Mercurial > hg > Members > kono > nitros9-code
annotate level1/modules/boot_1773.asm @ 1886:b151cc54904e
Added fragmented bootfile support. Added more labels and comments
to FD hardware code, optimized slightly.
author | boisy |
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date | Tue, 11 Oct 2005 20:43:21 +0000 (2005-10-11) |
parents | c96f594fe098 |
children | 5f8822fb42e0 |
rev | line source |
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230 | 1 ******************************************************************** |
1287 | 2 * Boot - WD1773 Boot module |
230 | 3 * |
4 * $Id$ | |
5 * | |
1287 | 6 * Edt/Rev YYYY/MM/DD Modified by |
7 * Comment | |
230 | 8 * ------------------------------------------------------------------ |
1287 | 9 * 4 1985/??/?? |
10 * Original Tandy distribution version. | |
11 * | |
12 * 6 1998/10/12 Boisy G. Pitre | |
13 * Obtained from L2 Upgrade archive, has 6ms step rate and disk timeout | |
14 * changes. | |
15 * | |
16 * 6r2 2003/05/18 Boisy G. Pitre | |
17 * Added '.' output for each sector for OS-9 L2 and NitrOS9 for | |
18 * Mark Marlette (a special request :). | |
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19 * |
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20 * 6r3 2003/08/31 Robert Gault |
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21 * Put BLOB-stop code in place, changed orb #$30 to orb #$28 |
1520 | 22 * |
23 * 6r4 2004/02/17 Rodney Hamilton | |
24 * Minor optimizations, improvements in source comments | |
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25 * |
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26 * 7 2005/10/10 Boisy G. Pitre |
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27 * Added fragmented bootfile support |
230 | 28 |
210
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Boot is adapted from OS-9 Level Two boot module, now boots from
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29 nam Boot |
1287 | 30 ttl WD1773 Boot module |
0 | 31 |
1287 | 32 IFP1 |
0 | 33 use defsfile |
1287 | 34 ENDC |
0 | 35 |
1520 | 36 * FDC Control Register bits at $FF40 |
37 HALTENA equ %10000000 | |
38 SIDESEL equ %01000000 DRVSEL3 if no DS drives | |
39 DDEN equ %00100000 | |
40 READY equ %00010000 READY for Tandy WD1773-based controllers | |
1516 | 41 MOTON equ %00001000 |
1520 | 42 DRVSEL2 equ %00000100 |
1516 | 43 DRVSEL1 equ %00000010 |
44 DRVSEL0 equ %00000001 | |
45 | |
1709 | 46 * Default Boot is from drive 0 |
1520 | 47 BootDr set DRVSEL0 |
1709 | 48 IFEQ DNum-1 |
49 BootDr set DRVSEL1 Alternate boot from drive 1 | |
50 ENDC | |
51 IFEQ DNum-2 | |
52 BootDr set DRVSEL2 Alternate boot from drive 2 | |
53 ENDC | |
54 IFEQ DNum-3 | |
55 BootDr set SIDESEL Alternate boot from drive 3 | |
56 ENDC | |
1520 | 57 |
58 * WD17x3 DPort offsets | |
59 CONTROL equ 0 | |
60 CMDREG equ 8+0 write-only | |
61 STATREG equ CMDREG read-only | |
1516 | 62 TRACKREG equ 8+1 |
63 SECTREG equ 8+2 | |
64 DATAREG equ 8+3 | |
65 | |
1515 | 66 * Sector Size |
67 SECTSIZE equ 256 | |
68 | |
1520 | 69 * Step Rates: |
70 * $00 = 6ms | |
71 * $01 = 12ms | |
72 * $02 = 20ms | |
73 * $03 = 30ms | |
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74 STEP set $00 |
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75 |
1287 | 76 tylg set Systm+Objct |
0 | 77 atrv set ReEnt+rev |
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78 rev set $00 |
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79 edition set 7 |
230 | 80 |
0 | 81 mod eom,name,tylg,atrv,start,size |
230 | 82 |
1520 | 83 * NOTE: these are U-stack offsets, not DP |
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84 seglist rmb 2 pointer to segment list |
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85 blockloc rmb 2 pointer to memory requested |
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86 blockimg rmb 2 duplicate of the above |
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87 bootloc rmb 3 sector pointer; not byte pointer |
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88 bootsize rmb 2 size in bytes |
1515 | 89 drvsel rmb 1 |
1514 | 90 currtrak rmb 1 |
91 ddtks rmb 1 no. of sectors per track | |
92 dblsided rmb 1 | |
1520 | 93 side rmb 1 side 2 flag |
0 | 94 size equ . |
95 | |
96 name fcs /Boot/ | |
230 | 97 fcb edition |
0 | 98 |
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99 start orcc #IntMasks ensure IRQs are off (necessary?) |
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100 leas -size,s |
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101 tfr s,u get pointer to data area |
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102 pshs u save pointer to data area |
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103 |
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104 ************ START OF DEVICE-SPECIFIC INIT *********** |
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105 * HWInit - Initialize the device |
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106 HWInit |
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107 ldy Address,pcr get hardware address |
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108 lda #%11010000 ($D0) Force Interrupt (stops any command in progress) |
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109 sta CMDREG,y write command to command register |
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110 lbsr Delay2 delay 54~ |
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111 lda STATREG,y clear status register |
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112 lda #$FF |
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113 sta currtrak,u set current track to 255 |
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114 leax >NMIRtn,pcr point to NMI routine |
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115 IFGT Level-1 |
