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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@21984
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5 %PAGESIZE 1000
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pascal@19515
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6 %crefref
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pascal@19515
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7 %noincl
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pascal@19515
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8 %nomacs
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pascal@19636
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9 p8086
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pascal@19515
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10
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pascal@19515
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11 group DGROUP _TEXT,_DATA,_BSS
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pascal@19515
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12 assume cs:DGROUP,ds:DGROUP
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pascal@19515
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13
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pascal@19515
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14 segment _TEXT byte public use16 'CODE'
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pascal@20451
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15 ends _TEXT
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pascal@20451
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16
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pascal@20451
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17 segment _DATA byte public use16 'DATA'
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pascal@20451
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18 global _data_start:byte
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pascal@20451
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19 label _data_start byte
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pascal@20451
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20 ifndef NO386
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pascal@22183
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21 msg_badcpu db "I need 386+ CPU in real mode w/o paging"
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pascal@22183
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22 db " or "
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pascal@22183
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23 msg_badmapping db "under VCPI 4.0+ manager with low 640k 1:1 mapping"
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pascal@22183
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24 global _vcpi:byte
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pascal@22183
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25 _vcpi db 0
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pascal@20451
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26 endif
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pascal@20451
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27
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pascal@20451
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28 ends _DATA
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pascal@20451
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29
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pascal@20451
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30 segment _BSS byte public use16 'BSS'
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pascal@21757
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31
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pascal@20451
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32 global _bss_start:byte
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pascal@20451
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33 label _bss_start byte
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pascal@22312
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34 global stktop:byte
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pascal@22183
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35 ifdef NO386
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pascal@22183
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36 global _cpu386:byte
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pascal@22183
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37 _cpu386 db ?
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pascal@22183
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38 org $-1
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pascal@22183
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39 endif
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pascal@20451
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40 global _cpu_features:dword
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pascal@20451
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41 _cpu_features dd ?
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pascal@20451
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42 ends _BSS
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pascal@20451
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43
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pascal@20451
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44 segment _TEXT byte public use16 'CODE'
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pascal@19515
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45
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pascal@19825
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46 macro cpuid
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pascal@19825
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47 db 0fh,0A2h
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pascal@19825
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48 endm
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pascal@19825
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49
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pascal@19515
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50 org 100h
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pascal@19515
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51 global _text_start:byte
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pascal@19515
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52 label _text_start byte
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pascal@19546
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53
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pascal@19515
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54 ;***************************************************************
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pascal@19515
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55 ; clear bss
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pascal@19515
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56 ;***************************************************************
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pascal@21757
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57 mov sp,offset stktop
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pascal@22179
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58 mov si,offset _bss_start
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pascal@20457
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59 mov bx, 0F000h ; cld ; cli & empty string
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pascal@19515
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60 clearbss:
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pascal@22312
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61 mov [si],bl ; clear bss + heap
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pascal@20426
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62 inc si
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pascal@19546
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63 jne clearbss
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pascal@19546
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64
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pascal@19546
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65 ;***************************************************************
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pascal@19546
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66 ; check CPU
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pascal@19546
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67 ;***************************************************************
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pascal@19546
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68
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pascal@19546
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69 ; Check for oldies
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pascal@19873
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70 push bx ; < 286 : flags[12..15] are forced 1
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pascal@19873
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71 popf ; = 286 : flags[12..15] are forced 0
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pascal@19873
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72 pushf ; > 286 : only flags[15] is forced 0
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pascal@19873
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73 pop dx
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pascal@20451
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74 add dh,bh ; NS=386+, S+NC=286, S+C=86/186
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pascal@20451
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75 ifndef NO386
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pascal@19873
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76 mov bx,offset msg_badcpu
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pascal@22183
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77 js godie ;it is not a 386+, die
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pascal@20451
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78 else
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pascal@22183
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79 js endcpu86 ;it is not a 386+, try ELKS & co
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pascal@19546
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80 endif
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pascal@19636
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81 p386
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pascal@19546
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82 ; Check for vm
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pascal@19546
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83 smsw ax ;SMSW cannot be trapped! :-)
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pascal@19571
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84 and al,1 ;MSW_PE
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pascal@19546
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85 ; We're in vm
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pascal@20457
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86 jnz check_vcpi
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pascal@20457
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87
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pascal@20457
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88 check_rm_paging:
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pascal@20457
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89 ; It's a 386 in real mode, chk for paging (crazy but possible)
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pascal@20457
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90 mov eax,cr0
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pascal@20457
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91 inc eax ;CR0_PG to S
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pascal@20457
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92 jns endcpu386
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pascal@22183
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93 ifndef NO386
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pascal@20457
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94 p8086
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pascal@20457
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95 extrn die:near
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pascal@20457
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96 godie:
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pascal@22183
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97 no_vcpi:
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pascal@20457
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98 call near die
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pascal@22183
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99 else
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pascal@22183
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100 jmp endcpu86
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pascal@22183
