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ps3-head.S

ps3-head.S 2.1 KB
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  1. /*
    2. 

  2.  *  PS3 bootwrapper entry.
    3. 

  3.  *
    4. 

  4.  *  Copyright (C) 2007 Sony Computer Entertainment Inc.
    5. 

  5.  *  Copyright 2007 Sony Corp.
    6. 

  6.  *
    7. 

  7.  *  This program is free software; you can redistribute it and/or modify
    8. 

  8.  *  it under the terms of the GNU General Public License as published by
    9. 

  9.  *  the Free Software Foundation; version 2 of the License.
    10. 

  10.  *
    11. 

  11.  *  This program is distributed in the hope that it will be useful,
    12. 

  12.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    13. 

  13.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14. 

  14.  *  GNU General Public License for more details.
    15. 

  15.  *
    16. 

  16.  *  You should have received a copy of the GNU General Public License
    17. 

  17.  *  along with this program; if not, write to the Free Software
    18. 

  18.  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    19. 

  19.  */
    20. 

  20. 

  21. #include "ppc_asm.h"
    22. 

  22. 

  23. 	.machine "ppc64"
    24. 

  24. 

  25. 	.text
    26. 

  26. 

  27. /*
    28. 

  28.  * __system_reset_overlay - The PS3 first stage entry.
    29. 

  29.  *
    30. 

  30.  * The bootwraper build script copies the 512 bytes at symbol
    31. 

  31.  * __system_reset_overlay to offset 0x100 of the rom image.  This symbol
    32. 

  32.  * must occupy 512 or less bytes.
    33. 

  33.  *
    34. 

  34.  * The PS3 has a single processor with two threads.
    35. 

  35.  */
    36. 

  36. 

  37. 	.globl __system_reset_overlay
    38. 

  38. __system_reset_overlay:
    39. 

  39. 

  40. 	/* Switch to 32-bit mode. */
    41. 

  41. 

  42. 	mfmsr	r9
    43. 

  43. 	clrldi	r9,r9,1
    44. 

  44. 	mtmsrd	r9
    45. 

  45. 	nop
    46. 

  46. 

  47. 	/* Get thread number in r3 and branch. */
    48. 

  48. 

  49. 	mfspr	r3, 0x88
    50. 

  50. 	cntlzw.	r3, r3
    51. 

  51. 	beq	1f
    52. 

  52. 

  53. 	/* Secondary goes to __secondary_hold in kernel. */
    54. 

  54. 

  55. 	li	r4, 0x60
    56. 

  56. 	mtctr	r4
    57. 

  57. 	bctr
    58. 

  58. 

  59. 1:
    60. 

  60. 	/* Primary delays then goes to _zimage_start in wrapper. */
    61. 

  61. 

  62. 	or	31, 31, 31 /* db16cyc */
    63. 

  63. 	or	31, 31, 31 /* db16cyc */
    64. 

  64. 

  65. 	lis	r4, _zimage_start@ha
    66. 

  66. 	addi	r4, r4, _zimage_start@l
    67. 

  67. 	mtctr	r4
    68. 

  68. 	bctr
    69. 

  69. 

  70. 	. = __system_reset_overlay + 512
    71. 

  71. 

  72. /*
    73. 

  73.  * __system_reset_kernel - Place holder for the kernel reset vector.
    74. 

  74.  *
    75. 

  75.  * The bootwrapper build script copies 512 bytes from offset 0x100
    76. 

  76.  * of the rom image to the symbol __system_reset_kernel.  At runtime
    77. 

  77.  * the bootwrapper program copies the 512 bytes at __system_reset_kernel
    78. 

  78.  * to ram address 0x100.  This symbol must occupy 512 bytes.
    79. 

  79.  */
    80. 

  80. 

  81. 	.globl __system_reset_kernel
    82. 

  82. __system_reset_kernel:
    83. 

  83. 

  84. 	. = __system_reset_kernel + 512
    85. 

  85.