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pascal@19515
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1 ;***************************************************************
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pascal@19515
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2 ;****** This file is distributed under GPL
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pascal@19515
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3 ;***************************************************************
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pascal@19515
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4 ideal
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pascal@19515
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5 %crefref
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pascal@19515
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6 %noincl
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pascal@19515
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7 %nomacs
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pascal@19636
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8 ifdef NO386
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pascal@19636
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9 p8086
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pascal@19636
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10 else
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pascal@19515
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11 p386
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pascal@19636
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12 endif
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pascal@19515
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13
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pascal@19903
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14 group DGROUP _TEXT,_DATA,_BSS
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pascal@19515
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15 assume cs:DGROUP,ds:DGROUP
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pascal@19515
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16
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pascal@19903
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17 segment _DATA byte public use16 'DATA'
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pascal@19903
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18
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pascal@19903
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19 overflow db "Loaded too close to 9000:0",0
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pascal@19903
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20
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pascal@19903
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21 ends _DATA
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pascal@19903
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22
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pascal@19515
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23 segment _BSS byte public use16 'BSS'
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pascal@19515
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24
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pascal@19899
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25 global _imgs:dword
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pascal@19515
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26
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pascal@19515
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27 ends _BSS
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pascal@19515
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28
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pascal@19515
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29
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pascal@19515
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30 segment _TEXT byte public use16 'CODE'
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pascal@19515
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31
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pascal@19905
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32 ;***************************************************************
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pascal@19905
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33 ;void boot_kernel();
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pascal@19905
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34 ;****** Never returns
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pascal@19905
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35 ;***************************************************************
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pascal@19903
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36 global _boot_kernel:near
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pascal@19905
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37 proc _boot_kernel near
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pascal@19905
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38
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pascal@19903
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39 ; Shrink stack: we won't need much of it now and have no malloc() plans
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pascal@19903
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40 extrn _heap_top:word
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pascal@19903
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41 mov ax,[_heap_top]
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pascal@19903
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42 inc ah
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pascal@19903
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43 cmp ax,sp
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pascal@19905
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44 ja @@samesp
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pascal@19903
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45 xchg ax,sp
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pascal@19905
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46 @@samesp:
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pascal@19903
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47 ifdef NO386
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pascal@19903
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48 extrn _topseg:near
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pascal@19903
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49 call near _topseg
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pascal@19903
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50 mov es,ax
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pascal@19903
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51 xchg ax,bx
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pascal@19903
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52 mov cl,4
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pascal@19903
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53 mov ax,sp
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pascal@19903
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54 shr ax,cl
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pascal@19903
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55 else
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pascal@19903
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56 mov bx,9000h
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pascal@19903
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57 mov es,bx
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pascal@19903
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58 mov ax,sp
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pascal@19903
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59 shr ax,4
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pascal@19903
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60 endif
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pascal@19903
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61 mov dx,cs
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pascal@19903
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62 add ax,dx
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pascal@19903
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63 cmp ax,bx
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pascal@19905
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64 jb @@nooverflow
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pascal@19903
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65 ; Oops! We can stomp on our toes... better stop now
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pascal@19903
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66 mov bx,offset overflow
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pascal@19903
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67 extrn die:near
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pascal@19903
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68 jmp near die
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pascal@19905
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69 @@nooverflow:
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pascal@19636
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70 cli ; we start doing destructive things to DOS
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pascal@19571
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71 push es
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pascal@19571
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72 pop ss
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pascal@19571
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73 mov sp,0A000h
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pascal@19900
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74 extrn _csip:dword
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pascal@19900
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75 push [dword _csip]
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pascal@19636
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76 extrn _rm_size:word
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pascal@19636
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77 mov si,offset _rm_size ; _rm_size, _pm_high, _rm_buf
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pascal@19636
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78 lodsw
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pascal@19636
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79 xchg ax,cx ; _rm_size
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pascal@19636
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80 lodsb ; _pm_high
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pascal@19636
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81 mov si,[si] ; _rm_buf
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pascal@19571
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82 xor di,di
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pascal@19571
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83 ;cld
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pascal@19571
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84 rep
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pascal@19571
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85 movsb
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pascal@19571
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86 extrn _cmdline:word
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pascal@19571
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87 mov si,[_cmdline]
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pascal@19571
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88 mov di,8000h
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pascal@19571
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89 mov ch,10h ; 4k
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pascal@19571
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90 rep
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pascal@19571
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91 movsb
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pascal@19636
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92 cmp al,cl ; load high ?
