rev |
line source |
pascal@15188
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1 SYSSEG = 0x1000
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pascal@15188
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2 INITSEG = 0x9000
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pascal@15188
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3 SETUPSEG = 0x9020
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pascal@15188
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4
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pascal@15188
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5 .text
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pascal@15188
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6 .code16
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pascal@15188
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7 .org 0
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pascal@15188
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8 .globl _start
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pascal@15188
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9 _start:
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pascal@15188
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10
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pascal@19399
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11 #define CODESZ 512 /* patched by installer */
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pascal@15188
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12
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pascal@15188
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13 /* some extra features */
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pascal@15188
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14 #define EXE_SUPPORT real mode dos .exe file support
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pascal@15188
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15 #define CMDLINE 0x9E00
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pascal@15188
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16 #define HELP store help message for /? argument
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pascal@15188
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17 #define CHECK_REALMODE does not support vm86
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pascal@19399
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18 #define SHUTDOWNDOS shutdown DOS services
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pascal@15188
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19
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pascal@15188
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20 /* some contraints to reduce the size */
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pascal@15188
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21 //#define FLOPPY_1440K_ONLY 1.44M floppies support only
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pascal@15188
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22 #define NO_CURSOR_DEFINITION
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pascal@15188
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23
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pascal@15188
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24 #ifdef EXE_SUPPORT
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pascal@19399
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25 #define EXEADRS(x) (x+0xE0)
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pascal@15188
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26 stacktop = 0x9E00 # in 0x8000 .. 0xA000
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pascal@15188
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27 decw %bp // Magic number: MZ
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pascal@15188
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28 popw %dx
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pascal@15188
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29 jmp start // Bytes on last page of file
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pascal@15188
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30 .word (CODESZ+511)/512 // Pages in file
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pascal@15188
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31 .word 0 // Relocations
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pascal@15188
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32 .word (end_header-_start)/16 // Size of header in paragraphs
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pascal@15188
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33 .word 4096 // Minimum extra paragraphs needed
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pascal@15188
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34 .word -1 // Maximum extra paragraphs needed
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pascal@15188
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35 .word (CODESZ+15)/16 // Initial (relative) SS value
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pascal@15188
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36 .word stacktop // Initial SP value
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pascal@15188
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37 .word 0 // Checksum
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pascal@15188
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38 .word EXEADRS(comstart) // Initial IP value
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pascal@15188
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39 .word 0xFFF0 // Initial (relative) CS value
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pascal@15188
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40 // .word 0x001C // File address of relocation table
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pascal@15188
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41 // .word 0,0,0 // Overlay number
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pascal@15188
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42 .ascii "(SliTaz)"
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pascal@15188
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43 end_header:
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pascal@15188
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44 comstart:
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pascal@15470
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45 cld # assume nothing
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pascal@15188
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46 #ifdef CMDLINE
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pascal@19400
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47 movw %sp, %di
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pascal@15471
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48 #else
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pascal@15188
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49 #undef HELP
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pascal@15188
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50 #endif
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pascal@15188
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51 pushw $INITSEG
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pascal@15188
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52 popw %es
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pascal@15188
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53 #ifdef CMDLINE
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pascal@15188
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54 movw $0x80, %si
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pascal@15188
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55 lodsb
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pascal@15188
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56 cbw
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pascal@15188
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57 xchgw %ax, %cx
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pascal@15188
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58 jcxz nocmdline
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pascal@15470
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59 movw $0xA33F, 0x7F(%si)
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pascal@15188
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60 skipspace:
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pascal@15188
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61 lodsb
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pascal@15188
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62 cmpb $0x20, %al
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pascal@15188
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63 je skipspace
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pascal@15188
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64 decw %si
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pascal@15188
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65 rep
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pascal@15188
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66 movsb
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pascal@15188
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67 # ifdef HELP
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pascal@15188
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68 # define PUTS
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pascal@15188
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69 movw $EXEADRS(helpmsg), %si
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pascal@15485
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70 cmpb $'/'+1, %al
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pascal@15476
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71 # ifdef CHECK_REALMODE
