feat(core): implement spinlocks, GC and keyboard safety

* Implemented Spinlocks and applied to VM/Scheduler

* Added Garbage Collector for tasks

* Moved Getchar to IOKeyboard with locking

* Cleanup panic messages

kernel/inc/IO/IOConsole.h

@@ -29,7 +29,6 @@ IOGraphicsSize IOConsoleGetDimensions();
 void IOConsoleSetForegroundColor(IOGraphicsColor color);
 void IOConsoleSetDefaultForegroundColor(UInt32 color);
 void IOConsoleSetCursorPosition(IOGraphicsPoint* point);
-char IOConsoleGetCharacter();
 void IOConsoleReadLine(char* buffer, UInt32 limit);
 void IOConsolePutcharacter(char character);
 void IOConsolePrint(const char *string);

kernel/inc/IO/IOKeyboard.h

@@ -3,17 +3,20 @@
 
 #pragma once
 #include <types.h>
+#include <OS/OSSpinlock.h>
 
 enum {
     kIOKeyboardBufferSize = 256,
 };
 
 typedef struct { 
+    OSSpinlock lock;
     char buffer[kIOKeyboardBufferSize];
-    UInt16 head;
-    UInt16 tail;
-} IOKeyboardBuffer;
+    volatile UInt16 head;
+    volatile UInt16 tail;
+} IOKeyboardController;
 
-extern IOKeyboardBuffer gIOKeyboardInputBuffer;
+extern IOKeyboardController gIOKeyboardController;
 
 void IOKeyboardInterruptsHandler();
+char IOKeyboardGetCharacter();

kernel/inc/OS/OSScheduler.h

@@ -29,6 +29,7 @@ typedef struct OSTask {
     UInt32 sleepTicks;
     OSProcessState taskState; // reusing process_state cuz wn
     UInt64 kernelStackTop;
+    void* kernelStackBase;
     OSProcess* process;
     Int32 waitingForProcess;
 } OSTask;

kernel/inc/OS/OSSpinlock.h

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#pragma once
+
+#include <types.h>
+
+typedef struct OSSpinlock {
+    volatile UInt32 lockValue;
+} OSSpinlock;
+
+typedef struct OSSpinlockState {
+    Boolean interruptsEnabled;
+} OSSpinlockState;
+
+void OSSpinlockLock(OSSpinlock* lock);
+void OSSpinlockUnlock(OSSpinlock* lock);
+void OSSpinlockLockIRQ(OSSpinlock* lock, OSSpinlockState* state);
+void OSSpinlockUnlockIRQ(OSSpinlock *lock, OSSpinlockState* state);

kernel/src/IO/IOConsole.c

@@ -238,19 +238,10 @@ void IOConsoleSetDefaultForegroundColor(UInt32 color) {
     sIOConsoleDefaultForegroundColor = color;
 }
 
-char IOConsoleGetCharacter() {
-    while (gIOKeyboardInputBuffer.head == gIOKeyboardInputBuffer.tail) { __asm__ volatile ("sti"); OSSchedulerYield(1); }
-    __asm__ volatile ("cli");
-    char temp = gIOKeyboardInputBuffer.buffer[gIOKeyboardInputBuffer.tail];
-    gIOKeyboardInputBuffer.tail = (gIOKeyboardInputBuffer.tail + 1) % kIOKeyboardBufferSize;
-    __asm__ volatile ("sti");
-    return temp;
-}
-
 void IOConsoleReadLine(char* buffer, UInt32 limit) {
     UInt32 i = 0;
     while (true) {
-        char character = IOConsoleGetCharacter();
+        char character = IOKeyboardGetCharacter();
         switch (character) {
             case '\n': { 
                 buffer[i] = '\0';

kernel/src/IO/IOKeyboard.c

@@ -3,6 +3,8 @@
 
 #include <IO/IOKeyboard.h>
 #include <IO/IOConsole.h>
+#include <OS/OSSpinlock.h>
+#include <OS/OSScheduler.h>
 
