From dc825fb6d3e958bb013daa88bb9a5f230abad567 Mon Sep 17 00:00:00 2001
From: SpookyDervish <nchand05@outlook.com>
Date: Thu, 29 Jan 2026 13:06:49 +1100
Subject: [PATCH] mouse interrupts working

---
 OVMFbin/OVMF_VARS-pure-efi.fd        | Bin 131072 -> 131072 bytes
 kernel/bin/CustomOS.img              | Bin 48000000 -> 48000000 bytes
 kernel/bin/kernel.elf                | Bin 33368 -> 34416 bytes
 kernel/lib/interrupts/interrupts.o   | Bin 3768 -> 4136 bytes
 kernel/lib/kernel.o                  | Bin 1992 -> 1480 bytes
 kernel/lib/kernelUtil.o              | Bin 6048 -> 7552 bytes
 kernel/lib/userinput/mouse.o         | Bin 0 -> 5288 bytes
 kernel/src/interrupts/interrupts.cpp |  16 ++-
 kernel/src/interrupts/interrupts.h   |  10 +-
 kernel/src/kernel.cpp                |   9 +-
 kernel/src/kernelUtil.cpp            |  65 +++++++-----
 kernel/src/kernelUtil.h              |   1 +
 kernel/src/userinput/mouse.cpp       | 141 +++++++++++++++++++++++++++
 kernel/src/userinput/mouse.h         |  19 ++++
 14 files changed, 224 insertions(+), 37 deletions(-)
 create mode 100644 kernel/lib/userinput/mouse.o
 create mode 100644 kernel/src/userinput/mouse.cpp
 create mode 100644 kernel/src/userinput/mouse.h

diff --git a/OVMFbin/OVMF_VARS-pure-efi.fd b/OVMFbin/OVMF_VARS-pure-efi.fd
index 453efac287a45c34a39f35ba5951498dff82f2f9..4ecdf8bd27c62a19be03f1bfb988cd6076ee58bd 100644
GIT binary patch
delta 96
zcmZo@;Am*z*ifOxC^&gyk@n;RW?LpFgdCYHV6}l!X!FFP&%BJn5K06>i9#qbAhnTq
nveq0YMsXnXEazscWyd@>8?3scx#`0P_U3@^+XKEc3UB}bV+|;+

delta 107
zcmZo@;Am*z*ifOx@|S^uVRA#zoyiFyM<xqcZD9Jxu=$+MCtjxi5So!;^Fgc6yo`(x
qiU~q7Lnsyq#R{Z0@=o?Ea$;oLJh5nU@TLzR*qbN(*c{LxzySajm@D)E

diff --git a/kernel/bin/CustomOS.img b/kernel/bin/CustomOS.img
index 2f0d7ab7a015fd53dc3647ff7aa71d64b2a9382f..1c3648f1f94e68e916a22c614a12f5a0c42c1ad1 100644
GIT binary patch
delta 10325
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diff --git a/kernel/bin/kernel.elf b/kernel/bin/kernel.elf
index e334a67eb0e6bb2ee0ccea90dc0b4cb5fc0d0610..cb5248501a42d356abd2a535ebcaf316e6acc7f3 100755
GIT binary patch
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delta 5002
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diff --git a/kernel/lib/interrupts/interrupts.o b/kernel/lib/interrupts/interrupts.o
index b0e5086e7351b8087eed5391a91d3435af287a17..d5a75c65ad0a5e66a4ec9feb1b6726f47e99dd74 100644
GIT binary patch
delta 922
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delta 716
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diff --git a/kernel/lib/kernel.o b/kernel/lib/kernel.o
index 39b9e9a7633674306d2edd573429ee99ccceeec1..b8a476d70600aa02dcee32c916b40f29bb67b182 100644
GIT binary patch
delta 397
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z=94{`jLhSs3@rkR@{?1Gi+%G;i&Fy<le1Gx%D~1jFo-~D79b76fBr*&>g0z^;*)nU
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GI}ZQ}Kt*K$

literal 1992
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CsrPaK

diff --git a/kernel/lib/kernelUtil.o b/kernel/lib/kernelUtil.o
index d26aecac561f6d01dfc20f24706ea4f862791489..7f88e99661f28709b4590051868bdcba43f18f07 100644
GIT binary patch
literal 7552
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K(-u#D|NjBTmzN9x

