request pages

kernel/src/PageFrameAllocator.cpp

@@ -115,6 +115,16 @@ void PageFrameAllocator::ReservePages(void* address, uint64_t pageCount) {
 	}
 }
 
+void* PageFrameAllocator::RequestPage() {
+	for (uint64_t index = 0; index < PageBitmap.Size * 8; index++) {
+		if (PageBitmap[index] == true) continue;
+
+		LockPage((void*)(index * 4096));
+		return (void*)(index * 4096);
+	}
+
+	return NULL; // page frame swap to file
+}
 
 uint64_t PageFrameAllocator::GetFreeRAM() {
 	return freeMemory;

kernel/src/PageFrameAllocator.h

@@ -13,6 +13,7 @@ class PageFrameAllocator {
 	void FreePages(void* address, uint64_t pageCount);
 	void LockPage(void* address);
 	void LockPages(void* address, uint64_t pageCount);
+	void* RequestPage();
 	uint64_t GetFreeRAM();
 	uint64_t GetUsedRAM();
 	uint64_t GetReservedRAM();

kernel/src/kernel.cpp

@@ -44,6 +44,13 @@ extern "C" void _start(BootInfo* bootInfo) {
 	newRenderer.Print(0xFF00FFFF, " KB");
 	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
 
+	for (int t = 0; t < 20; t++) {
+		void* address = newAllocator.RequestPage();
+		newRenderer.Print(0xFFFFFFFF, "0x");
+		newRenderer.Print(0xFFFFFFFF, to_hstring((uint64_t)address));
+		newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+	}
+
 	//newRenderer.Print(0xFFFFFFFF, to_string(GetMemorySize(bootInfo->mMap, mMapEntries, bootInfo ->mMapDescriptorSize)));