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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@19515
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8 p386
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pascal@19515
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9
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pascal@19515
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10 group DGROUP _TEXT,_DATA,_BSS
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pascal@19515
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11 assume cs:DGROUP,ds:DGROUP
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pascal@19515
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12
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pascal@19515
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13 segment _TEXT byte public use16 'CODE'
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pascal@19515
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14
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pascal@19515
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15 org 100h
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pascal@19515
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16 global _text_start:byte
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pascal@19515
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17 label _text_start byte
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pascal@19546
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18
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pascal@19515
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19 ;***************************************************************
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pascal@19515
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20 ; clear bss
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pascal@19515
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21 ;***************************************************************
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pascal@19546
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22 mov bx,offset _bss_start
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pascal@19515
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23 clearbss:
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pascal@19546
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24 mov [byte bx],0 ; clear bss + heap + sp
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pascal@19546
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25 inc bx
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pascal@19546
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26 jne clearbss
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pascal@19571
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27 cld
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pascal@19546
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28
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pascal@19546
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29 ;***************************************************************
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pascal@19546
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30 ; check CPU
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pascal@19546
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31 ;***************************************************************
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pascal@19546
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32
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pascal@19546
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33 ; Check for oldies
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pascal@19546
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34 mov bh, 0F0h
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pascal@19546
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35 pushf
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pascal@19546
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36 push bx ; < 286 : flags[12..15] are forced 1
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pascal@19546
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37 popf ; = 286 : flags[12..15] are forced 0
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pascal@19546
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38 pushf ; > 286 : only flags[15] is forced 0
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pascal@19546
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39 pop dx
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pascal@19546
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40 popf
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pascal@19546
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41 add dh,bh ; NS=386+, NC=286
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pascal@19571
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42 mov bx,offset msg_badcpu
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pascal@19546
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43 ifndef NO386
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pascal@19546
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44 js no_vcpi ;it is a 86/186/286, not a 386+
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pascal@19546
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45 else
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pascal@19546
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46 js endcpu
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pascal@19546
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47 endif
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pascal@19546
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48 ; Check for vm
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pascal@19546
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49 smsw ax ;SMSW cannot be trapped! :-)
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pascal@19571
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50 and al,1 ;MSW_PE
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pascal@19546
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51 ; We're in vm
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pascal@19571
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52 jz check_rm_paging
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pascal@19546
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53
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pascal@19546
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54 ;***************************************************************
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pascal@19546
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55 ; checks for vcpi
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pascal@19546
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56 ;***************************************************************
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pascal@19546
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57 label check_vcpi near
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pascal@19546
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58 push ds
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pascal@19546
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59 ; Check whether it is safe to call 67h (we trust only known EMM managers)
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pascal@19546
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60 push 0
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pascal@19546
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61 pop ds
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pascal@19546
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62 mov ds,[word 67h*4+2]
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pascal@19546
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63 cmp [dword 10+4],'0XXX'
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pascal@19546
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64 jne skip
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pascal@19546
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65 mov eax,'XMME'
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pascal@19546
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66 xor eax,[dword 10]
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pascal@19546
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67 ; QMME also works (as told by <J.S.Peatfield@damtp.cambridge.ac.uk>)
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pascal@19546
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68 shl eax,8
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pascal@19546
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69 skip:
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pascal@19546
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70 pop ds
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pascal@19546
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71 jne no_vcpi
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pascal@19546
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72
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pascal@19546
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73 ; Check emm manager status and version
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pascal@19571
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74 ;mov ah,40h ; get status
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pascal@19571
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75 ;int 67h
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pascal@19571
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76 ;test ah,ah
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pascal@19571
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77 ;jnz no_vcpi
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pascal@19546
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78 mov ah,46h ; get version
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pascal@19546
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79 int 67h
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pascal@19546
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80 test ah,ah
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pascal@19546
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81 jnz no_vcpi
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pascal@19546
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82 cmp al,40h ; version must be >= 4.0
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pascal@19546
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83 jb no_vcpi
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pascal@19546
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84 ; Check vcpi manager status
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pascal@19546
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85 ;;mov ax,5A01h ; ALLOCATE RAW PAGES
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pascal@19546
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86 ;;mov bx,4
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pascal@19546
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87 ;;int 67h
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pascal@19546
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88 ;;test ah,ah
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pascal@19546
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89 ;;jnz no_vcpi
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pascal@19546
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90 ;;push dx ;$ save handle
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pascal@19546
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91 mov ax,0DE00h ; check for vcpi present
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pascal@19546
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92 int 67h
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pascal@19546
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93 test ah,ah
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pascal@19571
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94 jnz no_vcpi
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pascal@19546
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95 is386vcpi:
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pascal@19571
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96 inc [_vcpi]
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pascal@19546
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97 extrn prepare_vcpi:near
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pascal@19546
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98 call prepare_vcpi
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pascal@19546
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99 ; get_vcpi_interface() || die("VCPI: low 640k: need 1:1 mapping");
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pascal@19546
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100 ;extrn _get_vcpi_interface:near
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pascal@19546
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101 ;call _get_vcpi_interface
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pascal@19546
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102 mov bx,offset msg_badmapping
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pascal@19634
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103 jz endcpu
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pascal@19571
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104 no_vcpi:
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pascal@19571
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105 ;;pop dx ;$ handle
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pascal@19571
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106 ;;mov ax,4500h ; DEALLOCATE PAGES
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pascal@19571
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107 ;;int 67h
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pascal@19571
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108 extrn die:near
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pascal@19571
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109 godie:
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pascal@19571
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110 jmp near die
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pascal@19571
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111 check_rm_paging:
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pascal@19571
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112 ; It's a 386 in real mode, chk for paging (crazy but possible)
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pascal@19571
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113 mov edx,cr0
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pascal@19571
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114 shl edx,1 ;CR0_PG to CF
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pascal@19571
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115 jc no_vcpi
