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1 ********************************************************************
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2 * RAM - RAM Disk driver
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3 *
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4 * $Id$
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5 *
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6 * Ed. Comments Who YY/MM/DD
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7 * ------------------------------------------------------------------
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8 * 4 Given to me by Gene Heskett BGP 98/10/10
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9
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10 opt d68
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11 opt w110
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12 * set printer to 15 cpi!
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13 h6309 set 0
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14
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15 nam RAM
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16 ttl RAM Disk driver
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17
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18 **********************************************
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19 * A version of MyRam that can be asm to run on either
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20 * cpu. To switch to 6309 coding, use "h6309 set 1"
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21 * As no irq's are handled here, compensatory
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22 * changes to register offsets vs stack are not
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23 * required, therefore not used as defines either.
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24 * This does require an "os39defs" that can switch
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25 * register offsets etc according to the value
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26 * assigned to "h6309" and "TRUE", and a late
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27 * copy of Chris Burkes "xsm" assembler
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28
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29 ifp1
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30 use defsfile
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31 use rbfdefs
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32 endc
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33
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34 rev set $02
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35 edition set 4
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36
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37 ****************************************
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38 * this is required because regular
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39 * os-9 doesn't treat a native mode
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40 * marked module correctly, result
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41 * crash at worst, device table full
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42 * and nothing else works at best.
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43
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44 ifeq h6309-TRUE
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45 tylg set Drivr+Obj_309
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46 atrv set ReEnt+Ntv_mode+rev
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47 else
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48 tylg set Drivr+Objct
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49 atrv set ReEnt+rev
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50 endc
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51
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52 RD.MAP set -2 ,x of course!
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53 FDlocat set -3 loc for root FD
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54 DIRloca set -4 loc for root
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55 mod eom,name,tylg,atrv,start,size
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56 org 0
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57 u0000 rmb 2
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58 u0002 rmb 2
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59 u0004 rmb 2
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60 u0006 rmb 5
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61 u000B rmb 2
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62 u000D rmb 2 is RD.MAP & FDLocat
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63 u000F rmb 1
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64 u0010 rmb 32
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65 OurDesc rmb 2
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66 OurLink rmb 1 to control our self link
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67 Initstt rmb 2
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68 u0035 rmb 1
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69 u0036 rmb 2 number of 8k ramblocks needed
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70 u0038 rmb 2 only 2 used
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71 u003A rmb 2
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72 FatScra rmb 2 define FatScratch pad areas
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73 MP.SIZ rmb 2 ditto
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74 u0040 rmb 6
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75 u0046 rmb 10 actually 1, our tasknum
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76 u0050 rmb $C0-.
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77 u00C0 rmb $100-.
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78 size equ .
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79 mode fcb $BF
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80
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81 name fcs /RAM/
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82 fcb edition
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83
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84 start equ * the usual jump table for drivers
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85 lbra Init
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86 lbra Read
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87 lbra Write
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88 lbra SGtat these return errors
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89 lbra SGtat
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90 lbra Term
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91 Init equ *
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92 lbsr Initchk have we been init'd?
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93 bcs DoInit
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94 andcc #$FE clr the carry
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95 rts don't do twice
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96 DoInit inc OurLink,u so it'll get relinked
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97 andcc #$FE kill the carry if set
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98 leax u000F,u U is mem assigned area
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99 sty OurDesc,u save for later recovery
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100 pshs u,x building stack image -4
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101 * the stack image is:
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102 * sp+2=u, usually $4D00
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103 * sp =x, usually $4D0F
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104 ldu #$0028 location of time packet
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105 leax DD.DAT,x set x to target location
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106 ifne h6309-TRUE
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107 ldb #$05 number of byte to move
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108 GTime lda ,u+
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109 sta ,x+
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110 decb
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111 bne GTime
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112 endc
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113 ifeq h6309-TRUE
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114 ldw #$0005 we want to move 5 bytes
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115 tfm u+,x+ do it
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116 endc
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117 ldu 2,s
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118 ldx ,s
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119 ldb #$01
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120 stb u0006,u
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121 ldx <D.Proc <$50 current process ptr
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122 ldd P$User,x $08,x
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123 ldx ,s get x back
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124 * building a dummy sector zero's first $33 bytes
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125 * which is all assembled starting at offset $0F
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126 * of our initial scratchpad assignment
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127 std $0B,x DD.OWNer of dummy sector zero
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128 ldd #$0001
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129 std $06,x DD.BIT sectors per cluster
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130 lda $0D,y DD.ATT disk attributes
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131 sta $0D,x
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132 ldd <$1B,y IT.SCT
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133 std $01,x put totsecs in DD.TOT+1
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134
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135 * this could be simplicated to straight 6809 code
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136 ifeq h6309-TRUE
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137
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138 lsrd /2 but this is one cycle quicker at 3
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139 lsrd /4
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140 lsrd /8 8 sectors per byte
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141
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142 else
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143
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144 lsra where this is 2 per 8 bit register
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145 rorb or 4 cycles for full 16 bit shift
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146 lsra
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147 rorb
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148 lsra
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149 rorb
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150
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151 endc
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152 std RD.MAP,x s/b at $400D-E
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153 subd #$0001 it grabs extra page otherwise
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154 std $04,x DD.MAP (size) addr $13&14
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155 ****************************************************
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156 * set the location of the root FD.SCT intelligently!
