srt0.S revision 1.14
1 /* $NetBSD: srt0.S,v 1.14 2006/07/19 19:29:02 tsutsui Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: srt0.c 1.18 92/12/21$ 36 * 37 * @(#)srt0.c 8.1 (Berkeley) 6/10/93 38 */ 39 /* 40 * Copyright (c) 1988 University of Utah. 41 * 42 * This code is derived from software contributed to Berkeley by 43 * the Systems Programming Group of the University of Utah Computer 44 * Science Department. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Utah $Hdr: srt0.c 1.18 92/12/21$ 75 * 76 * @(#)srt0.c 8.1 (Berkeley) 6/10/93 77 */ 78 79 /* 80 * Startup code for standalone system 81 */ 82 83 /* For machineid and mmuid constants */ 84 #include <machine/hp300spu.h> 85 86 /* For _C_LABEL() and friends. */ 87 #include <machine/asm.h> 88 89 STACK = 0xfffff000 /* below the ROM page */ 90 BOOTTYPE = 0xfffffdc0 91 LOWRAM = 0xfffffdce 92 SYSFLAG = 0xfffffed2 /* system flags */ 93 MSUS = 0xfffffedc /* MSUS (?) structure */ 94 VECTORS = 0xfffffee0 /* beginning of jump vectors */ 95 NMIRESET = 0xffffff9c /* reset vector */ 96 BUSERR = 0xfffffffc 97 MAXADDR = 0xfffff000 98 NBPG = 4096 99 MMUCMD = 0x005f400c /* MMU command/status register */ 100 101 .data 102 GLOBAL(bootdev) 103 .long 0 104 105 GLOBAL(howto) 106 .long 0 107 108 GLOBAL(lowram) 109 .long 0 110 111 GLOBAL(machineid) 112 .long 0 113 114 GLOBAL(mmuid) 115 .long 0 116 117 .text 118 ASENTRY_NOPROFILE(begin) 119 movl #STACK,%sp 120 moveq #47,%d0 /* # of vectors - 1 */ 121 movl #VECTORS+2,%a0 /* addr part of first vector */ 122 1: 123 movl #_ASM_LABEL(__trap),%a0@ /* make it direct to __trap */ 124 addql #6,%a0 /* move to next vector addr */ 125 dbf %d0,1b /* go til done */ 126 #ifdef ITECONSOLE 127 movl #NMIRESET,%a0 /* NMI keyboard reset addr */ 128 movl #nmi,%a0@ /* catch in reset routine */ 129 #else 130 /* 131 * Built without ITE console support; leave the ROM's NMI 132 * vector in place, so the system will still reset if a 133 * keyboard NMI is issued. 134 */ 135 #endif 136 137 /* 138 * Determine our SPU type and look for internal HP-IB 139 */ 140 lea _C_LABEL(machineid),%a0 141 movl #0x808,%d0 142 movc %d0,%cacr /* clear and disable on-chip cache(s) */ 143 movl #0x200,%d0 /* data freeze bit */ 144 movc %d0,%cacr /* only exists on 68030 */ 145 movc %cacr,%d0 /* read it back */ 146 tstl %d0 /* zero? */ 147 jeq not68030 /* yes, we have 68020/68040 */ 148 149 /* 150 * 68030 models 151 */ 152 153 movl #0x808,%d0 154 movc %d0,%cacr /* clear data freeze bit again */ 155 156 movl #0x80,MMUCMD /* set magic cookie */ 157 movl MMUCMD,%d0 /* read it back */ 158 btst #7,%d0 /* cookie still on? */ 159 jeq not370 /* no, 360 or 375 */ 160 movl #HP_370,%a0@ /* consider a 370 for now */ 161 movl #0,MMUCMD /* clear magic cookie */ 162 movl MMUCMD,%d0 /* read it back */ 163 btst #7,%d0 /* still on? */ 164 jeq ihpibcheck /* no, a 370 */ 165 movl #HP_340,%a0@ /* yes, must be a 340 */ 166 jra ihpibcheck 167 168 not370: 169 movl #HP_360,%a0@ /* type is at least a 360 */ 170 movl #0,MMUCMD /* clear magic cookie2 */ 171 movl MMUCMD,%d0 /* read it back */ 172 btst #16,%d0 /* still on? */ 173 jeq ihpibcheck /* no, a 360 */ 174 lea _C_LABEL(mmuid),%a0 175 lsrl #MMUID_SHIFT,%d0 /* save MMU ID */ 