just some cleanup and minor changes fremma help idk which of your vars to use

src/PCB.c

@@ -32,7 +32,7 @@ void schedule()
         curproc=(curproc<NUM_PROCS-1)?curproc+1:0;
     }
     serial_writestring("about to switch\n");
-    context_switch(&procs[old]->ctxt, procs[curproc]->ctxt);
+    //context_switch(&procs[old]->ctxt, procs[curproc]->ctxt);
     serial_writestring("switched\n");
     //procs[old]->state=RUNNABLE;
     procs[curproc]->state=RUNNING;

src/PCB.h

@@ -47,6 +47,7 @@ typedef struct//all regs in proc
 
 typedef struct//regs needed for context
 {
+    uint3t_t cr3;
     uint32_t edi;
     uint32_t esi;
     uint32_t ebx;

src/helloworld.asm

+	;;  compile with nasm -felf32 hello.asm
+
+	Section .text
+	global main
+main:
+        mov eax, 4
+	int 0x80
+        mov eax, 5
+	int 0x80

src/idta.asm

@@ -5,10 +5,10 @@ extern kstack
 %macro error_interrupt 1
 global interrupt_handler_%1
 interrupt_handler_%1:
-        push ebp
-        push esp
-        mov ebp, kstack
-        mov esp, kstack
+        ;push ebp
+        ;push esp
+        ;mov ebp, kstack
+        ;mov esp, kstack
 	push 	dword %1
 	jmp 	common_handler
 %endmacro
@@ -17,10 +17,10 @@ interrupt_handler_%1:
 global interrupt_handler_%1
 interrupt_handler_%1:
 	push 	dword 0
-        push ebp
-        push esp
-        mov ebp, kstack
-        mov esp, kstack
+        ;push ebp
+        ;push esp
+        ;mov ebp, kstack
+        ;mov esp, kstack
 	push 	dword %1
 	jmp 	common_handler
 %endmacro
@@ -39,8 +39,8 @@ common_handler:
         pop dword ds
         
 	add	esp, 4
-        pop esp
-        pop ebp
+        ;pop esp
+        ;pop ebp
         add	esp, 4
 	iret
 

src/switch.asm

@@ -7,10 +7,12 @@ context_switch:
         push ebx
         push esi
         push edi
+        push cr3
 
         mov [eax], esp
         mov esp, edx
 
+        pop cr3
         pop edi
         pop esi
         pop ebx