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diff --git a/kernel/lib/userinput/mouse.o b/kernel/lib/userinput/mouse.o
new file mode 100644
index 0000000000000000000000000000000000000000..ea0b382f87cdb48b6b56739d9097a99d2e4432a9
GIT binary patch
literal 5288
zcmbuDe`s4(6vyw&y0y9=$z12A-5(kLV1+I;?W%5wWb5MIHaE*kQKn-{+UFXUCM9_-
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literal 0
HcmV?d00001

diff --git a/kernel/src/interrupts/interrupts.cpp b/kernel/src/interrupts/interrupts.cpp
index bcf694d..9683455 100644
--- a/kernel/src/interrupts/interrupts.cpp
+++ b/kernel/src/interrupts/interrupts.cpp
@@ -3,22 +3,22 @@
 #include "../IO.h"
 #include "../userinput/keyboard.h"
 
-__attribute__((interrupt)) void PageFault_Handler(struct interrupt_frame* frame) {
+__attribute__((interrupt)) void PageFault_Handler(interrupt_frame* frame) {
 	Panic("Page Fault");
 	while (true);
 }
 
-__attribute__((interrupt)) void DoubleFault_Handler(struct interrupt_frame* frame) {
+__attribute__((interrupt)) void DoubleFault_Handler(interrupt_frame* frame) {
 	Panic("Double Fault");
 	while (true);
 }
 
-__attribute__((interrupt)) void GPFault_Handler(struct interrupt_frame* frame) {
+__attribute__((interrupt)) void GPFault_Handler(interrupt_frame* frame) {
 	Panic("General Protection Fault");
 	while (true);
 }
 
-__attribute__((interrupt)) void KeyboardInterrupt_Handler(struct interrupt_frame* frame) {
+__attribute__((interrupt)) void KeyboardInterrupt_Handler(interrupt_frame* frame) {
 	uint8_t scancode = inb(0x60);
 
 	HandleKeyboard(scancode);
@@ -26,6 +26,14 @@ __attribute__((interrupt)) void KeyboardInterrupt_Handler(struct interrupt_frame
 	PIC_EndMaster();
 }
 
+__attribute__((interrupt)) void MouseInterrupt_Handler(interrupt_frame* frame) {
+	uint8_t mouseData = inb(0x60);
+
+	HandlePS2Mouse(mouseData);
+
+	PIC_EndSlave();
+}
+
 void PIC_EndMaster() {
 	outb(PIC1_COMMAND, PIC_EOI);
 }
diff --git a/kernel/src/interrupts/interrupts.h b/kernel/src/interrupts/interrupts.h
index 5529e8c..e4d7af6 100644
--- a/kernel/src/interrupts/interrupts.h
+++ b/kernel/src/interrupts/interrupts.h
@@ -1,5 +1,6 @@
 #pragma once
 #include "../BasicRenderer.h"
+#include "../userinput/mouse.h"
 
 #define PIC1_COMMAND 0x20
 #define PIC1_DATA    0x21
@@ -12,11 +13,12 @@
 #define ICW4_8086 0x01
 
 struct interrupt_frame;
-__attribute__((interrupt)) void PageFault_Handler(struct interrupt_frame* frame);
-__attribute__((interrupt)) void DoubleFault_Handler(struct interrupt_frame* frame);
-__attribute__((interrupt)) void GPFault_Handler(struct interrupt_frame* frame);
+__attribute__((interrupt)) void PageFault_Handler(interrupt_frame* frame);
+__attribute__((interrupt)) void DoubleFault_Handler(interrupt_frame* frame);
+__attribute__((interrupt)) void GPFault_Handler(interrupt_frame* frame);
 
