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annotate level2/modules/kernel/fgcmdir.asm @ 3278:ea1afb494127

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defs: Add Bt.Sec for atari and corsham
author Tormod Volden <debian.tormod@gmail.com>
date Sat, 07 Mar 2020 23:52:40 +0100
parents 039ddb7c8ad7
children
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1 **************************************************
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2 * System Call: F$GCMDir
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3 *
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4 * Notes:
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5 * This system call is only used by OS9p1 to get rid of all
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6 * the empty spaces in the module directory to keep it small
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7 * and compact.
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8 *
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9 * Input: X = Address of allocation bitmap
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10 * D = Number of first bit to set
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11 * Y = Bit count (number of bits to set)
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12 *
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13 * Output: None
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14 *
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15 * Error: CC = C bit set; B = error code
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16 *
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17 FGCMDir ldx <D.ModDir get pointer to module directory start
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18 bra L0C1D skip ahead
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19 L0C17 ldu MD$MPDAT,x DAT initialized?
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20 beq L0C23 no it's empty skip ahead
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21 leax MD$ESize,x move to next entry
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22 L0C1D cmpx <D.ModEnd end of module directory?
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23 bne L0C17 no, keep looking
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24 bra L0C4B
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25 * Move all entrys up 1 slot in directory
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26 L0C23 tfr x,y move empty entry pointer to Y
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27 bra L0C2B
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28 L0C27 ldu MD$MPDAT,y
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29 bne L0C34
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30 L0C2B leay MD$ESize,y
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31 cmpy <D.ModEnd done complete directory?
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32 bne L0C27 no, keep going
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33 bra L0C49
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34 * Move entry up 1 slot in directory
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35 L0C34 equ *
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36 IFNE H6309
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37 ldw #MD$ESize
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38 tfm y+,x+
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39 ELSE
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40 ldu ,y++
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41 stu ,x++
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42 ldu ,y++
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43 stu ,x++
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44 ldu ,y++
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45 stu ,x++
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46 ldu ,y++
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47 stu ,x++
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48 ENDC
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49 L0C44 cmpy <D.ModEnd done complete directory?
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50 bne L0C27 no, keep going
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51
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52 L0C49 stx <D.ModEnd save new module directory end pointer
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53 * Shrink DAT table
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54 L0C4B ldx <D.ModDir+2 get module directory DAT end pointer
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55 bra L0C53
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56
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57 L0C4F ldu ,x
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58 beq L0C5B
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59 L0C53 leax -2,x Bump module ptr down by 2
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60 cmpx <D.ModDAT Hit beginning yet?
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61 bne L0C4F No, keep checking
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62 clrb Yes, return without error
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63 rts
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64
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65 L0C5B ldu -2,x
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66 bne L0C53
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67 tfr x,y
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68 bra L0C67
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69
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70 L0C63 ldu ,y
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71 bne L0C70
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72 L0C67 leay -2,y
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73 L0C69 cmpy <D.ModDAT
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74 bcc L0C63
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75 bra L0C81
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76 L0C70 leay 2,y
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77 ldu ,y
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78 stu ,x
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79 L0C76 ldu ,--y
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80 stu ,--x
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81 beq L0C87
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82 cmpy <D.ModDAT
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83 bne L0C76
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84
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85 L0C81 stx <D.ModDAT
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86 bsr L0C95
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87 clrb Yes, return without error
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88 rts
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89
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90 L0C87 leay 2,y
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91 leax 2,x
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92 bsr L0C95
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93 leay -4,y
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94 leax -2,x
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95 bra L0C69
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96
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97 * Update Module Dir Image Ptrs
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98 L0C95 pshs u
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99 ldu <D.ModDir
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100 bra L0CA4
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101 L0C9B cmpy MD$MPDAT,u same DAT ptrs?
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102 bne L0CA2 no, skip
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103 stx MD$MPDAT,u else update ptrs
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104 L0CA2 leau MD$ESize,u next entry
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105 L0CA4 cmpu <D.ModEnd last entry?
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106 bne L0C9B no
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107 puls u,pc else yes... return