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pascal@19905
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93 jne @@isbzimage
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pascal@19637
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94 ifdef NO386
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pascal@19637
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95 add bh,9
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pascal@19637
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96 push bx ; topseg()+0x0900
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pascal@19637
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97 else
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pascal@19905
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98 push 9800h+(4096/16) ; 4096 bytes for cmdline
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pascal@19637
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99 endif
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pascal@19515
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100 ; finish loading
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pascal@19515
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101 extrn @last_ditch$qv:near
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pascal@19515
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102 push cs
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pascal@19515
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103 call @last_ditch$qv
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pascal@19899
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104 mov ax,[word _imgs+2+2] ; get pm->fallback high word
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pascal@19515
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105 ; self move
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pascal@19571
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106 ;cld
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pascal@19538
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107 pop es ; min 2048 bytes for stack
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pascal@19538
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108 xor si,si ; A000 -9000 -0800(>movedend)
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pascal@19515
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109 xor di,di ; set ZF
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pascal@19538
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110 mov cx,offset movedend
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pascal@19515
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111 rep
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pascal@19515
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112 movsb
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pascal@19515
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113 push es
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pascal@19905
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114 call near @@doretf ; mov cs,es
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pascal@19571
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115 push ss
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pascal@19571
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116 pop es
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pascal@19515
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117 push cs
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pascal@19515
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118 pop ds
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pascal@19571
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119 push ax
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pascal@19905
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120 extrn dos_shutdown:near
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pascal@19515
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121 call near dos_shutdown
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pascal@19538
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122 ;in al,70h
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pascal@19538
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123 ;or al,80h ; disable NMI
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pascal@19538
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124 ;out 70h,al
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pascal@19538
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125 pop bx
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pascal@19515
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126 ; move zImage pm
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pascal@19515
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127 mov ax,8
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pascal@19900
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128 cwd ; clear dx
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pascal@19515
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129 cmp bx,ax
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pascal@19905
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130 ja @@bufhigh
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pascal@19515
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131 sub ax,bx
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pascal@19515
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132 inc ax
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pascal@19905
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133 @@bufhigh:
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pascal@19515
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134 push ax
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pascal@19515
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135 push dx ; size=up to 512k
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pascal@19515
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136 push bx ; src ofs= pm.fallback
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pascal@19515
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137 push dx
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pascal@19515
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138 push dx ; srcseg=0
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pascal@19636
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139 ifdef NO386
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pascal@19636
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140 inc dx
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pascal@19636
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141 push dx ; dst
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pascal@19636
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142 dec dx
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pascal@19636
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143 else
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pascal@19636
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144 push 1 ; dst
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pascal@19636
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145 endif
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pascal@19515
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146 push dx ; ofs=64k
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pascal@19515
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147 extrn _memcpy32:near
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pascal@19515
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148 call _memcpy32
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pascal@19538
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149 add sp,14
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pascal@19515
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150
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pascal@19515
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151 ifndef noelks
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pascal@19515
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152 push ss
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pascal@19515
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153 pop ds
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pascal@19515
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154 ifndef NO386
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pascal@19515
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155 cmp [dword 1E6h],'SKLE'
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pascal@19515
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156 else
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pascal@19515
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157 cmp [word 1E6h],'LE'
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pascal@19905
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158 jne @@notelks
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pascal@19515
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159 cmp [word 1E8h],'SK'
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pascal@19515
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160 endif
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pascal@19905
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161 jne @@notelks
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pascal@19636
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162 ifdef NO386
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pascal@19636
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163 mov cx,120h
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pascal@19636
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164 push cx
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pascal@19636
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165 mov cl,0h
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pascal@19636
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166 push cx
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pascal@19636
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167 else
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pascal@19636
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168 push 120h
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pascal@19515
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169 push 100h
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pascal@19636
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170 endif
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pascal@19515
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171 pop es
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pascal@19515
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172 xor si,si
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pascal@19515
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173 xor di,di
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pascal@19515
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174 mov ch,05h
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pascal@19515
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175 rep
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pascal@19515
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176 movsw
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pascal@19515
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177 push es
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pascal@19515
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178 pop ss
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pascal@19636
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179 push cx
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pascal@19905
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180 @@notelks:
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pascal@19515
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181 endif
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pascal@19905
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182 @@isbzimage:
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pascal@19515
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183 push ss
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pascal@19515
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184 pop ds
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pascal@19571
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185 ;push ss
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pascal@19571
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186 ;pop es
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pascal@19636
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187 ifndef NO386
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pascal@19515
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188 push ss
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pascal@19515
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189 pop fs
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pascal@19515
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190 push ss
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pascal@19515
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191 pop gs
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pascal@19636
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192 endif
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pascal@19515
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193 assume nothing
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pascal@19515
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194 assume cs:DGROUP
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pascal@19905
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195 @@doretf:
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pascal@19515
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196 retf
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pascal@19515
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197
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pascal@19515
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198 movedend:
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pascal@19905
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199 endp _boot_kernel
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pascal@19515
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200
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pascal@19515
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201 ends _TEXT
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pascal@19515
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202
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pascal@19515
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203 end
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pascal@19515
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204
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pascal@19515
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205 ;###### END OF FILE ############################################
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