-__attribute__((interrupt)) void KeyboardInterrupt_Handler(struct interrupt_frame* frame);
+__attribute__((interrupt)) void KeyboardInterrupt_Handler(interrupt_frame* frame);
+__attribute__((interrupt)) void MouseInterrupt_Handler(interrupt_frame* frame);
 
 void RemapPIC();
 void PIC_EndMaster();
diff --git a/kernel/src/kernel.cpp b/kernel/src/kernel.cpp
index 2d25849..d95d1d6 100644
--- a/kernel/src/kernel.cpp
+++ b/kernel/src/kernel.cpp
@@ -3,12 +3,11 @@
 extern "C" void _start(BootInfo* bootInfo) {
 	KernelInfo kernelInfo = InitializeKernel(bootInfo);
 	PageTableManager* pageTableManager = kernelInfo.pageTableManager;
-
-	GlobalRenderer->ClearColour = 0xFF191919;
-	GlobalRenderer->Clear();
-	GlobalRenderer->Print("Kernel initialized successfully!");
-	GlobalRenderer->Next();
 	
+	while (true) {
+		ProcessMousePacket();
+	}
+
 	// make sure we never return from our OS
 	while (true);
 }
\ No newline at end of file
diff --git a/kernel/src/kernelUtil.cpp b/kernel/src/kernelUtil.cpp
index 178db35..e40017e 100644
--- a/kernel/src/kernelUtil.cpp
+++ b/kernel/src/kernelUtil.cpp
@@ -45,40 +45,31 @@ void PrepareMemory(BootInfo* bootInfo){
 }
 
 IDTR idtr;
+
+void SetIDTGate(void* handler, uint8_t entryOffset, uint8_t type_attr, uint8_t selector) {
+	IDTDescEntry* interrupt = (IDTDescEntry*)(idtr.Offset + entryOffset * sizeof(IDTDescEntry));
+	interrupt->SetOffset((uint64_t)handler);
+	interrupt->type_attr = type_attr;
+	interrupt->selector = selector;
+}
+
 void PrepareInterrupts() {
 	idtr.Limit = 0x0FFF;
 	idtr.Offset = (uint64_t)GlobalAllocator.RequestPage();
 	memset((void*)idtr.Offset, 0, 0x1000);
 
-	IDTDescEntry* int_PageFault = (IDTDescEntry*)(idtr.Offset + 0xE * sizeof(IDTDescEntry));
-	int_PageFault->SetOffset((uint64_t)PageFault_Handler);
-	int_PageFault->type_attr = IDT_TA_InterruptGate;
-	int_PageFault->selector = 0x08; // kernel code segment
-
-	IDTDescEntry* int_DoubleFault = (IDTDescEntry*)(idtr.Offset + 0x8 * sizeof(IDTDescEntry));
-	int_DoubleFault->SetOffset((uint64_t)DoubleFault_Handler);
-	int_DoubleFault->type_attr = IDT_TA_InterruptGate;
-	int_DoubleFault->selector = 0x08; // kernel code segment
-
-	IDTDescEntry* int_GPFault = (IDTDescEntry*)(idtr.Offset + 0xD * sizeof(IDTDescEntry));
-	int_GPFault->SetOffset((uint64_t)GPFault_Handler);
-	int_GPFault->type_attr = IDT_TA_InterruptGate;
-	int_GPFault->selector = 0x08; // kernel code segment
-
-	IDTDescEntry* int_Keyboard = (IDTDescEntry*)(idtr.Offset + 0x21 * sizeof(IDTDescEntry));
-	int_Keyboard->SetOffset((uint64_t)KeyboardInterrupt_Handler);
-	int_Keyboard->type_attr = IDT_TA_InterruptGate;
-	int_Keyboard->selector = 0x08; // kernel code segment
+	
+	SetIDTGate((void*)PageFault_Handler, 0xE, IDT_TA_InterruptGate, 0x08);
+	SetIDTGate((void*)DoubleFault_Handler, 0x8, IDT_TA_InterruptGate, 0x08);
+	SetIDTGate((void*)GPFault_Handler, 0xD, IDT_TA_InterruptGate, 0x08);
+	SetIDTGate((void*)KeyboardInterrupt_Handler, 0x21, IDT_TA_InterruptGate, 0x08);
+	SetIDTGate((void*)MouseInterrupt_Handler, 0x2C, IDT_TA_InterruptGate, 0x08);
 