 #include <IO.h>
 #include <types.h>
@@ -87,19 +89,20 @@ static unsigned char sIOKeyboardMapShifted[128] = {
 
 static Boolean sIOKeyboardIsShiftPressed = false;
 
-IOKeyboardBuffer gIOKeyboardInputBuffer = {0};
+IOKeyboardController gIOKeyboardController = {0};
 
 void IOKeyboardInterruptsHandler() {
-    UInt16 nextHead = (gIOKeyboardInputBuffer.head + 1) % kIOKeyboardBufferSize;
+    OSSpinlockLock(&gIOKeyboardController.lock);
+    UInt16 nextHead = (gIOKeyboardController.head + 1) % kIOKeyboardBufferSize;
 
     UInt8 scancode = IOPortRead8(0x60);
     // make code 0x00 - 0x7F; break code = make code + 0x80
     if (scancode < 0x80) {
         unsigned char* keyMap = sIOKeyboardIsShiftPressed ? sIOKeyboardMapShifted : sIOKeyboardMap;
         char ascii = keyMap[scancode];
-        if (ascii && nextHead != gIOKeyboardInputBuffer.tail) {
-            gIOKeyboardInputBuffer.buffer[gIOKeyboardInputBuffer.head] = ascii;
-            gIOKeyboardInputBuffer.head = nextHead;
+        if (ascii && nextHead != gIOKeyboardController.tail) {
+            gIOKeyboardController.buffer[gIOKeyboardController.head] = ascii;
+            gIOKeyboardController.head = nextHead;
         } else {
             switch (scancode) {
                 case 0x2A: sIOKeyboardIsShiftPressed = true; break;
@@ -112,4 +115,27 @@ void IOKeyboardInterruptsHandler() {
             default: break;
         }
     }
+
+    OSSpinlockUnlock(&gIOKeyboardController.lock);
+}
+
+char IOKeyboardGetCharacter() {
+    char ascii = 0;
+    OSSpinlockState state;
+
+    while (true) {
+        OSSpinlockLockIRQ(&gIOKeyboardController.lock, &state);
+        
+        if (gIOKeyboardController.head != gIOKeyboardController.tail) {
+            ascii = gIOKeyboardController.buffer[gIOKeyboardController.tail];
+            gIOKeyboardController.tail = (gIOKeyboardController.tail + 1) % kIOKeyboardBufferSize;
+            
+            OSSpinlockUnlockIRQ(&gIOKeyboardController.lock, &state);
+            return ascii;
+        }
+        
+        OSSpinlockUnlockIRQ(&gIOKeyboardController.lock, &state);
+        __asm__ volatile ("sti");
+        OSSchedulerYield(1);
+    }
 }

kernel/src/OS/OSPanic.c

@@ -35,8 +35,6 @@ static const char* sOSPanicFunMessages[] = {
     "I'll be back",
     "Hastla la vista, baby",
     "Ti chego mne tut nagovoril...",
-    "Your access has been denied because of your region.\n\t\t\t\tPlease, use Chultem VPN and try again later.",
-    "Fatal error has been occurred. \n\t\t\t\tYour device will be transformed into Niva in a few seconds.",
     "Have you tried turning it off and on again?",
     "Put it in rice maybe?",
     "Just hit the monitor, it usually helps",

kernel/src/OS/OSScheduler.c

@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 // Copyright (c) 2026 0xKarinyash
 
-#include <OS/OSPanic.h>
 #include <OS/OSScheduler.h>
+#include <OS/OSSpinlock.h>
+#include <OS/OSPanic.h>
 #include <lib/String.h>
 #include <VM/Heap.h>
 #include <VM/VMM.h>
@@ -16,6 +17,7 @@ extern void irq0_handler();
 extern UInt64 gVMKernelPML4Physical;
 
 static OSProcess sOSSchedulerKernelProcess;
+static OSSpinlock sOSSchedulerLock;
 
 void idle_task() {
     while (1) {
@@ -23,6 +25,39 @@ void idle_task() {
     }
 }
 
