CTAOS v5

SysCore/hal/gdt/gdt.c

@@ -2,7 +2,7 @@
  *    gdt.c  -  GLOBAL DESCRIPTOR TABLE                           *
  *      Contains function prototypes for setting up the GDT       *
  ******************************************************************/
-#define MAX_DESCRIPTORS 3
+#define MAX_DESCRIPTORS 5
 #include "gdt.h"
 
 /* Our GDT, with 3 entries, and finally our special GDT pointer */
@@ -59,6 +59,12 @@ void i86_gdt_install()
     *  this entry's access byte says it's a Data Segment */
     i86_gdt_set_gate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
 
+    /* User mode Code segment*/
+    i86_gdt_set_gate(3, 0, 0xFFFFFFFF, 0xFA, 0xCF);
+    
+    /* User mode data segment*/
+    i86_gdt_set_gate(4, 0, 0xFFFFFFFF, 0xF2, 0xCF);
+
     /* Flush out the old GDT and install the new changes! */
     i86_gdt_flush();
 }