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linux-phytium
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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. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

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

  3. #include <linux/init.h>
    4. 

  4. 

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

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

  7. #include <asm/contregs.h>
    8. 

  8. #include <asm/sun3-head.h>
    9. 

  9. 

  10. PSL_HIGHIPL     = 0x2700
    11. 

  11. NBSG            = 0x20000
    12. 

  12. ICACHE_ONLY	= 0x00000009
    13. 

  13. CACHES_OFF	= 0x00000008	| actually a clear and disable --m
    14. 

  14. #define MAS_STACK INT_STACK
    15. 

  15. ROOT_TABLE_SIZE = 128
    16. 

  16. PAGESIZE	= 8192
    17. 

  17. SUN3_INVALID_PMEG = 255
    18. 

  18. .globl bootup_user_stack
    19. 

  19. .globl bootup_kernel_stack
    20. 

  20. .globl pg0
    21. 

  21. .globl swapper_pg_dir
    22. 

  22. .globl kernel_pmd_table
    23. 

  23. .globl availmem
    24. 

  24. .global m68k_pgtable_cachemode
    25. 

  25. .global kpt
    26. 

  26. | todo: all these should be in bss!
    27. 

  27. swapper_pg_dir:                .skip 0x2000
    28. 

  28. pg0:                           .skip 0x2000
    29. 

  29. kernel_pmd_table:              .skip 0x2000
    30. 

  30. 

  31. .globl kernel_pg_dir
    32. 

  32. .equ    kernel_pg_dir,kernel_pmd_table
    33. 

  33. 

  34. 	__HEAD
    35. 

  35. ENTRY(_stext)
    36. 

  36. ENTRY(_start)
    37. 

  37. 

  38. /* Firstly, disable interrupts and set up function codes. */
    39. 

  39. 	movew	#PSL_HIGHIPL, %sr
    40. 

  40. 	moveq	#FC_CONTROL, %d0
    41. 

  41. 	movec	%d0, %sfc
    42. 

  42. 	movec	%d0, %dfc
    43. 

  43. 

  44. /* Make sure we're in context zero. */
    45. 

  45. 	moveq	#0, %d0
    46. 

  46. 	movsb	%d0, AC_CONTEXT
    47. 

  47. 

  48. /* map everything the bootloader left us into high memory, clean up the
    49. 

  49.    excess later */
    50. 

  50. 	lea	(AC_SEGMAP+0),%a0
    51. 

  51. 	lea	(AC_SEGMAP+KERNBASE),%a1
    52. 

  52. 1:
    53. 

  53. 	movsb	%a0@, %d1
    54. 

  54. 	movsb	%d1, %a1@
    55. 

  55. 	cmpib	#SUN3_INVALID_PMEG, %d1
    56. 

  56. 	beq	2f
    57. 

  57. 	addl	#NBSG,%a0
    58. 

  58. 	addl	#NBSG,%a1
    59. 

  59. 	jmp	1b
    60. 

  60. 

  61. 2:
    62. 

  62. 

  63. /* Disable caches and jump to high code. */
    64. 

  64. 	moveq	#ICACHE_ONLY,%d0	| Cache disabled until we're ready to enable it
    65. 

  65. 	movc	%d0, %cacr	|   is this the right value? (yes --m)
    66. 

  66. 	jmp	1f:l
    67. 

  67. 

  68. /* Following code executes at high addresses (0xE000xxx). */
    69. 

  69. 1:	lea	init_task,%curptr			| get initial thread...
    70. 

  70. 	lea	init_thread_union+THREAD_SIZE,%sp	| ...and its stack.
    71. 

  71. 

  72. /* Point MSP at an invalid page to trap if it's used. --m */
    73. 

  73. 	movl	#(PAGESIZE),%d0
    74. 

  74. 	movc	%d0,%msp
    75. 

  75. 	moveq	#-1,%d0
    76. 

  76. 	movsb	%d0,(AC_SEGMAP+0x0)
    77. 

  77. 

  78. 	jbsr	sun3_init
    79. 

  79. 

  80. 	jbsr	base_trap_init
    81. 

  81. 

  82.         jbsr    start_kernel
    83. 

  83. 	trap	#15
    84. 

  84. 

  85.         .data
    86. 

  86.         .even
    87. 

  87. kpt:
    88. 

  88.         .long 0
    89. 

  89. availmem:
    90. 

  90.         .long 0
    91. 

  91. | todo: remove next two. --m
    92. 

  92. is_medusa:
    93. 

  93.         .long 0
    94. 

  94. m68k_pgtable_cachemode:
    95. 

  95.         .long 0
    96. 

  96. 

  97.