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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 p8086
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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@20451
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14 ends _TEXT
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pascal@20451
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15
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pascal@20451
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16 segment _DATA byte public use16 'DATA'
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pascal@20451
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17 global _data_start:byte
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pascal@20451
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18 label _data_start byte
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pascal@20451
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19 ifndef NO386
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pascal@20451
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20 msg_badcpu db "I need 386+ CPU in real mode or under VCPI manager"
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pascal@20451
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21 endif
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pascal@20451
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22 global _vcpi:byte
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pascal@20451
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23 _vcpi db 0
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pascal@20528
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24 msg_badmapping db "VCPI: low 640k need 1:1 mapping",0
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pascal@20451
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25
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pascal@20451
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26 ends _DATA
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pascal@20451
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27
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pascal@20451
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28 segment _BSS byte public use16 'BSS'
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pascal@20451
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29 global _bss_start:byte
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pascal@20451
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30 label _bss_start byte
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pascal@20451
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31 ifdef EXTRA
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pascal@20451
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32 global _cpu_features:dword
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pascal@20451
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33 _cpu_features dd ?
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pascal@20451
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34 endif
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pascal@20451
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35 ends _BSS
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pascal@20451
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36
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pascal@20451
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37 segment _TEXT byte public use16 'CODE'
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pascal@19515
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38
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pascal@19825
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39 macro cpuid
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pascal@19825
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40 db 0fh,0A2h
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pascal@19825
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41 endm
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pascal@19825
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42
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pascal@19515
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43 org 100h
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pascal@19515
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44 global _text_start:byte
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pascal@19515
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45 label _text_start byte
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pascal@19546
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46
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pascal@19515
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47 ;***************************************************************
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pascal@19515
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48 ; clear bss
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pascal@19515
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49 ;***************************************************************
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pascal@20426
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50 mov si,offset _bss_start
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pascal@20457
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51 mov bx, 0F000h ; cld ; cli & empty string
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pascal@19515
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52 clearbss:
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pascal@20451
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53 mov [si],bl ; clear bss + heap + sp
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pascal@20426
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54 inc si
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pascal@19546
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55 jne clearbss
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pascal@19546
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56
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pascal@19546
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57 ;***************************************************************
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pascal@19546
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58 ; check CPU
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pascal@19546
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59 ;***************************************************************
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pascal@19546
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60
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pascal@19546
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61 ; Check for oldies
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pascal@19873
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62 push bx ; < 286 : flags[12..15] are forced 1
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pascal@19873
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63 popf ; = 286 : flags[12..15] are forced 0
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pascal@19873
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64 pushf ; > 286 : only flags[15] is forced 0
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pascal@19873
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65 pop dx
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pascal@20451
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66 add dh,bh ; NS=386+, S+NC=286, S+C=86/186
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pascal@20451
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67 ifndef NO386
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pascal@19873
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68 mov bx,offset msg_badcpu
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pascal@20457
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69 js godie ;it is not a 386+
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pascal@20451
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70 else
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pascal@20457
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71 js endcpu86 ;it is not a 386+
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pascal@19546
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72 endif
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pascal@19636
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73 p386
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pascal@19546
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74 ; Check for vm
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pascal@19546
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75 smsw ax ;SMSW cannot be trapped! :-)
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pascal@19571
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76 and al,1 ;MSW_PE
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pascal@19546
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77 ; We're in vm
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pascal@20457
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78 jnz check_vcpi
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pascal@20457
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79
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pascal@20457
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80 check_rm_paging:
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pascal@20457
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81 ; It's a 386 in real mode, chk for paging (crazy but possible)
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pascal@20457
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82 mov eax,cr0
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pascal@20457
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83 inc eax ;CR0_PG to S
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pascal@20457
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84 jns endcpu386
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pascal@20457
