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)/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
+OFILES =  $(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/pit.o $(BUILD_DIR)/keyboard.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
@@ -86,3 +86,7 @@ $(BUILD_DIR)/PhysicalMemoryManager.o:
 
 $(BUILD_DIR)/pit.o:
 	$(CPP) -c $(SRC_DIR)/kernel/pit.cpp  -o $(BUILD_DIR)/pit.o $(CFLAGS) -fno-exceptions -fno-rtti
+
+
+$(BUILD_DIR)/keyboard.o:
+	$(CPP) -c $(SRC_DIR)/kernel/keyboard/keyboard.cpp  -o $(BUILD_DIR)/keyboard.o $(CFLAGS) -fno-exceptions -fno-rtti

src/kernel/idt/idt.cpp

@@ -1,6 +1,6 @@
 #include "idt.h"
 #include "../pit.h"
-//#include "scancodes/set1.h"
+#include "../keyboard/keyboard.h"
 
 IDT_entry idt_table[256];
 IDT_ptr idt_ptr;
@@ -14,7 +14,6 @@ void set_id_entry (uint8_t num , uint32_t base, uint16_t sel,  uint8_t flags){
 
 };
 
-
 void irs_handler (registers regs) {
         kterm_writestring("received interrupt!\n");
      
@@ -36,8 +35,9 @@ void irs_handler (registers regs) {
 
 void irq_handler (registers regs) {
 
-        switch (regs.int_no)
-        {
+    
+
+    switch (regs.int_no) {
     case 0:
             pit_tick++;
         break;
@@ -45,7 +45,7 @@ void irq_handler (registers regs) {
         // Keyboard interrupt !!
 
         int scan;
-            /*register*/int i;
+        int i;/*register*/
 
         // Read scancode 
         scan = inb(0x60);
@@ -54,10 +54,26 @@ void irq_handler (registers regs) {
         i = inb(0x61);
         outb(0x61, i|0x80);
         outb(0x61, i);
-            printf( "Scancode: %x\n", scan);
+
+        // NOTE: check for special scan codes 
+        // e.g. modifiers etc..
+        if( scan < 0x37){
+            //printf("Read from IO: 0x%x\n", scan);
+            keyPress.ScanCode = scan ;
+            //printf( "[From Interrupt] Scancode: %x\n", keyPress.ScanCode);
+
+        }
+
+        
+        break;    
+    case 12:
+        // PS2 Mouse interrupt 
+        printf("Mouse event triggered!");
+        //int event = inb(0x60);
         break;
 
     default:
+        printf("Interrupt happened!");
         printf("Received INT: 0x%x\n", regs.int_no);
         break;
     }        
@@ -122,10 +138,15 @@ void init_idt(){
     //print_serial("Remapping PIC\n");
     PIC_remap(0x20, 0x28);
 
+    // clear mask for IRQ 12
+    uint8_t value = inb(0x21) & ~(1<< 12);
+    outb(0x21, value);
+
+
 
     // pic IRQ Table
     set_id_entry(32, (uint32_t)irq0, 0x08, 0x8E);
-    set_id_entry(33, (uint32_t)irq1, 0x08, 0x8E);
+    set_id_entry(33, (uint32_t)irq1, 0x08, 0x8E); // PS2 Keyboard
     set_id_entry(34, (uint32_t)irq2, 0x08, 0x8E);
     set_id_entry(35, (uint32_t)irq3, 0x08, 0x8E);
     set_id_entry(36, (uint32_t)irq4, 0x08, 0x8E);
@@ -136,7 +157,7 @@ void init_idt(){
     set_id_entry(41, (uint32_t)irq9, 0x08, 0x8E);
     set_id_entry(42, (uint32_t)irq10, 0x08, 0x8E);
     set_id_entry(43, (uint32_t)irq11, 0x08, 0x8E);
-    set_id_entry(44, (uint32_t)irq12, 0x08, 0x8E);
+    set_id_entry(44, (uint32_t)irq12, 0x08, 0x8E); // PS2 Mouse
     set_id_entry(45, (uint32_t)irq13, 0x08, 0x8E);
     set_id_entry(46, (uint32_t)irq14, 0x08, 0x8E);
     set_id_entry(47, (uint32_t)irq15, 0x08, 0x8E);

src/kernel/kernel.cpp

@@ -7,13 +7,12 @@
         /** initialize terminal interface */ 
         kterm_init();
         
+        // Check Multiboot magic number 
         if (magic != MULTIBOOT_BOOTLOADER_MAGIC){
             printf("Invalid magic number: 0x%x\n",  magic);
             return;
         }
 
-        CheckMBT(  (multiboot_info_t *) addr);
-
         multiboot_info_t* mbt = (multiboot_info_t*) addr;
 
         /* Are mmap_* valid? */
@@ -26,6 +25,7 @@
 
             printf("Kernel MemoryMap:\n");
             printf("kernel: 0x%x - 0x%x\n", &kernel_begin , &kernel_end);         
+            printf("Frames used: 0x%x blocks of 4 KiB\n", used_blocks); 
         }
         
         initGDT();
@@ -34,25 +34,53 @@
         asm volatile("STI");
         
