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ipxe/src/arch/i386/prefix/nbiprefix.S

nbiprefix.S 1.7KB
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  1. 	.text

  2. 	.arch i386

  3. 	.code16

  4. 	.section ".prefix", "ax", @progbits

  5. 	.org 0

  6. 

  7. nbi_header:

  8. 	

  9. /*****************************************************************************

  10.  * NBI file header

  11.  *****************************************************************************

  12.  */

  13. file_header:

  14. 	.long	0x1b031336	/* Signature */

  15. 	.byte	0x04		/* 16 bytes header, no vendor info */

  16. 	.byte	0

  17. 	.byte	0

  18. 	.byte	0		/* No flags */

  19. 	.word	0x0000, 0x07c0	/* Load header to 0x07c0:0x0000 */

  20. 	.word	_nbi_start, 0x07c0	/* Start execution at 0x07c0:entry */

  21. 	.size	file_header, . - file_header

  22. 

  23. /*****************************************************************************

  24.  * NBI segment header

  25.  *****************************************************************************

  26.  */

  27. segment_header:

  28. 	.byte	0x04		/* 16 bytes header, no vendor info */

  29. 	.byte	0

  30. 	.byte	0

  31. 	.byte	0x04		/* Last segment */

  32. 	.long	0x00007e00

  33. imglen:	.long	-512

  34. memlen:	.long	-512

  35. 	.size	segment_header, . - segment_header

  36. 

  37. 	.section ".zinfo.fixup", "a", @progbits	/* Compressor fixups */

  38. 	.ascii	"ADDL"

  39. 	.long	imglen

  40. 	.long	1

  41. 	.long	0

  42. 	.ascii	"ADDL"

  43. 	.long	memlen

  44. 	.long	1

  45. 	.long	0

  46. 	.previous

  47. 

  48. /*****************************************************************************

  49.  * NBI entry point

  50.  *****************************************************************************

  51.  */

  52. 	.globl	_nbi_start

  53. _nbi_start:

  54. 	/* Install iPXE */

  55. 	call	install

  56. 

  57. 	/* Set up real-mode stack */

  58. 	movw	%bx, %ss

  59. 	movw	$_estack16, %sp

  60. 

  61. 	/* Jump to .text16 segment */

  62. 	pushw	%ax

  63. 	pushw	$1f

  64. 	lret

  65. 	.section ".text16", "awx", @progbits

  66. 1:

  67. 	pushl	$main

  68. 	pushw	%cs

  69. 	call	prot_call

  70. 	popl	%ecx /* discard */

  71. 

  72. 	/* Uninstall iPXE */

  73. 	call	uninstall

  74. 

  75. 	/* Reboot system */

  76. 	int $0x19

  77. 

  78. 	.previous

  79. 	.size	_nbi_start, . - _nbi_start

  80. 

  81. nbi_header_end:

  82. 	.org 512