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85 no_vcpi:
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pascal@20457
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86 p8086
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pascal@20457
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87 extrn die:near
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pascal@20457
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88 godie:
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pascal@20457
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89 call near die
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pascal@19546
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90
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pascal@19546
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91 ;***************************************************************
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pascal@19546
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92 ; checks for vcpi
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pascal@19546
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93 ;***************************************************************
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pascal@19546
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94 label check_vcpi near
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pascal@20457
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95 p386
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pascal@19546
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96 push ds
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pascal@19546
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97 ; Check whether it is safe to call 67h (we trust only known EMM managers)
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pascal@20426
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98 push si
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pascal@19546
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99 pop ds
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pascal@19546
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100 mov ds,[word 67h*4+2]
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pascal@20426
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101 cmp [dword si+10+4],'0XXX'
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pascal@19546
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102 jne skip
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pascal@19825
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103 ;mov eax,'XMME'
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pascal@20426
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104 ;xor eax,[dword si+10]
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pascal@19546
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105 ; QMME also works (as told by <J.S.Peatfield@damtp.cambridge.ac.uk>)
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pascal@19825
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106 ;shl eax,8
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pascal@19825
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107 mov ax,'ME'
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pascal@20426
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108 xor ax,[word si+10]
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pascal@19546
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109 skip:
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pascal@19546
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110 pop ds
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pascal@19546
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111 jne no_vcpi
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pascal@19546
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112
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pascal@19546
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113 ; Check emm manager status and version
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pascal@19571
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114 ;mov ah,40h ; get status
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pascal@19571
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115 ;int 67h
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pascal@19571
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116 ;test ah,ah
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pascal@19571
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117 ;jnz no_vcpi
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pascal@19546
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118 mov ah,46h ; get version
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pascal@19546
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119 int 67h
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pascal@19546
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120 test ah,ah
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pascal@19546
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121 jnz no_vcpi
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pascal@19546
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122 cmp al,40h ; version must be >= 4.0
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pascal@19546
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123 jb no_vcpi
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pascal@19546
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124 ; Check vcpi manager status
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pascal@19546
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125 ;;mov ax,5A01h ; ALLOCATE RAW PAGES
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pascal@19546
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126 ;;mov bx,4
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pascal@19546
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127 ;;int 67h
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pascal@19546
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128 ;;test ah,ah
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pascal@19546
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129 ;;jnz no_vcpi
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pascal@19546
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130 ;;push dx ;$ save handle
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pascal@19546
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131 mov ax,0DE00h ; check for vcpi present
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pascal@19546
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132 int 67h
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pascal@19546
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133 test ah,ah
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pascal@19571
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134 jnz no_vcpi
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pascal@19546
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135 is386vcpi:
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pascal@19546
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136 extrn prepare_vcpi:near
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pascal@19546
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137 call prepare_vcpi
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pascal@19546
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138 ; get_vcpi_interface() || die("VCPI: low 640k: need 1:1 mapping");
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pascal@19546
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139 ;extrn _get_vcpi_interface:near
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pascal@19546
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140 ;call _get_vcpi_interface
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pascal@19546
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141 mov bx,offset msg_badmapping
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pascal@20457
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142 jnz no_vcpi
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pascal@20457
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143 inc [byte bx+_vcpi-msg_badmapping]
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pascal@20457
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144 endcpu386:
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pascal@20457
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145 ifdef EXTRA
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pascal@20457
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146 pushfd
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pascal@20457
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147 pop dx
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pascal@20457
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148 pop ax
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pascal@20457
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149 mov bl,al
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pascal@20457
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150 xor al,20h ; toggle CPUID feature bit 21
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pascal@20457
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151 push ax
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pascal@20457
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152 push dx
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pascal@20457
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153 popfd
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pascal@20457
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154 pushfd
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pascal@20457
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155 pop dx
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pascal@20457
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156 pop ax
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pascal@20457
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157 xor al,bl ; clear C
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pascal@20457
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158 je @@no_cpuid ; CPUID feature bit changed ?