 	// load idt
 	asm("lidt %0" : : "m" (idtr));
 
 	// remap pic so we can get hardware interrupts
 	RemapPIC();
-	outb(PIC1_DATA, 0b11111101); // unmask 2nd interrupt
-	outb(PIC2_DATA, 0b11111111);
-
-	asm ("sti");
 }
 
 BasicRenderer r = BasicRenderer(NULL, NULL);
@@ -86,16 +77,42 @@ KernelInfo InitializeKernel(BootInfo* bootInfo){
 	r = BasicRenderer(bootInfo->framebuffer, bootInfo->psf1_Font);
 	GlobalRenderer = &r;
 
+	GlobalRenderer->ClearColour = 0xFF191919;
+	GlobalRenderer->Clear();
+
+	GlobalRenderer->Print("Setting up GDT...");
+	GlobalRenderer->Next();
+
 	GDTDescriptor gdtDescriptor;
 	gdtDescriptor.Size = sizeof(GDT) - 1;
 	gdtDescriptor.Offset = (uint64_t)&DefaultGDT;
 	LoadGDT(&gdtDescriptor);
 
+	GlobalRenderer->Print("Preparing memory... (this doesn't always work, you may need to restart. sorry.)");
+	GlobalRenderer->Next();
+
     PrepareMemory(bootInfo);
 
-    memset(bootInfo->framebuffer->BaseAddress, 0, bootInfo->framebuffer->BufferSize);
+    //memset(bootInfo->framebuffer->BaseAddress, 0, bootInfo->framebuffer->BufferSize);
+
+	GlobalRenderer->Print("Setting up interrupts...");
+	GlobalRenderer->Next();
 
 	PrepareInterrupts();
 
+	GlobalRenderer->Print("Setting up mouse...");
+	GlobalRenderer->Next();
+	InitPS2Mouse();
+
+	outb(PIC1_DATA, 0b11111001); // unmask 2nd interrupt
+	outb(PIC2_DATA, 0b11101111);
+
+	asm ("sti"); // enable interrupts
+
+	GlobalRenderer->Print("Init complete!");
+	GlobalRenderer->Next();
+
+
+
     return kernelInfo;
 }
\ No newline at end of file
diff --git a/kernel/src/kernelUtil.h b/kernel/src/kernelUtil.h
index 9beba51..9343c76 100644
--- a/kernel/src/kernelUtil.h
+++ b/kernel/src/kernelUtil.h
@@ -11,6 +11,7 @@
 #include "paging/PageMapIndexer.h"
 #include "paging/paging.h"
 #include "paging/PageTableManager.h"
+#include "userinput/mouse.h"
 
