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linux-libre
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arch
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m68k
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kernel
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sun3-head.S

sun3-head.S 2.0 KB
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  1. #include <linux/linkage.h>
    2. 

  2. #include <linux/init.h>
    3. 

  3. 

  4. #include <asm/entry.h>
    5. 

  5. #include <asm/page.h>
    6. 

  6. #include <asm/contregs.h>
    7. 

  7. #include <asm/sun3-head.h>
    8. 

  8. 

  9. PSL_HIGHIPL     = 0x2700
    10. 

  10. NBSG            = 0x20000
    11. 

  11. ICACHE_ONLY	= 0x00000009
    12. 

  12. CACHES_OFF	= 0x00000008	| actually a clear and disable --m
    13. 

  13. #define MAS_STACK INT_STACK
    14. 

  14. ROOT_TABLE_SIZE = 128
    15. 

  15. PAGESIZE	= 8192
    16. 

  16. SUN3_INVALID_PMEG = 255
    17. 

  17. .globl bootup_user_stack
    18. 

  18. .globl bootup_kernel_stack
    19. 

  19. .globl pg0
    20. 

  20. .globl swapper_pg_dir
    21. 

  21. .globl kernel_pmd_table
    22. 

  22. .globl availmem
    23. 

  23. .global m68k_pgtable_cachemode
    24. 

  24. .global kpt
    25. 

  25. | todo: all these should be in bss!
    26. 

  26. swapper_pg_dir:                .skip 0x2000
    27. 

  27. pg0:                           .skip 0x2000
    28. 

  28. kernel_pmd_table:              .skip 0x2000
    29. 

  29. 

  30. .globl kernel_pg_dir
    31. 

  31. .equ    kernel_pg_dir,kernel_pmd_table
    32. 

  32. 

  33. 	__HEAD
    34. 

  34. ENTRY(_stext)
    35. 

  35. ENTRY(_start)
    36. 

  36. 

  37. /* Firstly, disable interrupts and set up function codes. */
    38. 

  38. 	movew	#PSL_HIGHIPL, %sr
    39. 

  39. 	moveq	#FC_CONTROL, %d0
    40. 

  40. 	movec	%d0, %sfc
    41. 

  41. 	movec	%d0, %dfc
    42. 

  42. 

  43. /* Make sure we're in context zero. */
    44. 

  44. 	moveq	#0, %d0
    45. 

  45. 	movsb	%d0, AC_CONTEXT
    46. 

  46. 

  47. /* map everything the bootloader left us into high memory, clean up the
    48. 

  48.    excess later */
    49. 

  49. 	lea	(AC_SEGMAP+0),%a0
    50. 

  50. 	lea	(AC_SEGMAP+KERNBASE),%a1
    51. 

  51. 1:
    52. 

  52. 	movsb	%a0@, %d1
    53. 

  53. 	movsb	%d1, %a1@
    54. 

  54. 	cmpib	#SUN3_INVALID_PMEG, %d1
    55. 

  55. 	beq	2f
    56. 

  56. 	addl	#NBSG,%a0
    57. 

  57. 	addl	#NBSG,%a1
    58. 

  58. 	jmp	1b
    59. 

  59. 

  60. 2:
    61. 

  61. 

  62. /* Disable caches and jump to high code. */
    63. 

  63. 	moveq	#ICACHE_ONLY,%d0	| Cache disabled until we're ready to enable it
    64. 

  64. 	movc	%d0, %cacr	|   is this the right value? (yes --m)
    65. 

  65. 	jmp	1f:l
    66. 

  66. 

  67. /* Following code executes at high addresses (0xE000xxx). */
    68. 

  68. 1:	lea	init_task,%curptr			| get initial thread...
    69. 

  69. 	lea	init_thread_union+THREAD_SIZE,%sp	| ...and its stack.
    70. 

  70. 

  71. /* Point MSP at an invalid page to trap if it's used. --m */
    72. 

  72. 	movl	#(PAGESIZE),%d0
    73. 

  73. 	movc	%d0,%msp
    74. 

  74. 	moveq	#-1,%d0
    75. 

  75. 	movsb	%d0,(AC_SEGMAP+0x0)
    76. 

  76. 

  77. 	jbsr	sun3_init
    78. 

  78. 

  79. 	jbsr	base_trap_init
    80. 

  80. 

  81.         jbsr    start_kernel
    82. 

  82. 	trap	#15
    83. 

  83. 

  84.         .data
    85. 

  85.         .even
    86. 

  86. kpt:
    87. 

  87.         .long 0
    88. 

  88. availmem:
    89. 

  89.         .long 0
    90. 

  90. | todo: remove next two. --m
    91. 

  91. is_medusa:
    92. 

  92.         .long 0
    93. 

  93. m68k_pgtable_cachemode:
    94. 

  94.         .long 0
    95. 

  95. 

  96.