Mercurial > hg > Members > kono > nitros9-code
annotate 3rdparty/booters/boot_wd1002.asm @ 460:255b5bab1b72
Now use fill pseud-op
| author | boisy |
|---|---|
| date | Thu, 26 Sep 2002 15:26:12 +0000 |
| parents | 3e3f1f79ba00 |
| children |
| rev | line source |
|---|---|
| 45 | 1 ******************************************************************** |
| 392 | 2 * Boot - Eliminator WD1002-05 Boot Module |
| 45 | 3 * |
| 4 * $Id$ | |
| 5 * | |
| 6 * WD 1002-05 OS-9 Boot Subroutine (called by OS9p1) | |
| 7 * Copyright 1988, 1989 Bruce Isted | |
| 8 * All Rights Reserved | |
| 9 * | |
| 10 * Ed. Comments Who YY/MM/DD | |
| 11 * ------------------------------------------------------------------ | |
| 12 * 2 Created by Bruce Isted BRI ??/??/?? | |
| 13 | |
| 14 nam Boot | |
| 392 | 15 ttl Eliminator WD1002-05 Boot Module |
| 45 | 16 |
| 17 * These equates should be set before assembly: | |
| 18 FDStep equ $09 see Step Rate Table | |
| 19 HDStep equ $0F see step rate table | |
| 20 | |
| 21 *Step Rate Table: | |
| 22 *+------------------+------------------+------------------+------------------+ | |
| 23 *! Value=FD/HD Rate ! Value=FD/HD Rate ! Value=FD/HD Rate ! Value=FD/HD Rate ! | |
| 24 *+------------------+------------------+------------------+------------------+ | |
| 25 *! $00=40mS/7.5mS ! $04=16mS/5.5mS ! $08=08mS/3.5mS ! $0C=03mS/1.5mS ! | |
| 26 *! $01=25mS/7.0mS ! $05=14mS/5.0mS ! $09=06mS/3.0mS ! $0D=02mS/1.0mS ! | |
| 27 *! $02=20mS/6.5mS ! $06=12mS/4.5mS ! $0A=05mS/2.5mS ! $0E=01mS/0.5mS ! | |
| 28 *! $03=18mS/6.0mS ! $07=10mS/4.0mS ! $0B=04mS/2.0mS ! $0F=15uS/ 35uS ! | |
| 29 *+------------------+------------------+------------------+------------------+ | |
| 30 | |
| 31 ifp1 | |
| 32 use defsfile | |
| 33 endc | |
| 34 | |
| 35 * These equates should not have to be changed: | |
| 36 BEdtn equ 2 | |
| 37 BVrsn equ 1 | |
| 38 MaxCyls equ 1024 maximum cylinders supported | |
| 39 MaxHeads equ 16 maximum heads supported | |
| 40 MaxSctrs equ 64 maximum sectors per track supported | |
| 41 PhysDrv0 equ %10000000 SDH register mask for HD0 | |
| 42 PhysDrv1 equ %10001000 SDH register mask for HD1 | |
| 43 PhysDrv2 equ %10010000 SDH register mask for HD2 | |
| 44 PhysDrv3 equ %00011000 SDH register mask for FD0 | |
| 45 PhysDrv4 equ %00011010 SDH register mask for FD1 | |
| 46 PhysDrv5 equ %00011100 SDH register mask for FD2 | |
| 47 PhysDrv6 equ %00011110 SDH register mask for FD3 | |
| 48 ReadSctr equ %00100000 read sector command | |
| 49 Restore equ %00010000 base restore command | |
| 50 SelfTest equ %10010000 WD 1002-05 diagnostic test command | |
| 51 | |
| 52 * HCA memory map: | |
| 53 org 0 | |
| 54 WDData rmb 2 WD 1002-05 sector buffer/task files | |
| 55 rmb 2 reserved - do not use | |
| 56 PA equ . PIA PA offset | |
| 57 DDRA rmb 1 PIA DDRA offset | |
| 58 CRA rmb 1 PIA CRA offset | |
| 59 PB equ . PIA PB offset | |
| 60 DDRB rmb 1 PIA DDRB offset | |
| 61 CRB rmb 1 PIA CRB offset | |
| 62 | |
| 63 * WD 1002-05 register definitions: | |