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101 endif
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pascal@19546
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102
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pascal@19546
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103 ;***************************************************************
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pascal@19546
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104 ; checks for vcpi
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pascal@19546
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105 ;***************************************************************
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pascal@19546
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106 label check_vcpi near
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pascal@20457
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107 p386
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pascal@19546
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108 push ds
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pascal@19546
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109 ; Check whether it is safe to call 67h (we trust only known EMM managers)
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pascal@20426
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110 push si
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pascal@19546
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111 pop ds
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pascal@19546
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112 mov ds,[word 67h*4+2]
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pascal@20426
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113 cmp [dword si+10+4],'0XXX'
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pascal@19546
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114 jne skip
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pascal@19825
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115 ;mov eax,'XMME'
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pascal@20426
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116 ;xor eax,[dword si+10]
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pascal@19546
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117 ; QMME also works (as told by <J.S.Peatfield@damtp.cambridge.ac.uk>)
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pascal@19825
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118 ;shl eax,8
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pascal@19825
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119 mov ax,'ME'
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pascal@20426
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120 xor ax,[word si+10]
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pascal@19546
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121 skip:
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pascal@19546
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122 pop ds
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pascal@19546
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123 jne no_vcpi
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pascal@19546
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124
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pascal@19546
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125 ; Check emm manager status and version
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pascal@19571
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126 ;mov ah,40h ; get status
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pascal@19571
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127 ;int 67h
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pascal@22203
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128 ;inc ax
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pascal@22203
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129 ;js no_vcpi
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pascal@19546
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130 mov ah,46h ; get version
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pascal@19546
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131 int 67h
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pascal@22204
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132 cmp ax,40h ; version must be >= 4.0
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pascal@22203
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133 jl no_vcpi ; btw check ax.15
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pascal@19546
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134 ; Check vcpi manager status
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pascal@19546
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135 ;;mov ax,5A01h ; ALLOCATE RAW PAGES
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pascal@19546
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136 ;;mov bx,4
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pascal@19546
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137 ;;int 67h
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pascal@22203
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138 ;;inc ax
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pascal@22203
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139 ;;js no_vcpi
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pascal@19546
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140 ;;push dx ;$ save handle
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pascal@19546
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141 mov ax,0DE00h ; check for vcpi present
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pascal@19546
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142 int 67h
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pascal@19546
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143 test ah,ah
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pascal@19571
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144 jnz no_vcpi
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pascal@19546
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145 is386vcpi:
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pascal@19546
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146 extrn prepare_vcpi:near
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pascal@19546
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147 call prepare_vcpi
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pascal@19546
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148 ; get_vcpi_interface() || die("VCPI: low 640k: need 1:1 mapping");
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pascal@19546
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149 ;extrn _get_vcpi_interface:near
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pascal@19546
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150 ;call _get_vcpi_interface
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pascal@22183
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151 ifndef NO386
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pascal@19546
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152 mov bx,offset msg_badmapping
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pascal@20457
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153 jnz no_vcpi
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pascal@22183
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154 dec [byte bx+_vcpi-msg_badmapping]
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pascal@22183
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155 else
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pascal@22183
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156 jnz no_vcpi
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pascal@22183
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157 extrn _vcpi:byte
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pascal@22183
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158 dec [byte _vcpi]
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pascal@22183
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159 endif
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pascal@20457
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160 endcpu386:
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pascal@20457
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161 pushfd
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pascal@20457
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162 pop dx
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pascal@20457
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163 pop ax
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pascal@20457
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164 mov bl,al
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pascal@20457
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165 xor al,20h ; toggle CPUID feature bit 21
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pascal@20457
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166 push ax
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pascal@20457
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167 push dx
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pascal@20457
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168 popfd
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pascal@20457
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169 pushfd
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pascal@22203
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170 pop dx ; dx.1=flags.1=1
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pascal@20457
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171 pop ax
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pascal@20457
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172 xor al,bl ; clear C
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pascal@20457
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173 je @@no_cpuid ; CPUID feature bit changed ?
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pascal@20457
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174 mov eax,80000001h ; Extended Processor Info and Feature Bits
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pascal@20457
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175 cpuid
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pascal@22183
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176 ifdef NO386
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pascal@22204
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177 mov dl,-1 ; set 386 flag
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pascal@22203
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178 db 66h ; mov [_cpu_features],edx
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pascal@22203
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179 @@no_cpuid:
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pascal@22203
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180 mov [word _cpu_features],dx ; dl != 0
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pascal@22203
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181 no_vcpi:
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pascal@22203
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182 else
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pascal@20457
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183 mov [_cpu_features],edx
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pascal@20457
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184 @@no_cpuid:
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pascal@22203
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185 endif
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pascal@20457
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186 endcpu86:
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pascal@19636
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187 p8086
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pascal@19546
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188
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pascal@19515
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189 ;***************************************************************
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pascal@19515
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190 ; build argv & argc
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pascal@19515
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191 ;***************************************************************
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pascal@22203
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192 extrn _bss_end:word
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pascal@22203
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193 mov di,offset _bss_end
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pascal@22203
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194 global _heap_top
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pascal@22203
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195 org $-2
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pascal@22203
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196 _heap_top dw ?