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pascal@15485
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72 js jsputs
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pascal@15476
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73 # else
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pascal@15485
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74 js puts
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pascal@15476
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75 # endif
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pascal@15188
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76 # endif
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pascal@15188
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77 nocmdline:
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pascal@15188
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78 #endif
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pascal@15472
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79 movw $SYSSEG, %ax
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pascal@19400
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80 movb $(512-(end_header-_start))/2, %cl
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pascal@19400
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81 movw $end_header, %di
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pascal@15188
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82 #ifdef CHECK_REALMODE
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pascal@15188
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83 #define PUTS
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pascal@15188
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84 movw $EXEADRS(realmode_expected), %si
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pascal@19400
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85 //movw syssize-realmode_expected(%si), %bp
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pascal@19400
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86 .byte 0x8B, 0x6C, syssize-realmode_expected
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pascal@19400
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87 //movb setup_sects-realmode_expected(%si), %ch
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pascal@19400
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88 .byte 0x8A, 0x6C, setup_sects-realmode_expected
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pascal@15188
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89 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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pascal@15188
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90 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
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pascal@15472
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91 //movb $0x10, %ah // DF = IF = TF = 0
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pascal@15188
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92 pushw %ax
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pascal@15188
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93 popfw // < 286 : flags[12..15] are forced 1
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pascal@15188
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94 pushfw // = 286 : flags[12..15] are forced 0
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pascal@15469
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95 popw %dx // > 286 : only flags[15] is forced 0
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pascal@15485
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96 cmpb %ah, %dh // test Fx and 0x cases
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pascal@15485
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97 jsputs:
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pascal@15485
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98 js puts // S= not 386+
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pascal@15472
|
99 smsww %dx
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pascal@15472
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100 shrw $1, %dx
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pascal@15472
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101 jc puts
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pascal@17223
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102 #else
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pascal@17223
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103 movw EXEADRS(syssize), %bp
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pascal@17223
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104 movb EXEADRS(setup_sects), %ch
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pascal@15188
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105 #endif
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pascal@15188
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106 movw $0x100, %si
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pascal@15188
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107 rep
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pascal@15188
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108 movsw
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pascal@19400
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109 movw %ds, %bx
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pascal@19399
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110 #ifndef SHUTDOWNDOS
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pascal@15188
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111 ljmp $INITSEG, $movesys
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pascal@19399
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112 #else
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pascal@19399
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113 pushaw
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pascal@19400
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114 movw %cx, %ds # %ds = 0
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pascal@19400
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115 movw $4, %si
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pascal@19400
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116 pushl (%si)
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pascal@19400
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117 movw $step19, (%si)
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pascal@19400
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118 movw %es, 2(%si)
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pascal@19399
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119 pushfw
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pascal@19399
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120 popw %ax
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pascal@19399
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121 incb %ah # set TF
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pascal@19399
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122 pushw %ax
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pascal@19399
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123 popfw
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pascal@19400
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124 ljmp *4*0x19-4(%si)
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pascal@19399
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125 #endif
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pascal@15188
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126 start:
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pascal@15188
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127 pushw %dx
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pascal@15188
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128 #else
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pascal@15188
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129 #undef HELP
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pascal@15188
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130 #undef CMDLINE
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pascal@15188
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131 #undef CHECK_REALMODE
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pascal@15188
|
132 #endif
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pascal@15188
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133 cld # assume nothing
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pascal@15188
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134 stacktop = 0x9E00 # in 0x8000 .. 0xA000
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pascal@15188
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135 zeroed = 12 # zeroed registers
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pascal@15188
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136 movw $stacktop-12-zeroed, %di # stacktop is an arbitrary value >=
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pascal@15188
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137 # length of bootsect + length of
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pascal@15188
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138 # setup + room for stack;
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pascal@15188
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139 # 12 is disk parm size.
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pascal@15188
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140 pushw $INITSEG
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pascal@15188
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141 popw %ss # %ss contain INITSEG
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pascal@15188
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142 movw %di, %sp # put stack at INITSEG:stacktop-...
