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pascal@13691
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1 .text
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pascal@13691
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2 .code16
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pascal@13691
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3 .org 0
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pascal@13691
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4
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pascal@13691
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5 CODESZ = 0x8000 // 16 sectors = 32Kb
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pascal@13972
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6 #define EXEADRS(x) x+0xC0
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pascal@14261
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7 #define EXELOC(x) x-0x40
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pascal@14261
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8 #define EXESTR(x) x-0x7F40
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pascal@13691
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9
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pascal@13691
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10 .globl _start
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pascal@13691
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11 _start:
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pascal@13691
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12 decw %bp // Magic number: MZ
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pascal@13691
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13 popw %dx
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pascal@13972
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14 jmp start0 // Bytes on last page of file
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pascal@13691
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15 .word (CODESZ+511)/512 // Pages in file
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pascal@13691
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16 .word 0 // Relocations
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pascal@13691
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17 .word (end_header-_start)/16 // Size of header in paragraphs
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pascal@13691
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18 .word 4064-(CODESZ/16) // Minimum extra paragraphs needed
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pascal@13691
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19 .word 4064-(CODESZ/16) // Maximum extra paragraphs needed
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pascal@13691
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20 .word 0xFFF0 // Initial (relative) SS value
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pascal@13691
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21 .word 0xFFFE // Initial SP value
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pascal@13691
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22 .word 0 // Checksum
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pascal@13729
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23 .word EXEADRS(exestart) // Initial IP value
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pascal@13691
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24 .word 0xFFF0 // Initial (relative) CS value
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pascal@13972
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25 initramfssize:
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pascal@13972
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26 .word 0 // File address of relocation table
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pascal@13972
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27 id:
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pascal@13691
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28 .word 0 // Overlay number
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pascal@14257
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29 fdcnt:
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pascal@14257
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30 .byte 0 // Bootstrap floppy sector count
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pascal@13691
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31
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pascal@13691
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32 /////////////////////// Master Boot Record code //////////////////////////////
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pascal@13691
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33
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pascal@13972
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34 start0: // File address of relocation table
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pascal@13691
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35 pushw %dx // restore SP
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pascal@13972
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36 incw %bp // restore %bp
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pascal@13713
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37 pushw $0
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pascal@13713
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38 popw %ds
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pascal@13713
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39 movw $0x7C00, %bx
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pascal@13713
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40 pushfw
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pascal@13713
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41 pushw %ds
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pascal@13713
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42 pushw %bx
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pascal@13691
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43 pushaw
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pascal@13691
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44 movw %sp, %bp
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pascal@13691
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45 pushw %es
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pascal@13972
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46 cld
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pascal@13972
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47 pushw %ds
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pascal@13972
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48 popw %es
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pascal@13691
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49 call setreg
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pascal@13691
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50 rep
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pascal@13691
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51 movsw
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pascal@13972
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52 movw $0x80, %dx
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pascal@13691
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53 ljmp $0, $0x0600+start2
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pascal@13972
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54
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pascal@13972
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55 .org 60
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pascal@14261
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56 .long 0x0080 // PE header offset
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pascal@13972
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57 end_header:
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pascal@13972
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58 chksum:
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pascal@13972
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59 .word 0
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pascal@13972
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60 comstart:
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pascal@13972
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61 .word 0
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pascal@13691
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62
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pascal@14261
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63 readsectorX:
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pascal@14261
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64 movb $0, %cl
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pascal@13699
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65 readsector1:
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pascal@13699
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66 movw %cx, (%bx)
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pascal@13699
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67 incw %cx
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pascal@13699
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68 movw $0x201, %ax
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pascal@13699
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69 int $0x13
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pascal@13691
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70 setreg:
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pascal@13699
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71 movw %bx, %si
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pascal@13691
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72 movw $0x0600, %di
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pascal@13691
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73 movw $0x0100, %cx
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pascal@13691
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74 return:
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pascal@13691
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75 ret
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pascal@13691
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76 start2:
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pascal@13691
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77 dxloop:
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pascal@13699
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78 call readsector1
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pascal@13691
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79 repe
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pascal@13691
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80 cmpsw
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pascal@13691
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81 je dxfound
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pascal@13691
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82 next:
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pascal@13699
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83 xorw %cx, %cx
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pascal@13699
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84 xchgw %ax, %dx
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pascal@13699
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85 addb $0x7D, %al // try every hard disk
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pascal@13699
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86 andb $0x83, %al // and floppy disk
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pascal@13699
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87 cmpb $0x80, %al
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pascal@13699
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88 xchgw %ax, %dx
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pascal@13691
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89 jnz dxloop
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pascal@13691
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90 dxfound:
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pascal@13691
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91 movw %dx, 10(%bp)
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pascal@14267
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92 call checkboot
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pascal@14267
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93 noboot:
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pascal@14267
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94 .ascii "No isolinux mbr."