+
+void OSSchedulerGarbadgeCollector() {
+    OSTask* self = gOSSchedulerCurrentTask;
+
+    while (true) {
+        OSTask* previousTask = self;
+        OSTask* nextTask = previousTask->next;
+
+        while (nextTask != self) {
+            if (nextTask->taskState == kOSProcessStateDead) {
+                OSSpinlockState lockState;
+                OSSpinlockLockIRQ(&sOSSchedulerLock, &lockState);
+                
+                previousTask->next = nextTask->next;
+                
+                OSSpinlockUnlockIRQ(&sOSSchedulerLock, &lockState);
+
+                if (nextTask->kernelStackBase) {
+                    VMHeapFree(nextTask->kernelStackBase);
+                }
+                VMHeapFree(nextTask);
+
+                nextTask = previousTask->next;
+            } else {
+                previousTask = nextTask;
+                nextTask = nextTask->next;
+            }
+        }
+
+        OSSchedulerYield(200);
+    }
+}
+
 void OSSchedulerInitialize() {
     sOSSchedulerKernelProcess.processId = 0;
     sOSSchedulerKernelProcess.state = kOSProcessStateRunning;
@@ -30,7 +65,10 @@ void OSSchedulerInitialize() {
     strcpy(sOSSchedulerKernelProcess.name, "kernel");
 
     OSTask* kernelTask = (OSTask*)VMHeapAllocate(sizeof(OSTask));
+    if (!kernelTask) OSPanic("Failed to initialize scheduler: OOm");
+
     memset(kernelTask, 0, sizeof(OSTask));
+
     kernelTask->id = 0;
     kernelTask->process = &sOSSchedulerKernelProcess;
     kernelTask->sleepTicks = 0;
@@ -40,6 +78,8 @@ void OSSchedulerInitialize() {
 
     gOSSchedulerCurrentTask = kernelTask;
     OSSchedulerSpawn(idle_task, &sOSSchedulerKernelProcess, false, 0);
+    OSSchedulerSpawn(OSSchedulerGarbadgeCollector, &sOSSchedulerKernelProcess, false, 0);
+    return;
 }
 
 OSTask* OSSchedulerSpawn(void(*entry)(), OSProcess* owner, Boolean isUser, UInt64 fixedUserStackPointer) {
@@ -74,17 +114,27 @@ OSTask* OSSchedulerSpawn(void(*entry)(), OSProcess* owner, Boolean isUser, UInt6
     task->process = owner;
     task->id = owner->processId;
     task->sleepTicks = 0;
-    task->next = gOSSchedulerCurrentTask->next;
     task->kernelStackTop = (UInt64)stackBaseAddress + stackSize;
+    task->kernelStackBase = stackBaseAddress;
     task->taskState = kOSProcessStateRunning;
     task->waitingForProcess = -1;
+
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sOSSchedulerLock, &state);
+
+    task->next = gOSSchedulerCurrentTask->next;
     gOSSchedulerCurrentTask->next = task;
+
+    OSSpinlockUnlockIRQ(&sOSSchedulerLock, &state);
+
     return task;
 }
 
 UInt64 OSSchedulerNext(UInt64 currentStackPointer) {
     if (!gOSSchedulerCurrentTask) return currentStackPointer;
 
+    OSSpinlockLock(&sOSSchedulerLock);
+
     gOSSchedulerCurrentTask->stackPointer = currentStackPointer;
     OSTask* taskIterator = gOSSchedulerCurrentTask->next;
 
@@ -95,12 +145,12 @@ UInt64 OSSchedulerNext(UInt64 currentStackPointer) {
 
     if (gOSSchedulerCurrentTask->sleepTicks > 0) gOSSchedulerCurrentTask->sleepTicks--;
 