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pascal@19546
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197 ;xor ax,ax
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pascal@19546
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198 ;push ax ; envp (already cleared)
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pascal@19546
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199 ;mov [word di],ax ; argv[0] = 0 (idem)
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pascal@19515
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200 mov si,80h
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pascal@19515
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201 lodsb
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pascal@19515
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202 cmp al,7Eh
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pascal@19515
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203 jbe alok
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pascal@19515
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204 mov al,7Eh
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pascal@19515
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205 alok:
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pascal@19546
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206 cbw
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pascal@19515
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207 xchg ax,bx
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pascal@19515
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208 mov [bx+si],bh ; set eos
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pascal@19515
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209 argbuild:
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pascal@20160
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210 ifdef DEBUG
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pascal@20142
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211 p386
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pascal@20142
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212 pusha
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pascal@20142
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213 mov bx,si
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pascal@20142
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214 extrn puts:near
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pascal@20142
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215 call puts
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pascal@20142
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216 popa
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pascal@20160
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217 endif
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pascal@19515
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218 mov bx,2 ; argc * 2
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pascal@19515
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219 argeos:
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pascal@20451
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220 mov cx,1 ; look for a start of string
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pascal@19515
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221 mov [byte si-1],bh ; mark eos
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pascal@19515
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222 mov ah,20h ; space will be eos
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pascal@19515
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223 arglp:
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pascal@19515
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224 lodsb
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pascal@19515
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225 cmp al,0h
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pascal@19515
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226 je argdone
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pascal@19515
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227 cmp al,20h
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pascal@19515
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228 jb argeos
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pascal@19515
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229 cmp al,ah
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pascal@19515
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230 je argeos
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pascal@19515
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231 cmp al,27h
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pascal@19515
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232 je isargstr
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pascal@19515
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233 cmp al,22h
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pascal@19515
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234 je isargstr
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pascal@20451
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235 jcxz arglp ; not start of string
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pascal@19515
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236 dec si
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pascal@19884
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237 ;jmp newarg
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pascal@20451
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238 db 0BAh ; mov dx,im opcode
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pascal@19515
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239 isargstr:
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pascal@19515
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240 mov ah,al ; expected eos
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pascal@19515
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241 newarg:
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pascal@19515
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242 mov [word bx+di],si ; argv[argc++] = si
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pascal@19515
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243 inc bx
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pascal@19515
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244 inc bx
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pascal@20451
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245 dec cx
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pascal@19515
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246 jmp arglp
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pascal@19515
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247 argdone:
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pascal@19515
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248 ;mov [word bx+di],0 ; argv[argc] = 0
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pascal@19546
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249 lea ax,[bx+di+2]
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pascal@19546
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250 mov [_heap_top],ax
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pascal@19515
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251 push di ; argv
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pascal@19515
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252 shr bx,1
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pascal@19515
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253 push bx ; argc
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pascal@19515
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254 ifndef filearg
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pascal@19515
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255 mov bx,[di+2] ; argv[1]
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pascal@20528
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256 extrn openargs:near
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pascal@20528
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257 call near openargs
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pascal@19515
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258 jc argend
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pascal@19515
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259 pop bx ; trash argc, argv >> 1Kb !
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pascal@19546
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260 global read_cmdline:near
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pascal@20528
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261 pop cx ; sizemax=argv
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pascal@19546
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262 read_cmdline:
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pascal@20528
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263 mov dx,di
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pascal@20528
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264 push dx
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pascal@19515
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265 push ax
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pascal@20528
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266 xchg ax,bx
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pascal@20528
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267 extrn @read$cxdxbx:near ; read(fd=bx,buffer=dx,size=cx)
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pascal@20528
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268 call near @read$cxdxbx
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pascal@19515
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269 pop bx ; fd for close
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pascal@19515
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270 pop si ; si=buffer=argv
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pascal@19515
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271 add di,ax
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pascal@19515
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272 extrn close:near
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pascal@19515
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273 call near close
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pascal@19515
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274 jmp argbuild
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pascal@19515
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275 argend:
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pascal@19515
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276 endif
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pascal@19515
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277
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pascal@19515
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278 ;***************************************************************
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pascal@21757
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279 extrn _main:near
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pascal@21757
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280 call _main
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pascal@21757
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281 ;never return
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pascal@19538
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282
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pascal@19515
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283 ;***************************************************************
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pascal@21757
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284
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pascal@19515
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285 ends _TEXT
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pascal@19515
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286
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pascal@19515
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287
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pascal@19515
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288 end _text_start
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pascal@19515
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289
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pascal@19515
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290 ;###### END OF FILE ############################################
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