arch/powerpc/boot/ps3-head.S

   1 /*
   2  *  PS3 bootwrapper entry.
   3  *
   4  *  Copyright (C) 2007 Sony Computer Entertainment Inc.
   5  *  Copyright 2007 Sony Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "ppc_asm.h"
  22
  23         .machine "ppc64"
  24
  25         .text
  26
  27 /*
  28  * __system_reset_overlay - The PS3 first stage entry.
  29  *
  30  * The bootwraper build script copies the 512 bytes at symbol
  31  * __system_reset_overlay to offset 0x100 of the rom image.  This symbol
  32  * must occupy 512 or less bytes.
  33  *
  34  * The PS3 has a single processor with two threads.
  35  */
  36
  37         .globl __system_reset_overlay
  38 __system_reset_overlay:
  39
  40         /* Switch to 32-bit mode. */
  41
  42         mfmsr   r9
  43         clrldi  r9,r9,1
  44         mtmsrd  r9
  45         nop
  46
  47         /* Get thread number in r3 and branch. */
  48
  49         mfspr   r3, 0x88
  50         cntlzw. r3, r3
  51         beq     1f
  52
  53         /* Secondary goes to __secondary_hold in kernel. */
  54
  55         li      r4, 0x60
  56         mtctr   r4
  57         bctr
  58
  59 1:
  60         /* Save the value at addr zero for a null pointer write check later. */
  61
  62         li      r4, 0
  63         lwz     r3, 0(r4)
  64
  65         /* Primary delays then goes to _zimage_start in wrapper. */
  66
  67         or      31, 31, 31 /* db16cyc */
  68         or      31, 31, 31 /* db16cyc */
  69
  70         lis     r4, _zimage_start@ha
  71         addi    r4, r4, _zimage_start@l
  72         mtctr   r4
  73         bctr
  74
  75         . = __system_reset_overlay + 512
  76
  77 /*
  78  * __system_reset_kernel - Place holder for the kernel reset vector.
  79  *
  80  * The bootwrapper build script copies 512 bytes from offset 0x100
  81  * of the rom image to the symbol __system_reset_kernel.  At runtime
  82  * the bootwrapper program copies the 512 bytes at __system_reset_kernel
  83  * to ram address 0x100.  This symbol must occupy 512 bytes.
  84  */
  85
  86         .globl __system_reset_kernel
  87 __system_reset_kernel:
  88
  89         . = __system_reset_kernel + 512