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pascal@19546
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116 endcpu:
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pascal@19546
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117
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pascal@19515
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118 ;***************************************************************
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pascal@19515
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119 ; build argv & argc
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pascal@19515
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120 ;***************************************************************
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pascal@19546
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121 extrn _heap_top:word
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pascal@19546
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122 mov di,[_heap_top]
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pascal@19546
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123 ;xor ax,ax
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pascal@19546
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124 ;push ax ; envp (already cleared)
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pascal@19546
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125 ;mov [word di],ax ; argv[0] = 0 (idem)
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pascal@19515
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126 mov si,80h
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pascal@19515
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127 lodsb
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pascal@19515
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128 cmp al,7Eh
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pascal@19515
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129 jbe alok
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pascal@19515
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130 mov al,7Eh
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pascal@19515
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131 alok:
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pascal@19546
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132 cbw
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pascal@19515
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133 xchg ax,bx
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pascal@19515
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134 mov [bx+si],bh ; set eos
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pascal@19515
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135 argbuild:
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pascal@19515
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136 mov bx,2 ; argc * 2
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pascal@19515
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137 argeos:
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pascal@19515
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138 mov dl,1 ; look for a start of string
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pascal@19515
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139 mov [byte si-1],bh ; mark eos
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pascal@19515
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140 mov ah,20h ; space will be eos
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pascal@19515
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141 arglp:
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pascal@19515
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142 lodsb
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pascal@19515
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143 cmp al,0h
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pascal@19515
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144 je argdone
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pascal@19515
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145 cmp al,20h
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pascal@19515
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146 jb argeos
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pascal@19515
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147 cmp al,ah
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pascal@19515
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148 je argeos
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pascal@19515
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149 cmp al,27h
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pascal@19515
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150 je isargstr
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pascal@19515
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151 cmp al,22h
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pascal@19515
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152 je isargstr
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pascal@19515
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153 or dl,dl
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pascal@19515
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154 je arglp ; not start of string
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pascal@19515
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155 dec si
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pascal@19515
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156 jmp newarg
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pascal@19515
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157 isargstr:
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pascal@19515
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158 mov ah,al ; expected eos
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pascal@19515
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159 newarg:
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pascal@19515
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160 mov [word bx+di],si ; argv[argc++] = si
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pascal@19515
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161 inc bx
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pascal@19515
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162 inc bx
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pascal@19515
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163 dec dx
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pascal@19515
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164 jmp arglp
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pascal@19515
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165 argdone:
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pascal@19515
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166 ;mov [word bx+di],0 ; argv[argc] = 0
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pascal@19546
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167 lea ax,[bx+di+2]
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pascal@19546
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168 mov [_heap_top],ax
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pascal@19515
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169 push di ; argv
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pascal@19515
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170 shr bx,1
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pascal@19515
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171 push bx ; argc
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pascal@19515
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172 ifndef filearg
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pascal@19515
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173 mov bx,[di+2] ; argv[1]
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pascal@19515
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174 cmp [byte bx],'@'
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pascal@19515
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175 jne argend
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pascal@19546
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176 inc bx
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pascal@19515
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177 extrn open:near
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pascal@19515
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178 call near open
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pascal@19515
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179 jc argend
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pascal@19515
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180 pop bx ; trash argc, argv >> 1Kb !
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pascal@19546
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181 global read_cmdline:near
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pascal@19546
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182 read_cmdline:
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pascal@19515
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183 push di
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pascal@19515
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184 push ax
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pascal@19515
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185 extrn _read:near
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pascal@19515
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186 call near _read
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pascal@19515
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187 pop bx ; fd for close
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pascal@19515
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188 pop si ; si=buffer=argv
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pascal@19515
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189 add di,ax
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pascal@19515
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190 pop ax ; trash sizemax=argv
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pascal@19515
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191 extrn close:near
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pascal@19515
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192 call near close
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pascal@19515
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193 jmp argbuild
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pascal@19515
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194 argend:
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pascal@19515
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195 endif
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pascal@19515
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196
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pascal@19515
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197 ;***************************************************************
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pascal@19515
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198 extrn _main:near
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pascal@19515
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199 call _main
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pascal@19538
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200
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pascal@19515
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201 ;***************************************************************
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pascal@19515
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202 global exit:near
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pascal@19515
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203 exit:
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pascal@19515
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204 mov ah,4Ch
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pascal@19515
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205 int 21h
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pascal@19515
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206 ends _TEXT
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pascal@19515
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207
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pascal@19515
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208 segment _DATA byte public use16 'DATA'
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pascal@19515
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209 global _data_start:byte
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pascal@19515
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210 label _data_start byte
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pascal@19546
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211 msg_badcpu db "I need 386+ CPU in real mode or under VCPI manager"
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pascal@19546
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212 global _vcpi:byte
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pascal@19546
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213 _vcpi db 0
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pascal@19546
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214 msg_badmapping db "VCPI: low 640k: need 1:1 mapping",0
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pascal@19546
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215
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pascal@19515
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216 ends _DATA
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pascal@19515
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217
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pascal@19515
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218 segment _BSS byte public use16 'BSS'
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pascal@19515
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219 global _bss_start:byte
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pascal@19515
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220 label _bss_start byte
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pascal@19515
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221 ends _BSS
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pascal@19515
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222
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pascal@19515
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223 end _text_start
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pascal@19515
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224
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pascal@19515
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225 ;###### END OF FILE ############################################
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