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[palacios.git] / palacios / src / geekos / lowlevel.asm

diff --git a/palacios/src/geekos/lowlevel.asm b/palacios/src/geekos/lowlevel.asm
index 1758b8f..1e2f409 100644 (file)
--- a/palacios/src/geekos/lowlevel.asm
+++ b/palacios/src/geekos/lowlevel.asm
@@ -2,7 +2,7 @@
 ; Low level interrupt/thread handling code for GeekOS.
 ; Copyright (c) 2001,2003,2004 David H. Hovemeyer <daveho@cs.umd.edu>
 ; Copyright (c) 2003, Jeffrey K. Hollingsworth <hollings@cs.umd.edu>
-; $Revision: 1.6 $
+; $Revision: 1.7 $
 
 ; This is free software.  You are permitted to use,
 ; redistribute, and modify it as specified in the file "COPYING".
@@ -126,6 +126,7 @@ IMPORT Make_Runnable
 ; Function to activate a new user context (if needed).
 IMPORT Switch_To_User_Context
 
+; Debug functions
 IMPORT SerialPrintHex
 IMPORT SerialPutChar
 
@@ -424,6 +425,17 @@ Handle_Interrupt:
        mov     esi, [esp+REG_SKIP]     ; get interrupt number
        mov     ebx, [eax+esi*4]        ; get address of handler function
 
+       push    esi
+       call    SerialPrintHex
+       pop     esi
+
+       push    eax
+       mov     eax, 0xa
+       push    eax
+       call    SerialPutChar
+       pop     eax
+       pop     eax
+
        ; Call the handler.
        ; The argument passed is a pointer to an Interrupt_State struct,
        ; which describes the stack layout for all interrupts.
@@ -503,6 +515,21 @@ Handle_Interrupt:
        ; Restore registers
        Restore_Registers
 
+
+       pusha   
+
+       mov     eax, 0xaa
+       push    eax
+       call    SerialPrintHex
+       pop     eax
+
+       mov     eax, 0xa
+       push    eax
+       call    SerialPutChar
+       pop     eax
+
+       popa
+
        ; Return from the interrupt.
        iret