From 5b508f4a48029dceedc9207bb8a5ad5059229c87 Mon Sep 17 00:00:00 2001
From: SpookyDervish <nchand05@outlook.com>
Date: Wed, 28 Jan 2026 18:06:16 +1100
Subject: [PATCH] free, lock, reserve and unreserve pages

---
 OVMFbin/OVMF_VARS-pure-efi.fd     | Bin 131072 -> 131072 bytes
 kernel/bin/CustomOS.img           | Bin 48000000 -> 48000000 bytes
 kernel/bin/kernel.elf             | Bin 11816 -> 17000 bytes
 kernel/lib/PageFrameAllocator.o   | Bin 2168 -> 5376 bytes
 kernel/lib/kernel.o               | Bin 1656 -> 3056 bytes
 kernel/src/PageFrameAllocator.cpp |  87 +++++++++++++++++++++++++++++-
 kernel/src/PageFrameAllocator.h   |  11 ++++
 kernel/src/kernel.cpp             |  17 ++++++
 8 files changed, 114 insertions(+), 1 deletion(-)

diff --git a/OVMFbin/OVMF_VARS-pure-efi.fd b/OVMFbin/OVMF_VARS-pure-efi.fd
index e326b2059e1ec050b0e9e0dda1b969f132f01176..2f064e19e9ddab2399f3e281e259139d0d0f72ce 100644
GIT binary patch
delta 89
zcmZo@;Am*z*ifOxSTOmZmG<NVW?LpFgdCYHV6}m<aPvW{&%BI95ULnLl>n)Yypy%&
kI5Cz2nP)jSTP-{0x!GXV1@lcG9GIIweA@ou6XO9M0Lx4%ApigX

delta 111
zcmZo@;Am*z*ifOxm^S&KmG<NVW?LpFgdCYHV6}lUee*%9&%BHo5GoTwWkINH2$ch&
oav@Y6klM&QIV#18F(1f0%egr#@0jPN4-U-D6FzTFC_2Cc0CiR|KL7v#

diff --git a/kernel/bin/CustomOS.img b/kernel/bin/CustomOS.img
index 5aed5b1588e166d6bd24013e8d7b0986fab72eb0..79e7e65fcd2733f57b8fba2e00593ef6fbd86446 100644
GIT binary patch
delta 7661
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diff --git a/kernel/bin/kernel.elf b/kernel/bin/kernel.elf
index 24b35fdfed86f2ff0498a72ef04ffaf531ffd018..2d78f517d394380a1176b4ac256e8433e213e766 100755
GIT binary patch
literal 17000
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diff --git a/kernel/lib/PageFrameAllocator.o b/kernel/lib/PageFrameAllocator.o
index 43229dfe5e3c08662ca93dc729e34926a0c63e36..e5571e5d21ba3d624b215e12325566f0dfb2d6b4 100644
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diff --git a/kernel/lib/kernel.o b/kernel/lib/kernel.o
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GIT binary patch
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diff --git a/kernel/src/PageFrameAllocator.cpp b/kernel/src/PageFrameAllocator.cpp
index 83adc6c..b30ee5f 100644
--- a/kernel/src/PageFrameAllocator.cpp
+++ b/kernel/src/PageFrameAllocator.cpp
@@ -31,8 +31,16 @@ void PageFrameAllocator::ReadEFIMemoryMap(EFI_MEMORY_DESCRIPTOR* mMap, size_t mM
 
     InitBitmap(bitmapSize, largestFreeMemSeg);
 
-    //lock pages of bitmap
+    // lock pages of bitmap
+	LockPages(&PageBitmap, PageBitmap.Size / 4096 + 1);
+
     //reserve pages of unsable/reserverd memory
+	for (int i = 0; i < mMapEntries; i++) {
+        EFI_MEMORY_DESCRIPTOR* desc = (EFI_MEMORY_DESCRIPTOR*)((uint64_t)mMap + (i * mMapDescSize));
+        if (desc->type != 7) { // not efiConventionalMemory
+			ReservePages(desc->physAddr, desc->numPages);
+		}
+	}
 }
 