-    OSTask* nextTask = gOSSchedulerCurrentTask;
+    OSTask* nextTask = gOSSchedulerCurrentTask->next;
     while (1) {
-        // TODO: add gc here;
-        nextTask = nextTask->next;
         if (nextTask->taskState == kOSProcessStateSleeping && nextTask->sleepTicks == 0) nextTask->taskState = kOSProcessStateRunning;
         if (nextTask->taskState == kOSProcessStateRunning) break;
+        nextTask = nextTask->next;
+
         if (nextTask == gOSSchedulerCurrentTask) {
             if (gOSSchedulerCurrentTask->taskState == kOSProcessStateRunning) break;
             OSPanic("no running tasks");
@@ -111,6 +161,8 @@ UInt64 OSSchedulerNext(UInt64 currentStackPointer) {
     gOSSchedulerCurrentTask = nextTask;
     gHALTaskStateSegment.rsp0 = gOSSchedulerCurrentTask->kernelStackTop;
     gOSBootCPU.kernelStackPointer = gOSSchedulerCurrentTask->kernelStackTop;
+
+    OSSpinlockUnlock(&sOSSchedulerLock);
     return gOSSchedulerCurrentTask->stackPointer;
 }
 
@@ -121,6 +173,9 @@ void OSSchedulerBlock(UInt32 processID) {
 }
 
 void OSSchedulerWakeup(UInt32 processID) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sOSSchedulerLock, &state);
+
     OSTask* iteratorTask = gOSSchedulerCurrentTask;
     do {
         if (iteratorTask->taskState == kOSProcessStateBlocked && iteratorTask->waitingForProcess == (Int32)processID) {
@@ -129,6 +184,8 @@ void OSSchedulerWakeup(UInt32 processID) {
         }
         iteratorTask = iteratorTask->next;
     } while (iteratorTask != gOSSchedulerCurrentTask);
+
+    OSSpinlockUnlockIRQ(&sOSSchedulerLock, &state);
 }
 
 void OSSchedulerTerminate() {
@@ -143,4 +200,4 @@ void OSSchedulerYield(UInt64 ticks) {
     gOSSchedulerCurrentTask->sleepTicks = ticks;
     gOSSchedulerCurrentTask->taskState = kOSProcessStateSleeping;
     __asm__ volatile("hlt");
-}
+}

kernel/src/OS/OSSpinlock.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#include <OS/OSSpinlock.h>
+
+void OSSpinlockLock(OSSpinlock* lock) {
+    while (__atomic_exchange_n(&lock->lockValue, 1, __ATOMIC_ACQUIRE)) {
+        while (lock->lockValue) {
+            __builtin_ia32_pause();
+        }
+    }
+}
+
+void OSSpinlockUnlock(OSSpinlock *lock) {
+    __atomic_store_n(&lock->lockValue, 0, __ATOMIC_RELEASE);
+}
+
+void OSSpinlockLockIRQ(OSSpinlock *lock, OSSpinlockState *state) {
+    UInt64 rflags;
+    __asm__ volatile("pushfq; pop %0; cli" : "=r"(rflags) :: "memory"); // read flags and cli
+    state->interruptsEnabled = (rflags & (1 << 9)) != 0; // IF bit
+    
+    OSSpinlockLock(lock);
+}
+
+void OSSpinlockUnlockIRQ(OSSpinlock *lock, OSSpinlockState *state) {
+    OSSpinlockUnlock(lock);
+    if (state->interruptsEnabled) __asm__ volatile("sti" ::: "memory");
+}

kernel/src/OS/Services/OSServiceIO.c

@@ -3,6 +3,7 @@
 
 #include <OS/Services/OSServiceIO.h>
 #include <IO/IOConsole.h>
+#include <IO/IOKeyboard.h>
 
