- minor optimizations

- we push only the required registers



git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@53 315a16e6-25f9-4109-90ae-ca3045a26c18

arch/x86/kernel/entry.asm

@@ -501,7 +501,9 @@ extern scheduler
 global reschedule
 reschedule:
     cli
-    pusha
+    ; eax could change across a function call
+    ; => we have not to save the original eax value
+    push ebx 
 
     push DWORD [current_task]
     call scheduler
@@ -519,7 +521,7 @@ hack1:
     jmp 0x00 : 0xDEADBEAF
 
 no_task_switch1:
-    popa
+    pop ebx
     sti
     ret