Bit of cleanup, messages. Kernel stack still not properly formed.

src/PCB.c

@@ -55,6 +55,7 @@ int yield()
     procs[curproc]->state = RUNNABLE;
     serial_writestring("about to schedule\n");
     schedule();
+    serial_writestring("echeduled\n");
     //unlock mutex
     return 1;
 }

src/switch.asm

@@ -2,7 +2,10 @@ global context_switch
 context_switch:
         mov eax, [esp+4]
         mov edx, [esp+8]
-        
+
+        ; set return of new context to current context's
+        ; address, so that we return to the proper location
+        ; in kernel memory
         mov ecx, [esp]
         mov [edx+20], ecx
 
@@ -13,10 +16,6 @@ context_switch:
         mov ecx, cr3
         push ecx
 
-        ; CR3 PROBLEM - STACK CHANGES, CANT ACCESS NEW MEM?
-        ; WHY IS PROCS[CURPROC]->CTXT IN PROCESS MEM, NOT
-        ; IN KERNEL MEM? INTERROGATE FREMMA
-
         mov [eax], esp
         mov esp, edx