rev |
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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@19828
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3 .arch i8086
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pascal@13691
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4 .org 0
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pascal@13691
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5
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pascal@13691
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6 CODESZ = 0x8000 // 16 sectors = 32Kb
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pascal@13972
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7 #define EXEADRS(x) x+0xC0
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pascal@14261
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8 #define EXELOC(x) x-0x40
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pascal@14261
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9 #define EXESTR(x) x-0x7F40
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pascal@13691
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10
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pascal@13691
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11 .globl _start
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pascal@13691
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12 _start:
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pascal@13691
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13 decw %bp // Magic number: MZ
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pascal@13691
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14 popw %dx
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pascal@13972
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15 jmp start0 // Bytes on last page of file
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pascal@13691
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16 .word (CODESZ+511)/512 // Pages in file
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pascal@13691
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17 .word 0 // Relocations
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pascal@13691
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18 .word (end_header-_start)/16 // Size of header in paragraphs
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pascal@13691
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19 .word 4064-(CODESZ/16) // Minimum extra paragraphs needed
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pascal@13691
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20 .word 4064-(CODESZ/16) // Maximum extra paragraphs needed
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pascal@13691
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21 .word 0xFFF0 // Initial (relative) SS value
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pascal@13691
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22 .word 0xFFFE // Initial SP value
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pascal@13691
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23 .word 0 // Checksum
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pascal@13729
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24 .word EXEADRS(exestart) // Initial IP value
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pascal@13691
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25 .word 0xFFF0 // Initial (relative) CS value
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pascal@13972
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26 initramfssize:
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pascal@13972
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27 .word 0 // File address of relocation table
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pascal@17810
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28 fdcnt: // Overlay number
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pascal@14257
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29 .byte 0 // Bootstrap floppy sector count
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pascal@17810
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30 .ascii "slitaz"
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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@17810
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34 moved = 0x8000
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pascal@17496
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35 start0:
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pascal@19827
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36 //pushw %dx // restore %sp
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pascal@19827
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37 //incw %bp // restore %bp
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pascal@17496
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38 xorw %bx, %bx
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pascal@17496
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39 movw %bx, %ds
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pascal@17496
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40 movb $0x7C, %bh
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pascal@19827
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41 pushw %ds
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pascal@19827
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42 popw %ss
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pascal@19827
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43 movw %bx, %sp
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pascal@17496
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44 pushw %bx // return address
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pascal@19827
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45 pushw %di
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pascal@17496
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46 pushw %es // save %es:%di
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pascal@13972
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47 cld
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pascal@17496
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48 sti
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pascal@13972
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49 pushw %ds
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pascal@13972
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50 popw %es
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pascal@13691
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51 call setreg
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pascal@13691
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52 rep
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pascal@19827
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53 movsw
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pascal@13972
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54 movw $0x80, %dx
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pascal@17810
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55 ljmp $0, $moved+start2
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pascal@17810
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56 .byte 0
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pascal@17810
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57 // .org 60
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pascal@17810
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58 // .long 0x0080 // PE header offset
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pascal@17810
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59 .org 64
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pascal@13972
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60 end_header:
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pascal@13972
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61 comstart:
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pascal@13972
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62 .word 0
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pascal@13691
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63
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pascal@17810
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64 .org 66
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pascal@17810
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65 dxloop:
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pascal@17810
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66 start2:
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pascal@17810
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67 call readsector1 // look for the boot device
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pascal@17810
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68 repe
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pascal@17810
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69 cmpsw
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pascal@17810
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70 je dxfound
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pascal@17810
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71 movb $0, %cl // ch = 0
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pascal@17810
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72 addb $0x7D, %dl // try every hard disk
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pascal@17810
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73 jno dxloop
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pascal@17810
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74
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pascal@17810
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75 dxfound:
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pascal@17810
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76 call readsectorX // read isolinux boot sector
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pascal@17810
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77 cmpw (%bx), %cx
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pascal@17810
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78 jnc puts // read fail or no isohydrid boot sector
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pascal@19827
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79 movw $patch,%si
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pascal@17810
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80 popw %es
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pascal@19827
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81 popw %di // isolinux boot needs %es:%di and %dx
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pascal@17810
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82 putsret:
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pascal@17810
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83 ret
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pascal@17810
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84
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pascal@17810
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85 putstrlp:
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pascal@17810
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86 movw $7, %bx
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pascal@17810
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87 movb $0xE, %ah
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pascal@17810
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88 int $0x10
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pascal@17810
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89 error:
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pascal@17810
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90 lodsb
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pascal@17810
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91 cmp $1, %al
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pascal@17810
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92 jg putstrlp
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pascal@17810
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93 jz putsret
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pascal@17810
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94 puts:
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pascal@17810
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95 movb $0x80, %ah
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pascal@17810
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96 xchgw %ax, %si
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pascal@17810
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97 jnc error
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pascal@17810
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98 halt:
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pascal@17810
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99 hlt
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pascal@17810
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100 jmp halt
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pascal@17810
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101 nobsmsg:
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pascal@17810
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102 .asciz "No isolinux."