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pascal@14267
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95 noboot_end:
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pascal@14267
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96
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pascal@14267
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97 .org 0x0080
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pascal@14267
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98 ////////////////////////////// EXE/PE header //////////////////////////////////
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pascal@14267
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99
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pascal@14267
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100 .org 0x01A0
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pascal@14267
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101 checkboot:
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pascal@14261
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102 call readsectorX
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pascal@13699
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103 lodsw
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pascal@14267
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104 popw %si
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pascal@13713
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105 shrw $1, %ax
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pascal@14267
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106 jz error // read fail or not isohydrid
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pascal@13691
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107 popw %es
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pascal@13691
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108 popa
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pascal@13713
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109 iret
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pascal@13691
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110
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pascal@14267
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111 error:
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pascal@14267
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112 movw $noboot_end-noboot, %cx
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pascal@14267
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113 putsloop:
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pascal@14267
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114 lodsb
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pascal@14267
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115 movw $7, %bx
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pascal@14267
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116 movb $0xE, %ah
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pascal@14267
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117 int $0x10
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pascal@14267
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118 loop putsloop
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pascal@14267
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119 halt:
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pascal@14267
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120 hlt
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pascal@14267
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121 jmp halt
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pascal@14267
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122 .org 0x01BE
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pascal@14261
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123
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pascal@14261
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124 .org 0x7EE0
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pascal@13691
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125 ////////////////////////////// DOS EXE code ///////////////////////////////////
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pascal@13691
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126
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pascal@13729
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127 exestart:
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pascal@13699
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128 cld
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pascal@13697
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129 movw $0x100, %si
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pascal@13713
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130 movw -127(%si), %ax
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pascal@13729
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131 cwd // clear dx
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pascal@13713
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132 pushw %dx // dos exit
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pascal@13713
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133 cmpw $0x2F20, %ax
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pascal@13729
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134 movw $0x1000+EXESTR(help), %ax
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pascal@13691
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135 je abort
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pascal@13729
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136 pushfw // save flags
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pascal@13729
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137 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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pascal@13729
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138 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
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pascal@13729
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139 // movb $0x10, %ah
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pascal@13729
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140 pushw %ax
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pascal@13729
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141 popfw // < 286 : flags[12..15] are forced 1
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pascal@13729
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142 pushfw // = 286 : flags[12..15] are forced 0
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pascal@13729
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143 popw %cx // > 286 : only flags[15] is forced 0
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pascal@13729
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144 popfw // restore flags
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pascal@13729
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145 addb %ah, %ch // test F0 and 00 cases
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pascal@13729
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146 cmpb %ah, %ch
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pascal@13729
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147 movb $EXESTR(no386), %al
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pascal@13729
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148 jbe abort // C=8086/80186, Z=80286
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pascal@13729
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149 #if 1
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pascal@13697
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150 movw (%si), %cx
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pascal@13729
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151 jcxz is386
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pascal@13729
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152 #endif
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pascal@14261
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153 movw $(EXELOC(0x8000))/2, %cx
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pascal@13697
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154 chklp:
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pascal@13697
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155 lodsw
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pascal@13697
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156 addw %ax, %dx
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pascal@13697
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157 loop chklp
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pascal@13713
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158 movb $EXESTR(chkerr), %al
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pascal@13729
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159 je is386 // dx == 0 ?
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pascal@13691
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160 abort:
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pascal@13691
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161 puts:
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pascal@14261
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162 movb $0x80, %ah
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pascal@13713
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163 xchgw %ax, %si
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pascal@13713
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164 putslp:
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pascal@13713
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165 lodsb
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pascal@13713
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166 orb %al, %al
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pascal@13713
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167 jz moveret
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pascal@13713
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168 js puts
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pascal@13713
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169 movw $7, %bx
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pascal@13713
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170 movb $0xE, %ah
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pascal@13713
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171 int $0x10
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pascal@13713
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172 jmp putslp
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pascal@13691
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173
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pascal@13691
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174 is386:
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pascal@13697
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175 movl %cr0, %eax
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pascal@13691
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176 andb $1, %al
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pascal@13691
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177 jne tstvcpi
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pascal@14150
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178 incl %eax
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pascal@13713
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179 movb $EXESTR(rmPaging), %al
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pascal@14150
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180 js abort
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pascal@13713
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181 movb $EXESTR(realmodemsg), %al
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pascal@13691
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182 realmode:
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pascal@13691
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183 call puts
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pascal@13699
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184 movb $0x30, %ah
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pascal@13699
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185 int $0x21
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pascal@13699
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186 cmpb $3, %al
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pascal@13713
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187 movb $EXESTR(noDOS3), %al
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pascal@13713
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188 jb abort
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pascal@13691
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189 movw $0x0100, %di
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pascal@14261
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190 movw comstart-end_header(%di), %si // .com address
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pascal@13691
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191 pushw %di
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pascal@14261
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192 movb $0x7D, %ch
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pascal@13691
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193 rep
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pascal@13691
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194 movsb
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pascal@13713
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195 moveret:
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pascal@13691
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196 ret
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pascal@13713
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197
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pascal@13713
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198 VersionVCPI:
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pascal@13713
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199 cmpb $0x40, %dl // >= 4.0 ?
