srt0.S revision 1.8
1 /* $NetBSD: srt0.S,v 1.8 1999/07/31 21:49:03 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah $Hdr: srt0.c 1.18 92/12/21$ 41 * 42 * @(#)srt0.c 8.1 (Berkeley) 6/10/93 43 */ 44 45 /* 46 * Startup code for standalone system 47 */ 48 49 /* For machineid and mmuid constants */ 50 #include <machine/hp300spu.h> 51 52 /* For _C_LABEL() and friends. */ 53 #include <machine/asm.h> 54 55 STACK = 0xfffff000 | below the ROM page 56 BOOTTYPE = 0xfffffdc0 57 LOWRAM = 0xfffffdce 58 SYSFLAG = 0xfffffed2 | system flags 59 MSUS = 0xfffffedc | MSUS (?) structure 60 VECTORS = 0xfffffee0 | beginning of jump vectors 61 NMIRESET = 0xffffff9c | reset vector 62 BUSERR = 0xfffffffc 63 MAXADDR = 0xfffff000 64 NBPG = 4096 65 MMUCMD = 0x005f400c | MMU command/status register 66 67 .data 68 GLOBAL(bootdev) 69 .long 0 70 71 GLOBAL(howto) 72 .long 0 73 74 GLOBAL(lowram) 75 .long 0 76 77 GLOBAL(machineid) 78 .long 0 79 80 GLOBAL(mmuid) 81 .long 0 82 83 .text 84 ASENTRY_NOPROFILE(begin) 85 movl #STACK,sp 86 moveq #47,d0 | # of vectors - 1 87 movl #VECTORS+2,a0 | addr part of first vector 88 1: 89 movl #_ASM_LABEL(__trap),a0@ | make it direct to __trap 90 addql #6,a0 | move to next vector addr 91 dbf d0,1b | go til done 92 #ifdef ITECONSOLE 93 movl #NMIRESET,a0 | NMI keyboard reset addr 94 movl #nmi,a0@ | catch in reset routine 95 #else 96 /* 97 * Built without ITE console support; leave the ROM's NMI 98 * vector in place, so the system will still reset if a 99 * keyboard NMI is issued. 100 */ 101 #endif 102 103 /* 104 * Determine our SPU type and look for internal HP-IB 105 */ 106 lea _C_LABEL(machineid),a0 107 movl #0x808,d0 108 movc d0,cacr | clear and disable on-chip cache(s) 109 movl #0x200,d0 | data freeze bit 110 movc d0,cacr | only exists on 68030 111 movc cacr,d0 | read it back 112 tstl d0 | zero? 113 jeq not68030 | yes, we have 68020/68040 114 115 movl #0x808,d0 116 movc d0,cacr | clear data freeze bit again 117 118 /* 119 * 68030 models 120 */ 121 122 movl #0x80,MMUCMD | set magic cookie 123 movl MMUCMD,d0 | read it back 124 btst #7,d0 | cookie still on? 125 jeq not370 | no, 360 or 375 126 movl #HP_370,a0@ | consider a 370 for now 127 movl #0,MMUCMD | clear magic cookie 128 movl MMUCMD,d0 | read it back 129 btst #7,d0 | still on? 130 jeq ihpibcheck | no, a 370 131 movl #HP_340,a0@ | yes, must be a 340 132 jra ihpibcheck 133 134 not370: 135 movl #HP_360,a0@ | type is at least a 360 136 movl #0,MMUCMD | clear magic cookie2 137 movl MMUCMD,d0 | read it back 138 btst #16,d0 | still on? 139 jeq ihpibcheck | no, a 360 140 lea _C_LABEL(mmuid),a0 141 lsrl #MMUID_SHIFT,d0 | save MMU ID 142 andl #MMUID_MASK,d0 143 movl d0,a0@ 144 lea _C_LABEL(machineid),a0 145 cmpb #MMUID_345,d0 | are we a 345? 146 jeq isa345 147 cmpb #MMUID_375,d0 | how about a 375? 