srt0.S revision 1.12
1 /* $NetBSD: srt0.S,v 1.12 2003/08/07 16:27:43 agc 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 movl #0x808,%d0 150 movc %d0,%cacr /* clear data freeze bit again */ 151 152 /* 153 * 68030 models 154 */ 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 moveq #0,%d0 /* now turn it back off */ 203 movec %d0,%cacr /* before we access any data */ 204 205 .long 0x4e7b0004 /* movc %d0,%itt0 */ 206 .long 0x4e7b0005 /* movc %d0,%itt1 */ 207 .long 0x4e7b0006 /* movc %d0,%dtt0 */ 208 .long 0x4e7b0007 /* movc %d0,%dtt1 */ 209 .word 0xf4d8 /* cinva bc */ 210 211 /* 212 * 68040 models 213 */ 214 215 lea _C_LABEL(mmuid),%a0 216 movl MMUCMD,%d0 /* get MMU ID */ 217 lsrl #MMUID_SHIFT,%d0 218 andl #MMUID_MASK,%d0 219 movl %d0,%a0@ /* save it */ 220 lea _C_LABEL(machineid),%a0 221 cmpb #MMUID_425_T,%d0 /* are we a 425t? */ 222 jeq isa425 223 cmpb #MMUID_425_S,%d0 /* how about 425s? */ 224 jeq isa425 225 cmpb #MMUID_425_E,%d0 /* or maybe a 425e? */ 226 jeq isa425 227 cmpb #MMUID_433_T,%d0 /* or a 433t? */ 228 jeq isa433 229 cmpb #MMUID_433_S,%d0 /* or a 433s? */ 230 jeq isa433 231 cmpb #MMUID_385,%d0 /* or a 385? */ 232 jeq isa385 233 movl #HP_380,%a0@ /* guess we are a 380 */ 234 jra ihpibcheck 235 isa425: 236 movl #HP_425,%a0@ 237 jra ihpibcheck 238 isa433: 239 movl #HP_433,%a0@ 240 jra ihpibcheck 241 isa385: 242 movl #HP_385,%a0@ 243 jra ihpibcheck 244 245 /* 246 * End 68040 section 247 */ 248 249 /* 250 * 68020 models 251 */ 252 253 is68020: 254 movl #HP_330,%a0@ /* consider a 330 for now */ 255 movl #1,MMUCMD /* a 68020, write HP MMU location */ 256 movl MMUCMD,%d0 /* read it back */ 257 btst #0,%d0 /* zero? */ 258 jeq ihpibcheck /* yes, a 330 */ 259 movl #HP_320,%a0@ /* no, consider a 320 for now */ 260 movl #0x80,MMUCMD /* set magic cookie */ 261 movl MMUCMD,%d0 /* read it back */ 262 btst #7,%d0 /* cookie still on? */ 263 jeq ihpibcheck /* no, just a 320 */ 264 movl #HP_350,%a0@ /* yes, a 350 */ 265 266 /* 267 * End 68020 section 268 */ 269 270 ihpibcheck: 271 movl #0,MMUCMD /* make sure MMU is off */ 272 btst #5,SYSFLAG /* do we have an internal HP-IB? */ 273 jeq boottype /* yes, continue */ 274 clrl _C_LABEL(internalhpib) /* no, clear the internal address */ 275 /* 276 * If this is a reboot, extract howto/bootdev stored by kernel 277 */ 278 boottype: 279 cmpw #12,BOOTTYPE /* is this a reboot (REQ_REBOOT)? */ 280 jne notreboot /* no, skip */ 281 lea MAXADDR,%a0 /* find last page */ 282 movl %a0@+,%d7 /* and extract howto, bootdev */ 283 movl %a0@+,%d6 /* from where doboot() left them */ 284 jra boot1 285 /* 286 * At this point we do not know which logical device the MSUS select 287 * code refers to so we cannot construct bootdev. So we just punt 288 * and let configure() construct it. 289 */ 290 notreboot: 291 moveq #0,%d6 /* make sure bootdev is invalid */ 292 cmpw #18,BOOTTYPE /* does the user want to interact? */ 293 jeq askme /* yes, go to it */ 294 moveq #0,%d7 /* default to RB_AUTOBOOT */ 295 jra boot1 296 askme: 297 moveq #3,%d7 /* default to RB_SINGLE|RB_ASKNAME */ 298 boot1: 299 movl %d6,_C_LABEL(bootdev) /* save bootdev and howto */ 300 movl %d7,_C_LABEL(howto) /* globally so all can access */ 301 movl LOWRAM,%d0 /* read lowram value from bootrom */ 302 /* 303 * Must preserve the scratch area for the BOOT ROM. 304 * Round up to the next 8k boundary. 