From 1ef6ed223e0a8f8f4bba36a4081498ae83de9c9b Mon Sep 17 00:00:00 2001
From: SpookyDervish <nchand05@outlook.com>
Date: Wed, 28 Jan 2026 20:49:24 +1100
Subject: [PATCH] page table testing

---
 OVMFbin/OVMF_VARS-pure-efi.fd            | Bin 131072 -> 131072 bytes
 kernel/Makefile                          |   2 +-
 kernel/bin/CustomOS.img                  | Bin 48000000 -> 48000000 bytes
 kernel/bin/kernel.elf                    | Bin 17704 -> 17728 bytes
 kernel/lib/Bitmap.o                      | Bin 1568 -> 1616 bytes
 kernel/lib/kernel.o                      | Bin 3224 -> 3768 bytes
 kernel/lib/paging/PageFrameAllocator.o   | Bin 5704 -> 5720 bytes
 kernel/src/Bitmap.cpp                    |   8 ++++++-
 kernel/src/Bitmap.h                      |   2 +-
 kernel/src/kernel.cpp                    |  19 +++++++++++++--
 kernel/src/paging/PageFrameAllocator.cpp |  28 +++++++++++++----------
 11 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/OVMFbin/OVMF_VARS-pure-efi.fd b/OVMFbin/OVMF_VARS-pure-efi.fd
index e1e2fa3f13f772fd6bab269ef2f0ff54b0d2b02a..f7a0a6b31124284143bade91952f5ed52021845f 100644
GIT binary patch
delta 60
zcmZo@;Am*z*kGnLd7G-z<ONm=EHfAw7$!FaZJTTras(te$)jL%O4yv4n;XLJXm0w@
Pz|w5+WxK%_#s+Qx$%+{m

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diff --git a/kernel/Makefile b/kernel/Makefile
index aade3a8..63d9893 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -59,4 +59,4 @@ buildimg:
 	mcopy -i $(BUILDDIR)/$(OSNAME).img $(BUILDDIR)/zap-light18.psf ::
 
 run:
-	qemu-system-x86_64 -drive file=$(BUILDDIR)/$(OSNAME).img -m 64M -cpu qemu64 -drive if=pflash,format=raw,unit=0,file="$(OVMFDIR)/OVMF_CODE-pure-efi.fd",readonly=on -drive if=pflash,format=raw,unit=1,file="$(OVMFDIR)/OVMF_VARS-pure-efi.fd" -net none
+	qemu-system-x86_64 -drive file=$(BUILDDIR)/$(OSNAME).img -m 256M -cpu qemu64 -drive if=pflash,format=raw,unit=0,file="$(OVMFDIR)/OVMF_CODE-pure-efi.fd",readonly=on -drive if=pflash,format=raw,unit=1,file="$(OVMFDIR)/OVMF_VARS-pure-efi.fd" -net none
diff --git a/kernel/bin/CustomOS.img b/kernel/bin/CustomOS.img
index b1a0cbaa810079edeaeab39d0f352e054e16f1a1..0f767c55832ff93858b7a24ae16c0566141177a8 100644
GIT binary patch
delta 6312
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diff --git a/kernel/bin/kernel.elf b/kernel/bin/kernel.elf
index 0fcb592759ecb825a0dba94f271eb2e061724d5e..f4eb75f8b9e963eaf1615dd73f8962f9bfbfac4e 100755
GIT binary patch
delta 3216
zcmai14NM#78NTn}0!9Rk`LX$n&jyD8id#?%0g~{0^g_m#lF(Kfp-Kg7N=it;ky4G!
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delta 2487
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diff --git a/kernel/lib/Bitmap.o b/kernel/lib/Bitmap.o
index dc62cadebfe001e2c7a26e53be983aabdbd05fbd..dd11b57b7bbe9ae0c2d7e7b08515b259521efd7e 100644
GIT binary patch
delta 311
zcmZ3$bAe}q24lcPO*PRM9^DKc2OltdSi3$bX5Ya81h0K3uC<!jrX_(Q#|4&q*#%TE
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pK*!{rEcT2$CjSJJmaO(n0!)*uSnWU(toEEQm>>qHPd>;j4*)#PN*w?I

delta 240
zcmcb>vw&xU2BX46O|^-S%_q*&n)tYhal+&*MmaVHFqquV7-|#^Vmk5(v@tpJvN476
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kGj>eYWCf9#toBR~7$>h{wF618+H>w;f|#8?`6IJD00EIO+yDRo

