Move tests to their own file

src/kern.c

@@ -8,6 +8,7 @@
 #include "mem.h"
 #include "gdt.h"
 #include "idt.h"
+#include "test.h"
 
 #if defined(__cplusplus)
 extern "C" /* Use C linkage for kernel_main. */
@@ -37,10 +38,9 @@ void kernel_main()
     enablePaging();
 
     serial_writestring("Finished Initilizing memory\n");
-    asm ("int $0x80");
-    asm ("int $0x90");
     int o=0;
     int j=5/o;
     serial_hexword(j);
-    asm ("hlt");
+    test_mem();
+    test_idt();
 }

src/mem.c

@@ -28,6 +28,10 @@ page_directory_entry* initiate_directory()
         page_directory[i] |= PAGE_WRITABLE;
     }
 
+    // Set last directory entry to point back
+    page_directory[1023] = (uint32_t) page_directory;
+    page_directory[1023] |= PAGE_WRITABLE | PAGE_PRESENT;
+
     return page_directory;
 }
 

src/test.c

+/*
+  test.c implements functions used for testing
+*/
+
+#include "test.h"
+
+void test_idt()
+{
+    asm ("int $0x80");
+    asm ("int $0x90");
+    asm ("hlt");
+}
+
+void test_mem()
+{
+    // try writing a bunch of bytes starting at 0
+    int i = 0x0;
+    for(i=0; i < 0x4000; i++)
+    {
+        *(int*)(i<<2) = i;
+        serial_writestring("wrote 0x");
+        serial_hexstring(&i, 4);
+        serial_writestring("\n");
+
+    }
+
+    // read it back in and make sure its all stored
+
+    for (i=0; i < 0x4000; i++)
+    {
+        if (*(int*)(i<<2) != i)
+        {
+            serial_writestring("Memory error\n");
+        }
+    }
+
+    serial_writestring("Wrote a bunch of memory\n");
+}

src/test.h

+/*
+  test.h defines functions used for testing
+ */
+
+#ifndef INC_TEST
+#define INC_TEST
+
+#include "serial.h"
+
+// test_idt calls a couple of interrupts. Should be done after kernel
+// has been set up
+void test_idt();
+
+// test_mem writes some stuff to moem
+void test_mem();
+
+#endif