| 64 org 0 | |
| 65 WDBuff rmb 1 WD 1002-05 sector buffer address | |
| 66 ErrReg equ . error register address (read) | |
| 67 WPCReg rmb 1 write precomp register address (write) | |
| 68 SctrCnt rmb 1 sector count register address | |
| 69 SctrReg rmb 1 sector number register address | |
| 70 CylLow rmb 1 cylinder LSB register address | |
| 71 CylHigh rmb 1 cylinder MSB register address | |
| 72 SDHReg rmb 1 Size/Drive/Head register address | |
| 73 StatReg equ . status register address (read) | |
| 74 CmdReg rmb 1 command register address (write) | |
| 75 | |
| 76 org 0 | |
| 77 U.BSZ rmb 2 boot file size | |
| 78 U.BSct rmb 1 number of sectors in boot file | |
| 79 U.BT rmb 3 boot file start LSN | |
| 80 U.BtStrt rmb 2 boot file start address | |
| 81 U.CrtCyl rmb 2 current cylinder number | |
| 82 U.CrtSct rmb 1 current sector number | |
| 83 U.CrtSid rmb 1 current side (head) number | |
| 84 U.Restor rmb 1 restore command incl. step rate code | |
| 85 U.SDH rmb 1 base WD Size/Drive/Head register copy | |
| 86 U.Sides rmb 1 number of disk sides (heads) | |
| 87 U.SPC rmb 2 sectors per cylinder | |
| 88 U.SPT rmb 2 sectors per track | |
| 89 U.StSctr rmb 1 start sector number (HD=0, FD=1) | |
| 90 BootMem equ . | |
| 91 | |
| 92 mod BEnd,BNam,Systm+Objct,ReEnt+BVrsn,BExec,$00 | |
| 93 BNam fcs "Boot" | |
| 94 fcb BEdtn edition number | |
| 95 | |
| 96 * base SDH register table | |
| 97 SDHTable equ * | |
| 98 fcb PhysDrv0,PhysDrv1,PhysDrv2 base SDH for hard drives | |
| 99 fcb PhysDrv3,PhysDrv4,PhysDrv5,PhysDrv6 base SDH for floppys | |
| 100 *** | |
| 101 * Boot subroutine module | |
| 102 * | |
| 103 * INPUT: none | |
| 104 * | |
| 105 * OUTPUT: [D]=size of bootstrap file | |
| 106 * [X]=start address of bootstrap file in memory | |
| 107 * y,u registers altered | |
| 108 * | |
| 109 * ERROR OUTPUT: [CC]=carry set | |
| 110 * [B]=error code | |
| 111 BExec ldy <D.WDAddr get HCA base address (set by auto-boot EPROM) | |
| 112 cmpy #$FF40 base address too low? | |
| 113 blo UnitErr yes, go report error... | |
| 114 cmpy #$FF7F base address too high? | |
| 115 bhi UnitErr yes, go report error... | |
| 116 lda <D.WDBtDr get boot drive number (set by auto-boot EPROM | |
| 117 cmpa #$07 legal drive number? | |
| 118 blo InitPIA yes, go initialize PIA... | |
| 119 UnitErr ldb #E$Unit | |
| 120 coma | |
| 121 rts | |
| 122 | |
| 123 DumpRead clr PB,y set WD address to sector buffer | |
| 124 DumpR0 lda WDData,y get a byte from WD sector buffer | |
| 125 decb done yet? | |
| 126 bne DumpR0 no, go dump another byte | |
| 127 rts | |
| 128 LSN0Info ldb #DD.FMT load number of bytes to dump | |
| 129 bsr DumpRead go dump LSN0 up to DD.FMT | |
| 130 lda WDData,y get DD.FMT (disk density, sides) | |
| 131 anda #$01 mask out all but disk sides bit | |
| 132 inca correction to bit coding | |
| 133 sta U.Sides,u save disk sides (not valid if HD > 2 heads) | |
| 134 ldd WDData,y get DD.SPT (sectors per track) | |
| 135 std U.SPT,u | |
