* Added function to print cpuinfo

* Added driver for PIT
* Added driver for serialport
* Added driver for keyboard
* Implemented a basic shell
* Added a function sysfetch which will fetch and print info about the os
* Updated Makefile
* Bumped kernel version to 1.2.0
* Updated bochsrc
* updated Interrupt.c

Author: Arun007coder

docs/bochsrc

@@ -1,9 +1,9 @@
 megs: 32
-romimage: file=/usr/share/bochs/BIOS-bochs-latest, address=0xf0000
-vgaromimage: /usr/share/bochs/VGABIOS-elpin-2.40
-floppya: 1_44=/dev/loop0, status=inserted
-boot: a
+ata0-slave: type=cdrom, path=SectorOS_RE2.iso, status=inserted
+com1: enabled=1, mode=file, dev=serial.log
+speaker: enabled=1, mode=sound
 log: bochsout.txt
+boot: cdrom
 mouse: enabled=0
 clock: sync=realtime
-cpu: ips=500000
+cpu: ips=5000000

src/Include/idt.h

@@ -20,6 +20,6 @@ typedef struct {
 
 
 void init_idt();
-void idt_set_gate(uint8_t num, uint32_t base, uint16_t selector, uint8_t flags);
+void set_idt_gate(uint8_t num, uint32_t base, uint16_t selector, uint8_t flags);
 
 #endif

src/Include/isr.h

@@ -3,10 +3,15 @@
 
 #include "system.h"
 
-typedef void (*isr_t)(registers_t *);
+typedef void (*isr_t)(registers_t);
 extern isr_t interrupt_handlers[256];
 
 void register_interrupt_handler(int num, isr_t handler);
+void enable_interrupts();
+void disable_interrupts();
+
+#define IRQ_BASE 0x20
+#define IRQ(n) (IRQ_BASE + n)
 
 
 // Pointer to the Interrupts in idt_helper.asm

src/Include/keyboard.h

@@ -0,0 +1,18 @@
+#ifndef __KEYBOARD_H__
+#define __KEYBOARD_H__
+
+#include "system.h"
+#include "string.h"
+#include "port.h"
+#include "printf.h"
+#include "isr.h"
+
+#define KEYBOARD_COMMAND_PORT 0x64
+#define KEYBOARD_DATA_PORT 0x60
+
+typedef void (*keyboard_handler_t)(uint8_t);
+
+void init_keyboard(keyboard_handler_t handler);
+void keyboard_callback(registers_t regs);
+
+#endif

src/Include/pic.h

@@ -16,7 +16,7 @@
 // PIC command
 #define PIC_EOI      0x20
 
-void pic_init();
+void init_pic();
 void pic_eoi(unsigned char irq);
 
 #endif

src/Include/pit.h

@@ -0,0 +1,22 @@
+#ifndef __PIT_H
+#define __PIT_H
+
+#include "system.h"
+#include "port.h"
+#include "isr.h"
+#include "printf.h"
+
+#define PIT_FREQUENCY 1193180
+#define PIT_CHANNEL0 0x40
+#define PIT_CHANNEL1 0x41
+#define PIT_CHANNEL2 0x42
+#define PIT_COMMAND 0x43
+
+typedef void (*PIT_CALLBACK)(void);
+
+void init_pit(uint32_t frequency, isr_t callback);
+void chfreq(uint32_t freq);
+void wait(uint32_t ms);
+void register_function(PIT_CALLBACK callback);
+
+#endif

src/Include/serial.h

@@ -0,0 +1,20 @@
+#ifndef __SERIAL_H
+#define __SERIAL_H
+
+#include "system.h"
+#include "printf.h"
+#include "port.h"
+#include "pit.h"
+
+#define COM1 0x3F8
+#define COM2 0x2F8
+#define COM3 0x3E8
+#define COM4 0x2E8
+
+void init_serial(uint16_t port);
+void serial_putc(char c);
+void serial_puts(char *str);
+char serial_getc();
+void serial_printf(char *fmt, ...);
+
+#endif

src/Include/shell.h

@@ -0,0 +1,14 @@
+#ifndef __SHELL_H__
+#define __SHELL_H__
+
+#include "system.h"
+#include "printf.h"
+#include "string.h"
+#include "vga.h"
+#include "serial.h"
+
+#define SHELL_BUFFER_SIZE 256
+
+void shell_run(uint8_t);
+
+#endif

src/Include/system.h

@@ -4,15 +4,26 @@
 #include <stdint.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdbool.h>
 #include "string.h"
+#include "multiboot.h"
 
 #define KB 1024
 #define MB (1024*KB)
 #define GB (1024*MB)
 
+#define MSECOND 1
+#define SECOND 1000*MSECOND
+#define MINUTE 60*SECOND
+#define HOUR 60*MINUTE
+
 #define HALT asm("cli"); asm("hlt");
 #define ASSERT(x) if(!(x)) { \
+    printf("Assertion failed: %s, %s, %d\n", #x, __FILE__, __LINE__); \
+    HALT; \
+}
 
+#define CPUID(in, a, b, c, d) __asm__("cpuid": "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "a"(in));
 #ifndef KERNEL_BUILD
 #define KERNEL_BUILD "2022-01-01"
 #endif
@@ -22,13 +33,16 @@
 #endif
 
 extern uint32_t end;
+extern uint32_t mboot_addr;
 
 #define KERNEL_BASE 0x100000
 #define KERNEL_END  end
 
-#define KERNEL_VERSION "1.0.3"
+#define KERNEL_VERSION "1.2.0"
 #define KERNEL_NAME "SectorOS-RE2"
 
+void print_cpuinfo();
+
 typedef struct CPUSTATE
 {
     uint32_t eax;

src/Interrupt/exception.c

@@ -41,7 +41,7 @@ char* exception_messages[] =
 
 void exception_handler(registers_t cps)
 {
-    if(cps.ino < 32)
+    if(cps.ino < IRQ_BASE)
     {
         change_color(VGA_COLOR_RED, VGA_COLOR_BLACK);
         printf("KERNEL PANIC. EXCEPTION %d: %s\n", cps.ino, exception_messages[cps.ino]);
@@ -65,7 +65,7 @@ void exception_handler(registers_t cps)
     if(interrupt_handlers[cps.ino] != 0)
     {
         isr_t handler = interrupt_handlers[cps.ino];
-        handler(&cps);
+        handler(cps);
     }
     else
     {