/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are
 permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of
 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project nor the names of its
 contributors may be used to endorse or promote products derived from this software
 without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

*****************************************************************************************/

.globl timerInt
.text
.code32
timerInt:                 
  pushl %edx              /* Push Register That We Are Going To Touch */
  pushl %ecx              
  pushl %ebx              
  pushl %eax             
  movl systemVitals,%ecx  /* Put Location Of System Vitals Into ECX   */
  incl 4(%ecx)             /* Increment sysTicks our 1000ms counter    */
  mov $0x20,%dx            /* The Following Sends Our EOI To The MPIC  */
  mov $0x20,%ax           
  outb %al,%dx            
  mov $0xA0,%dx            /* The Following Sends Our EOI To The SPID  */
  outb %al,%dx            
  movl 4(%ecx),%eax        /* Increment our sysUptime by 1S if 1000MS  */
  movl $1000,%ebx          /* Have Passed                              */
  xor %edx,%edx           
  div %ebx               
  test %edx,%edx          
  jnz next                
  incl 8(%ecx)            
next:                     
  movl 4(%ecx),%eax        /* Test If quantum Has Passed If So Then    */
  movl 12(%ecx),%ebx       /* We Can CALL sched                        */
  xor %edx,%edx           
  div %ebx                
  test %edx,%edx          
  jnz done                
  call sched              
done:                     
  popl %eax                /* Restore Register And IRET                */
  popl %ebx               
  popl %ecx               
  popl %edx               
  iret                    

/***
 $Log$
 Revision 1.1  2004/06/17 12:11:14  reddawg
 timerInt: removed from src/sys/sys/idt.c and moved into a file by itself
           in src/sys/kernel/timer.S

 END
 ***/