176 andl #MMUID_MASK,%d0 177 movl %d0,%a0@ 178 lea _C_LABEL(machineid),%a0 179 cmpb #MMUID_345,%d0 /* are we a 345? */ 180 jeq isa345 181 cmpb #MMUID_375,%d0 /* how about a 375? */ 182 jeq isa375 183 movl #HP_400,%a0@ /* must be a 400 */ 184 jra ihpibcheck 185 isa345: 186 movl #HP_345,%a0@ 187 jra ihpibcheck 188 isa375: 189 movl #HP_375,%a0@ 190 jra ihpibcheck 191 192 /* 193 * End of 68030 section 194 */ 195 196 not68030: 197 bset #31,%d0 /* data cache enable bit */ 198 movc %d0,%cacr /* only exists on 68040 */ 199 movc %cacr,%d0 /* read it back */ 200 tstl %d0 /* zero? */ 201 beq is68020 /* yes, we have 68020 */ 202 203 /* 204 * 68040 models 205 */ 206 207 moveq #0,%d0 /* now turn it back off */ 208 movec %d0,%cacr /* before we access any data */ 209 210 .long 0x4e7b0004 /* movc %d0,%itt0 */ 211 .long 0x4e7b0005 /* movc %d0,%itt1 */ 212 .long 0x4e7b0006 /* movc %d0,%dtt0 */ 213 .long 0x4e7b0007 /* movc %d0,%dtt1 */ 214 .word 0xf4d8 /* cinva bc */ 215 216 lea _C_LABEL(mmuid),%a0 217 movl MMUCMD,%d0 /* get MMU ID */ 218 lsrl #MMUID_SHIFT,%d0 219 andl #MMUID_MASK,%d0 220 movl %d0,%a0@ /* save it */ 221 lea _C_LABEL(machineid),%a0 222 cmpb #MMUID_425_T,%d0 /* are we a 425t? */ 223 jeq isa425 224 cmpb #MMUID_425_S,%d0 /* how about 425s? */ 225 jeq isa425 226 cmpb #MMUID_425_E,%d0 /* or maybe a 425e? */ 227 jeq isa425 228 cmpb #MMUID_433_T,%d0 /* or a 433t? */ 229 jeq isa433 230 cmpb #MMUID_433_S,%d0 /* or a 433s? */ 231 jeq isa433 232 cmpb #MMUID_385,%d0 /* or a 385? */ 233 jeq isa385 234 movl #HP_380,%a0@ /* guess we are a 380 */ 235 jra ihpibcheck 236 isa425: 237 movl #HP_425,%a0@ 238 jra ihpibcheck 239 isa433: 240 movl #HP_433,%a0@ 241 jra ihpibcheck 242 isa385: 243 movl #HP_385,%a0@ 244 jra ihpibcheck 245 246 /* 247 * End 68040 section 248 */ 249 250 /* 251 * 68020 models 252 */ 253 254 is68020: 255 movl #HP_330,%a0@ /* consider a 330 for now */ 256 movl #1,MMUCMD /* a 68020, write HP MMU location */ 257 movl MMUCMD,%d0 /* read it back */ 258 btst #0,%d0 /* zero? */ 259 jeq ihpibcheck /* yes, a 330 */ 260 movl #HP_320,%a0@ /* no, consider a 320 for now */ 261 movl #0x80,MMUCMD /* set magic cookie */ 262 movl MMUCMD,%d0 /* read it back */ 263 btst #7,%d0 /* cookie still on? */ 264 jeq ihpibcheck /* no, just a 320 */ 265 movl #HP_350,%a0@ /* yes, a 350 */ 266 267 /* 268 * End 68020 section 269 */ 270 271 ihpibcheck: 272 movl #0,MMUCMD /* make sure MMU is off */ 273 btst #5,SYSFLAG /* do we have an internal HP-IB? */ 274 jeq boottype /* yes, continue */ 275 clrl _C_LABEL(internalhpib) /* no, clear the internal address */ 276 /* 277 * If this is a reboot, extract howto/bootdev stored by kernel 278 */ 279 boottype: 280 cmpw #12,BOOTTYPE /* is this a reboot (REQ_REBOOT)? */ 281 jne notreboot /* no, skip */ 282 lea MAXADDR,%a0 /* find last page */ 283 movl %a0@+,%d7 /* and extract howto, bootdev */ 284 movl %a0@+,%d6 /* from where doboot() left them */ 285 jra boot1 286 /* 287 * At this point we do not know which logical device the MSUS select 288 * code refers to so we cannot construct bootdev. So we just punt 289 * and let configure() construct it. 290 */ 291 notreboot: 292 moveq #0,%d6 /* make sure bootdev is invalid */ 293 cmpw #18,BOOTTYPE /* does the user want to interact? */ 294 jeq askme /* yes, go to it */ 295 moveq #0,%d7 /* default to RB_AUTOBOOT */ 296 jra boot1 297 askme: 298 moveq #3,%d7 /* default to RB_SINGLE|RB_ASKNAME */ 299 boot1: 300 movl %d6,_C_LABEL(bootdev) /* save bootdev and howto */ 301 movl %d7,_C_LABEL(howto) /* globally so all can access */ 302 movl LOWRAM,%d0 /* read lowram value from bootrom */ 303 /* 304 * Must preserve the scratch area for the BOOT ROM. 305 * Round up to the next 8k boundary. 306 */ 307 addl #((2*NBPG)-1),%d0 308 andl #-(2*NBPG),%d0 309 movl %d0,_C_LABEL(lowram) /* stash that value */ 310 start: 311 movl #_C_LABEL(edata),%a2 /* start of BSS */ 312 movl #_C_LABEL(end),%a3 /* end */ 313 1: 314 clrb %a2@+ /* clear BSS */ 315 cmpl %a2,%a3 /* done? */ 316 bne 1b /* no, keep going */ 317 jsr _C_LABEL(configure) /* configure critical devices */ 318 jsr _C_LABEL(main) /* lets go */ 319 GLOBAL(_rtt) 320 movl #3,_C_LABEL(howto) /* restarts get RB_SINGLE|RB_ASKNAME */ 321 jmp start 322 323 /* 324 * probe a location and see if it causes a bus error 325 */ 326 ENTRY_NOPROFILE(badaddr) 327 movl BUSERR,_C_LABEL(_bsave) /* save ROM bus error handler address */ 328 movl %sp,_C_LABEL(_ssave) /* and current stack pointer */ 329 movl #catchbad,BUSERR /* plug in our handler */ 330 movl %sp@(4),%a0 /* address to probe */ 331 movw %a0@,%d1 /* do it */ 332 movl _C_LABEL(_bsave),BUSERR /* if we got here, it did not fault */ 333 clrl %d0 /* return that this was not a bad */ 334 /* addr */ 335 rts 336 337 catchbad: 338 movl _C_LABEL(_bsave),BUSERR /* got a bus error, so restore */ 339 /* old handler */ 340 movl _C_LABEL(_ssave),%sp /* manually restore stack */ 341 moveq #1,%d0 /* indicate that we got a fault */ 342 rts /* return to caller of badaddr() */ 343 344 .data 345 GLOBAL(_bsave) 346 .long 0 347 348 GLOBAL(_ssave) 349 .long 0 350 351 ASENTRY_NOPROFILE(__trap) 352 moveml #0xFFFF,%sp@- /* save registers */ 353 movl %sp,%sp@- /* push pointer to frame */ 354 jsr _C_LABEL(trap) /* call C routine to deal with it */ 355 tstl %d0 356 jeq Lstop 357 addql #4,%sp 358 moveml %sp@+,#0x7FFF 359 addql #8,%sp 360 rte 361 Lstop: 362 stop #0x2700 /* stop cold */ 363 364 #ifdef ITECONSOLE 365 ASENTRY_NOPROFILE(nmi) 366 movw #18,BOOTTYPE /* mark as system switch */ 367 jsr _C_LABEL(kbdnmi) /* clear the interrupt, and */ 368 /* reset the system */ 369 stop #0 /* SCREEEECH! */ 370 #endif 371 372 ENTRY_NOPROFILE(call_req_reboot) 373 jmp 0x1A4 /* call ROM reboot function */ 374 rts /* XXX: just in case? */ 375 376 ENTRY_NOPROFILE(romout) 377 movl %sp@(4),%d0 /* line number */ 378 movl %sp@(8),%a0 /* string */ 379 jsr 0x150 /* do it */ 380 rts 381 382 /* 383 * _transfer(entry, howto, opendev, conscode, lowram, esym) 384 * 385 * Transfer control to the kernel. We also set up registers 386 * as older kernels expect. 387 */ 388 ENTRY_NOPROFILE(_transfer) 389 movl %sp@(8),%d7 /* howto */ 390 movl %sp@(12),%d6 /* opendev (compat) */ 391 movl %sp@(16),%d5 /* conscode (compat) */ 392 movl %sp@(20),%a5 /* lowram */ 393 movl %sp@(24),%a4 /* esym (compat) */ 394 395 movl %sp@(4),%a0 /* load entry point */ 396 jbsr %a0@ /* GO! */ 397
Indexes created Tue Sep 30 20:09:53 GMT 2025