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pascal@15188
|
143
|
pascal@15188
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144 # Many BIOS's default disk parameter tables will not recognize
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pascal@15188
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145 # multi-sector reads beyond the maximum sector number specified
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pascal@15188
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146 # in the default diskette parameter tables - this may mean 7
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pascal@15188
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147 # sectors in some cases.
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pascal@15188
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148 #
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pascal@15188
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149 # Since single sector reads are slow and out of the question,
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pascal@15188
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150 # we must take care of this by creating new parameter tables
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pascal@15188
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151 # (for the first disk) in RAM. We can set the maximum sector
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pascal@15188
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152 # count to 36 - the most we will encounter on an ED 2.88.
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pascal@15188
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153 #
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pascal@15188
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154 # High doesn't hurt. Low does. Let's use the max: 63
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pascal@15188
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155
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pascal@15188
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156 pushw %ss
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pascal@15188
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157 popw %es # %es = %ss = INITSEG
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pascal@15188
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158 xorw %ax, %ax # %ax = 0
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pascal@15472
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159 #ifdef EXE_SUPPORT
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pascal@15472
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160 cwd # %dx = 0
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pascal@15472
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161 #endif
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pascal@15188
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162 movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
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pascal@15188
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163 rep # don't worry about cld
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pascal@15188
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164 stosw # already done above
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pascal@15188
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165 popw %bx # offset = 0
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pascal@15188
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166 popw %ds # %ds = 0
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pascal@15188
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167 popw %fs # %fs = 0
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pascal@15188
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168
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pascal@15188
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169 movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0)
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pascal@15188
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170 incw %ax
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pascal@15188
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171
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pascal@15188
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172 ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address
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pascal@15188
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173 pushw %es
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pascal@15188
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174 pushw %di
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pascal@15188
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175 movb $6, %cl # copy 12 bytes
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pascal@15188
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176 rep # don't worry about cld
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pascal@15188
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177 movsw # already done above
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pascal@15188
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178 pushw %ss
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pascal@15188
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179 popw %ds # now %ds = %es = %ss = INITSEG
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pascal@15188
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180 popl %fs:0x78(%bx) # update parameter table address
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pascal@15188
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181 movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
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pascal@15188
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182 cli
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pascal@15188
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183
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pascal@15188
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184 xchg %ax, %di # sector count
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pascal@15188
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185 popw %ax # limits = 0
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pascal@15188
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186 incw %cx # cylinder 0, sector 1, clear Z
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pascal@15188
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187 call read_first_sectors # read setup
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pascal@15188
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188
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pascal@15188
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189 # This routine loads the system at address LOADSEG, making sure
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pascal@15188
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190 # no 64kB boundaries are crossed. We try to load it as fast as
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pascal@15188
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191 # possible, loading whole tracks whenever we can.
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pascal@15188
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192
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pascal@15188
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193 popw %bx # clear %bx
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pascal@15188
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194 movw syssize, %di
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pascal@17223
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195 decw %di
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pascal@15188
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196 shrw $9-4, %di
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pascal@17223
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197 incw %di
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pascal@15188
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198 movw $SYSSEG, %cx
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pascal@15188
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199 call read_sectorsCX
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pascal@15188
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200
|
pascal@15188
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201 # This procedure turns off the floppy drive motor, so
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pascal@15188
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202 # that we enter the kernel in a known state, and
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pascal@15188
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203 # don't have to worry about it later.