 UInt64 OSServiceWrite(UInt64 fileDescriptor, UInt64 buffer, UInt64 length) {
     if (fileDescriptor == 1 || fileDescriptor == 2) {
@@ -19,7 +20,7 @@ UInt64 OSServiceRead(UInt64 fileDescriptor, UInt64 buffer, UInt64 count) {
     char* readBuffer = (char*)buffer;
     if (fileDescriptor == 0) {
         for (UInt64 i = 0; i < count; i++) {
-            readBuffer[i] = IOConsoleGetCharacter();
+            readBuffer[i] = IOKeyboardGetCharacter();
         }
         return count;
     }

kernel/src/VM/Heap.c

@@ -6,10 +6,12 @@
 #include <VM/VMM.h>
 #include <lib/String.h>
 #include <OS/OSPanic.h>
+#include <OS/OSSpinlock.h>
 #include <types.h>
 
 extern UInt64* gVMKernelPML4;
 static VMHeapBlockHeader* sVMHeapListHead = nullptr;
+static OSSpinlock sVMHeapLock = {0};
 
 static void sVMHeapCombineForward(VMHeapBlockHeader* current) {
     if (!current->next || !current->next->isFree) return;
@@ -37,7 +39,7 @@ void VMHeapInitialize() {
     sVMHeapListHead->previous = nullptr;
 }
 
-void* VMHeapAllocate(UInt64 size) {
+static void* sVMHeapAllocateInternal(UInt64 size) {
     if (size == 0) return nullptr;
     UInt64 alignedSize = (size + 15) & ~15;
 
@@ -65,7 +67,7 @@ void* VMHeapAllocate(UInt64 size) {
     return nullptr;
 }
 
-void VMHeapFree(void* pointer) {
+static void sVMHeapFreeInternal(void* pointer) {
     if (!pointer) return;
 
     VMHeapBlockHeader* current = (VMHeapBlockHeader*)((UInt64)pointer - sizeof(VMHeapBlockHeader));
@@ -76,6 +78,25 @@ void VMHeapFree(void* pointer) {
     if (current->previous && current->previous->isFree) sVMHeapCombineForward(current->previous);
 }
 
+void* VMHeapAllocate(UInt64 size) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMHeapLock, &state);
+    
+    void* result = sVMHeapAllocateInternal(size);
+    
+    OSSpinlockUnlockIRQ(&sVMHeapLock, &state);
+    return result;
+}
+
+void VMHeapFree(void* pointer) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMHeapLock, &state);
+    
+    sVMHeapFreeInternal(pointer);
+    
+    OSSpinlockUnlockIRQ(&sVMHeapLock, &state);
+}
+
 void* VMHeapResize(void* pointer, UInt64 newSize) {
     if (!pointer) return VMHeapAllocate(newSize);
     if (newSize == 0) { 
@@ -83,21 +104,28 @@ void* VMHeapResize(void* pointer, UInt64 newSize) {
         return nullptr; 
     }
 
-    VMHeapBlockHeader* current = (VMHeapBlockHeader*)((UInt64)pointer - sizeof(VMHeapBlockHeader));
-    if (current->size >= newSize) return pointer;
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMHeapLock, &state);
 
-    if (current->next &&
-        current->next->isFree &&
+    VMHeapBlockHeader* current = (VMHeapBlockHeader*)((UInt64)pointer - sizeof(VMHeapBlockHeader));
+    if (current->size >= newSize) { 
+        OSSpinlockUnlockIRQ(&sVMHeapLock, &state);
+        return pointer;
+    }
+
+    if (current->next && current->next->isFree &&
         (current->size + sizeof(VMHeapBlockHeader) + current->next->size) >= newSize) { // why ts so fucking unreadable
             sVMHeapCombineForward(current);
+            OSSpinlockUnlockIRQ(&sVMHeapLock, &state);
             return pointer;
     }
 
-    void* newPointer = VMHeapAllocate(newSize);
-    if (!newPointer) return nullptr;
-
-    memcpy(newPointer, pointer, current->size);
-    VMHeapFree(pointer);
+    void* newPointer = sVMHeapAllocateInternal(newSize);
+    if (newPointer) {
+        memcpy(newPointer, pointer, current->size);
+        sVMHeapFreeInternal(pointer);
+    }
 