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157 * this is where the devpack version failed miserably,
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158 * it was fixed at $0002, whole thing dead at 512k & up
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159 * furinstance, with sct=1300, d=$0260 right here,
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160 * therefore the FAT occupies 3 full sectors starting
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161 * at sector $01
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162 tfr a,b
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163 incb to next page so it skips sector zero
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164 incb and point to sector AFTER the FAT
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165 clra simplicating it
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166 std $09,x DD.DIR+1 fd location!
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167 * save a copy to locate the root FD
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168 stb FDlocat,x save copy for FD loc
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169 * save a copy to locate the root dir
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170 incb to next sector
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171 stb DIRloca,x s/b @ $400B-C
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172 *****************************************
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173 * now lets go get enough memory to build the FAT
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174 lda RD.MAP,x get msb, maybe $00
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175 * if over $800 sectors, regs.a won't be zero!
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176 inca round up increment to cover all
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177 clrb make even page boundary
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178 os9 F$SRqMem
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179 lbcs L0178
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180 ldx 2,s get U back
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181 std MP.SIZ,x and save it
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182 stu FatScra,x save FAT loc
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183 ldx ,s and get x back
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184 pshs u U is new mem area start -6
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185 * the stack image is:
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186 * sp+4=u, usually $4D00
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187 * sp+2=x, usually $4D0F
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188 * sp = usually $4000
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189 ldu $04,s get orig $4D00 u back
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190 * How many 8k blocks of mem do we need?
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191 ldd RD.MAP,x already been /8
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192 addd #$0003 we'll shift out, but need d2 carry
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193 ifeq h6309-TRUE
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194 lsrd /16
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195 lsrd /32 but its 5 cycles faster!
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196 else
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197 lsra
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198 rorb /16
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199 lsra
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200 rorb /32
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201 endc
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202
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203 * D is now how many blocks we need
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204 std <u0036,u 8k blocks ram needed
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205 leax >u00C0,u if <$20 blocks we
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206 cmpd #$0020 allow 512k in this map
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207 bls L008D if go, fits this page
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208 * else table of blocks won't fit from $C0-$FF,
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209 * ask for another (d*2) pages
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210
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211 ifeq h6309-TRUE
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212 asld else ask for more memory
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213 else
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214 lslb
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215 rola
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216 endc
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217 os9 F$SRqMem get new U
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218 lbcs L017C no more avail!
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219 * we'll use this instead of $xxC0
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220 * the stack image is:
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221 * sp+4=u, usually $4D00
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222 * sp+2=x, usually $4D0F
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223 * sp = usually $4000
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224 * save for later release
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225 leax ,u ok ,set x to new mem ptr
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226 ldu $04,s and get old u back
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227 L008D equ *
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228 stx <u0038,u $4EC0 for small disk
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229
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230 ifeq h6309-TRUE
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231 ldw <u0036,u number of blocks req
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232 else
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233 ldy <u0036,u
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234 endc
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235
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236 * Where did we start?
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237 L0094 ldb #$01 ask for one 8K block
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238 os9 F$AllRAM os9 manual doesn't say but
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239 lbcs L017C returns B=# of blk allocated
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240 std ,x++ make list of blocks
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241
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242 ifeq h6309-TRUE
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243 decw that we own for later release
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244 else
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245 leay -1,y
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246 endc
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247
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248 bne L0094
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249
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250 ifne h6309-TRUE
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251 ldy <OurDesc,u we destroyed our descriptor pointer
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252 endc
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253
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254 leax <u0040,u orig U here
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255 ldd [u0038,u] addr of # of blocks we own
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256 std <$40,x save at 4E80-81
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257 os9 F$AllTsk
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258 * this reserves a task #, then sets hardware
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259 * and DAT ram to this processes addr info
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260 lbcs L017C
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261 lda <D.SysTsk from dp reference
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262 ldb $06,x x our task number!
