qemu/roms/SLOF/slof/lowmem.S

   1 /******************************************************************************
   2  * Copyright (c) 2004, 2008 IBM Corporation
   3  * All rights reserved.
   4  * This program and the accompanying materials
   5  * are made available under the terms of the BSD License
   6  * which accompanies this distribution, and is available at
   7  * http://www.opensource.org/licenses/bsd-license.php
   8  *
   9  * Contributors:
  10  *     IBM Corporation - initial implementation
  11  *****************************************************************************/
  12
  13 #include <cpu.h>
  14 #include <xvect.h>
  15
  16         .globl _start
  17         /* All exception vectors *******************/
  18 _start:
  19         .org 0x100
  20         /* check if Master / Slave *****************/
  21         /* Master will go to XVECT_M_HANDLER       */
  22         /* Slave  will go to XVECT_S_HANDLER       */
  23 #ifdef SECONDARY_CPUS_STOPPED
  24         ld      r3,XVECT_S_HANDLER(0)
  25         mfspr   r0, PIR
  26         cmpwi   r0, 0
  27         bne     0f
  28 #endif
  29         ld      r3,XVECT_M_HANDLER(0)
  30 0:
  31         mtctr   r3
  32         li      r0,0x100
  33         bctr
  34
  35         /* FIXME: Also need 0280, 0380, 0f20, etc. */
  36
  37         .irp i, 0x0200,0x0280,0x0300,0x0380,0x0400,0x0480,0x0500,0x0600,0x0700, \
  38                 0x0800,0x0900,0x0a00,0x0b00,0x0c00,0x0d00,0x0e00,0x0f00, \
  39                 0x1000,0x1100,0x1200,0x1300,0x1400,0x1500,0x1600,0x1700, \
  40                 0x1800,0x1900,0x1a00,0x1b00,0x1c00,0x1d00,0x1e00,0x1f00, \
  41                 0x2000,0x2100,0x2200,0x2300,0x2400,0x2500,0x2600,0x2700, \
  42                 0x2800,0x2900,0x2a00,0x2b00,0x2c00,0x2d00,0x2e00,0x2f00
  43         .org \i
  44
  45         /* enable this if you get exceptions before the console works    */
  46         /* this will allow using the hardware debugger to see where      */
  47         /* it traps, and with what register values etc.                  */
  48         // b    $
  49
  50         mtsprg  0,r0
  51         mfctr   r0
  52         mtsprg  2,r0
  53         mflr    r0
  54         mtsprg  3,r0
  55         ld      r0, XVECT_M_HANDLER(0)
  56         mtctr   r0
  57         li      r0,\i
  58         bctr
  59         .endr
  60
  61
  62         .org XVECT_M_HANDLER
  63         .quad 0
  64
  65         .org XVECT_S_HANDLER
  66         .quad 0
  67
  68         .org XVECT_TOPADDR
  69         .byte 0x36              # to fill out to exactly 16kB