panic screen

kernel/src/BasicRenderer.cpp

@@ -40,4 +40,23 @@ void BasicRenderer::Print(const char* str) {
 
 		chr++;
 	}
+}
+
+void BasicRenderer::Clear(uint32_t colour) {
+	uint64_t fbBase = (uint64_t)targetFramebuffer->BaseAddress;
+    uint64_t bytesPerScanline = targetFramebuffer->PixelsPerScanline * 4;
+    uint64_t fbHeight = targetFramebuffer->Height;
+    uint64_t fbSize = targetFramebuffer->BufferSize;
+
+    for (int verticalScanline = 0; verticalScanline < fbHeight; verticalScanline ++){
+        uint64_t pixPtrBase = fbBase + (bytesPerScanline * verticalScanline);
+        for (uint32_t* pixPtr = (uint32_t*)pixPtrBase; pixPtr < (uint32_t*)(pixPtrBase + bytesPerScanline); pixPtr ++){
+            *pixPtr = colour;
+        }
+    }
+}
+
+void BasicRenderer::Next() {
+	cursorPosition.x = 0;
+	cursorPosition.y += 16;
 }

kernel/src/BasicRenderer.h

@@ -2,6 +2,7 @@
 #include "math.h"
 #include "Framebuffer.h"
 #include "PSF1Font.h"
+#include <stdint.h>
 
 class BasicRenderer {
 	public:
@@ -12,6 +13,8 @@ class BasicRenderer {
 		unsigned int Colour;
 		void Print(const char* str);
 		void PutChar(char chr, unsigned int xOff, unsigned int yOff);
+		void Clear(uint32_t colour);
+		void Next();
 };
 
 extern BasicRenderer* GlobalRenderer;

kernel/src/interrupts/interrupts.cpp

@@ -1,6 +1,17 @@
 #include "interrupts.h"
+#include "../panic.h"
 
 __attribute__((interrupt)) void PageFault_Handler(struct interrupt_frame* frame) {
-	GlobalRenderer->Print("Page fault caught!");
+	Panic("Page Fault");
+	while (true);
+}
+
+__attribute__((interrupt)) void DoubleFault_Handler(struct interrupt_frame* frame) {
+	Panic("Double Fault");
+	while (true);
+}
+
+__attribute__((interrupt)) void GPFault_Handler(struct interrupt_frame* frame) {
+	Panic("General Protection Fault");
 	while (true);
 }

kernel/src/interrupts/interrupts.h

@@ -3,4 +3,6 @@
 
 struct interrupt_frame;
 
-__attribute__((interrupt)) void PageFault_Handler(struct interrupt_frame* 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);

kernel/src/kernel.cpp

@@ -4,8 +4,11 @@ extern "C" void _start(BootInfo* bootInfo) {
 	KernelInfo kernelInfo = InitializeKernel(bootInfo);
 	PageTableManager* pageTableManager = kernelInfo.pageTableManager;
 
+	GlobalRenderer->Clear(0xFF191919);
 	GlobalRenderer->Print("Kernel initialized successfully!");
-	GlobalRenderer->cursorPosition = {0, GlobalRenderer->cursorPosition.y + 18};
+	GlobalRenderer->Next();
+	
+	asm("int $0x0e");
 	
 	// make sure we never return from our OS
 	while (true);

kernel/src/kernelUtil.cpp

@@ -54,6 +54,16 @@ void PrepareInterrupts() {
 	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
+
 	// load idt
 	asm("lidt %0" : : "m" (idtr));
 }

kernel/src/panic.cpp

@@ -0,0 +1,10 @@
+#include "panic.h"
+#include "BasicRenderer.h"
+
+void Panic(const char* panicMessage) {
+	GlobalRenderer->Clear(0xFF000000);
+	GlobalRenderer->Colour = 0xFFFF0000;
+	GlobalRenderer->cursorPosition = {0,0};
+	GlobalRenderer->Print("PANIC!!! ");
+	GlobalRenderer->Print(panicMessage);
+}

kernel/src/panic.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void Panic(const char* panicMessage);