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pascal@17810
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103
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pascal@17810
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104 .org 0x0080
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pascal@17810
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105 ////////////////////////////// EXE/PE header //////////////////////////////////
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pascal@17810
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106
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pascal@17810
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107 .org 0x01A0
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pascal@17496
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108 readsectorX: // read isolinux boot sector
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pascal@17496
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109 movb $0xA5, %cl // patched by installer
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pascal@13699
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110 readsector1:
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pascal@17496
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111 andb $0x83, %dl // disk and floppy disk
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pascal@13699
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112 movw %cx, (%bx)
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pascal@13699
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113 incw %cx
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pascal@13699
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114 movw $0x201, %ax
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pascal@13699
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115 int $0x13
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pascal@13691
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116 setreg:
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pascal@13699
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117 movw %bx, %si
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pascal@17810
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118 movw $moved, %di
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pascal@13691
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119 movw $0x0100, %cx
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pascal@17810
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120 movb $nobsmsg, %al
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pascal@13691
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121 ret
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pascal@17810
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122 .org 0x01B8
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pascal@14267
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123
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pascal@19827
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124 ////////////////////////// partition boot code ////////////////////////////////
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pascal@19828
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125 // assume CS=DS=SS=0 AH=00 BX=7C00 CX=0100 DL=<drive> SI=7DBE
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pascal@19827
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126
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pascal@19827
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127 .org 0x7C00
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pascal@19827
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128 jmp bootpartition
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pascal@19827
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129 .org 0x7C03
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pascal@19827
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130 .org 0x7DBE
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pascal@19827
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131 table = moved+0x1BE
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pascal@19827
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132 patch:
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pascal@19827
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133 .byte 0,0,0 // head of original bs
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pascal@19827
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134 partcode:
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pascal@19827
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135 popw %di
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pascal@19827
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136 movw $table,%si
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pascal@19827
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137 call movepartition
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pascal@19828
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138 movw $patch-16,%di
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pascal@19827
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139 movb $4,%cl
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pascal@19828
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140 movb $16,%al
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pascal@19827
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141 next:
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pascal@19828
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142 addw %ax,%di
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pascal@19827
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143 cmpb %ch,(%di) // boot flag ?
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pascal@19827
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144 loope next
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pascal@19827
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145 pushw %ds
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pascal@19827
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146 pushw %ds
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pascal@19828
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147 pushw 10(%di)
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pascal@19828
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148 pushw 8(%di)
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pascal@19827
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149 pushw %ds
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pascal@19827
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150 pushw %bx
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pascal@19828
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151 movb $1,%cl
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pascal@19828
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152 pushw %cx
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pascal@19828
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153 pushw %ax
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pascal@19827
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154 movw %sp,%si // assume %ds = %ss
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pascal@19828
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155 pushw %bx
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pascal@19828
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156 cmpw %ax,2(%di) // empty or isolinux partition ?
