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ipxe/src/arch/e1/core/start.S

start.S 2.6KB
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  1. /*

  2.  * Derived from the Hyperstone's library source code.

  3.  * Copyright (C) 2002-2003 GDT, Yannis Mitsos <gmitsos@telecom.ntua.gr>

  4.  *                              George Thanos <gthanos@telecom.ntua.gr>

  5.  */    

  6. 	.global	Priority	; Task-Priority

  7. 	.global	_Stack1Size	; Size of hardware stack

  8. 	.global	_Stack2Size	; Size of aggregate stack

  9. 	.global	_Stack1Base	; Base of hardware stack

  10. 	.global	_Stack2Base	; Base of aggregate stack

  11. 	.global	_Mem0HeapBase	; Base of Heap in Mem0

  12. 	.global	_Mem1HeapBase	; Base of Heap in Mem1

  13. 

  14. 	.global _init_peripherals

  15. 	.global	_main

  16. 	.global	Main

  17. 

  18. 	.global	__exit

  19. 	.global	__fmode

  20. 	.global	__MaxArgCount

  21. 

  22. 	.text

  23. BasePtrs:

  24. 	.weak	G6Base,G7Base,G8Base,G9Base,G10Base,G11Base,G12Base,G13Base

  25. 	.long	G6Base,G7Base,G8Base,G9Base,G10Base,G11Base,G12Base,G13Base

  26. BasePtrsEnd:

  27. HeapPtrs:

  28. 	.long	_Mem0HeapBase

  29. 	.long	_Mem1HeapBase

  30. HeapPtrsEnd:

  31. 

  32. __MaxArgCount:

  33.         .long	32

  34. __StandAloneMode:

  35. 	.long	0		; 0 indicate stand alone mode

  36. 

  37. ;============================================================================;

  38. ; Startup-Code                                                               ;

  39. ;============================================================================;

  40. 	.data

  41. 

  42. ; do not change the order of: __argc,..

  43. __argc:	

  44. 	.long  0

  45. __argv:	

  46. 	.long  0

  47. __IsShell:

  48. 	.long  1

  49. ErrorLevel:

  50. 	.long  0

  51. __lab:	

  52. 	.long  0

  53. __fmode:

  54. 	.long	0x4000		; O_TEXT    attribute

  55. 

  56. _isa_drivers:

  57. 	.long	0

  58. 

  59. _isa_drivers_end:

  60. 	.long	0

  61. 

  62. 

  63. 	.text

  64. Main:

  65. StartUp:

  66. 	FRAME	L5, L0

  67. 	MOVI	L2, __bss_start__	; clear the .bss segment

  68. 0:	CMPI	L2, __bss_end__

  69. 	BHE	0f

  70. 	DBR	0b

  71. 	STW.P	L2, 0

  72. 0:	SUM     L2, PC, BasePtrs-$	; Load BasePtrs G6-G13

  73. 	LDD.P   L2, G6

  74. 	LDD.P   L2, G8

  75. ;	LDD.P   L2, G10

  76. 	LDD.P   L2, G12

  77. 	MOVI    L2, 1

  78. 	SUM     L3, PC, __StandAloneMode-$

  79. 	STW.R   L3, L2

  80. 

  81. 	;----------------------------------------------------------------;

  82. 	; Call main C function                                           ;

  83. 	;----------------------------------------------------------------;

  84. 2:	LDW.D	PC, L2, __argc - $	; pass count of arguments to main

  85. 	LDW.D   PC, L3, __argv - $	; pass pointer array to main

  86. 	CALL	L4, PC, _init_peripherals - $ 

  87. 	CALL    L4, PC, _main - $	; --> Call Main-Program

  88. 	CHK     PC, PC			; trap if execution arrives here

  89. 

  90. __exit:

  91. 	FRAME   L5, L1

  92. 	STW.D   PC, L0, ErrorLevel - $	; Store ERRORLEVEL

  93. 

  94. 	CHK     PC, PC

  95. 	RET     PC, L1

  96. 

  97. 	.global ___main

  98. ___main:

  99. 	FRAME   L4, L1

  100. 	MOVI    L3, 2

  101. 	STW.D   PC, L3, __StandAloneMode-$

  102. 	RET     PC, L1		; does not return

  103. 

  104. 	.section _GOT_

  105. 	.long   Main+4		; OnCreate

  106. 	.long   Main+8		; OnError

  107. 	.long   BasePtrs	; G6

  108. 	.long   BasePtrs+4	; G7

  109. 	.long   BasePtrs+8	; G8

  110. 	

  111. 	.END