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263 * now we can move the dummy sector zero
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264 * to the first sector
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265 * the stack image now is:
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266 * sp+4=u, usually $4D00
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267 * sp+2=x, usually $4D0F
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268 * sp = usually $4000
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269 ldx $02,s get source ptr
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270 ldy #$001F byte count
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271 pshs u save this puppy, simplicates
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272 * the stack image is:
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273 * sp+6=u, usually $4D00
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274 * sp+4=x, usually $4D0F
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275 * sp+2= usually $4000
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276 * sp = our current U, $4D00?
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277 ldu #$0000 destination ptr
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278 os9 F$Move our dummy sector 0
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279 leax >L018A,pcr devices volume name
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280 leau ,y
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281 ldy #$000E length of name string etc
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282 * write 10 zeros for DD.BT-DD.NAM & the name section
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283 os9 F$Move and move that into sector zero
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284 puls u get our reference back
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285 * now lets make RBF a bit happier by copying
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286 * the opts section of the descriptor into
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287 * sector zero too.
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288 * the stack image is:
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289 * sp+4=u, usually $4D00
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290 * sp+2=x, usually $4D0F
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291 * sp+0= usually $4000
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292 ldx OurDesc,u
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293 leax $12,x point to opts in desc
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294 ldu #$003F point to start of opts in sector 0
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295 ldy #$000F
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296 os9 F$Move
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297 ldu 4,s
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298 * That moved enough info into what RBF thinks is sector
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299 * zero of this device to tell RBF what it is & how big,
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300 * where root dir is located etc.
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301 FatLoop equ *
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302 * Now lets move the FAT into ramdisk space
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303 * the stack image is:
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304 * sp+4=u, usually $4D00
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305 * sp+2=x, usually $4D0F
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306 * sp = usually $4000
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307 ldx $02,s test valid
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308 ldd RD.MAP,x saved bitmap siz
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309 * using size of bitmap for fat, save it in w
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310
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311 ifeq h6309-TRUE
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312 tfr d,w there is a method
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313 else
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314 std <u0002,u
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315 endc
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316
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317 * now add enough for even page boundary
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318 inca
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319 clrb now D is overall size
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320 ldx ,s bitmap addr
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321 * now we know how big it is
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322 leay d,x
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323 pshs y save ending addr (page)
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324 * the stack image is:
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325 * sp+6=u, usually $4D00
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326 * sp+4=x, usually $4D0F
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327 * sp+2= usually $4000
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328 * sp = top of fat, $4100
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329 L00DC equ *
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330
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331 ifeq h6309-TRUE
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332 leay w,x set y=where active fat ends
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333 else
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334 pshs d
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335 ldd <u0002,u
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336 leay d,x
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337 puls d
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338 endc
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339
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340 pshs y stack the end of active
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341 * the stack image is:
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342 * sp+8=u, usually $4D00
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343 * sp+6=x, usually $4D0F
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344 * sp+4= usually $4000
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345 * sp+2= top of fat, $4100
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346 * sp = end of active fat, $403D?
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347 ldx $04,s s/b the fat workspace base addr
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348 ldb #$FF allocate 1st 8 'sectors'
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349 L00E2 stb ,x+
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350 stb ,x+ make basic alloc $10 sectors
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351 L00E5 clr ,x+ and mark the rest clear
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352 cmpx ,s to end of active
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353 bcs L00E5 (was bcs)till the end of the fat
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354 * should show the end of the fat in x
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355 L00EA stb ,x+ then mark full
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356 cmpx $02,s for remainder of last page
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357 bcs L00EA (wonder if this s/b bls too!)
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358 * the stack image is:
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359 * sp+8=u, usually $4D00
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360 * sp+6=x, usually $4D0F
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361 * sp+4= usually $4000
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362 * sp+2= top of fat, $4100
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363 * sp = end of active fat, $403D?
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364 ldu $08,s get our base page back
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365 lda <D.SysTsk u00D0 note dp, is D.SysTsk
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366 ldb <u0046,u assigned P$Task
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367 pshs d save it for following move
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368 * the stack image is:
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369 * sp+A=u, usually $4D00
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370 * sp+8=x, usually $4D0F
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371 * sp+6= usually $4000
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372 * sp+4= top of fat, $4100
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373 * sp+2= end of active fat, $403D?
