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 entry, 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 entry: 53 /* Install gPXE */ 54 call install 55 56 /* Jump to .text16 segment */ 57 pushw %ax 58 pushw $1f 59 lret 60 .section ".text16", "awx", @progbits 61 1: 62 pushl $main 63 pushw %cs 64 call prot_call 65 popl %ecx /* discard */ 66 67 /* Uninstall gPXE */ 68 call uninstall 69 70 /* Reboot system */ 71 int $0x19 72 73 .previous 74 .size entry, . - entry 75 76 nbi_header_end: 77 .org 512 78
