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head-rom.S

head-rom.S 1.8 KB
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  1. 	
    2. 

  2. 	.global _start
    3. 

  3. 	.global _stext
    4. 

  4. 

  5. 	.global _rambase
    6. 

  6. 	.global _ramvec
    7. 

  7. 	.global _ramstart
    8. 

  8. 	.global _ramend
    9. 

  9. 

  10. #ifdef CONFIG_INIT_LCD
    11. 

  11. 	.global bootlogo_bits
    12. 

  12. #endif
    13. 

  13. 

  14. 	.data
    15. 

  15. 

  16. /*
    17. 

  17.  *      Set up the usable of RAM stuff. Size of RAM is determined then
    18. 

  18.  *      an initial stack set up at the end.
    19. 

  19.  */
    20. 

  20. .align 4
    21. 

  21. _ramvec:
    22. 

  22. .long   0
    23. 

  23. _rambase:
    24. 

  24. .long   0
    25. 

  25. _ramstart:
    26. 

  26. .long   0
    27. 

  27. _ramend:
    28. 

  28. .long   0
    29. 

  29. 

  30. #define	RAMEND	(CONFIG_RAMBASE + CONFIG_RAMSIZE)
    31. 

  31. 

  32. 	.text
    33. 

  33. _start:
    34. 

  34. _stext:	movew	#0x2700,%sr
    35. 

  35. #ifdef CONFIG_INIT_LCD
    36. 

  36. 	movel	#bootlogo_bits, 0xfffffA00 /* LSSA */
    37. 

  37. 	moveb	#0x28,   0xfffffA05	/* LVPW */
    38. 

  38. 	movew	#0x280,  0xFFFFFa08	/* LXMAX */
    39. 

  39. 	movew	#0x1df,  0xFFFFFa0a	/* LYMAX */
    40. 

  40. 	moveb	#0,      0xfffffa29	/* LBAR */
    41. 

  41. 	moveb	#0,      0xfffffa25	/* LPXCD */
    42. 

  42. 	moveb	#0x08,   0xFFFFFa20	/* LPICF */
    43. 

  43. 	moveb	#0x01,   0xFFFFFA21	/* -ve pol */
    44. 

  44. 	moveb	#0x81,   0xfffffA27	/* LCKCON */
    45. 

  45. 	movew	#0xff00, 0xfffff412	/* LCD pins */
    46. 

  46. #endif
    47. 

  47. 	moveal  #RAMEND-CONFIG_MEMORY_RESERVE*0x100000 - 0x10, %sp
    48. 

  48. 	movew	#32767, %d0  /* PLL settle wait loop */
    49. 

  49. 1:	subq	#1, %d0
    50. 

  50. 	bne	1b
    51. 

  51. 

  52. 	/* Copy data segment from ROM to RAM */
    53. 

  53. 	moveal	#_etext, %a0
    54. 

  54. 	moveal	#_sdata, %a1
    55. 

  55. 	moveal	#_edata, %a2
    56. 

  56. 

  57. 	/* Copy %a0 to %a1 until %a1 == %a2 */
    58. 

  58. 1:	movel	%a0@+, %a1@+
    59. 

  59. 	cmpal	%a1, %a2
    60. 

  60. 	bhi	1b
    61. 

  61. 

  62. 	moveal	#_sbss, %a0
    63. 

  63. 	moveal	#_ebss, %a1
    64. 

  64. 	/* Copy 0 to %a0 until %a0 == %a1 */
    65. 

  65. 	
    66. 

  66. 1:
    67. 

  67. 	clrl	%a0@+
    68. 

  68. 	cmpal	%a0, %a1
    69. 

  69. 	bhi	1b
    70. 

  70. 

  71.         movel   #_sdata, %d0    
    72. 

  72.         movel   %d0, _rambase        
    73. 

  73.         movel   #_ebss, %d0
    74. 

  74.         movel   %d0, _ramstart
    75. 

  75. 	movel	#RAMEND-CONFIG_MEMORY_RESERVE*0x100000, %d0
    76. 

  76. 	movel	%d0, _ramend
    77. 

  77. 	movel	#CONFIG_VECTORBASE,	%d0
    78. 

  78. 	movel	%d0, _ramvec
    79. 

  79. 	
    80. 

  80. /*
    81. 

  81.  * load the current task pointer and stack
    82. 

  82.  */
    83. 

  83. 	lea	init_thread_union, %a0
    84. 

  84. 	lea	0x2000(%a0), %sp
    85. 

  85. 

  86. 1:	jsr	start_kernel
    87. 

  87.         bra 1b
    88. 

  88. _exit:
    89. 

  89. 

  90. 	jmp	_exit
    91. 

  91. 

  92. 

  93. putc:
    94. 

  94. 	moveb	%d7,0xfffff907
    95. 

  95. 1:
    96. 

  96. 	movew	0xfffff906, %d7
    97. 

  97. 	andw	#0x2000, %d7
    98. 

  98. 	beq	1b
    99. 

  99. 	rts
    100. 

  100. 

  101. 	.data
    102. 

  102. env:
    103. 

  103. 	.long	0
    104. 

  104. 	.text
    105. 

  105.