 struct BootInfo {
 	Framebuffer* framebuffer;
diff --git a/kernel/src/userinput/mouse.cpp b/kernel/src/userinput/mouse.cpp
new file mode 100644
index 0000000..188acdc
--- /dev/null
+++ b/kernel/src/userinput/mouse.cpp
@@ -0,0 +1,141 @@
+#include "mouse.h"
+#include "../IO.h"
+
+void MouseWait() {
+	uint64_t timeout = 100000;
+	while (timeout--) {
+		if (inb(0x64) & 0b10 == 0)
+			return;
+	}
+	
+}
+
+void MouseWaitInput() {
+	uint64_t timeout = 100000;
+	while (timeout--) {
+		if (inb(0x64) & 0b1)
+			return;
+	}
+	
+}
+
+void MouseWrite(uint8_t value) {
+	MouseWait();
+	outb(0x64, 0xD4);
+	MouseWait();
+	outb(0x60, value);
+}
+
+uint8_t MouseRead() {
+	MouseWaitInput();
+	return inb(0x60);
+}
+
+uint8_t mouseCycle = 0;
+uint8_t mousePacket[4];
+bool mousePacketReady = false;
+
+Point mousePosition;
+
+void HandlePS2Mouse(uint8_t data) {
+	switch (mouseCycle) {
+		case 0:
+			if (mousePacketReady) break;
+
+			if (data & 0b00001000 == 0) break;
+
+			mousePacket[0] = data;
+			mouseCycle++;
+			break;
+		case 1:
+			if (mousePacketReady) break;
+			mousePacket[1] = data;
+			mouseCycle++;
+			break;
+		case 2:
+			if (mousePacketReady) break;
+			mousePacket[2] = data;
+			mousePacketReady = true;
+			mouseCycle = 0;
+			break;
+	}
+}
+
+void ProcessMousePacket() {
+	if (!mousePacketReady) return;
+	mousePacketReady = false;
+
+	bool xNegative, yNegative, xOverflow, yOverflow;
+
+	if (mousePacket[0] & PS2XSign) {
+		xNegative = true;
+	} else xNegative = false;
+
+	if (mousePacket[0] & PS2YSign) {
+		yNegative = true;
+	} else yNegative = false;
+
+	if (mousePacket[0] & PS2XOverflow) {
+		xOverflow = true;
+	} else xOverflow = false;
+
+	if (mousePacket[0] & PS2YOverflow) {
+		yOverflow = true;
+	} else yOverflow = false;
+
+	if (!xNegative) {
+		mousePosition.x += mousePacket[1];
+		if (xOverflow) {
+			mousePosition.x += 255;
+		}
+	} else {
+		mousePacket[1] = 256 - mousePacket[1];
+		mousePosition.x -= mousePacket[1];
+		if (xOverflow) {
+			mousePosition.x -= 255;
+		}
+	}
+
+	if (!yNegative) {
+		mousePosition.y -= mousePacket[2];
+		if (yOverflow) {
+			mousePosition.y -= 255;
+		}
+	} else {
+		mousePacket[2] = 256 - mousePacket[2];
+		mousePosition.y += mousePacket[2];
+		if (yOverflow) {
+			mousePosition.y += 255;
+		}
+	}
+
+	if (mousePosition.x < 0) mousePosition.x = 0;
+	if (mousePosition.x > GlobalRenderer->targetFramebuffer->Width-1) mousePosition.x = GlobalRenderer->targetFramebuffer->Width;
+	if (mousePosition.y < 0) mousePosition.y = 0;
+	if (mousePosition.y > GlobalRenderer->targetFramebuffer->Height-1) mousePosition.y = GlobalRenderer->targetFramebuffer->Height;
+}
+
+void InitPS2Mouse() {
+
+	// enable aux device mouse
+	outb(0x64, 0xA8);
+	MouseWait();
+
+	outb(0x64, 0x20); // tells the keyboard controller we want to send a command to the mouse
+	MouseWaitInput();
+
+	uint8_t status = inb(0x60);
+	status |= 0b10;
+	MouseWait();
+
+	outb(0x64, 0x60);
+	MouseWait();
+
+	outb(0x60, status); // setting the correct bit in the "compaq" status byte
+
+	MouseWrite(0xF6); // default settings
+	MouseRead();
+
+	MouseWrite(0xF4);
+	MouseRead();
+}
\ No newline at end of file
diff --git a/kernel/src/userinput/mouse.h b/kernel/src/userinput/mouse.h
new file mode 100644
index 0000000..f85beb8
--- /dev/null
+++ b/kernel/src/userinput/mouse.h
@@ -0,0 +1,19 @@
+#pragma once
+#include <stdint.h>
+#include "../math.h"
+#include "../BasicRenderer.h"
+
+#define PS2LeftButton 0b00000001
+#define PS2MiddleButton 0b00000010
+#define PS2RightButton 0b00000100
+
+#define PS2XSign 0b00010000
+#define PS2YSign 0b00100000
+#define PS2XOverflow 0b01000000
+#define PS2YOverflow 0b10000000
+
+extern Point mousePosition;
+
+void InitPS2Mouse();
+void HandlePS2Mouse(uint8_t data);
+void ProcessMousePacket();
\ No newline at end of file