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116 stx <D.NMI save address |
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117 ELSE |
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118 stx >D.XNMI+1 save address |
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119 lda #$7E |
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120 sta >D.XNMI |
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121 ENDC |
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122 lda #MOTON turn on drive motor |
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123 ora WhichDrv,pcr |
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124 sta CONTROL,y |
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125 * MOTOR ON spin-up delay loop (~307 mSec) |
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126 IFGT Level-1 |
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127 ldd #50000 |
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128 ELSE |
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129 ldd #25000 |
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130 ENDC |
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131 IFNE H6309 |
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132 nop |
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133 ENDC |
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134 L003A nop |
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135 nop |
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136 IFNE H6309 |
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137 nop |
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138 nop |
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139 nop |
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140 ENDC |
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141 subd #$0001 |
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142 bne L003A |
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143 ************ END OF DEVICE-SPECIFIC INIT *********** |
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144 |
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145 * Request memory for LSN0 |
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146 ldd #256 get sector/fd buffer |
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147 os9 F$SRqMem get it! |
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148 bcs error2 |
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149 bsr getpntr restore U to point to our statics |
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150 |
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151 * Read LSN0 |
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152 clrb MSB sector |
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153 ldx #0 LSW sector |
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154 lbsr HWRead read LSN 0 |
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155 bcs error branch if error |
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156 |
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157 ifgt Level-1 |
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158 lda #'0 --- loaded in LSN0' |
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159 jsr <D.BtBug --- |
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160 endc |
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161 |
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162 * Pull relevant values from LSN0 |
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163 lda DD.TKS,x number of tracks on this disk |
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164 sta ddtks,u |
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165 lda DD.FMT,x disk format byte |
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166 sta dblsided,u |
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167 lda DD.BT,x os9boot pointer |
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168 sta bootloc,u |
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169 ldd DD.BT+1,x LSW of 24 bit address |
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170 std bootloc+1,u |
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171 ldd DD.BSZ,x os9boot size in bytes |
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172 beq FragBoot if zero, do frag boot |
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173 std bootsize,u |
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174 * Old style boot -- make a fake FD segment |
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175 leax FD.SEG,x |
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176 addd #$00FF round up to next page |
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177 * Important note: We are making an assumption that the upper 8 bits of the |
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178 * FDSL.B field will always be zero. That is a safe assumption, since an |
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179 * FDSL.B value of $00FF would mean the file is 65280 bytes. A bootfile |
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180 * under NitrOS-9 cannot be this large, and therefore this assumption |
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181 * is safe. |
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182 sta FDSL.B+1,x save file size |
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183 lda bootloc,u |
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184 sta FDSL.A,x |
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185 ldd bootloc+1,u |
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186 std FDSL.A+1,x save LSN of file (contiguous) |
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187 clr FDSL.S,x make next segment entry 0 |