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pascal@15188
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204
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pascal@15188
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205 kill_motor:
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pascal@15188
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206 xchgw %ax, %di # reset FDC (%di < 128)
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pascal@15188
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207 int $0x13
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pascal@15188
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208
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pascal@15188
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209 # After that (everything loaded), we jump to the setup-routine
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pascal@15188
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210 # loaded directly after the bootblock:
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pascal@15188
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211 # Segments are as follows: %ds = %ss = INITSEG
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pascal@15188
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212
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pascal@15188
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213 jmp_setup:
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pascal@15188
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214 ljmp $SETUPSEG, $0
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pascal@15188
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215
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pascal@15188
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216 #ifdef PUTS
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pascal@15188
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217 #define PUTC
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pascal@15472
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218 putslp:
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pascal@15472
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219 call putc
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pascal@15188
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220 puts:
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pascal@15188
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221 lodsb
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pascal@15188
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222 orb %al, %al
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pascal@15472
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223 jne putslp
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pascal@15480
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224 int $0x20 // dos exit
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pascal@15188
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225 #endif
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pascal@15188
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226 #ifdef EXE_SUPPORT
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pascal@19399
|
227 #ifdef SHUTDOWNDOS
|
pascal@19399
|
228 doiret:
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pascal@19399
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229 iret
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pascal@19399
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230 step19:
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pascal@19399
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231 pushw %si
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pascal@19399
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232 pushw %ds
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pascal@19399
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233 movw %sp, %si
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pascal@19399
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234 ldsw %ss:4(%si), %si
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pascal@19399
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235 cmpw $0x19CD, (%si)
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pascal@19399
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236 popw %ds
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pascal@19399
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237 popw %si
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pascal@19399
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238 jne doiret
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pascal@19399
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239 xorw %si, %si
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pascal@19399
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240 mov %si, %ds
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pascal@19399
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241 popl 4*0x19(%si)
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pascal@19400
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242 movw $stacktop-4-16, %sp
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pascal@19399
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243 popl 4(%si)
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pascal@19399
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244 popaw
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pascal@19399
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245 #endif
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pascal@17223
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246 movesys: // %ax = SYSSEG
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pascal@19400
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247 pushw %cs
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pascal@15188
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248 popw %ss
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pascal@19193
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249 shrw $4, %si
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pascal@19193
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250 addw %si, %bx
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pascal@17223
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251 subw %ax, %bx
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pascal@15188
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252 jnc forward
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pascal@15188
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253 addw %bp, %ax
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pascal@15188
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254 forward:
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pascal@15188
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255 movw %ax, %es
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pascal@17223
|
256 movw %ax, %dx
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pascal@17223
|
257 addw %bx, %dx
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pascal@17223
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258 movw %dx, %ds
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pascal@17223
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259 sbbw %dx, %dx // %dx = 0 : -1
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pascal@17223
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260 cmc // C = 1 : 0
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pascal@17223
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261 adcw %dx, %ax
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pascal@19193
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262 xorw %si, %si
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pascal@15188
|
263 xorw %di, %di
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pascal@15188
|
264 movb $8, %cl
|
pascal@15188
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265 rep
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pascal@15188
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266 movsw
|
pascal@15188
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267 decw %bp
|
pascal@15188
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268 jns forward
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pascal@15188
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269 #ifndef NO_CURSOR_DEFINITION
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pascal@15188
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270 movb $1, %ah
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pascal@15188
|
271 movb $0, %bh
|
pascal@15188
|
272 movb $0x20, %ch // 0x2000
|
pascal@15188
|
273 int $0x10
|
pascal@15188
|
274 #endif
|
pascal@15188
|
275 pushw %ss
|
pascal@15188
|
276 popw %ds
|
pascal@15188
|
277 jmp jmp_setup
|
pascal@15188
|
278 #endif
|
pascal@15188
|
279 putcdot:
|
pascal@15188
|
280 #ifdef PUTC
|
pascal@15188
|
281 movb $0x2E, %al
|
pascal@15188
|
282 putc:
|
pascal@15188
|
283 movb $0xE, %ah
|
pascal@15188
|
284 movw $7, %bx
|
pascal@15188
|
285 int $0x10
|
pascal@15188
|
286 #endif
|
pascal@15188
|
287 ret
|
pascal@15188
|
288
|
pascal@15188
|
289
|
pascal@15188
|
290 # read_sectors reads %di sectors into %es:0 buffer.
|
pascal@15188
|
291 # %es:0 is updated to the next memory location.