diff --git a/kernel/lib/kernel.o b/kernel/lib/kernel.o
index d0cd876524a70b9c3728b7feb541fbb444a794f5..7cf5c3a229272acc23c30cf3ea50d00974036c63 100644
GIT binary patch
literal 3768
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z%P<o5I~BX^B9op4+7R4mxV`4ttZy`gGZWTS&W>9J81k}21CTr3!HGgHep0Y_av%jP
z<M5d6`dD)Ioc(W!o{73e*cB+}Odd`cJbnD@zYF*j{tZ8}DB}WefgZ1~#NQG)z8QFj
zB>suOk&pL(!*{cJC4>u=+zH{*&s~9||2@zoj`slt{qKb)@m~-GK^*^LNPHKZSClZ`
zrQjH+<nI$Wu8VJn#1Ay#Kcn#RcU$t0DR{SnPbhegf>#tA@3r)EMZq6b@IM5Od8zSl
zD10^kN011Dd8z&_1y|$D3LHD!cm9tG`gaw+y6=}1T=jo5<mYMdfwHdfRX;x~cpva&
z9sX2smA@B*1HrtoNxlYS6f_g2T#xbZ7LLBS=;ejHYfTXyZiU}x<;byfmhRf~F3~fV
zYY}~_Tqe3x^p$impSKGzS17u+4!@-@@Yhf1Glhy?a*8F}aTmY_J=xjRG`@Ip<^R=d
zV2xXjcUF~{P<lmu<eWGjQYHIggmsGrh(D-{!mNqn;hjQTJZmWX{Epy$A|6_Xm|;Nh
z!|Oi}IQk6J|Es+Lw&+vcV^D+jW2h(+UOx(Rhz%$l9M(iY^1qFomiDqg4ij=LIoN*|
zPDo6Kxe36r)ZzG-g?%_KS%2Y<ybS~N8MgmP*uN%;q7U2SDQvX=HGEt_<odY(_zp{Z
vx&MvUM!R8j3UXT{jBgP_VSDu1uvFqee-$cNNG13tHnOja_+6M+C2ao>ntlbj

delta 1069
zcmZ{iUr19?9LLW+o7=9t*D0dgn&zDi3yUZs!xwYO!Be4**${iHHAo22We_1q^oPbp
zy4xWbJ^2#sA!6Y}Lon8pJ%vVu^t4_|sHYyvAXvY1c5fbvesF&0oX_vy_i|6AyBM|(
z;gFi|Pe;vrH|zB}HHSmgeAGB*jWq;De|)DovXXyyv7<yyQlhVRG<v7104&43%tn;M
z6BRgB)=(=#FGWpmV@K>}szR5^1DbnJ9kf9#9{SQl&6GvWF{_dA=1;<HVzG6ldufH{
z_TV6~0)^_`>W$~rk&38^Ktxpr!#>)?RRDhtlB%#5#iSxkD*ijED3Z+-G=TzTlMa$%
zc9VZhK<(Y8%N<-Q>v#3_@dH9r<Y1B*smZhBqs9eFjBzq$B;upQ7>g&OVC<pGU}e`r
zdjvyvyruO%9??CnPON!-Ebb4pgnLdEF$l-lM|Y6b+#w~+PfAJnRpG0`e-d72^G!h|
zBK&FLGs5S&FL)+b=RCv8zVYKH&Rn`alTK!4uVk{B?8!uSW_E!j&ZpVBH?lO(<%4lu
zURb;EySXiL2<Gs{4WW{KaQLrAdcACOH|#!G4u2u#s}dLQ0ih)^pjiskqym|LmN*yc
z4ESbqKG-kupEmznsG>9iJYPcx_8LW`fG#yU%G%UmctVN>r061xtHE<y|B3F}oQrTt
zRbCFjxQI4b&c}4&)mzQ`72J#2WB)+2<>5&P)fD!@KY%Y|cq^UoR^04}7L%{nw3vF;
z?ipp%dJn5;AvI@{E*5vUv#(I{MCzc&a0#=dK7_Y1E5J7AV{i2#^%xflR%YRrQ)-P%
U1bfD&;kLqmE!cwS_|&ic224Ow9smFU

