Added the current timer tick as a global variable.

Added a beep function to allow PC Speaker output.
This will require an edit to the current QEMU launchscript to get working.

.gitignore

@@ -57,3 +57,9 @@ Mkfile.old
 dkms.conf
 
 # End of https://www.gitignore.io/api/c
+/.vs
+/Sync-OS
+/Sync-OS.sln
+/Sync-OS.vcxproj
+/Sync-OS.vcxproj.user
+/Sync-OS.vcxproj.filters

include/kernel.h

@@ -686,6 +686,8 @@ void ScanCPUFeatures(size_t RAX, size_t RCX);
 
 /*  ==================== Interrupts ==================== */
 
+uint64_t time;
+
 void IRQ_Common(INTERRUPT_FRAME* Frame, size_t Interupt);
 void ISR_Common(INTERRUPT_FRAME* Frame, size_t Interrupt);
 void ISR_Error_Common(EXCEPTION_FRAME* Frame, size_t Exception);

kernel/bootstrap.c

@@ -44,12 +44,20 @@ void PrepareSystem(FILELOADER_PARAMS* FLOP) {
     Memory_Info.MemoryMapDescriptorSize = FLOP->MemoryMapDescriptorSize;
     Memory_Info.MemoryMapDescriptorVersion = FLOP->MemoryMapDescriptorVersion;
 
+
+    SetupPrinting(FLOP->GPU_Info->GPUs[0]);
+    /* All print functions are now available. */
+    printf("ready!");
+    
+    InstallGDT();
+    InstallIDT();
+
+	beep();
+
     if(SetIdentityMap(FLOP->RTServices) == NULL) {
         Memory_Info.MemoryMap = FLOP->MemoryMap;
     }
 
-    SetupPrinting(FLOP->GPU_Info->GPUs[0]);
-    /* All print functions are now available. */
 
     PrepareAVX();
 
@@ -90,8 +98,6 @@ void PrepareSystem(FILELOADER_PARAMS* FLOP) {
     }
 
     // Set up memory management
-    InstallGDT();
-    InstallIDT();
     InstallMemoryMap();
     InstallPaging();
 
@@ -104,6 +110,54 @@ void PrepareSystem(FILELOADER_PARAMS* FLOP) {
 
 }
 
+
+/*
+ *	Following section is taken from the OSDev Wiki page on PC Speaker.
+ *  This is beeped first, before *anything* else.
+ *  This way, we know that at least *something* works.
+ */
+
+ //Play sound using built in speaker
+ static void play_sound(uint32_t nFrequence) {
+ 	uint32_t Div;
+ 	uint8_t tmp;
+ 
+        //Set the PIT to the desired frequency
+ 	Div = 1193180 / nFrequence;
+ 	WritePort(0x0043, 0xb6, 1);
+ 	WritePort(0x0042, (uint8_t) (Div), 1);
+ 	WritePort(0x0042, (uint8_t) (Div >> 8), 1);
+ 
+        //And play the sound using the PC speaker
+ 	tmp = ReadPort(0x0061, 1);
+  	if (tmp != (tmp | 3)) {
+ 		WritePort(0x0061, tmp | 3, 1);
+ 	}
+ }
+ 
+ //make it shutup
+ static void nosound() {
+ 	uint8_t tmp = ReadPort(0x0061, 1) & 0xFC;
+ 
+ 	WritePort(0x0061, tmp, 1);
+ }
+ 
+ //Make a beep
+ void beep() {
+ 	 play_sound(1000);
+ 	 timer_wait(10);
+ 	 nosound();
+          //set_PIT_2(old_frequency);
+ }
+
+
+void timer_wait(int ticks){
+    uint64_t FinalTick = time + ticks;
+
+    while(time < FinalTick);
+}
+
+
 /* A temporary system for keeping track of system performance. */
 
 size_t ClockTick() {

kernel/interrupts.c

@@ -50,6 +50,7 @@ void ISR_Common(INTERRUPT_FRAME* Frame, size_t Exception) {
 	if(Exception < 32) {
 		/* exception_messages is an array of c-strings defined in kernel.h */
 		// TODO: Serial!
+		
 		//serial_print(0x3F8, exception_messages[Exception]);
 		//serial_print(0x3F8, " Exception.\r\n");
 		printf("%s exception!", ExceptionStrings[Exception]);
@@ -89,26 +90,26 @@ void IRQ_Common(INTERRUPT_FRAME* Frame, size_t Interrupt) {
 	
 	/* The Slave PIC must be told it's been read in order to receive another 8+ IRQ. */
 	if(Interrupt > 7)
-		WritePort(0xA0, 0x20, 8);
+		WritePort(0xA0, 0x20, 1);
 	
 	/* In either case, we tell the Master PIC it's been read to receive any IRQ. */
-	WritePort(0x20, 0x20, 8);
+	WritePort(0x20, 0x20, 1);
 }
 
 /* However, in order to actually be able to receive IRQs, we need to remap the PICs. */
 void RemapIRQControllers() {
 	/* 0x20 is the Master PIC,
 	   0xA0 is the Slave PIC. */
-	WritePort(0x20, 0x11, 8);
+	WritePort(0x20, 0x11, 1);
-	WritePort(0xA0, 0x11, 8);
+	WritePort(0xA0, 0x11, 1);
-	WritePort(0x21, 0x20, 8);
+	WritePort(0x21, 0x20, 1);
-	WritePort(0xA1, 0x28, 8);
+	WritePort(0xA1, 0x28, 1);
-	WritePort(0x21, 0x04, 8);
+	WritePort(0x21, 0x04, 1);
-	WritePort(0xA1, 0x02, 8);
+	WritePort(0xA1, 0x02, 1);
-	WritePort(0x21, 0x01, 8);
+	WritePort(0x21, 0x01, 1);
-	WritePort(0xA1, 0x01, 8);
+	WritePort(0xA1, 0x01, 1);
-	WritePort(0x21, 0x0, 8);
+	WritePort(0x21, 0x0, 1);
-	WritePort(0xA1, 0x0, 8);
+	WritePort(0xA1, 0x0, 1);
 }
 
 /* In order to actually handle the IRQs, though, we need to tell the kernel *where* the handlers are. */
@@ -150,6 +151,11 @@ void UninstallIRQHandler(int IRQ) {
  */
 
 __attribute__((interrupt)) void ISR0Handler(INTERRUPT_FRAME* Frame) {
+	// This baby is the timer.
+	// TODO: Change ISR0Handler to TimerHandler.
+	// Here, we can do some timer related stuff.
+	// For starts, we just tick a timer that tells us how long the program has been running.
+	time++;
 	ISR_Common(Frame, 0);
 }
 __attribute__((interrupt)) void ISR1Handler(INTERRUPT_FRAME* Frame) {