| 136 ldb #DD.BT-DD.RES load number of bytes to dump | |
| 137 bsr DumpRead go dump LSN0 from DD.RES to DD.BT | |
| 138 lda WDData,y get DD.BT (boot file start LSN) MSB | |
| 139 sta U.BT,u | |
| 140 ldd WDData,y get DD.BT (boot file start LSN) LSBs | |
| 141 std U.BT+1,u | |
| 142 ldd WDData,y get DD.BSZ (boot file size) | |
| 143 std U.BSZ,u | |
| 144 ldb U.StSctr,u floppy drive? (start sector = 1) | |
| 145 bne GotInfo yes, sides info OK, go return | |
| 146 ldb #DD.OPT+(PD.SID-PD.OPT)-DD.DAT load number of bytes to dump | |
| 147 bsr DumpRead go dump LSN0 from DD.DAT to number of sides in option table | |
| 148 lda WDData,y get number of sides from DD.OPT section | |
| 149 sta U.Sides,u | |
| 150 GotInfo rts | |
| 151 | |
| 152 InitPIA clr CRA,y enable PIA DDRA | |
| 153 ldd #$033E [A]=DDRA: PA bits 7-2 = inputs, bits 1-0 = outputs | |
| 154 std DDRA,y [B]=CRA: PIA CA2 out high, PA slct, CA1 low to high, no IRQs | |
| 155 clr CRB,y enable PIA DDRB | |
| 156 lda #$FF [A]=DDRB: PB bits 7-0 all outputs | |
| 157 std DDRB,y [B]=CRB: PIA CB2 out high, PB slct, CB1 low to high, no IRQs | |
| 158 leas -BootMem,s open up some space for variables | |
| 159 leau ,s point [U] to start of variables | |
| 160 ldb #BootMem number of bytes to clear | |
| 161 leax ,u point [X] to start of variables | |
| 162 ClrLoop clr ,x+ initialize a byte to 0 | |
| 163 decb done yet? | |
| 164 bne ClrLoop no, go clear another byte | |
| 165 lda #SelfTest WD 1002-05 internal diagnostic command | |
| 166 lbsr CmdUpdat go issue WD command, ensure everything is ready... | |
| 167 bcs ReadErr error, go report it... | |
| 168 lda #Restore!($0F&^HDStep) default to Restore with HD step rate | |
| 169 ldb <D.WDBtDr get boot drive number | |
| 170 cmpb #$03 hard drive? | |
| 171 blo SaveRstr yes, go save HD Restore command... | |
| 172 inc U.StSctr,u set start sector to 1 for floppy disks | |
| 173 lda #Restore!($0F&^FDStep) get Restore with FD step rate | |
| 174 SaveRstr sta U.Restor,u | |
| 175 leax SDHTable,pc | |
| 176 lda b,x get base SDH register | |
| 177 sta U.SDH,u save it... | |
| 178 * restore head to track 0 | |
| 179 lbsr SetupTF go update WD task files (except command) | |
| 180 lda U.Restor,u load WD restore command code | |
| 181 lbsr CmdUpdat go issue WD command | |
| 182 bcs ReadErr error, go report it... | |
| 183 * read cylinder 0, head 0, first sector | |
| 184 lbsr GetSctr go set up, issue read command | |
| 185 bcs ReadErr error, go report it... | |
| 186 bsr LSN0Info go get disk info from LSN0 | |
| 187 ldd U.BSZ,u get boot file size/cylinder offset number | |
| 188 bne ChkInfo must be boot file size, go check other LSN0 info... | |
| 189 ldd U.BT+1,u get offset cylinder number | |
| 190 beq ReadErr must not be boot disk, go report error... | |
| 191 cmpd #MaxCyls offset cylinder number OK? | |
| 192 bhs ReadErr no, go return error... | |
| 193 std U.CrtCyl,u save offset cylinder | |
| 194 * read offset cylinder, head 0, first sector | |
