Makefile

@@ -5,7 +5,7 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
 CPP = ${HOME}/opt/cross/bin/i686-elf-g++ 
 CFLAGS =  -ffreestanding -O2 -Wall -Wextra
 
-OFILES =  $(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o  $(BUILD_DIR)/PhysicalMemoryManager.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
+OFILES =  $(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/PhysicalMemoryManager.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
 
 SRC_DIR = src
 BUILD_DIR = build
@@ -23,8 +23,6 @@ all: clean build
 
 build: build_kernel iso
 
-
-
 clean_iso: 
 	if [[ -a isodir/boot ]] ; then rm root/boot -rd ; fi
 	if [ -f build/barinkOS.iso ] ; then rm build/barinkOS.iso ; fi
@@ -36,7 +34,7 @@ iso: clean_iso clean build
 	grub-mkrescue -o build/barinkOS.iso root
 	
 test:
-	$(EMULATOR)  -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std -monitor stdio -display gtk -m 2G -cpu core2duo 
+	$(EMULATOR)  -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std -display gtk -m 2G -cpu core2duo 
 
 build_kernel: $(OBJ_LINK_LIST)
 	$(CC) -T $(SRC_DIR)/kernel//linker.ld -o $(BUILD_DIR)/myos.bin \
@@ -85,3 +83,6 @@ $(BUILD_DIR)/string.o:
 
 $(BUILD_DIR)/PhysicalMemoryManager.o:
 	$(CPP) -c $(SRC_DIR)/kernel/memory/PhysicalMemoryManager.cpp  -o $(BUILD_DIR)/PhysicalMemoryManager.o $(CFLAGS) -fno-exceptions -fno-rtti
+
+$(BUILD_DIR)/pit.o:
+	$(CPP) -c $(SRC_DIR)/kernel/pit.cpp  -o $(BUILD_DIR)/pit.o $(CFLAGS) -fno-exceptions -fno-rtti

src/kernel/boot.S

@@ -21,6 +21,7 @@ stack_bottom:
 stack_top:
  
 .section .text
+.include "./src/kernel/gdt/gdt.s"
 .include "./src/kernel/irs_table.s"
 .include "./src/kernel/irq_table.s"
 .include "./src/kernel/idt/idt.s"
@@ -45,34 +46,21 @@ _start:
 	pushl %eax
 	
 	call early_main
+
+
+	mov %cr0, %eax 
+	or $1, %eax
+	mov %eax, %cr0
+
+	
+	call kernel_main
+
+
 	cli
-	
-	
-
-.include "./src/kernel/gdt/gdt.s"
-
-	loadIDT:
-		#load idt
-		call init_idt
-        sti
-        
-        # Try enable A20
-		# mov $0x2401, %ax
-		# int $0x15
+1:	hlt
+	jmp 1b
 
 
-		# enable protected mode
-		mov %cr0, %eax 
-		or $1, %eax
-		mov %eax, %cr0
-
-		
-		call kernel_main
+.size _start, . - _start
 
 
-		cli
-	1:	hlt
-		jmp 1b
-
-
-.size _start, . - _start

src/kernel/gdt/gdtc.cpp

@@ -29,6 +29,8 @@ void add_descriptor(int which , unsigned long base, unsigned long limit, unsigne
 
 void initGDT(){
 
+      printf("Init GDT!\n");
+
       // NULL segment
       add_descriptor(NULL_SEGMENT, 0,0,0,0);
 
@@ -52,10 +54,4 @@ void initGDT(){
 
       LoadGlobalDescriptorTable();
 
-      while (true)
-         asm volatile("hlt");
-      
-
-
-
 }

src/kernel/idt/idt.cpp

@@ -1,4 +1,5 @@
 #include "idt.h"
+#include "../pit.h"
 //#include "scancodes/set1.h"
 
 IDT_entry idt_table[256];
@@ -24,6 +25,8 @@ void irs_handler (registers regs) {
 
         }
         
+
+    
   
        
 
@@ -32,36 +35,33 @@ void irs_handler (registers regs) {
 
 
 void irq_handler (registers regs) {
-        
-     
-        if ( regs.int_no != 0) {
-            kterm_writestring("received interrupt!\n");
-            printf("(IRQ) Interrupt number: %d \n", regs.int_no);
-        
-        }
-        
-        if ( regs.int_no == 1 ){
+
+        switch (regs.int_no)
+        {
+        case 0:
+             pit_tick++;
+            break;
+        case 1:
             // Keyboard interrupt !!
 
             int scan;
             /*register*/int i;
 
             // Read scancode 
-
             scan = inb(0x60);
             