305 */ 306 addl #((2*NBPG)-1),%d0 307 andl #-(2*NBPG),%d0 308 movl %d0,_C_LABEL(lowram) /* stash that value */ 309 start: 310 movl #_C_LABEL(edata),%a2 /* start of BSS */ 311 movl #_C_LABEL(end),%a3 /* end */ 312 1: 313 clrb %a2@+ /* clear BSS */ 314 cmpl %a2,%a3 /* done? */ 315 bne 1b /* no, keep going */ 316 jsr _C_LABEL(configure) /* configure critical devices */ 317 jsr _C_LABEL(main) /* lets go */ 318 GLOBAL(_rtt) 319 movl #3,_C_LABEL(howto) /* restarts get RB_SINGLE|RB_ASKNAME */ 320 jmp start 321 322 /* 323 * probe a location and see if it causes a bus error 324 */ 325 ENTRY_NOPROFILE(badaddr) 326 movl BUSERR,_C_LABEL(_bsave) /* save ROM bus error handler address */ 327 movl %sp,_C_LABEL(_ssave) /* and current stack pointer */ 328 movl #catchbad,BUSERR /* plug in our handler */ 329 movl %sp@(4),%a0 /* address to probe */ 330 movw %a0@,%d1 /* do it */ 331 movl _C_LABEL(_bsave),BUSERR /* if we got here, it did not fault */ 332 clrl %d0 /* return that this was not a bad */ 333 /* addr */ 334 rts 335 336 catchbad: 337 movl _C_LABEL(_bsave),BUSERR /* got a bus error, so restore */ 338 /* old handler */ 339 movl _C_LABEL(_ssave),%sp /* manually restore stack */ 340 moveq #1,%d0 /* indicate that we got a fault */ 341 rts /* return to caller of badaddr() */ 342 343 .data 344 GLOBAL(_bsave) 345 .long 0 346 347 GLOBAL(_ssave) 348 .long 0 349 350 ASENTRY_NOPROFILE(__trap) 351 moveml #0xFFFF,%sp@- /* save registers */ 352 movl %sp,%sp@- /* push pointer to frame */ 353 jsr _C_LABEL(trap) /* call C routine to deal with it */ 354 tstl %d0 355 jeq Lstop 356 addql #4,%sp 357 moveml %sp@+,#0x7FFF 358 addql #8,%sp 359 rte 360 Lstop: 361 stop #0x2700 /* stop cold */ 362 363 #ifdef ITECONSOLE 364 ASENTRY_NOPROFILE(nmi) 365 movw #18,BOOTTYPE /* mark as system switch */ 366 jsr _C_LABEL(kbdnmi) /* clear the interrupt, and */ 367 /* reset the system */ 368 stop #0 /* SCREEEECH! */ 369 #endif 370 371 ENTRY_NOPROFILE(call_req_reboot) 372 jmp 0x1A4 /* call ROM reboot function */ 373 rts /* XXX: just in case? */ 374 375 ENTRY_NOPROFILE(romout) 376 movl %sp@(4),%d0 /* line number */ 377 movl %sp@(8),%a0 /* string */ 378 jsr 0x150 /* do it */ 379 rts 380 381 /* 382 * _transfer(entry, howto, opendev, conscode, lowram, esym) 383 * 384 * Transfer control to the kernel. We also set up registers 385 * as older kernels expect. 386 */ 387 ENTRY_NOPROFILE(_transfer) 388 movl %sp@(8),%d7 /* howto */ 389 movl %sp@(12),%d6 /* opendev (compat) */ 390 movl %sp@(16),%d5 /* conscode (compat) */ 391 movl %sp@(20),%a5 /* lowram */ 392 movl %sp@(24),%a4 /* esym (compat) */ 393 394 movl %sp@(4),%a0 /* load entry point */ 395 jbsr %a0@ /* GO! */ 396
Indexes created Wed Oct 01 07:09:59 GMT 2025