| 195 lbsr GetSctr go set up, issue read command | |
| 196 bcs ReadErr error, go exit... | |
| 197 lbsr LSN0Info go get disk info from offset LSN0 | |
| 198 ldd U.BSZ,u get boot file size | |
| 199 beq ReadErr must not be boot disk, go report error... | |
| 200 * check LSN0 info | |
| 201 ChkInfo ldd U.SPT,u get sectors per track | |
| 202 beq ReadErr 0 sectors per track, go return error | |
| 203 cmpd #MaxSctrs sectors per track OK? | |
| 204 bhi ReadErr no, go return error | |
| 205 lda U.Sides,u get disk sides (heads) | |
| 206 beq ReadErr 0 sides, go return error | |
| 207 cmpa #MaxHeads number of heads OK? | |
| 208 bhi ReadErr no, go return error | |
| 209 mul calculate sectors per cylinder | |
| 210 std U.SPC,u save sectors per cylinder | |
| 211 ldd U.BSZ,u get boot file size | |
| 212 addd #$00FF round up to even sector... | |
| 213 sta U.BSct,u save number of sectors in boot file | |
| 214 * calculate boot file start cylinder, head, & sector | |
| 215 ldd U.BT+1,u get boot file LSN LSBs | |
| 216 ldx U.CrtCyl,u get current (offset) cylinder number | |
| 217 CylLoop subd U.SPC,u subtract sectors/cylinder | |
| 218 blo ChkBtMSB [D] underflow, go check boot file LSN MSB | |
| 219 CylLoop0 leax 1,x increment current cylinder number | |
| 220 bne CylLoop no overflow, go do another subtraction | |
| 221 ReadErr ldb #E$Read | |
| 222 coma set Carry for error | |
| 223 leas BootMem,s restore stack pointer | |
| 224 rts | |
| 225 ChkBtMSB tst U.BT,u boot file LSN MSB = 0? | |
| 226 beq GotCyl yes, go determine head number | |
| 227 dec U.BT,u decrement boot file LSN MSB | |
| 228 bra CylLoop0 go on... | |
| 229 GotCyl addd U.SPC,u restore sector number | |
| 230 stx U.CrtCyl,u save current cylinder number | |
| 231 TrkLoop subd U.SPT,u subtract sectors/track | |
| 232 blo GotSide [D] underflow, go save current sector number | |
| 233 inc U.CrtSid,u increment current side number | |
| 234 bra TrkLoop go do another subtraction | |
| 235 GotSide addd U.SPT,u restore sector number | |
| 236 stb U.CrtSct,u save it | |
| 237 * request boot file memory | |
| 238 pshs u save data pointer | |
| 239 ldd U.BSZ,u get boot file size | |
| 240 os9 F$SRqMem | |
| 241 tfr u,x move start address into [X] | |
| 242 puls u recover data pointer | |
| 243 bcs BtExit0 go return F$SRqMem error | |
| 244 stx U.BtStrt,u save boot file start address | |
| 245 ldd U.CrtCyl,u get cylinder number | |
| 246 bra ChkCyl go check cylinder & get first sector | |
| 247 | |
| 248 * load boot file into memory | |
| 249 BootLoad inc U.CrtSct,u move on to next sector | |
| 250 lda U.SPT+1,u get sectors per track LSB (MSB is always 0) | |
| 251 cmpa U.CrtSct,u done track? | |
| 252 bhi LoadSctr no, go get sector | |
| 253 clr U.CrtSct,u reset current sector number to 0 | |
| 254 inc U.CrtSid,u move on to next side | |
| 255 lda U.CrtSid,u get side number | |
| 256 cmpa U.Sides,u done cylinder? | |
| 257 blo LoadSctr no, go get sector | |
| 258 clr U.CrtSid,u reset side number to 0 | |