 void PageFrameAllocator::InitBitmap(size_t bitmapSize, void* bufferAddress){
@@ -41,4 +49,81 @@ void PageFrameAllocator::InitBitmap(size_t bitmapSize, void* bufferAddress){
     for (int i = 0; i < bitmapSize; i++){
         *(uint8_t*)(PageBitmap.Buffer + i) = 0; 
     }
+}
+
+void PageFrameAllocator::FreePage(void* address) {
+	uint64_t index = (uint64_t)address / 4096;
+	if (PageBitmap[index] == false) return; // page is already free
+
+	// free page in bitmap
+	PageBitmap.Set(index, false);
+	freeMemory += 4096;
+	usedMemory -= 4096;
+}
+
+void PageFrameAllocator::FreePages(void* address, uint64_t pageCount) {
+	for (int t = 0; t < pageCount; t++) {
+		FreePage((void*)((uint64_t)address + (t * 4096)));
+	}
+}
+
+void PageFrameAllocator::LockPage(void* address) {
+	uint64_t index = (uint64_t)address / 4096;
+	if (PageBitmap[index] == true) return; // page is already locked
+
+	// lock page in bitmap
+	PageBitmap.Set(index, true);
+	freeMemory -= 4096;
+	usedMemory += 4096;
+}
+
+void PageFrameAllocator::LockPages(void* address, uint64_t pageCount) {
+	for (int t = 0; t < pageCount; t++) {
+		LockPage((void*)((uint64_t)address + (t * 4096)));
+	}
+}
+
+void PageFrameAllocator::UnreservePage(void* address) {
+	uint64_t index = (uint64_t)address / 4096;
+	if (PageBitmap[index] == false) return; // page is already free
+
+	// free page in bitmap
+	PageBitmap.Set(index, false);
+	freeMemory += 4096;
+	reservedMemory -= 4096;
+}
+
+void PageFrameAllocator::UnreservePages(void* address, uint64_t pageCount) {
+	for (int t = 0; t < pageCount; t++) {
+		UnreservePage((void*)((uint64_t)address + (t * 4096)));
+	}
+}
+
+void PageFrameAllocator::ReservePage(void* address) {
+	uint64_t index = (uint64_t)address / 4096;
+	if (PageBitmap[index] == true) return; // page is already locked
+
+	// lock page in bitmap
+	PageBitmap.Set(index, true);
+	freeMemory -= 4096;
+	reservedMemory += 4096;
+}
+
+void PageFrameAllocator::ReservePages(void* address, uint64_t pageCount) {
+	for (int t = 0; t < pageCount; t++) {
+		ReservePage((void*)((uint64_t)address + (t * 4096)));
+	}
+}
+
+
+uint64_t PageFrameAllocator::GetFreeRAM() {
+	return freeMemory;
+}
+
+uint64_t PageFrameAllocator::GetUsedRAM() {
+	return usedMemory;
+}
+
+uint64_t PageFrameAllocator::GetReservedRAM() {
+	return reservedMemory;
 }
\ No newline at end of file
diff --git a/kernel/src/PageFrameAllocator.h b/kernel/src/PageFrameAllocator.h
index 634fe33..67f3da2 100644
--- a/kernel/src/PageFrameAllocator.h
+++ b/kernel/src/PageFrameAllocator.h
@@ -9,7 +9,18 @@ class PageFrameAllocator {
     public:
     void ReadEFIMemoryMap(EFI_MEMORY_DESCRIPTOR* mMap, size_t mMapSize, size_t mMapDescSize);
 	Bitmap PageBitmap;
+	void FreePage(void* address);
+	void FreePages(void* address, uint64_t pageCount);
+	void LockPage(void* address);
+	void LockPages(void* address, uint64_t pageCount);
+	uint64_t GetFreeRAM();
+	uint64_t GetUsedRAM();
+	uint64_t GetReservedRAM();
 
     private:
     void InitBitmap(size_t bitmapSize, void* bufferAddress);
+	void ReservePage(void* address);
+	void ReservePages(void* address, uint64_t pageCount);
+	void UnreservePage(void* address);
+	void UnreservePages(void* address, uint64_t pageCount);
 };
\ No newline at end of file
diff --git a/kernel/src/kernel.cpp b/kernel/src/kernel.cpp
index a1e0c32..6d417de 100644
--- a/kernel/src/kernel.cpp
+++ b/kernel/src/kernel.cpp
@@ -5,6 +5,7 @@
 #include "efiMemory.h"
 #include "memory.h"
 #include "Bitmap.h"
+#include "PageFrameAllocator.h"
 
 struct BootInfo {
 	Framebuffer* framebuffer;
@@ -27,6 +28,22 @@ extern "C" void _start(BootInfo* bootInfo) {
 	uint64_t mMapEntries = bootInfo->mMapSize / bootInfo->mMapDescriptorSize;
 
 
+	PageFrameAllocator newAllocator;
+	newAllocator.ReadEFIMemoryMap(bootInfo->mMap, bootInfo->mMapSize, bootInfo->mMapDescriptorSize);
+
+	newRenderer.Print(0xFFFFFFFF, "Free RAM: ");
+	newRenderer.Print(0xFF00FFFF, to_string(newAllocator.GetFreeRAM() / 1024));
+	newRenderer.Print(0xFF00FFFF, " KB");
+	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+	newRenderer.Print(0xFFFFFFFF, "Used RAM: ");
+	newRenderer.Print(0xFF00FFFF, to_string(newAllocator.GetUsedRAM() / 1024));
+	newRenderer.Print(0xFF00FFFF, " KB");
+	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+	newRenderer.Print(0xFFFFFFFF, "Reserved RAM: ");
+	newRenderer.Print(0xFF00FFFF, to_string(newAllocator.GetReservedRAM() / 1024));
+	newRenderer.Print(0xFF00FFFF, " KB");
+	newRenderer.cursorPosition = {0, newRenderer.cursorPosition.y + 18};
+
 	//newRenderer.Print(0xFFFFFFFF, to_string(GetMemorySize(bootInfo->mMap, mMapEntries, bootInfo ->mMapDescriptorSize)));