|
pascal@15188
|
292 # First, sectors are read sector by sector until
|
pascal@15188
|
293 # sector per track count is known. Then they are
|
pascal@15188
|
294 # read track by track.
|
pascal@15188
|
295 # Assume no error on first track.
|
pascal@15188
|
296
|
pascal@15188
|
297 #ifdef FLOPPY_1440K_ONLY
|
pascal@15188
|
298 #define FLOPPY_HEADS 2 /* 2 heads */
|
pascal@15188
|
299 #define FLOPPY_SECTORS 18 /* 18 sectors */
|
pascal@15188
|
300 #else
|
pascal@15188
|
301 #define FLOPPY_HEADS 2 /* 2 heads minimum */
|
pascal@15188
|
302 #define FLOPPY_SECTORS 9 /* 9 sectors minimum */
|
pascal@15188
|
303 #endif
|
pascal@15188
|
304
|
pascal@15188
|
305 check_limits:
|
pascal@15188
|
306 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
307 popw %dx
|
pascal@15188
|
308 #ifdef FLOPPY_SECTORS
|
pascal@15188
|
309 cmpb $FLOPPY_SECTORS+1, %cl # minimum sector count
|
pascal@15188
|
310 jb check_head
|
pascal@15188
|
311 #endif
|
pascal@15188
|
312 cmpb %al, %cl # max sector known ?
|
pascal@15188
|
313 ja next_head # no -> store it
|
pascal@15188
|
314 check_head:
|
pascal@15188
|
315 #ifdef FLOPPY_HEADS
|
pascal@15188
|
316 cmpb $FLOPPY_HEADS, %dh # 2 heads minimum
|
pascal@15188
|
317 jb check_cylinder
|
pascal@15188
|
318 #endif
|
pascal@15188
|
319 cmpb %ah, %dh # max head known ?
|
pascal@15188
|
320 ja next_cylinder # no -> store it
|
pascal@15188
|
321 check_cylinder:
|
pascal@15188
|
322 #endif
|
pascal@15188
|
323 pushaw
|
pascal@15188
|
324 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
325 cbw # %ah = 0
|
pascal@15188
|
326 #endif
|
pascal@15188
|
327 int $0x13 # reset controler
|
pascal@15188
|
328 popaw
|
pascal@15188
|
329 movb $1, %al # sector by sector...
|
pascal@15188
|
330 read_sectorslp:
|
pascal@15188
|
331 pushw %dx # some bios break dx...
|
pascal@15188
|
332 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
333 pushw %ax # limits
|
pascal@15188
|
334 subb %cl, %al # sectors remaining in track
|
pascal@15188
|
335 ja tolastsect
|
pascal@15188
|
336 movb $1, %al # 1 sector mini
|
pascal@15188
|
337 tolastsect:
|
pascal@15188
|
338 #else
|
pascal@15188
|
339 mov $FLOPPY_SECTORS+1, %al
|
pascal@15188
|
340 subb %cl, %al # sectors remaining in track
|
pascal@15188
|
341 #endif
|
pascal@15188
|
342 cbw
|
pascal@15188
|
343 cmpw %di, %ax
|
pascal@15188
|
344 jb more1trk
|
pascal@15188
|
345 movw %di, %ax # sectors to read
|
pascal@15188
|
346 more1trk:
|
pascal@15188
|
347 pushw %ax # save context
|
pascal@15188
|
348 movb $2, %ah # cmd: read chs
|
pascal@15188
|
349 int $0x13
|
pascal@15188
|
350 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
351 popw %dx # save %ax
|
pascal@15188
|
352 popw %ax # limits
|
pascal@15188
|
353 #else
|
pascal@15188
|
354 popw %ax # restore context
|
pascal@15188
|
355 popw %dx
|
pascal@15188
|
356 #endif
|
pascal@15188
|
357 jc check_limits
|
pascal@15188
|
358 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
359 xchgw %ax, %bp
|
pascal@15188
