Added debug_printf()

The debug_printf() function works just as any printf-like function. It prints to the serial port using ANSI coloring. Also, debug_vprintf() was implemented, which takes arguments as a va_list instead of as variadic arguments.

src/kernel/drivers/keyboard.c

@@ -6,6 +6,7 @@
 #include "../arch/i686/io.h"
 #include "../lib/stdio.h"
 #include "../shell.h"
+#include "../lib/debug.h"
 
 static bool g_caps_lock = false;
 static bool g_shift = false;
@@ -58,5 +59,6 @@ static void keyboard_callback(){
 }
 
 void keyboard_initialize(){
+    debug_printf("[KEYBOARD] Initializing keyboard\n");
     i686_isr_register_handler(IRQ(1), keyboard_callback);
 }

src/kernel/drivers/timer.c

@@ -1,11 +1,13 @@
 #include "timer.h"
 #include "../arch/i686/isr.h"
 #include "../lib/stdio.h"
+#include "../lib/debug.h"
 
 static void timer_handler(registers *regs){
     //printf("TICK\n");
 }
 
 void timer_initialize(){
+    debug_printf("[TIMER] Initializing PIT\n");
     i686_isr_register_handler(IRQ(0), timer_handler);
 }

src/kernel/lib/debug.c

@@ -0,0 +1,14 @@
+#include "debug.h"
+#include "stdio.h"
+
+void debug_printf(char *fmt, ...){
+    va_list args;
+    va_start(args, fmt);
+    debug_vprintf(fmt, args);
+}
+
+void debug_vprintf(char *fmt, va_list args){
+    serial_printf("\x1b[34m");
+    serial_vprintf(fmt, args);
+    serial_printf("\x1b[0m");
+}

src/kernel/lib/debug.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdarg.h>
+
+void debug_printf(char *fmt, ...);
+void debug_vprintf(char *fmt, va_list args);

src/kernel/lib/stdio.c

@@ -119,7 +119,7 @@ void printf(char *fmt, ...){
 }
 
 void serial_vprintf(char *fmt, va_list args){
-    _vprintf(putc, fmt, args);
+    _vprintf(serial_putc, fmt, args);
 }
 
 void serial_printf(char *fmt, ...){

src/kernel/lib/stdio.h

@@ -1,6 +1,12 @@
 #pragma once
 
+#include <stdarg.h>
+
 void puts(char *str);
 void putc(char c);
+void serial_putc(char c);
+void vprintf(char *fmt, va_list args);
 void printf(char *fmt, ...);
+void serial_vprintf(char *fmt, va_list args);
+void serial_printf(char *fmt, ...);
 void clear_screen();

src/kernel/main.c

@@ -8,6 +8,7 @@
 #include "arch/i686/mm/pmm.h"
 #include "arch/i686/mm/vmm.h"
 #include "multiboot.h"
+#include "lib/debug.h"
 
 extern uint8_t end; // Kernel end
 
@@ -21,6 +22,10 @@ void __attribute__((cdecl)) kmain(multiboot_info_t *multiboot_info){
     // Initialize serial
     uart_initialize(COM1, 2);
 
+    // Initialize drivers
+    timer_initialize();
+    keyboard_initialize();
+
     // Initialize physical memory manager
     uint32_t mem_size = 1024 + multiboot_info->mem_lower + multiboot_info->mem_upper*64;
 
@@ -28,7 +33,7 @@ void __attribute__((cdecl)) kmain(multiboot_info_t *multiboot_info){
 
     for(int i = 0; i < multiboot_info->mmap_length; i += sizeof(multiboot_memory_map_t)){
         multiboot_memory_map_t *memory_map = (multiboot_memory_map_t *)(multiboot_info->mmap_addr + i);
-        serial_printf("Start Addr: 0x%x%x | Length: 0x%x%x | Size: 0x%x | Type: %i\n", memory_map->addr_h, memory_map->addr_l, memory_map->len_h, memory_map->len_l, memory_map->size, memory_map->type);
+        debug_printf("Start Addr: 0x%x%x | Length: 0x%x%x | Size: 0x%x | Type: %i\n", memory_map->addr_h, memory_map->addr_l, memory_map->len_h, memory_map->len_l, memory_map->size, memory_map->type);
     
         if(memory_map->type == 1){
             i686_pmm_init_region(memory_map->addr_l, memory_map->len_l);
@@ -39,10 +44,6 @@ void __attribute__((cdecl)) kmain(multiboot_info_t *multiboot_info){
 
     // Initialize virtual memory
     i686_vmm_initialize();
-
-    // Initialize drivers
-    timer_initialize();
-    keyboard_initialize();
     
     // Initialize FS
     vfs_initialize();

src/kernel/shell.c

@@ -2,7 +2,6 @@
 #include "lib/stdio.h"
 #include "lib/string.h"
 #include "lib/memory.h"
-#include "drivers/uart.h"
 
 int shell_run(char *cmd){
     int ret = 0;
@@ -17,22 +16,8 @@ int shell_run(char *cmd){
     else if(!strcmp(cmd, "clear")){
         clear_screen();
     }
-    else if(!strcmp(cmd, "uart")){
-        uart_write(COM1, '\x1b');
-        uart_write(COM1, '[');
-        uart_write(COM1, '3');
-        uart_write(COM1, '2');
-        uart_write(COM1, 'm');
-        uart_write(COM1, 'H');
-        uart_write(COM1, 'E');
-        uart_write(COM1, 'L');
-        uart_write(COM1, 'L');
-        uart_write(COM1, 'O');
-        uart_write(COM1, '\n');
-        uart_write(COM1, '\x1b');
-        uart_write(COM1, '[');
-        uart_write(COM1, '0');
-        uart_write(COM1, 'm');
+    else if(!strcmp(cmd, "serial")){
+        serial_printf("Hello world!\n");
     }
     else{
         printf("SHELL: Unknown command \"%s\"\n", cmd);