriority(Tasking::Critical);
 
@@ -129,7 +129,7 @@ Exit:
 }
 
 NewLock(ShutdownLock);
-void __no_stack_protector KernelShutdownThread(bool Reboot)
+cold void __no_stack_protector KernelShutdownThread(bool Reboot)
 {
 	SmartLock(ShutdownLock);
 	debug("KernelShutdownThread(%s)", Reboot ? "true" : "false");

Kernel/tasking/scheduler/custom.cpp

@@ -234,7 +234,7 @@ namespace Tasking::Scheduler
 #endif
 	}
 
-	void Custom::Yield()
+	hot void Custom::Yield()
 	{
 		/* This will trigger the IRQ16
 		instantly so we won't execute
@@ -272,7 +272,7 @@ namespace Tasking::Scheduler
 
 	/* --------------------------------------------------------------- */
 
-	nsa void Custom::OneShot(int TimeSlice)
+	hot nsa void Custom::OneShot(int TimeSlice)
 	{
 		if (TimeSlice == 0)
 			TimeSlice = Tasking::TaskPriority::Normal;
@@ -288,7 +288,7 @@ namespace Tasking::Scheduler
 #endif
 	}
 
-	nsa void Custom::UpdateUsage(TaskInfo *Info, TaskExecutionMode Mode, int Core)
+	hot nsa void Custom::UpdateUsage(TaskInfo *Info, TaskExecutionMode Mode, int Core)
 	{
 		UNUSED(Core);
 		uint64_t CurrentTime = TimeManager->GetCounter();
@@ -301,7 +301,7 @@ namespace Tasking::Scheduler
 			Info->KernelTime += TimePassed;
 	}
 
-	nsa NIF bool Custom::FindNewProcess(void *CPUDataPointer)
+	hot nsa NIF bool Custom::FindNewProcess(void *CPUDataPointer)
 	{
 		CPUData *CurrentCPU = (CPUData *)CPUDataPointer;
 		fnp_schedbg("%d processes", ProcessList.size());
@@ -348,7 +348,7 @@ namespace Tasking::Scheduler
 		return false;
 	}
 
-	nsa NIF bool Custom::GetNextAvailableThread(void *CPUDataPointer)
+	hot nsa NIF bool Custom::GetNextAvailableThread(void *CPUDataPointer)
 	{
 		CPUData *CurrentCPU = (CPUData *)CPUDataPointer;
 
@@ -397,7 +397,7 @@ namespace Tasking::Scheduler
 		return false;
 	}
 
-	nsa NIF bool Custom::GetNextAvailableProcess(void *CPUDataPointer)
+	hot nsa NIF bool Custom::GetNextAvailableProcess(void *CPUDataPointer)
 	{
 		CPUData *CurrentCPU = (CPUData *)CPUDataPointer;
 
@@ -445,7 +445,7 @@ namespace Tasking::Scheduler
 		return false;
 	}
 
-	nsa NIF bool Custom::SchedulerSearchProcessThread(void *CPUDataPointer)
+	hot nsa NIF bool Custom::SchedulerSearchProcessThread(void *CPUDataPointer)
 	{
 		CPUData *CurrentCPU = (CPUData *)CPUDataPointer;
 
@@ -564,7 +564,7 @@ namespace Tasking::Scheduler
 		}
 	}
 
-	nsa NIF void Custom::Schedule(CPU::SchedulerFrame *Frame)
+	hot nsa NIF void Custom::Schedule(CPU::SchedulerFrame *Frame)
 	{
 		if (unlikely(StopScheduler))
 		{
@@ -721,7 +721,7 @@ namespace Tasking::Scheduler
 		this->SchedulerTicks.store(size_t(TimeManager->GetCounter() - SchedTmpTicks));
 	}
 
-	nsa NIF void Custom::OnInterruptReceived(CPU::SchedulerFrame *Frame)
+	hot nsa NIF void Custom::OnInterruptReceived(CPU::SchedulerFrame *Frame)
 	{
 		SmartCriticalSection(SchedulerLock);
 		this->Schedule(Frame);