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188 clr FDSL.S+1,x |
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189 clr FDSL.S+2,x |
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190 ldd bootsize,u |
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191 bra GrabBootMem |
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192 |
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193 Back2Krn ldx blockimg,u pointer to start of os9boot in memory |
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194 clrb clear carry |
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195 ldd bootsize,u |
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196 error2 leas 2+size,s reset the stack same as PULS U |
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197 rts return to kernel |
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198 |
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199 * Error point - return allocated memory and then return to kernel |
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200 error |
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201 * Return memory allocated for sector buffers |
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202 ldd #256 |
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203 ldu blockloc,u |
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204 os9 F$SRtMem |
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205 bra error2 |
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206 |
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207 * Routine to save off alloced mem from F$SRqMem into blockloc,u and restore |
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208 * the statics pointer in U |
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209 getpntr tfr u,d save pointer to requested memory |
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210 ldu 2,s recover pointer to data stack |
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211 std blockloc,u |
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212 rts |
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213 |
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214 * NEW! Fragmented boot support! |
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215 FragBoot ldb bootloc,u MSB fd sector location |
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216 ldx bootloc+1,u LSW fd sector location |
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217 lbsr HWRead get fd sector |
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218 ldd FD.SIZ+2,x get file size (we skip first two bytes) |
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219 std bootsize,u |
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220 leax FD.SEG,x point to segment table |
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221 |
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222 GrabBootMem |
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223 ifgt Level-1 |
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224 os9 F$BtMem |
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225 else |
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226 os9 F$SRqMem |
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227 endc |
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228 bcs error |
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229 bsr getpntr |
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230 std blockimg,u |
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231 |
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232 * Get os9boot into memory |
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233 BootLoop stx seglist,u update segment list |
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234 ldb FDSL.A,x MSB sector location |
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235 BL2 ldx FDSL.A+1,x LSW sector location |
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236 bne BL3 |
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237 tstb |
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238 beq Back2Krn |
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239 BL3 lbsr HWRead |
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240 inc blockloc,u point to next input sector in mem |
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241 |
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242 ifgt Level-1 |
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243 lda #'. Show .' |
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244 jsr <D.BtBug |
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245 endc |
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246 |
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247 ldx seglist,u get pointer to segment list |
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248 dec FDSL.B+1,x get segment size |
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249 beq NextSeg if <=0, get next segment |
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250 |
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251 ldd FDSL.A+1,x update sector location by one to 24bit word |
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252 addd #1 |
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253 std FDSL.A+1,x |
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254 ldb FDSL.A,x |
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255 adcb #0 |
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256 stb FDSL.A,x |
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257 bra BL2 |
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258 |
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259 NextSeg leax FDSL.S,x advance to next segment entry |
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260 bra BootLoop |