diff --git a/kernel/lib/paging/PageFrameAllocator.o b/kernel/lib/paging/PageFrameAllocator.o
index 8e51d5b11d633990324389144039f71f0b13a276..e6f966d92ae596e05b0c550d606d8c5fbfcb1c78 100644
GIT binary patch
delta 861
zcmZ{hKS&%w6vpT6t;!v^cYFRBHz~pvAxc!(Mz6aZh7fIxX%Yy5yV6P|DePk4BB%r+
zUn6L<olW5Mu+ipXWg~hZn2>~UV8k|EAPLEv*;%r=;J|$I=Ka2TGrR9_`2FykK^oW|
z8nNgeex(NNYUBBB%vpQ9J+aO9(teHO)X3G2`lWqN*{a}Ca&k-7M0cn40v|hr?5lrr
zi@4qu{O5bZxi(*YqidI_fSI(U3(Tf(P!-GR;$+!U^@MmBE#fT+kryO(OkS5^)-?H*
zRAkgo<M4;cJ8(17E87u`Pfc?bRjq&$(^^MF-DnY;h8|!(Bk8ohoH<L;7%GmW39VCD
z<M@%*4ZP#{GXh6?mU)D_Ez9%g?`U+x&q}(c)yE9Sqe{JJ3BS5L_V3~)(+>%ntah&J
zeAD_JEw0vqFehmeZcciu=2O+;Bx=@BV$VM2Sr4@y>r<bUdcOGu>Qryy)KfH>RueS&
z&V7(8y(2?aXH*z}#TNwb9F-BWCvIDVxf;r=W&us6ar3w%dc@QL<^MMCP8+>Iz_eg)
zUu>f_RG1zZ+GwMvSj(T$SIqW|(>lVQBHcubbr629(hBQcgsk_`VqJjWSER?Nus%S@
Lx`mcjzyH=BMy|@b

delta 871
zcmb7>F=$g!6o%h<Nm>&y$xBmj-y~Ty(kgwT)J4*?D9@ott>99GZbF9=a0v<~f@0~S
z{6j4`v>+~_!fPl<LF`b_L6i)(b?i_m=#ouQwCCJ+AI3O&;eGdT{{NhN?z_7~?}i>1
z=}2(uwC#@h3zrW3g^6z)7B7GPgFpZFKtdGa8#IP9u>qWq=W#Rk;y=9A=7Yoy%G9J$
zIh}oIk00%^@8C<1m#P1iyNkhI?;qbR=em5&M(;Y&FlLg9woy$Ury7=$r7P36^s}sM
z;byIpW#ufgUYfja!&=Ma@5e%8&G>(qyp2Lix!2=iI;y(LU8GwPldLW$Le(*~&y2c;
zdP>n&b1AhGqqC@_6_qqEV};`>%|*00{)}>3xxdVCa$1JJpTEPEfR|B}({wSz@d=?j
zYlarT93J^s@q|4s5OY^o?Q4ETn={`vFQSlD?mcrc+0q>yo?|krsDV23mF61+9KRR3
zj=8W@<vXe-u*d4{4z+Wt1{_DZuZ=2Kl`xw5Bg)PkO(S4W^hlem%M!1A!`NdrdMf_^
zdPS-YC->*6M!VE)lvypB(`#MoGAgXD8FjNu-NH(4hd!a&H$smP^p&U|ZRP;Hys*MN
bhk$tjZRRa_{U!2IVU8kTK1Ey8J9hFA40p=}

diff --git a/kernel/src/Bitmap.cpp b/kernel/src/Bitmap.cpp
index 2165f2f..753b6e3 100644
--- a/kernel/src/Bitmap.cpp
+++ b/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;
 }
\ No newline at end of file
diff --git a/kernel/src/Bitmap.h b/kernel/src/Bitmap.h
index fc5512b..45056b9 100644
--- a/kernel/src/Bitmap.h
+++ b/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);
 };
\ No newline at end of file
diff --git a/kernel/src/kernel.cpp b/kernel/src/kernel.cpp
index d0cbcf6..e934860 100644
--- a/kernel/src/kernel.cpp
+++ b/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;
 }
\ No newline at end of file
diff --git a/kernel/src/paging/PageFrameAllocator.cpp b/kernel/src/paging/PageFrameAllocator.cpp
index 674b377..1bf43f8 100644
--- a/kernel/src/paging/PageFrameAllocator.cpp
+++ b/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) {