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374 * sp = our task numbers
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375 ldd $04,s get end of fat
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376 subd $06,s should leave fatsize in d
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377 tfr d,y size to y
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378 puls d restore our tsknums
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379 * the stack image is:
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380 * sp+8=u, usually $4D00
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381 * sp+6=x, usually $4D0F
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382 * sp+4= usually $4000
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383 * sp+2= top of fat, $4100
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384 * sp = end of active fat, $403D?
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385 ldu #$0100 start of FAT
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386 ldx $04,s
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387 os9 F$Move
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388 * we're done with the fat, its moved into the space
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389 * for the device. Now make a dummy FD in the same
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390 * memory area
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391 leas $02,s don't need end of active fat anymore
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392 MkRoot1 clr ,x+
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393 cmpx ,s clearing the mem,done w/fat
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394 bcs MkRoot1
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395 * the stack image is:
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396 * sp+6=u, usually $4D00
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397 * sp+4=x, usually $4D0F
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398 * sp+2= usually $4000
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399 * sp+0= top of fat, $4100
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400 ldx $02,s
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401 ldu $04,s
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402 * Ok, now lets make an FD sector for the root dir
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403 FDmaker equ *
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404 lda u000D,u DD.ATT
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405 sta ,x
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406 ldd u000B,u
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407 std $01,x
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408 ldb #$01 this is the link count
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409 stb $08,x
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410 ldd #$0040
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411 std $0B,x
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412 ldb DIRloca,u
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413 stb <$12,x
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414 ldd #$0010
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415 * Now a bit more intelligence applied
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416 subb DIRloca,u
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417 std <$13,x
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418 lda <D.SysTsk u00D0
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419 * the stack image is:
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420 * sp+6=u, usually $4D00
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421 * sp+4=x, usually $4D0F
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422 * sp+2= usually $4000
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423 * sp+0= top of fat, $4100
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424 ldu $06,s
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425 ldb <u0046,u
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426 pshs x
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427 * the stack image is:
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428 * sp+8=u, usually $4D00
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429 * sp+6=x, usually $4D0F
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430 * sp+4= usually $4000
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431 * sp+2= top of fat, $4100
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432 * sp = saved bottom of work area
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433 ldx $06,s
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434 * now set u to actual offset of FDlocation
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435
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436 ifeq h6309-TRUE
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437 lde FDlocat,x this is why we saved it
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438 clrf
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439 tfr w,u neat huh?
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440 else
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441 pshs d
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442 lda FDLocat,x
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443 clrb
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444 tfr d,u
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445 puls d
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446 endc
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|
447
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448 puls x
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449 * the stack image is:
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450 * sp+6=u, usually $4D00
|
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|
451 * sp+4=x, usually $4D0F
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452 * sp+2= usually $4000
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|
|
453 * sp+0= top of fat, $4100
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454 ldy #$0100
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455 os9 F$Move
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|
|
456 leay <$16,x why only $16, the dir is $40!
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457 pshs y
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458 * the stack image is:
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459 * sp+8=u, usually $4D00
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|
460 * sp+6=x, usually $4D0F
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461 * sp+4= usually $4000
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462 * sp+2= top of fat, $4100
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463 * sp = saved top of work area
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464 L0144 clr ,x+
