page table testing

kernel/src/Bitmap.cpp

@@ -1,6 +1,8 @@
 #include "Bitmap.h"
 
 bool Bitmap::operator[](uint64_t index){
+	if (index > Size * 8) return false;
+
     uint64_t byteIndex = index / 8;
     uint8_t bitIndex = index % 8;
     uint8_t bitIndexer = 0b10000000 >> bitIndex;
@@ -11,7 +13,9 @@ bool Bitmap::operator[](uint64_t index){
 }
 
 
-void Bitmap::Set(uint64_t index, bool value){
+bool Bitmap::Set(uint64_t index, bool value){
+	if (index > Size * 8) return false;
+
     uint64_t byteIndex = index / 8;
     uint8_t bitIndex = index % 8;
     uint8_t bitIndexer = 0b10000000 >> bitIndex;
@@ -19,4 +23,6 @@ void Bitmap::Set(uint64_t index, bool value){
     if (value) {
         Buffer[byteIndex] |= bitIndexer;
     }
+
+	return true;
 }

kernel/src/Bitmap.h

@@ -7,5 +7,5 @@ class Bitmap {
     size_t Size;
     uint8_t* Buffer;
     bool operator[](uint64_t index);
-    void Set(uint64_t index, bool value);
+    bool Set(uint64_t index, bool value);
 };

kernel/src/kernel.cpp

@@ -28,8 +28,14 @@ extern uint64_t _KernelStart;
 extern uint64_t _KernelEnd;
 
 extern "C" void _start(BootInfo* bootInfo) {
+
+	
+
 	BasicRenderer newRenderer = BasicRenderer(bootInfo->framebuffer, bootInfo->psf1_Font);
 
+	newRenderer.Print("Setting up memory map...");
+	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+
 	// display information of memory map
 	uint64_t mMapEntries = bootInfo->mMapSize / bootInfo->mMapDescriptorSize;
 
@@ -53,14 +59,23 @@ extern "C" void _start(BootInfo* bootInfo) {
 
 	uint64_t fbBase = (uint64_t)bootInfo->framebuffer->BaseAddress;
 	uint64_t fbSize = (uint64_t)bootInfo->framebuffer->BufferSize + 0x1000;
-
+	GlobalAllocator.LockPages((void*)fbBase, fbSize / 0x1000 + 1);
 	for (uint64_t t = fbBase; t < fbBase + fbSize; t += 4096) {
 		pageTableManager.MapMemory((void*)t, (void*)t);
 	}
 
 	asm("mov %0, %%cr3" :: "r" (PML4));
+	memset(bootInfo->framebuffer->BaseAddress, 0, bootInfo->framebuffer->BufferSize);
 
-	newRenderer.Print("WE'RE USING THE NEW PAGE MAP!!!!");
+	newRenderer.Print("Page map set up!");
+	pageTableManager.MapMemory((void*)0x600000000, (void*)0x80000);
+
+	uint64_t* test = (uint64_t*)0x600000000;
+	*test = 26;
+
+	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+	newRenderer.Print("this should be \"26\": ");
+	newRenderer.Print(to_string(*test));
 
 	return;
 }

kernel/src/paging/PageFrameAllocator.cpp

@@ -57,9 +57,10 @@ void PageFrameAllocator::FreePage(void* address) {
 	if (PageBitmap[index] == false) return; // page is already free
 
 	// free page in bitmap
-	PageBitmap.Set(index, false);
-	freeMemory += 4096;
-	usedMemory -= 4096;
+	if (PageBitmap.Set(index, false)) {
+		freeMemory += 4096;
+		usedMemory -= 4096;
+	}
 }
 
 void PageFrameAllocator::FreePages(void* address, uint64_t pageCount) {
@@ -73,9 +74,10 @@ void PageFrameAllocator::LockPage(void* address) {
 	if (PageBitmap[index] == true) return; // page is already locked
 
 	// lock page in bitmap
-	PageBitmap.Set(index, true);
-	freeMemory -= 4096;
-	usedMemory += 4096;
+	if (PageBitmap.Set(index, true)) {
+		freeMemory -= 4096;
+		usedMemory += 4096;
+	}
 }
 
 void PageFrameAllocator::LockPages(void* address, uint64_t pageCount) {
@@ -89,9 +91,10 @@ void PageFrameAllocator::UnreservePage(void* address) {
 	if (PageBitmap[index] == false) return; // page is already free
 
 	// free page in bitmap
-	PageBitmap.Set(index, false);
-	freeMemory += 4096;
-	reservedMemory -= 4096;
+	if (PageBitmap.Set(index, false)) {
+		freeMemory += 4096;
+		reservedMemory -= 4096;
+	}
 }
 
 void PageFrameAllocator::UnreservePages(void* address, uint64_t pageCount) {
@@ -105,9 +108,10 @@ void PageFrameAllocator::ReservePage(void* address) {
 	if (PageBitmap[index] == true) return; // page is already locked
 
 	// lock page in bitmap
-	PageBitmap.Set(index, true);
-	freeMemory -= 4096;
-	reservedMemory += 4096;
+	if (PageBitmap.Set(index, true)) {
+		freeMemory -= 4096;
+		reservedMemory += 4096;
+	}
 }
 
 void PageFrameAllocator::ReservePages(void* address, uint64_t pageCount) {