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arch
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xtensa
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boot
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boot-elf
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bootstrap.S

bootstrap.S 1.9 KB
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  1. /*
    2. 

  2.  * arch/xtensa/boot/boot-elf/bootstrap.S
    3. 

  3.  *
    4. 

  4.  * Low-level exception handling
    5. 

  5.  *
    6. 

  6.  * This file is subject to the terms and conditions of the GNU General Public
    7. 

  7.  * License.  See the file "COPYING" in the main directory of this archive
    8. 

  8.  * for more details.
    9. 

  9.  *
    10. 

  10.  * Copyright (C) 2004 - 2013 by Tensilica Inc.
    11. 

  11.  *
    12. 

  12.  * Chris Zankel <chris@zankel.net>
    13. 

  13.  * Marc Gauthier <marc@tensilica.com>
    14. 

  14.  * Piet Delaney <piet@tensilica.com>
    15. 

  15.  */
    16. 

  16. 

  17. #include <asm/bootparam.h>
    18. 

  18. #include <asm/processor.h>
    19. 

  19. #include <asm/pgtable.h>
    20. 

  20. #include <asm/page.h>
    21. 

  21. #include <asm/cacheasm.h>
    22. 

  22. #include <asm/initialize_mmu.h>
    23. 

  23. #include <linux/linkage.h>
    24. 

  24. 

  25. 	.section	.ResetVector.text, "ax"
    26. 

  26. 	.global         _ResetVector
    27. 

  27. 	.global         reset
    28. 

  28. 

  29. _ResetVector:
    30. 

  30. 	_j _SetupMMU
    31. 

  31. 

  32. 	.begin  no-absolute-literals
    33. 

  33. 	.literal_position
    34. 

  34. 

  35. 	.align 4
    36. 

  36. RomInitAddr:
    37. 

  37. #if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \
    38. 

  38. 	XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
    39. 

  39. 	.word 0x00003000
    40. 

  40. #else
    41. 

  41. 	.word 0xd0003000
    42. 

  42. #endif
    43. 

  43. RomBootParam:
    44. 

  44. 	.word _bootparam
    45. 

  45. _bootparam:
    46. 

  46. 	.short	BP_TAG_FIRST
    47. 

  47. 	.short	4
    48. 

  48. 	.long	BP_VERSION
    49. 

  49. 	.short	BP_TAG_LAST
    50. 

  50. 	.short	0
    51. 

  51. 	.long	0
    52. 

  52. 

  53. 	.align  4
    54. 

  54. _SetupMMU:
    55. 

  55. 	movi	a0, 0
    56. 

  56. 	wsr	a0, windowbase
    57. 

  57. 	rsync
    58. 

  58. 	movi	a0, 1
    59. 

  59. 	wsr	a0, windowstart
    60. 

  60. 	rsync
    61. 

  61. 	movi	a0, 0x1F
    62. 

  62. 	wsr	a0, ps
    63. 

  63. 	rsync
    64. 

  64. 

  65. 	Offset = _SetupMMU - _ResetVector
    66. 

  66. 

  67. #ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
    68. 

  68. 	initialize_mmu
    69. 

  69. #endif
    70. 

  70. 

  71. 	.end    no-absolute-literals
    72. 

  72. 

  73. 	rsil    a0, XCHAL_DEBUGLEVEL-1
    74. 

  74. 	rsync
    75. 

  75. reset:
    76. 

  76. 	l32r    a0, RomInitAddr
    77. 

  77. 	l32r	a2, RomBootParam
    78. 

  78. 	movi	a3, 0
    79. 

  79. 	movi	a4, 0
    80. 

  80. 	jx      a0
    81. 

  81. 

  82. 	.align 4
    83. 

  83. 

  84. 	.section	.ResetVector.remapped_text, "x"
    85. 

  85. 	.global         _RemappedResetVector
    86. 

  86. 

  87. 	/* Do org before literals */
    88. 

  88. 	.org 0
    89. 

  89. 

  90. _RemappedResetVector:
    91. 

  91. 	.begin  no-absolute-literals
    92. 

  92. 	.literal_position
    93. 

  93. 

  94. 	_j	_RemappedSetupMMU
    95. 

  95. 

  96. 	/* Position Remapped code at the same location as the original code */
    97. 

  97. 	. = _RemappedResetVector + Offset
    98. 

  98. 

  99. _RemappedSetupMMU:
    100. 

  100. #ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
    101. 

  101. 	initialize_mmu
    102. 

  102. #endif
    103. 

  103. 

  104. 	.end    no-absolute-literals
    105.