did some restructuring, got multitasking almost working

kernel/lib/print.c

@@ -1,20 +1,25 @@
 #include "print.h"
 #include "stream.h"
+#include "tasks.h"
+
 #include <stdarg.h>
 
-extern print_stream_t* kout;
+#include <drivers/vga/vga.h>
+
+spinlock_t kwrite_lock = {0};
+
 static char* hex_chars = "0123456789abcdef";
 
 static void kprint(const char *str) {
     while (*str) {
-        kout->putchar(*str);
+        vga_putchar(*str);
         str++;
     }
 }
 
 static void kputd(int d) {
     if (d == 0) {
-        kout->putchar('0');
+        vga_putchar('0');
         return;
     }
     char buffer[12];
@@ -24,13 +29,13 @@ static void kputd(int d) {
         d /= 10;
     }
     for (int j = i - 1; j >= 0; j--) {
-        kout->putchar(buffer[j]);
+        vga_putchar(buffer[j]);
     }
 }
 
 static void kputx(unsigned int x) {
     if (x == 0) {
-        kout->putchar('0');
+        vga_putchar('0');
         return;
     }
     char buffer[8];
@@ -41,15 +46,18 @@ static void kputx(unsigned int x) {
         x >>= 4;
     }
     for (int j = i - 1; j >= 0; j--) {
-        kout->putchar(buffer[j]);
+        vga_putchar(buffer[j]);
     }
 }
 
 void kputc(const char c) {
-    kout->putchar(c);
+    spin_lock(&kwrite_lock);
+    vga_putchar(c);
+    spin_unlock(&kwrite_lock);
 }
 
 void kprintf(const char* fmt, ...) {
+    spin_lock(&kwrite_lock);
     va_list args;
     va_start(args, fmt);
     
@@ -73,19 +81,20 @@ void kprintf(const char* fmt, ...) {
                     break;
                 }
                 case '%':
-                    kout->putchar('%');
+                    vga_putchar('%');
                     break;
                 default:
-                    kout->putchar('%');
-                    kout->putchar(*fmt);
+                    vga_putchar('%');
+                    vga_putchar(*fmt);
                     break;
             }
             fmt++;
         } else {
-            kout->putchar(*fmt);
+            vga_putchar(*fmt);
             fmt++;
         }
     }
     
     va_end(args);
+    spin_unlock(&kwrite_lock);
 }