| 259 ldd U.CrtCyl,u get cylinder number | |
| 260 addd #1 move on to next cylinder | |
| 261 std U.CrtCyl,u save cylinder number | |
| 262 ChkCyl cmpd #MaxCyls cylinder number OK? | |
| 263 bhs ReadErr no, go return error | |
| 264 LoadSctr bsr GetSctr go get current sector from WD 1002-05 | |
| 265 bcs ReadErr error, go exit | |
| 266 clrb transfer 256 bytes | |
| 267 stb PB,y set WD sector buffer address | |
| 268 ReadLoop lda WDData,y get byte from WD 1002-05 | |
| 269 sta ,x+ save byte to buffer | |
| 270 decb done yet? | |
| 271 bne ReadLoop no, go get another byte | |
| 272 dec U.BSct,u count down boot file sectors remaining | |
| 273 bne BootLoad | |
| 274 clrb clear carry | |
| 275 ldd U.BSZ,u get boot file size | |
| 276 ldx U.BtStrt,u get boot file start address | |
| 277 BtExit0 leas BootMem,s restore stack pointer | |
| 278 rts | |
| 279 | |
| 280 GetSctr bsr SetupTF go set up WD task files (except command) | |
| 281 lda #ReadSctr load WD read sector command code | |
| 282 CmdUpdat ldb #CmdReg load WD command register address | |
| 283 bsr TFUpdat go issue command... | |
| 284 BusyWait ldb #StatReg | |
| 285 stb PB,y set WD status register address | |
| 286 BusyW0 ldb WDData,y get WD 1002-05 status | |
| 287 bitb #%00000010 valid data? (WD 1002-05 powered & connected?) | |
| 288 bne BWErr no, go report error... | |
| 289 tstb ensure [CC] sign flag is current | |
| 290 bmi BusyW0 yes, go check again | |
| 291 ldb WDData,y get valid controller status | |
| 292 rorb rotate error bit into carry | |
| 293 bcc NoError | |
| 294 ldb #ErrReg | |
| 295 stb PB,y set WD error register address | |
| 296 ldb WDData,y get error register contents | |
| 297 bne BWErr | |
| 298 NoError clrb | |
| 299 rts | |
| 300 BWErr comb error, set [CC] Carry... | |
| 301 rts | |
| 302 | |
| 303 SetupTF ldd #$01*256+SctrCnt single sector commands only | |
| 304 bsr TFUpdat | |
| 305 lda U.CrtCyl,u get current cylinder number MSB | |
| 306 ldb #CylHigh | |
| 307 bsr TFUpdat | |
| 308 lda U.CrtCyl+1,u get current cylinder number LSB | |
| 309 ldb #CylLow | |
| 310 bsr TFUpdat | |
| 311 lda U.CrtSct,u get current sector number | |
| 312 adda U.StSctr,u add offset... | |
| 313 ldb #SctrReg | |
| 314 bsr TFUpdat | |
| 315 clrb default extended head disabled | |
| 316 lda U.CrtSid,u get current side (head) number | |
| 317 cmpa #$08 extended head? | |
| 318 blo StdHead no, go on... | |
| 319 incb set enable code | |
| 320 anda #$07 mask out all but standard head number | |
| 321 StdHead stb PA,y set extended head enable/disable | |
| 322 ora U.SDH,u mask in base SDH copy | |
| 323 ldb #SDHReg | |
| 324 TfUpdat stb PB,y set WD register address | |
| 325 sta WDData,y write data to WD 1002-05 | |
| 326 rts | |
| 327 | |
| 328 * pad Boot module out to $01D0 exactly | |
|
459
3e3f1f79ba00
Sources now use 'fill' pseudo-op to fill out for L2 modules
boisy
parents:
392
diff
changeset
|
329 Pad fill $39,$1D0-3-* |
| 45 | 330 |
| 331 emod | |
| 332 BEnd equ * | |
| 333 end | |
| 334 |