+    OSSpinlockUnlockIRQ(&sVMHeapLock, &state);
     return newPointer;
 }

kernel/src/VM/PMM.c

@@ -6,7 +6,9 @@
 #include <lib/String.h>
 #include <lib/Math.h>
 
-#include <OS/OSPanic.h> 
+#include <OS/OSPanic.h>
+#include <OS/OSSpinlock.h>
+
 #include <types.h>
 
 #include "bootinfo.h"
@@ -16,6 +18,8 @@ UInt8*  gVMPhycalMemoryBitmap = nullptr;
 UInt64  gVMPhycalMemoryBitmapSize = 0;
 UInt64  gVMPhycalMemoryTotalMemorySize = 0;
 
+static OSSpinlock sVMPMMLock = {0};
+
 extern UInt64 _kernel_start; 
 extern UInt64 _kernel_end;
 
@@ -96,6 +100,9 @@ void VMPhysicalMemoryInitialize(BIMemoryMap *memoryMap) {
 }
 
 void* VMPhysicalMemoryAllocatePage() {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMPMMLock, &state);
+
     for (UInt64 i = 0; i < gVMPhycalMemoryBitmapSize; i++) {
         if (gVMPhycalMemoryBitmap[i] == 0xFF) continue;
         
@@ -103,13 +110,22 @@ void* VMPhysicalMemoryAllocatePage() {
             if ((gVMPhycalMemoryBitmap[i] & (1 << bit)) == 0) { 
                 UInt64 address = (i * 8 + bit) * kVMPageSize;
                 BITMAP_SET(gVMPhycalMemoryBitmap, address);
+
+                OSSpinlockUnlockIRQ(&sVMPMMLock, &state);
                 return (void*)address;
             }
         }
     }
+
+    OSSpinlockUnlockIRQ(&sVMPMMLock, &state);
     return nullptr; // Out of memory
 }
 
 void VMPhysicalMemoryFreePage(void* address) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMPMMLock, &state);
+
     BITMAP_UNSET(gVMPhycalMemoryBitmap, (UInt64)address);
+
+    OSSpinlockUnlockIRQ(&sVMPMMLock, &state);
 }

kernel/src/VM/VMM.c

@@ -4,6 +4,7 @@
 #include <VM/PMM.h>
 
 #include <OS/OSPanic.h>
+#include <OS/OSSpinlock.h>
 
 #include <GDT.h>
 #include <IDT.h>
@@ -20,6 +21,7 @@ enum {
 
 UInt64* gVMKernelPML4 = nullptr;
 UInt64 gVMKernelPML4Physical = 0;
+static OSSpinlock sVMVMMlock = {0};
 static bool isInitialized = false;
 
 extern UInt64 _kernel_start; 
@@ -36,7 +38,7 @@ static UInt64* sVMGetVirtualTable(UInt64 phys) {
     return (UInt64*)phys;
 }
 
-UInt64* VMVirtualMemoryMapPage(UInt64* pml4, UInt64 phys, UInt64 virt, UInt64 flags) {
+static UInt64* sVMVirtualMemoryMapPageInternal(UInt64* pml4, UInt64 phys, UInt64 virt, UInt64 flags) {
     UInt64 pt_idx = VMM_PT_INDEX(virt);
     UInt64 pd_idx = VMM_PD_INDEX(virt);
     UInt64 pdpt_idx = VMM_PDPT_INDEX(virt);
@@ -92,7 +94,7 @@ UInt64* VMVirtualMemoryMapPage(UInt64* pml4, UInt64 phys, UInt64 virt, UInt64 fl
     return (UInt64*)virt;
 }
 
-void VMVirtualMemoryUnmapPage(UInt64* pml4, UInt64 virt) {
+static void sVMVirtualMemoryUnmapPageInternal(UInt64* pml4, UInt64 virt) {
     UInt64 pt_idx = VMM_PT_INDEX(virt);
     UInt64 pd_idx = VMM_PD_INDEX(virt);
     UInt64 pdpt_idx = VMM_PDPT_INDEX(virt);
@@ -115,6 +117,27 @@ void VMVirtualMemoryUnmapPage(UInt64* pml4, UInt64 virt) {
     __asm__ volatile("invlpg (%0)" :: "r" (virt) : "memory");
 }
 
