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

nbiprefix.S 1.5KB
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  1. 	.text

  2. 	.arch i386

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

  4. 	.section ".prefix.data", "aw", @progbits

  5. 	.code16

  6. 	.section ".prefix"

  7. 	.org 0

  8. 

  9. nbi_header:

  10. 	

  11. /*****************************************************************************

  12.  * NBI file header

  13.  *****************************************************************************

  14.  */

  15. file_header:

  16. 	.long	0x1b031336	/* Signature */

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

  18. 	.byte	0

  19. 	.byte	0

  20. 	.byte	0		/* No flags */

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

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

  23. 	.size	file_header, . - file_header

  24. 

  25. /*****************************************************************************

  26.  * NBI segment header

  27.  *****************************************************************************

  28.  */

  29. segment_header:

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

  31. 	.byte	0

  32. 	.byte	0

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

  34. 	.long	0x00007e00

  35. 	.long	_load_size - 512

  36. 	.long	_load_size - 512

  37. 	.size	segment_header, . - segment_header

  38. 

  39. /*****************************************************************************

  40.  * NBI entry point

  41.  *****************************************************************************

  42.  */

  43. entry:

  44. 	/* Install low and high memory regions */

  45. 	call	install

  46. 

  47. 	/* Jump to .text16 segment */

  48. 	pushw	%ax

  49. 	pushw	$1f

  50. 	lret

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

  52. 1:

  53. 	pushl	$main

  54. 	pushw	%cs

  55. 	call	prot_call

  56. 	popl	%eax /* discard */

  57. 

  58. 	/* Reboot system */

  59. 	int $0x19

  60. 

  61. 	.previous

  62. 	.size	entry, . - entry

  63. 

  64. nbi_header_end:

  65. 	.org 512