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261 |
0 | 262 |
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263 |
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264 ************************************************************ |
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265 ************************************************************ |
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266 * Hardware-Specific Booter Area * |
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267 ************************************************************ |
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268 ************************************************************ |
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269 |
210
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270 |
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271 DoDDns lda #DDEN+MOTON double density enable and motor on |
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272 ora WhichDrv,pcr OR in selected drive |
1516 | 273 sta drvsel,u save drive selection byte |
274 clr currtrak,u clear current track | |
0 | 275 lda #$05 |
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276 lbsr SetTrak Set the track to the head we want |
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277 ldb #0+STEP RESTORE cmd |
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278 lbra Talk2FDC send command and wait for it to complete |
0 | 279 |
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280 * |
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281 * HWRead - Read a 256 byte sector from the device |
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282 * Entry: Y = hardware address |
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283 * B = bits 23-16 of LSN |
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284 * X = bits 15-0 of LSN |
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285 * blockloc,u = ptr to 256 byte sector |
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286 * Exit: X = ptr to data (i.e. ptr in blockloc,u) |
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287 * |
1287 | 288 * Read a sector from the 1773 |
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289 * Entry: B,X = LSN to read |
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290 HWRead lda #$91 |
1515 | 291 bsr L00DF else branch subroutine |
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292 bcs HWRRts branch if error |
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293 ldx blockloc,u get buffer pointer in X for caller |
1287 | 294 clrb |
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295 HWRRts rts |
1287 | 296 |
297 L00D7 bcc L00DF | |
0 | 298 pshs x,b,a |
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299 bsr DoDDns |
0 | 300 puls x,b,a |
1515 | 301 L00DF pshs x,b,a save LSN, command |
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302 bsr ReadSect |
1520 | 303 puls x,b,a restore LSN, command |
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304 bcc HWRRts branch if OK |
1287 | 305 lsra |
306 bne L00D7 | |
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307 ReadSect bsr Seek2Sect seek to the sector stored in X |
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308 bcs HWRRts if error, return to caller |
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309 ldx blockloc,u get address of buffer to fill |
1515 | 310 orcc #IntMasks mask interrupts |
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311 pshs x save X |
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312 ldx #$FFFF |
1516 | 313 ldb #%10000000 ($80) READ SECTOR command |
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314 stb CMDREG,y write to command register |
1520 | 315 ldb drvsel,u (DDEN+MOTORON+BootDr) |
316 * NOTE: The 1773 FDC multiplexes the write precomp enable and ready | |
317 * signals on the ENP/RDY pin, so the READY bit must always be ON for | |
318 * read and seek commands. (from the FD502 FDC Service Manual) | |
319 orb #DDEN+READY set DDEN+READY bits ($30) | |
320 tst side,u are we on side 2? | |
1287 | 321 beq L0107 |
1520 | 322 orb #SIDESEL set side 2 bit |
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323 L0107 stb CONTROL,y |
1520 | 324 lbsr Delay2 delay 54~ |
325 orb #HALTENA HALT enable ($80) | |
326 * lda #%00000010 RESTORE cmd ($02) | |
1516 | 327 *L0111 bita >DPort+STATREG |
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328 * bne L0123 |
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329 * leay -$01,y |
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330 * bne L0111 |
1515 | 331 * lda drvsel,u |
1520 | 332 * sta >DPort+CONTROL |
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333 * puls y |
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334 * bra L0138 |
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335 stb CONTROL,y |
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336 nop |
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337 nop |
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338 * bra L0123 |
1516 | 339 |
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340 ldx ,s get X saved earlier |
1516 | 341 * Sector READ Loop |
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342 L0123 lda DATAREG,y read from WD DATA register |
0 | 343 sta ,x+ |
1520 | 344 * stb >DPort+CONTROL |
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345 nop |
1287 | 346 bra L0123 |
1520 | 347 * RVH NOTE: This ONLY works for double density boot disks! The Tandy |
348 * controllers internally gate HALT enable with the DDEN bit, which | |
349 * means that reading a single-density boot disk will not generate the | |
350 * NMI signal needed to exit the read loop! Single-density disks must | |
351 * use a polled I/O loop instead. | |