 
+        CheckMBT(  (multiboot_info_t *) addr);
+
+
         kernel_main();
        
     }
 
     extern "C" void kernel_main (void) {
-
-   
         init_serial();
-
-
-
         pit_initialise();
 
-
-
         while (true){
-            //Read time indefinetely 
+           
+           printf("SUPERVISOR:>$ " );
+            int characterCount = 0;
+            char command[10] = "";
+         
+            // NOTE: lets just show a kernel prompt                
+            uint8_t ScanCode = getKey();
+            while( ScanCode  != 0x1C )
+            {
+                char character = getASCIIKey();
+                kterm_put(character );
+                // wHAT THE HELL
+
+                if( characterCount  < 10 ){
+                    command[characterCount] = character;  
+                    characterCount++;
+                }
+
+                ScanCode = getKey(); 
+            }
+            printf("\n");
+            KeyHandled();
+         
+
+            if ( strncmp("TIME", command , characterCount ) == 0 ) {
                  read_rtc();
-            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);
+                 printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d (Ticks: %06d)\n" ,year, month, day, hour, minute, second, pit_tick);            
+            } else if(strncmp("TEST", command, characterCount) == 0){
+               // asm volatile ("MOV $4, %AX ;  MOV $0, %BX ; DIV %BX"); // IRS 0
+            }
+            else{
+                printf("Unknown command\n");
+            }
+
+
             delay(1000);
         }   
 

src/kernel/kernel.h

@@ -12,6 +12,8 @@ extern "C"{
 #include "gdt/gdtc.h"
 #include "idt/idt.h"
 
+#include "keyboard/keyboard.h"
+
 #include "pit.h"
 #include "io.h"
 #include "time.h"

src/kernel/keyboard/keyboard.cpp

@@ -0,0 +1,51 @@
+#include "keyboard.h"
+
+KeyPressInfo keyPress {};
+
+void KeyHandled(){
+    keyPress.ScanCode= 0x00;
+    keyPress.PressedModifiers = 0x00;
+}
+
+
+char getASCIIKey(){
+    char keyPressed;
+    // Wait until a key is pressed  
+    while(keyPress.ScanCode == 0x00) {
+        asm volatile ("NOP");
+    }
+
+    
+    // Translate keycode to ascii 
+    // Probably a lookup table might be handy 
+    // Until 0x37
+     const char* ASCIILookUp =
+      "\01234567890-=\0\0QWERTYUIOP[]\0\0ASDFGHJKL;\'`\0\\ZXCVBNM,./\0"; 
+     
+     uint8_t ASCII_Index = keyPress.ScanCode - 3  ;
+     //printf("ASCII_INDEX: %x\n", ASCII_Index);
+     keyPressed = ASCIILookUp[ASCII_Index];
+
+    KeyHandled();
+
+    return keyPressed;
+}
+
+
+
+uint8_t getKey(){
+    // Wait until a key is pressed 
+    while(keyPress.ScanCode == 0x00){
+        asm volatile ("NOP");
+    }
+    
+    if( keyPress.ScanCode > 0x37){
+        keyPress.ScanCode = 0x00;
+        return 0;
+    }
+
+    uint8_t ScanCode = keyPress.ScanCode;
+   // KeyHandled();
+
+    return  ScanCode ;
+}

src/kernel/keyboard/keyboard.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <stdint.h>
+#include "../tty/kterm.h"
+typedef enum ScanCodeSet{
+    None            =   0,
+    ScanCodeSet1    =   1,
+    ScanCodeSet2    =   2,
+    ScanCodeSet3    =   3,
+};
+
+typedef enum Modifiers{
+    LSHIFT  =   1,
+    RSHIFT  =   2,
+
+    LCTRL   =   3,
+    RCTRL   =   4,
+
+    LALT    =   5,
+    RALT    =   6
+};
+
+struct KeyPressInfo{ 
+    uint8_t PressedModifiers;
+    uint8_t ScanCode;
+};
+
+
+
+extern KeyPressInfo keyPress;
+
+void KeyHandled();
+
+char getASCIIKey();
+uint8_t getKey();

src/libc/include/string.c

@@ -7,3 +7,22 @@ size_t strlen(const char* str) {
     }
     return len;
 }
+
+
+
+int strncmp ( const char* str1, const char* str2, size_t num ){
+    for( int i = 0; i < num ; i++){
+        
+        if( str1[i] < str2[i]){
+            return -1;
+        } 
+
+        if( str1[i] > str2[i] ){
+            return 1;
+        }
+
+
+    }
+
+    return 0;
+}

src/libc/include/string.h

@@ -1,3 +1,6 @@
 #pragma once
 #include <stddef.h>
 size_t strlen(const char* str);
+
+
+int strncmp ( const char* str1, const char* str2, size_t num );