Added privilidges

task.h

@@ -27,11 +27,28 @@
 
 typedef enum {
     TASK_STATE_FREE = 0,       /* PCB slot is unused                  */
-    TASK_STATE_READY,          /* runnable, waiting to be scheduled    */
-    TASK_STATE_RUNNING,        /* currently executing on the CPU       */
-    TASK_STATE_TERMINATED      /* finished; slot will be recycled      */
+    TASK_STATE_READY,          /* runnable, waiting to be scheduled   */
+    TASK_STATE_RUNNING,        /* currently executing on the CPU      */
+    TASK_STATE_TERMINATED      /* finished; slot will be recycled     */
 } TaskState;
 
+/*
+ * Logical privilege level for a task.
+ *
+ * Higher numeric values are more privileged:
+ *   USER   (0) – least privileged
+ *   DRIVER (1) – mid-level, can talk to hardware-facing subsystems
+ *   KERNEL (2) – most privileged, core kernel and management threads
+ *
+ * All tasks still execute in ring 0 today; this is a software
+ * hierarchy used for access control decisions and future paging work.
+ */
+typedef enum {
+    TASK_PRIV_USER   = 0,
+    TASK_PRIV_DRIVER = 1,
+    TASK_PRIV_KERNEL = 2,
+} TaskPrivilege;
+
 /* ================================================================
  *  Task entry function
  * ================================================================ */
@@ -44,9 +61,10 @@ typedef void (*TaskEntryFn)(void *arg);
  * ================================================================ */
 
 typedef struct Task {
-    UINT32      pid;                    /* unique process ID              */
-    TaskState   state;                  /* current lifecycle state        */
-    CHAR16      name[TASK_NAME_LEN];    /* human-readable label           */
+    UINT32        pid;                  /* unique process ID              */
+    TaskState     state;                /* current lifecycle state        */
+    TaskPrivilege privilege;            /* logical privilege level        */
+    CHAR16        name[TASK_NAME_LEN];  /* human-readable label           */
 
     /* Context switch state */
     UINT64      saved_rsp;              /* RSP saved by context_switch()  */
@@ -66,11 +84,21 @@ typedef struct Task {
  * ================================================================ */
 
 void   task_init(BootInfo *Boot);       /* initialise scheduler           */
-Task  *task_create(const CHAR16 *name,  /* spawn a new task               */
+
+/* Spawn a new task with a specific privilege level. */
+Task  *task_create_with_priv(const CHAR16 *name,
+                             TaskEntryFn entry,
+                             void *arg,
+                             TaskPrivilege privilege);
+
+/* Backwards-compatible helper: creates a kernel-privileged task. */
+Task  *task_create(const CHAR16 *name,
                    TaskEntryFn entry, void *arg);
 void   task_yield(void);               /* voluntarily give up the CPU    */
 void   task_exit(void);                /* terminate the current task     */
 Task  *task_current(void);             /* return the running task's PCB  */
+TaskPrivilege task_get_privilege(Task *t);
+void          task_set_privilege(Task *t, TaskPrivilege privilege);
 UINTN  task_count(void);              /* number of non-FREE tasks        */
 void   task_print_list(BootInfo *Boot); /* print task table (for `ps`)   */