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pascal@20457
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159 mov eax,80000001h ; Extended Processor Info and Feature Bits
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pascal@20457
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160 cpuid
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pascal@20457
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161 mov [_cpu_features],edx
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pascal@20457
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162 @@no_cpuid:
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pascal@20457
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163 endif
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pascal@20457
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164 endcpu86:
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pascal@19636
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165 p8086
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pascal@19546
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166
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pascal@19515
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167 ;***************************************************************
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pascal@19515
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168 ; build argv & argc
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pascal@19515
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169 ;***************************************************************
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pascal@19546
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170 extrn _heap_top:word
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pascal@19546
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171 mov di,[_heap_top]
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pascal@19546
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172 ;xor ax,ax
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pascal@19546
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173 ;push ax ; envp (already cleared)
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pascal@19546
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174 ;mov [word di],ax ; argv[0] = 0 (idem)
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pascal@19515
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175 mov si,80h
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pascal@19515
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176 lodsb
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pascal@19515
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177 cmp al,7Eh
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pascal@19515
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178 jbe alok
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pascal@19515
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179 mov al,7Eh
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pascal@19515
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180 alok:
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pascal@19546
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181 cbw
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pascal@19515
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182 xchg ax,bx
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pascal@19515
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183 mov [bx+si],bh ; set eos
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pascal@19515
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184 argbuild:
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pascal@20160
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185 ifdef DEBUG
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pascal@20142
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186 p386
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pascal@20142
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187 pusha
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pascal@20142
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188 mov bx,si
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pascal@20142
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189 extrn puts:near
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pascal@20142
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190 call puts
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pascal@20142
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191 popa
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pascal@20160
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192 endif
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pascal@19515
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193 mov bx,2 ; argc * 2
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pascal@19515
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194 argeos:
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pascal@20451
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195 mov cx,1 ; look for a start of string
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pascal@19515
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196 mov [byte si-1],bh ; mark eos
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pascal@19515
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197 mov ah,20h ; space will be eos
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pascal@19515
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198 arglp:
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pascal@19515
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199 lodsb
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pascal@19515
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200 cmp al,0h
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pascal@19515
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201 je argdone
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pascal@19515
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202 cmp al,20h
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pascal@19515
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203 jb argeos
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pascal@19515
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204 cmp al,ah
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pascal@19515
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205 je argeos
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pascal@19515
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206 cmp al,27h
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pascal@19515
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207 je isargstr
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pascal@19515
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208 cmp al,22h
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pascal@19515
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209 je isargstr
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pascal@20451
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210 jcxz arglp ; not start of string
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pascal@19515
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211 dec si
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pascal@19884
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212 ;jmp newarg
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pascal@20451
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213 db 0BAh ; mov dx,im opcode
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pascal@19515
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214 isargstr:
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pascal@19515
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215 mov ah,al ; expected eos
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pascal@19515
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216 newarg:
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pascal@19515
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217 mov [word bx+di],si ; argv[argc++] = si
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pascal@19515
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218 inc bx
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pascal@19515
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219 inc bx
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pascal@20451
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220 dec cx
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pascal@19515
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221 jmp arglp
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pascal@19515
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222 argdone:
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pascal@19515
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223 ;mov [word bx+di],0 ; argv[argc] = 0
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pascal@19546
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224 lea ax,[bx+di+2]
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pascal@19546
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225 mov [_heap_top],ax
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pascal@19515
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226 push di ; argv
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pascal@19515
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227 shr bx,1
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pascal@19515
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228 push bx ; argc
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pascal@19515
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229 ifndef filearg
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pascal@19515
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230 mov bx,[di+2] ; argv[1]
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pascal@20528
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231 extrn openargs:near
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pascal@20528
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232 call near openargs
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pascal@19515
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233 jc argend
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pascal@19515
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234 pop bx ; trash argc, argv >> 1Kb !
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pascal@19546
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235 global read_cmdline:near
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pascal@20528
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236 pop cx ; sizemax=argv
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pascal@19546
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237 read_cmdline:
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pascal@20528
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238 mov dx,di
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pascal@20528
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239 push dx
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pascal@19515
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240 push ax
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pascal@20528
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241 xchg ax,bx
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pascal@20528
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242 extrn @read$cxdxbx:near ; read(fd=bx,buffer=dx,size=cx)
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pascal@20528
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243 call near @read$cxdxbx
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pascal@19515
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244 pop bx ; fd for close
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pascal@19515
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245 pop si ; si=buffer=argv
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pascal@19515
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246 add di,ax
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pascal@19515
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247 extrn close:near
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pascal@19515
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248 call near close
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pascal@19515
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249 jmp argbuild
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pascal@19515
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250 argend:
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pascal@19515
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251 endif
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pascal@19515
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252
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pascal@19515
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253 ;***************************************************************
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pascal@19515
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254 extrn _main:near
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pascal@19515
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255 call _main
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pascal@19538
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256
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pascal@19515
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257 ;***************************************************************
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pascal@19515
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258 global exit:near
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pascal@19515
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259 exit:
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pascal@19515
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260 mov ah,4Ch
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pascal@19515
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261 int 21h
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pascal@19515
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262 ends _TEXT
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pascal@19515
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263
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pascal@19515
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264
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pascal@19515
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265 end _text_start
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pascal@19515
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266
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pascal@19515
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267 ;###### END OF FILE ############################################
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