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         .text
  24
  25 /*
  26  * __system_reset_overlay - The PS3 first stage entry.
  27  *
  28  * The bootwraper build script copies the 0x100 bytes at symbol
  29  * __system_reset_overlay to offset 0x100 of the rom image.
  30  *
  31  * The PS3 has a single processor with two threads.
  32  */
  33
  34         .globl __system_reset_overlay
  35 __system_reset_overlay:
  36
  37         /* Switch to 32-bit mode. */
  38
  39         mfmsr   r9
  40         clrldi  r9,r9,1
  41         mtmsrd  r9
  42         nop
  43
  44         /* Get thread number in r3 and branch. */
  45
  46         mfspr   r3, 0x88
  47         cntlzw. r3, r3
  48         li      r4, 0
  49         li      r5, 0
  50         beq     1f
  51
  52         /* Secondary goes to __secondary_hold in kernel. */
  53
  54         li      r4, 0x60
  55         mtctr   r4
  56         bctr
  57
  58         /* Primary delays then goes to _zimage_start in wrapper. */
  59 1:
  60         or      31, 31, 31 /* db16cyc */
  61         or      31, 31, 31 /* db16cyc */
  62
  63         lis     r4, _zimage_start@ha
  64         addi    r4, r4, _zimage_start@l
  65         mtctr   r4
  66         bctr
  67
  68 /*
  69  * __system_reset_kernel - Place holder for the kernel reset vector.
  70  *
  71  * The bootwrapper build script copies 0x100 bytes from offset 0x100
  72  * of the rom image to the symbol __system_reset_kernel.  At runtime
  73  * the bootwrapper program copies the 0x100 bytes at __system_reset_kernel
  74  * to ram address 0x100.  This symbol must occupy 0x100 bytes.
  75  */
  76
  77         .globl __system_reset_kernel
  78 __system_reset_kernel:
  79
  80         . = __system_reset_kernel + 0x100