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linux-vybrid_pu...
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arch
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h8300
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platform
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h8300h
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generic
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crt0_ram.S

crt0_ram.S 1.7 KB
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  1. /*
    2. 

  2.  *  linux/arch/h8300/platform/h8300h/generic/crt0_ram.S
    3. 

  3.  *
    4. 

  4.  *  Yoshinori Sato <ysato@users.sourceforge.jp>
    5. 

  5.  *
    6. 

  6.  *  Platform depend startup
    7. 

  7.  *  Target Archtecture:	AE-3068 (aka. aki3068net)
    8. 

  8.  *  Memory Layout     :	RAM
    9. 

  9.  */
    10. 

  10. 

  11. #define ASSEMBLY
    12. 

  12. 

  13. #include <linux/config.h>
    14. 

  14. #include <asm/linkage.h>
    15. 

  15. 	
    16. 

  16. #if !defined(CONFIG_BLKDEV_RESERVE)
    17. 

  17. #if defined(CONFIG_GDB_DEBUG)
    18. 

  18. #define RAMEND (__ramend - 0xc000)
    19. 

  19. #else
    20. 

  20. #define RAMEND __ramend
    21. 

  21. #endif
    22. 

  22. #else
    23. 

  23. #define RAMEND CONFIG_BLKDEV_RESERVE_ADDRESS
    24. 

  24. #endif
    25. 

  25. 	
    26. 

  26. 	.global SYMBOL_NAME(_start)
    27. 

  27. 	.global SYMBOL_NAME(command_line)
    28. 

  28. 	.global SYMBOL_NAME(_platform_gpio_table)
    29. 

  29. 	.global SYMBOL_NAME(_target_name)
    30. 

  30. 	
    31. 

  31. 	.h8300h
    32. 

  32. 

  33. 	.section .text
    34. 

  34. 	.file	"crt0_ram.S"
    35. 

  35. 

  36. 	/* CPU Reset entry */
    37. 

  37. SYMBOL_NAME_LABEL(_start)
    38. 

  38. 	mov.l	#RAMEND,sp
    39. 

  39. 	ldc	#0x80,ccr
    40. 

  40. 

  41. 	/* Peripheral Setup */
    42. 

  42. 	
    43. 

  43. #if defined(CONFIG_BLK_DEV_BLKMEM)
    44. 

  44. 	/* move romfs image */
    45. 

  45. 	jsr	@__move_romfs	
    46. 

  46. #endif
    47. 

  47. 	
    48. 

  48. 	/* .bss clear */
    49. 

  49. 	mov.l	#__sbss,er5
    50. 

  50. 	mov.l	#__ebss,er4
    51. 

  51. 	sub.l	er5,er4
    52. 

  52. 	shlr	er4
    53. 

  53. 	shlr	er4
    54. 

  54. 	sub.l	er0,er0
    55. 

  55. 1:	
    56. 

  56. 	mov.l	er0,@er5
    57. 

  57. 	adds	#4,er5
    58. 

  58. 	dec.l	#1,er4
    59. 

  59. 	bne	1b
    60. 

  60. 

  61. 	/* copy kernel commandline */
    62. 

  62. 	mov.l	#COMMAND_START,er5
    63. 

  63. 	mov.l	#SYMBOL_NAME(command_line),er6
    64. 

  64. 	mov.w	#512,r4
    65. 

  65. 	eepmov.w
    66. 

  66. 

  67. 	/* uClinux kernel start */
    68. 

  68. 	ldc	#0x90,ccr	/* running kernel */
    69. 

  69. 	mov.l	#SYMBOL_NAME(init_thread_union),sp
    70. 

  70. 	add.l	#0x2000,sp
    71. 

  71. 	jsr	@_start_kernel
    72. 

  72. _exit:
    73. 

  73. 

  74. 	jmp	_exit
    75. 

  75. 

  76. 	rts
    77. 

  77. 

  78. 	/* I/O port assign information */
    79. 

  79. __platform_gpio_table:	
    80. 

  80. 	mov.l	#gpio_table,er0
    81. 

  81. 	rts
    82. 

  82. 

  83. gpio_table:
    84. 

  84. 	;; P1DDR
    85. 

  85. 	.byte	0x00,0x00
    86. 

  86. 	;; P2DDR
    87. 

  87. 	.byte	0x00,0x00
    88. 

  88. 	;; P3DDR
    89. 

  89. 	.byte	0x00,0x00
    90. 

  90. 	;; P4DDR
    91. 

  91. 	.byte	0x00,0x00
    92. 

  92. 	;; P5DDR
    93. 

  93. 	.byte	0x00,0x00
    94. 

  94. 	;; P6DDR
    95. 

  95. 	.byte	0x00,0x00
    96. 

  96. 	;; dummy
    97. 

  97. 	.byte	0x00,0x00
    98. 

  98. 	;; P8DDR
    99. 

  99. 	.byte	0x00,0x00
    100. 

  100. 	;; P9DDR
    101. 

  101. 	.byte	0x00,0x00
    102. 

  102. 	;; PADDR
    103. 

  103. 	.byte	0x00,0x00
    104. 

  104. 	;; PBDDR
    105. 

  105. 	.byte	0x00,0x00
    106. 

  106. 

  107. __target_name:	
    108. 

  108. 	.asciz	"generic"
    109.