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pascal@13713
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200 jb NoVCPI
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pascal@13713
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201 movb $EXESTR(vm86modemsg), %al
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pascal@13713
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202 jmp realmode
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pascal@13713
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203 tstvcpi:
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pascal@13713
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204 pushw %ds
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pascal@13713
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205 movw %cx, %ds // %cx = 0
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pascal@13713
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206 movw 0x67*4+2, %ds
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pascal@13713
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207 movw $10, %si
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pascal@14150
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208 lodsl
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pascal@13713
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209 xorw $0x4D45, %ax // EM(MX) or EM(MQ)
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pascal@14150
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210 lodsl
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pascal@13713
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211 popw %ds
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pascal@14150
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212 jne NoVCPI
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pascal@14150
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213 xorl $0x30585858, %eax // XXX0
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pascal@13713
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214 movw $EXEADRS(CmdVCPI), %si
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pascal@13713
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215 ChkVCPI:
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pascal@13713
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216 NoVCPI:
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pascal@13713
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217 movb $EXESTR(ERRvcpi), %al
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pascal@13713
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218 jne abort
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pascal@13713
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219 lodsb
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pascal@13713
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220 shlw $8, %ax
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pascal@13713
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221 je VersionVCPI
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pascal@13713
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222 int $0x67
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pascal@13713
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223 testb %ah, %ah
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pascal@14150
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224 xchgw %ax, %dx
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pascal@13713
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225 jmp ChkVCPI
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pascal@13713
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226 CmdVCPI:
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pascal@13713
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227 .byte 0x40 // status
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pascal@13713
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228 .byte 0xDE // vcpi present ?
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pascal@13713
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229 .byte 0x46 // version
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pascal@13713
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230 .byte 0
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pascal@13713
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231
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pascal@14261
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232 // -------------------------------------------------------------------
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pascal@13691
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233
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pascal@14261
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234 help:
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pascal@14261
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235 .ascii "SliTaz GNU/L" // SliTaz GNU/Linux boot loader
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pascal@14261
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236 .byte EXESTR(iloader)
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pascal@14261
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237 no386:
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pascal@14261
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238 .ascii "No 386" // No 386+
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pascal@14261
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239 .byte EXESTR(plus)
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pascal@14261
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240 ERRvcpi:
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pascal@14261
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241 .ascii "No EMM386/VCPI 4" // No EMM386/VCPI 4.0+
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pascal@14261
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242 .byte EXESTR(dot0)
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pascal@14261
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243 chkerr:
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pascal@14261
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244 .ascii "Broken ISO image fil" // Broken ISO image file.
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pascal@14261
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245 .byte EXESTR(eeol)
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pascal@14261
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246 vm86modemsg:
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pascal@14261
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247 .ascii "vm86" // vm86 mode.
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pascal@14261
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248 .byte EXESTR(mode)
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pascal@14261
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249 rmPaging:
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pascal@14261
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250 .ascii "Invalid: paging + " // Invalid: paging + real mode.
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pascal@14261
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251 realmodemsg:
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pascal@14261
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252 .ascii "real" // real mode.
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pascal@14261
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253 // --------------- Must be in 00C0 013F range ------------------------
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pascal@14261
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254 mode:
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pascal@14261
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255 .ascii " mod"
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pascal@14261
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256 eeol:
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pascal@14261
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257 .ascii "e"
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pascal@14261
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258 .byte EXESTR(eol)
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pascal@14261
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259 //noloader:
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pascal@14261
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260 // .ascii "No isol" // No isolinux boot loader
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pascal@14261
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261 iloader:
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pascal@14261
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262 .ascii "inux boot loader"
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pascal@14261
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263 eol:
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pascal@14261
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264 .ascii "."
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pascal@14261
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265 eol2:
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pascal@14261
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266 .asciz "\r\n"
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pascal@14261
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267 noDOS3:
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pascal@14261
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268 .ascii "No DOS 3" // No DOS 3.0+
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pascal@14261
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269 dot0:
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pascal@14261
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270 .ascii ".0"
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pascal@14261
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271 plus:
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pascal@14261
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272 .ascii "+"
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pascal@14261
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273 .byte EXESTR(eol2)
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pascal@14261
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274
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pascal@14261
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275 .org 0x8000
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pascal@14261
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276 ////////////////////////// ISO9660 header /////////////////////////////////////
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pascal@14261
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277
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