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pascal@19828
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157 jbe default
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pascal@19827
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158 movb $0x42,%ah
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pascal@19827
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159 int $0x13
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pascal@19827
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160 default:
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pascal@19827
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161 ret
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pascal@19828
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162 .org 0x7DF0
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pascal@19827
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163 bootpartition:
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pascal@19827
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164 pushw %ds
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pascal@19827
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165 popw %es
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pascal@19827
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166 pushw %si
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pascal@19827
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167 movw %bx,%di
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pascal@19827
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168 movsw
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pascal@19827
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169 movsb
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pascal@19828
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170 movw $0x7E00,%di
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pascal@19827
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171 pushw %di
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pascal@19827
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172 movepartition:
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pascal@19828
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173 movb $66,%cl // 0142 and 0042
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pascal@19827
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174 rep
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pascal@19828
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175 movsb
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pascal@19827
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176 ret
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pascal@19827
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177 .org 0x7E00
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pascal@19827
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178
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pascal@17810
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179 .org 0x7F48
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pascal@13691
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180 ////////////////////////////// DOS EXE code ///////////////////////////////////
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pascal@13691
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181
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pascal@13729
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182 exestart:
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pascal@13699
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183 cld
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pascal@19428
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184 movw $EXEADRS(puts), %bp
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pascal@17810
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185 movw 129, %ax
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pascal@17473
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186 cmpb $0x2F, %al
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pascal@17473
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187 je ishelp
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pascal@17473
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188 cmpw $0x2F20, %ax
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pascal@17473
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189 ishelp:
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pascal@17473
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190 movw $0x3000+EXESTR(help), %ax
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pascal@13729
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191 cwd // clear dx
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pascal@17454
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192 pushw %dx // dos exit()
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pascal@17454
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193 je abort
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pascal@17454
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194 int $0x21 // get DOS version
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pascal@17562
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195 addb $-3, %al
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pascal@19435
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196 movw $0xF000+EXESTR(noDOS3), %ax
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pascal@19435
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197 movw $0x100, %di
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pascal@17810
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198 jc tst386
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pascal@13691
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199 abort:
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pascal@19429
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200 jmp *%bp
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pascal@13691
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201
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pascal@17160
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202 tst386:
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pascal@17906
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203 pushfw // save flags
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pascal@17160
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204 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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pascal@17160
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205 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
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pascal@19435
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206 // movb $0xF0, %ah
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pascal@17160
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207 pushw %ax
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pascal@17906
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208 popfw // < 286 : flags[12..15] are forced 1
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pascal@17906
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209 pushfw // = 286 : flags[12..15] are forced 0
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pascal@17906
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210 popw %bx // > 286 : only flags[15] is forced 0
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pascal@17906
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211 popfw // restore flags (IOPL)
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pascal@17906
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212 addb %ah, %bh // test F0 and 00 cases
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pascal@19435
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213 js is86 // NS=386+, NC=286
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pascal@19828
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214 .arch i486
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pascal@13691
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215 is386:
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pascal@17906
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216 smsww %ax // not privileged
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pascal@13691
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217 andb $1, %al
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pascal@17562
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218 movw $10, %si
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pascal@13691
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219 jne tstvcpi
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pascal@17906
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220 movl %cr0, %eax // privileged
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pascal@14150
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221 incl %eax
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pascal@13713
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222 movb $EXESTR(rmPaging), %al
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pascal@14150
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223 js abort
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pascal@17810
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224 inc %ax
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pascal@17810
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225 //movb $EXESTR(realmodemsg), %al
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pascal@13691
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226 realmode:
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pascal@19429
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227 call *%bp
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pascal@19828
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228 .arch i8086
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pascal@17160
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229 is86:
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pascal@14261
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230 movw comstart-end_header(%di), %si // .com address