+
+UInt64* VMVirtualMemoryMapPage(UInt64* pml4, UInt64 phys, UInt64 virt, UInt64 flags) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMVMMlock, &state);
+
+    UInt64* result = sVMVirtualMemoryMapPageInternal(pml4, phys, virt, flags);
+
+    OSSpinlockUnlockIRQ(&sVMVMMlock, &state);
+    return result;
+}
+
+void VMVirtualMemoryUnmapPage(UInt64* pml4, UInt64 virt) {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMVMMlock, &state);
+
+    sVMVirtualMemoryUnmapPageInternal(pml4, virt);
+
+    OSSpinlockUnlockIRQ(&sVMVMMlock, &state);
+}
+
+
 void VMLoadCR3(UInt64 pml4_addr) {
     __asm__ volatile ("mov %0, %%cr3" :: "r"(pml4_addr) : "memory");
 }
@@ -144,8 +167,14 @@ void VMVirtualMemoryInitialize(Bootinfo* info) {
 }
 
 UInt64 VMVirtualMemoryCreateAddressSpace() {
+    OSSpinlockState state;
+    OSSpinlockLockIRQ(&sVMVMMlock, &state);
+    
     UInt64 phys = (UInt64)VMPhysicalMemoryAllocatePage();
-    if (!phys) return 0;
+    if (!phys) {
+        OSSpinlockUnlockIRQ(&sVMVMMlock, &state);
+        return 0;
+    };
 
     UInt64* virt = (UInt64*)PHYS_TO_HHDM(phys);
     memset(virt, 0, kVMPageSize);
@@ -156,6 +185,7 @@ UInt64 VMVirtualMemoryCreateAddressSpace() {
         virt[i] = kernel_pml4_virt[i];
     }
 
+    OSSpinlockUnlockIRQ(&sVMVMMlock, &state);
     return phys;
 }
 

kernel/src/kmain.c

@@ -11,6 +11,7 @@
 #include <IO/IOSerial.h>
 #include <IO/IOConsole.h>
 #include <IO/IOTimer.h>
+#include <IO/IOKeyboard.h>
 
 #include <OS/OSPanic.h>
 #include <OS/OSScheduler.h>
@@ -93,20 +94,20 @@ void kmain(Bootinfo* info) {
 
     SplashShow(&sIOGraphicsContext);
 
-    bool staying_in_ksh = false;
+    bool rescueMode = false;
     if (!info->initramfs.address) { 
-        IOConsoleLog("^rWARNING^!: Failed to load ^yinitramfs^!! Staying in kernel rescue shell!\n\n"); 
-        staying_in_ksh = true; 
+        IOConsoleLog("^rWARNING^!: Failed to load ^yStartupVolume^!! Staying in kernel rescue shell!\n\n"); 
+        rescueMode = true; 
     }
 
-    if (!staying_in_ksh) {
+    if (!rescueMode) {
         IOConsoleLog("Press any key to continue booting. \nPress ^yq^! to stay in ^gksh^!\n");
         char c = '\n';
-        c = IOConsoleGetCharacter();
-        if (c == 'q') staying_in_ksh = true;
+        c = IOKeyboardGetCharacter();
+        if (c == 'q') rescueMode = true;
     }
     
-    if (staying_in_ksh) OSSchedulerSpawn(ksh, nullptr, false, 0);
+    if (rescueMode) OSSchedulerSpawn(ksh, nullptr, false, 0);
     else OSSchedulerSpawn(init_task_entry, nullptr, false, 0);
     
     __asm__ volatile("sti");

userspace/debug/src/main.c

@@ -69,6 +69,7 @@ void render_list(Vector* numbers) {
 }
 
 int main() {
+    UInt64* bad_ptr = (UInt64*)0xDEADBEEF; *bad_ptr = 666;
     Vector nums;
     vector_init(&nums);
     printf("Heap test\n");