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465 cmpx ,s
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466 bcs L0144
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467 leas $02,s get rid of that
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|
|
468 * the stack image is:
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469 * sp+6=u, usually $4D00
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|
470 * sp+4=x, usually $4D0F
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471 * sp+2= usually $4000
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|
472 * sp+0= top of fat, $4100
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|
473 ldx $02,s s/b right
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|
474 leay $40,x
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475 pshs y
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|
476 DClr clr ,x+
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477 cmpx ,s
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478 bcs DClr
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479 leas $02,s
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480 ldx $02,s get it back again
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481 ldd #$2EAE
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482 std ,x
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483 stb <$20,x
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|
484 * again, I've gotta apply some smarts to locating it
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485 ldx $04,s
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|
486 ldb FDlocat,x
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|
|
487 clra
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488 ldx $02,s
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|
489 std <$1E,x
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|
490 std <$3E,x
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|
491 lda <D.SysTsk u00D0
|
|
|
492 * the stack image is:
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|
|
493 * sp+6=u, usually $4D00
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|
|
494 * sp+4=x, usually $4D0F
|
|
|
495 * sp+2= usually $4000
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496 * sp+0= top of fat, $4100
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|
497 ldu $06,s
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|
498 ldb <u0046,u
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499 ldy #$0040
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500 ldx $04,s
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501
|
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|
502 ifeq h6309-TRUE
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|
503 lde DIRloca,x
|
|
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504 clrf
|
|
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505 tfr w,u
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506 else
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|
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507 pshs d
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508 lda DIRloca,x
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|
|
509 clrb
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510 tfr d,u
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|
511 puls d
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|
|
512 endc
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|
513
|
|
|
514 ldx $02,s
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|
|
515 os9 F$Move
|
|
|
516 ldx $04,s
|
|
|
517 lda RD.MAP,x
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|
518 inca
|
|
|
519 clrb
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|
|
520 leas $02,s
|
|
|
521 * the stack image is:
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|
522 * sp+4=u, usually $4D00
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|
|
523 * sp+2=x, usually $4D0F
|
|
|
524 * sp+0= usually $4000
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|
|
525 puls u
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|
|
526 * the stack image is:
|
|
|
527 * sp+2=u, usually $4D00
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|
|
528 * sp+0=x, usually $4D0F
|
|
|
529 os9 F$SRtMem give back FatScra
|
|
|
530 L0178 leas $02,s skip the x offset
|
|
|
531 puls u get orig assignment back!
|
|
|
532
|
|
|
533 ifeq h6309-TRUE
|
|
|
534 ldw <L018A,pcr
|
|
|
535 stw Initstt,u crash time?
|
|
|
536 else
|
|
|
537 pshs d
|
|
|
538 ldd <L018A,pcr
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|
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539 std Initstt,u
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540 puls d
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|
|
541 endc
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|
|
542
|
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543 clrb
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|
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544 rts puls pc,u U allready pulled, use rts
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|
|
545
|
|
|
546 L017C leas $04,s
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|
|
547 puls pc,u
|
|
|
548 L018A fcs /Gene's RamDisk/
|
|
|
549 Initchk equ *
|
|
|
550 ifeq h6309-TRUE
|
|
|
551 ldw Initstt,u <L018A,pcr
|
|
|
552 cmpw <L018A,pcr Initstt,u
|
|
|
553 beq InitOk
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|
|
554 else
|
|
|
555 pshs d
|
|
|
556 ldd Initstt,u
|
|
|
557 cmpd <L018A,pcr
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|
558 puls d
|
|
|
559 beq InitOk
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|
|
560 endc
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|
|
561 comb
|
|
|
562 ldb E$NotRdy else report error
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|
563 InitOk equ * relocated to give exit report
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|
|
564 rts
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|
|
565
|
|
|
566 Read equ *
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|
|
567 * First, have we been assigned any memory?
|
|
|
568 bsr Initchk
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|
|
569 * Now, if carry is clear, we have some memory, go
|
|
|
570 bcc ReadOk
|
|
|
571 rts return the error condition
|
|
|
572
|
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|
573 ReadOk tst OurLink,u
|
|
|
574 beq ReadOk1
|
|
|
575 bsr Linkus bsr ChkLink
|
|
|
576 ReadOk1 pshs u
|
|
|
577 bsr L01C2
|
|
|
578 bcs L01C0
|
|
|
579 tfr d,x
|
|
|
580 lda <u0046,u
|
|
|
581 ldb <D.SysTsk u00D0
|
|
|
582 ldu $08,y
|
|
|
583 bra L01B9
|
|
|
584 ************ A seperate linker
|
|
|
585 Linkus pshs x
|
|
|
586 ldx PD.DVT,y
|
|
|
587 inc V$USRS,x
|
|
|
588 * ldy OurDesc,u
|
|
|
589 * ldd M$Name,y
|
|
|
590 * leax d,y point to device name
|
|
|
591 * ldd <D.Proc this is temp
|
|
|
592 * pshs d save it as no time slicing
|
|
|
593 * ldd <D.SysPrc takes place while
|
|
|
594 * std <D.Proc this is in effect!