             // Send ack message!
             i = inb(0x61);
             outb(0x61, i|0x80);
             outb(0x61, i);
-            kterm_writestring("A key was pressed/released\n");
             printf( "Scancode: %x\n", scan);
+            break;    
 
-    
-        }
+        default:
+            printf("Received INT: 0x%x\n", regs.int_no);
+            break;
+        }        
 
-        
-        
         outb(0x20, 0x20); // send end of interrupt to master
 
         if ( regs.int_no > 8 && regs.int_no <= 15) {
@@ -76,16 +76,13 @@ void irq_handler (registers regs) {
 
 }
 
-
-
-
-
 void init_idt(){
     // Initialise the IDT pointer
     idt_ptr.length = sizeof(IDT_entry) * 255;
     idt_ptr.base = (uint32_t)&idt_table;
 
-
+    printf("Init IDT\n");
+    
     // TODO: Set everything to zero first
 
     set_id_entry(0,  (uint32_t) irs0 , 0x08, 0x8F);

src/kernel/io.cpp

@@ -22,7 +22,7 @@ unsigned int inl_p(unsigned short ){
 }
 
 
-void outb_p(unsigned char , unsigned short ){
+void b_p(unsigned char , unsigned short ){
 
 }
 void outw(unsigned short , unsigned short ){

src/kernel/kernel.cpp

@@ -1,6 +1,8 @@
 #include "kernel.h"
-#define GB4 524288
 #define GB2 262144
+
+ extern "C" void kernel_main (void);
+  
     extern "C" void early_main(unsigned long magic, unsigned long addr){
         /** initialize terminal interface */ 
         kterm_init();
@@ -27,19 +29,30 @@
         }
 
         initGDT();
+        init_idt();
+        // Enable interrupts
+        asm volatile("STI");
+        
 
+        kernel_main();
        
     }
 
     extern "C" void kernel_main (void) {
 
-        printf("call to init serial\n");
+   
         init_serial();
 
+
+
+        pit_initialise();
+      
+
+
         while (true){
             //Read time indefinetely 
             read_rtc();
-            printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d  [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
+            printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d (Ticks: %06d)  [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second, pit_tick);
             delay(1000);
         }
             

src/kernel/kernel.h

@@ -12,6 +12,7 @@ extern "C"{
 #include "gdt/gdtc.h"
 #include "idt/idt.h"
 
+#include "pit.h"
 #include "io.h"
 #include "time.h"
 #include "cpu.h"

src/kernel/pit.cpp

@@ -0,0 +1,53 @@
+#include "pit.h"
+#include "tty/kterm.h"
+uint32_t pit_tick = 0;
+
+
+void pit_initialise()
+{
+    asm volatile("CLI");
+
+    printf("init PIT!\n");
+
+    // clear mask for IRQ 0 
+    uint8_t value = inb(0x21) & ~(1<< 0);
+    outb(0x21, value);
+
+    io_wait();
+
+    const int freq = 500;
+
+    uint32_t divisor = 1193180 / freq;
+
+    outb(PIT_COMMAND, 0x36);
+
+    uint8_t l = (uint8_t) (divisor & 0xFF);
+    uint8_t h = (uint8_t) ( (divisor>>8) & 0xff);
+
+    outb(PIT_DATA_0, l);
+    outb(PIT_DATA_0,h);
+
+
+    asm volatile("STI");
+}
+
+
+void get_pit_count()
+{
+    asm volatile ("CLI");
+
+    outb(PIT_COMMAND, 0);
+    uint16_t count = inb(PIT_DATA_0);
+    count |= inb(PIT_DATA_0) << 8;
+
+    printf("PIT count: 0x%x\n", count); 
+
+    asm volatile("STI");   
+
+}
+
+void set_pit_count()
+{
+
+}
+

src/kernel/pit.h

@@ -0,0 +1,18 @@
+#pragma once 
+#include <stdint.h>
+#include "io.h"
+#define PIT_DATA_0 0x40
+#define PIT_DATA_1 0x41
+#define PIT_DATA_2 0x42
+#define PIT_COMMAND 0x43
+
+
+extern uint32_t pit_tick;
+
+
+void pit_initialise();
+
+
+void get_pit_count();
+
+void set_pit_count();

src/kernel/serial.h

@@ -4,6 +4,7 @@
 #include "io.h"
 #define PORT 0x3f8 
 static int init_serial() {
+   printf("Init serial\n");
    outb(PORT + 1, 0x00);    // Disable all interrupts
    outb(PORT + 3, 0x80);    // Enable DLAB (set baud rate divisor)
    outb(PORT + 0, 0x03);    // Set divisor to 3 (lo byte) 38400 baud