1515 | 352 NMIRtn leas R$Size,s adjust stack |
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353 puls x |
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354 ldb STATREG,y read WD STATUS register |
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355 bitb #$9C any errors? |
1516 | 356 * bitb #$04 LOST DATA bit set? |
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357 beq r@ branch if not |
1516 | 358 * beq ChkErr branch if not |
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359 L0138 comb else we will return error |
210
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360 ldb #E$Read |
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361 r@ rts |
0 | 362 |
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363 Seek2Sect |
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364 lda #MOTON permit alternate drives |
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365 ora WhichDrv,pcr permit alternate drives |
1516 | 366 sta drvsel,u save byte to static mem |
1520 | 367 clr side,u start on side 1 |
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368 tfr x,d move LSN into D |
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369 cmpd #$0000 zero? |
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370 beq L016C branch if so |
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371 clr ,-s else clear space on stack |
1520 | 372 tst dblsided,u double sided disk? |
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373 beq SnglSid branch if not |
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374 bra DblSid |
1515 | 375 * Double-sided code |
1520 | 376 L0152 com side,u flag side 2 |
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377 bne DblSid |
210
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378 inc ,s |
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379 DblSid subb ddtks,u |
210
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380 sbca #$00 |
1287 | 381 bcc L0152 |
382 bra L0168 | |
383 L0160 inc ,s | |
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384 SnglSid subb ddtks,u subtract sectors per track from B |
210
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385 sbca #$00 |
1287 | 386 bcc L0160 |
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387 L0168 addb #18 add sectors per track (should this be ddtks?) |
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388 puls a get current track indicator off of stack |
1287 | 389 L016C incb |
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390 stb SECTREG,y save in sector register |
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391 SetTrak ldb currtrak,u get current track in B |
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392 stb TRACKREG,y save in track register |
1520 | 393 cmpa currtrak,u same as A? |
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394 beq rtsok branch if so |
1514 | 395 sta currtrak,u |
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396 sta DATAREG,y |
1516 | 397 ldb #$10+STEP SEEK command |
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398 bsr Talk2FDC send command to controller |
0 | 399 pshs x |
1520 | 400 * Seek Delay |
401 ldx #$222E delay ~39 mSec (78mS L1) | |
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402 SeekDly leax -$01,x |
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403 bne SeekDly |
0 | 404 puls x |
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|
405 rtsok clrb |
1287 | 406 rts |
1516 | 407 |
408 *ChkErr bitb #$98 evaluate WD status (READY, RNF, CRC err) | |
409 * bne L0138 | |
410 * clrb | |
411 * rts | |
412 | |
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413 Talk2FDC bsr DoCMD issue FDC cmd, wait 54~ |
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414 FDCLoop ldb STATREG,y get status |
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415 bitb #$01 still BUSY? |
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416 bne FDCLoop loop until command completes |
1287 | 417 rts |
1516 | 418 |
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419 * Issue command and wait 54 clocks |
1520 | 420 * Controller requires a min delay of 14uS (DD) or 28uS (SD) |
421 * following a command write before status register is valid | |
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422 DoCMD bsr SelNSend |
1515 | 423 * Delay branches |
1520 | 424 * 54 clock delay including bsr (=30uS/L2,60us/L1) |
1515 | 425 Delay2 |
1363 | 426 IFNE H6309 |
1287 | 427 nop |
428 nop | |
429 ENDC | |
1515 | 430 lbsr Delay3 |
431 Delay3 | |
1363 | 432 IFNE H6309 |
1287 | 433 nop |
434 nop | |
435 ENDC | |
1515 | 436 lbsr Delay4 |
437 Delay4 | |
1363 | 438 IFNE H6309 |
1287 | 439 nop |
440 ENDC | |
441 rts | |
210
6bf55704c623
Boot is adapted from OS-9 Level Two boot module, now boots from
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442 |
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443 * Select And Send |
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444 * Entry: B = command byte |
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445 SelNSend lda drvsel,u |
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446 sta CONTROL,y |
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447 stb CMDREG,y |
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448 rts |
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449 |
1166 | 450 IFGT Level-1 |
1287 | 451 * Filler to get $1D0 |
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452 Filler fill $39,$1D0-3-2-1-* |
1166 | 453 ENDC |
0 | 454 |
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455 Address fdb DPort |
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456 WhichDrv fcb BootDr |
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457 |
0 | 458 emod |
459 eom equ * | |
48 | 460 end |