|
|
|
595 * clra any type/lang
|
|
|
596 * os9 I$Attach
|
|
|
597 * puls d
|
|
|
598 * std <D.Proc
|
|
|
599 * bcc LinkusOK
|
|
|
600 * os9 F$Exit take error with us
|
|
|
601 LinkusOK puls x and restore our entry values
|
|
|
602 clr OurLink,u so we don't re-attach us again
|
|
|
603 rts
|
|
|
604
|
|
|
605 Write equ *
|
|
|
606 bsr Initchk
|
|
|
607 bcc WriteOk
|
|
|
608 rts
|
|
|
609 WriteOk tst OurLink,u has it been done?
|
|
|
610 beq WriteOk1
|
|
|
611 bsr Linkus
|
|
|
612 WriteOk1 pshs u
|
|
|
613 bsr L01C2
|
|
|
614 bcs L01C0
|
|
|
615 pshs b,a
|
|
|
616 lda <D.SysTsk
|
|
|
617 ldb <u0046,u
|
|
|
618 ldx $08,y
|
|
|
619 puls u
|
|
|
620 L01B9 ldy #$0100
|
|
|
621 os9 F$Move
|
|
|
622 L01C0 puls pc,u
|
|
|
623 L01C2 pshs x
|
|
|
624 tstb
|
|
|
625 bne L01F1
|
|
|
626 L01C7 cmpx <u0010,u
|
|
|
627 bcc L01F1
|
|
|
628 tfr x,d
|
|
|
629
|
|
|
630 ifeq h6309-TRUE
|
|
|
631 lsrd /2
|
|
|
632 lsrd /4
|
|
|
633 lsrd /8
|
|
|
634 lsrd /16
|
|
|
635 else
|
|
|
636 lsra
|
|
|
637 rorb
|
|
|
638 lsra
|
|
|
639 rorb
|
|
|
640 lsra
|
|
|
641 rorb
|
|
|
642 lsra
|
|
|
643 rorb
|
|
|
644 endc
|
|
|
645
|
|
|
646 andb #$FE
|
|
|
647 L01D8 ldx <u0038,u
|
|
|
648 beq L01F5
|
|
|
649 ldd d,x
|
|
|
650 beq L01F5
|
|
|
651 leax <u0040,u
|
|
|
652 std <$40,x
|
|
|
653 os9 F$SetTsk
|
|
|
654 lda $01,s
|
|
|
655 anda #$1F
|
|
|
656 clrb
|
|
|
657 puls pc,x
|
|
|
658 L01F1 ldb #$F1 load the error code
|
|
|
659 bra L01F7
|
|
|
660 L01F5 ldb #$F4 load the error code
|
|
|
661 L01F7 orcc #$01 set the carry
|
|
|
662 puls pc,x and go home with the error
|
|
|
663 SGtat comb
|
|
|
664 ldb #$D0 #E$IllMode
|
|
|
665 rts
|
|
|
666 Term equ *
|
|
|
667 pshs u
|
|
|
668 ifeq h6309-TRUE
|
|
|
669 ldw <u0036,u
|
|
|
670 else
|
|
|
671 ldy <u0036,u
|
|
|
672 endc
|
|
|
673
|
|
|
674 ldu <u0038,u
|
|
|
675 beq L022A
|
|
|
676 L020A ldb #$01 is now the same as F$AllRam loop in
|
|
|
677 ldx ,u++ the Init routine
|
|
|
678 beq L0213 this fixed some loose
|
|
|
679 os9 F$DelRAM ends mmap showed
|
|
|
680 L0213 equ *
|
|
|
681
|
|
|
682 ifeq h6309-TRUE
|
|
|
683 decw was leay -$01,y
|
|
|
684 else
|
|
|
685 leay -1,y
|
|
|
686 endc
|
|
|
687
|
|
|
688 bne L020A
|
|
|
689 ldu ,s
|
|
|
690 ldd <u0036,u
|
|
|
691 cmpd #$0020
|
|
|
692 bls L022A
|
|
|
693
|
|
|
694 ifeq h6309-TRUE
|
|
|
695 lsld
|
|
|
696 else
|
|
|
697 lslb
|
|
|
698 rora
|
|
|
699 endc
|
|
|
700
|
|
|
701 ldu <u0038,u
|
|
|
702 os9 F$SRtMem
|
|
|
703 L022A clra to remove, clrb here
|
|
|
704 clrb
|
|
|
705 puls u
|
|
|
706 std Initstt,u and "comment" us out
|
|
|
707 rts
|
|
|
708
|
|
|
709 emod
|
|
|
710 eom equ *
|
|
|
711 end
|
|
|
712
|
|
|
713 * a parking place for the snoop code
|
|
|
714 * pshs cc
|
|
|
715 * os9 F$RegDmp lets take a look
|
|
|
716 * puls cc
|
|
|
717 * end of the snoop code, 4 %&$# lines!
|
|
|
718
|