|
360 addw %dx,%cx # next sector
|
pascal@15188
|
361 movw %cx, %gs
|
pascal@15188
|
362 movw %es, %cx
|
pascal@15188
|
363 pushw %dx
|
pascal@15188
|
364 shlw $5, %dx
|
pascal@15188
|
365 addw %dx, %cx
|
pascal@15188
|
366 popw %dx
|
pascal@15188
|
367 subw %dx,%di # update sector counter
|
pascal@15188
|
368 popw %dx
|
pascal@15188
|
369 read_sectorsCX:
|
pascal@15188
|
370 movw %cx, %es # next location
|
pascal@15188
|
371 jz putcdot
|
pascal@15188
|
372 #else
|
pascal@15188
|
373 addw %ax,%cx # next sector
|
pascal@15188
|
374 movw %cx, %gs
|
pascal@15188
|
375 movw %es, %cx
|
pascal@15188
|
376 pushw %ax
|
pascal@15188
|
377 shlw $5, %ax
|
pascal@15188
|
378 addw %ax, %cx
|
pascal@15188
|
379 popw %ax
|
pascal@15188
|
380 subw %ax,%di # update sector counter
|
pascal@15188
|
381 read_sectorsCX:
|
pascal@15188
|
382 movw %cx, %es # next location
|
pascal@15188
|
383 jz putcdot
|
pascal@15188
|
384 #endif
|
pascal@15188
|
385 read_sectors:
|
pascal@15188
|
386 movw %gs, %cx
|
pascal@15188
|
387 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
388 # al is last sector+1
|
pascal@15188
|
389 # ah is last cylinder+1
|
pascal@15188
|
390 xchgw %ax, %bp
|
pascal@15188
|
391 #endif
|
pascal@15188
|
392 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
393 cmpb %al,%cl # reach sector limit ?
|
pascal@15188
|
394 jne bdendlp
|
pascal@15188
|
395 next_head:
|
pascal@15188
|
396 movb %cl,%al
|
pascal@15188
|
397 #else
|
pascal@15188
|
398 cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ?
|
pascal@15188
|
399 jne bdendlp
|
pascal@15188
|
400 #endif
|
pascal@15188
|
401 incb %dh # next head
|
pascal@15188
|
402 movb $1,%cl # first sector
|
pascal@15188
|
403 #ifndef FLOPPY_1440K_ONLY
|
pascal@15188
|
404 cmpb %ah, %dh # reach head limit ?
|
pascal@15188
|
405 jne bdendlp
|
pascal@15188
|
406 next_cylinder:
|
pascal@15188
|
407 movb %dh,%ah
|
pascal@15188
|
408 #else
|
pascal@15188
|
409 cmpb %cl,%dh # reach head limit ?
|
pascal@15188
|
410 je bdendlp
|
pascal@15188
|
411 #endif
|
pascal@15188
|
412 # NOTE : support 256 cylinders max
|
pascal@15188
|
413 incb %ch # next cylinder
|
pascal@18880
|
414 movb $0,%dh # first head
|
pascal@15188
|
415 read_first_sectors:
|
pascal@15188
|
416 bdendlp:
|
pascal@15188
|
417 jmp read_sectorslp
|
pascal@15188
|
418
|
pascal@15188
|
419 #ifdef HELP
|
pascal@15188
|
420 helpmsg:
|
pascal@15188
|
421 .ascii "No help available."
|
pascal@15188
|
422 .byte 13,10
|
pascal@15188
|
423 .byte 0
|
pascal@15188
|
424 #endif
|
pascal@17223
|
425 #ifdef CHECK_REALMODE
|
pascal@17223
|
426 .org 475
|
pascal@17223
|
427 realmode_expected:
|
pascal@17223
|
428 helpend:
|
pascal@17223
|
429 .ascii "386 real mode only."
|
pascal@17223
|
430 .byte 13,10,0
|
pascal@17223
|
431 #endif
|
pascal@15188
|
432 .org 497
|
pascal@17223
|
433 setup_sects:
|
pascal@17223
|
434 .byte 0
|
pascal@17223
|
435 .org 500
|
pascal@17223
|
436 syssize:
|
pascal@17223
|
437 .word 0
|
pascal@17223
|
438
|