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pascal@13691
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231 pushw %di
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pascal@17906
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232 movb $0x7C/2, %ch // 31K-31.5K, > com length
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pascal@13691
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233 rep
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pascal@17473
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234 movsw
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pascal@13691
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235 ret
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pascal@13713
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236
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pascal@19828
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237 .arch i486
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pascal@19429
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238 CallVCPI:
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pascal@19428
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239 int $0x67
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pascal@19428
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240 testb %ah, %ah
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pascal@19428
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241 xchgw %ax, %cx
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pascal@19429
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242 pushw %si
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pascal@19428
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243 ScanVCPI:
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pascal@19428
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244 popw %si
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pascal@19428
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245 ChkVCPI:
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pascal@19428
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246 NoVCPI:
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pascal@19428
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247 movb $EXESTR(ERRvcpi), %al
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pascal@19428
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248 jne abort
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pascal@19428
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249 lodsb
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pascal@19428
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250 shlw $8, %ax
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pascal@19428
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251 jne CallVCPI
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pascal@13713
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252 VersionVCPI:
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pascal@17496
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253 xchgw %ax, %si // movb $EXESTR(vm86modemsg), %al
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pascal@17562
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254 cmpb $0x40, %cl // EMM386 / VCPI 4.0 mini
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pascal@17562
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255 jnc realmode // %si = 0
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pascal@13713
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256 tstvcpi:
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pascal@13713
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257 pushw %ds
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pascal@17810
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258 movw %si, %ds // %si = 10
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pascal@17810
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259 movw (0x67*4)+2-(16*10)-0x100(%di), %ds
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pascal@17473
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260 lodsw
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pascal@13713
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261 xorw $0x4D45, %ax // EM(MX) or EM(MQ)
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pascal@17473
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262 lodsw
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pascal@17473
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263 lodsw
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pascal@13713
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264 popw %ds
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pascal@14150
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265 jne NoVCPI
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pascal@19435
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266 xorw $0x5858, %ax // XX(X0)
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pascal@19428
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267 call ScanVCPI
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pascal@13713
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268 CmdVCPI:
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pascal@13713
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269 .byte 0x40 // status
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pascal@13713
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270 .byte 0xDE // vcpi present ?
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pascal@13713
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271 .byte 0x46 // version
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pascal@13713
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272 .byte 0
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pascal@13713
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273
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pascal@17496
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274 vm86modemsg:
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pascal@17473
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275 // --------------- Must be in 7F40 7FFF range ------------------------
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pascal@17810
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276 .ascii "86" // 86 mode
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pascal@17562
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277 .byte EXESTR(mode)
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pascal@14261
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278 ERRvcpi:
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pascal@17810
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279 .ascii "VCPI4" // VCPI4?
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pascal@17562
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280 .byte EXESTR(need)
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pascal@14261
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281 rmPaging:
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pascal@17810
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282 .ascii "X" // Xreal mode
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pascal@14261
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283 realmodemsg:
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pascal@17562
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284 .ascii "real" // real mode
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pascal@17473
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285 // --------------- Must be in 7FC0 7FFF range ------------------------
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pascal@17562
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286 mode:
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pascal@17562
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287 .ascii " m"
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pascal@17496
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288 ode:
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pascal@17562
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289 .ascii "ode"
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pascal@14261
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290 .byte EXESTR(eol)
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pascal@17562
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291 noDOS3:
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pascal@17810
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292 .ascii "DOS3" // DOS3?
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pascal@17562
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293 need:
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pascal@17810
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294 .ascii "?"
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pascal@17496
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295 .byte EXESTR(eol)
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pascal@17473
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296 help:
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pascal@19435
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297 .ascii "SliTaz iso boot." // SliTaz iso boot.
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pascal@17473
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298 eol:
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pascal@17496
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299 .ascii "\r\n"
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pascal@17810
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300 .byte 1 // puts will return
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pascal@14261
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301
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pascal@17496
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302 .space 16,0 // ISO md5
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pascal@14261
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303 .org 0x8000
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pascal@14261
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304 ////////////////////////// ISO9660 header /////////////////////////////////////
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