148 jeq isa375 149 movl #HP_400,a0@ | must be a 400 150 jra ihpibcheck 151 isa345: 152 movl #HP_345,a0@ 153 jra ihpibcheck 154 isa375: 155 movl #HP_375,a0@ 156 jra ihpibcheck 157 158 /* 159 * End of 68030 section 160 */ 161 162 not68030: 163 bset #31,d0 | data cache enable bit 164 movc d0,cacr | only exists on 68040 165 movc cacr,d0 | read it back 166 tstl d0 | zero? 167 beq is68020 | yes, we have 68020 168 moveq #0,d0 | now turn it back off 169 movec d0,cacr | before we access any data 170 171 .long 0x4e7b0004 | movc d0,itt0 172 .long 0x4e7b0005 | movc d0,itt1 173 .long 0x4e7b0006 | movc d0,dtt0 174 .long 0x4e7b0007 | movc d0,dtt1 175 .word 0xf4d8 | cinva bc 176 177 /* 178 * 68040 models 179 */ 180 181 lea _C_LABEL(mmuid),a0 182 movl MMUCMD,d0 | get MMU ID 183 lsrl #MMUID_SHIFT,d0 184 andl #MMUID_MASK,d0 185 movl d0,a0@ | save it 186 lea _C_LABEL(machineid),a0 187 cmpb #MMUID_425_T,d0 | are we a 425t? 188 jeq isa425 189 cmpb #MMUID_425_S,d0 | how about 425s? 190 jeq isa425 191 cmpb #MMUID_425_E,d0 | or maybe a 425e? 192 jeq isa425 193 cmpb #MMUID_433_T,d0 | or a 433t? 194 jeq isa433 195 cmpb #MMUID_433_S,d0 | or a 433s? 196 jeq isa433 197 cmpb #MMUID_385,d0 | or a 385? 198 jeq isa385 199 movl #HP_380,a0@ | guess we are a 380 200 jra ihpibcheck 201 isa425: 202 movl #HP_425,a0@ 203 jra ihpibcheck 204 isa433: 205 movl #HP_433,a0@ 206 jra ihpibcheck 207 isa385: 208 movl #HP_385,a0@ 209 jra ihpibcheck 210 211 /* 212 * End 68040 section 213 */ 214 215 /* 216 * 68020 models 217 */ 218 219 is68020: 220 movl #HP_330,a0@ | consider a 330 for now 221 movl #1,MMUCMD | a 68020, write HP MMU location 222 movl MMUCMD,d0 | read it back 223 btst #0,d0 | zero? 224 jeq ihpibcheck | yes, a 330 225 movl #HP_320,a0@ | no, consider a 320 for now 226 movl #0x80,MMUCMD | set magic cookie 227 movl MMUCMD,d0 | read it back 228 btst #7,d0 | cookie still on? 229 jeq ihpibcheck | no, just a 320 230 movl #HP_350,a0@ | yes, a 350 231 232 /* 233 * End 68020 section 234 */ 235 236 ihpibcheck: 237 movl #0,MMUCMD | make sure MMU is off 238 btst #5,SYSFLAG | do we have an internal HP-IB? 239 jeq boottype | yes, continue 240 clrl _C_LABEL(internalhpib) | no, clear the internal address 241 /* 242 * If this is a reboot, extract howto/bootdev stored by kernel 243 */ 244 boottype: 245 cmpw #12,BOOTTYPE | is this a reboot (REQ_REBOOT)? 246 jne notreboot | no, skip 247 lea MAXADDR,a0 | find last page 248 movl a0@+,d7 | and extract howto, bootdev 249 movl a0@+,d6 | from where doboot() left them 250 jra boot1 251 /* 252 * At this point we do not know which logical device the MSUS select 253 * code refers to so we cannot construct bootdev. So we just punt 254 * and let configure() construct it. 255 */ 256 notreboot: 257 moveq #0,d6 | make sure bootdev is invalid 258 cmpw #18,BOOTTYPE | does the user want to interact? 259 jeq askme | yes, go to it 260 moveq #0,d7 | default to RB_AUTOBOOT 261 jra boot1 262 askme: 263 moveq #3,d7 | default to RB_SINGLE|RB_ASKNAME 264 boot1: 265 movl d6,_C_LABEL(bootdev) | save bootdev and howto 266 movl d7,_C_LABEL(howto) | globally so all can access 267 movl LOWRAM,d0 | read lowram value from bootrom 268 /* 269 * Must preserve the scratch area for the BOOT ROM. 270 * Round up to the next 8k boundary. 271 */ 272 addl #((2*NBPG)-1),d0 273 andl #-(2*NBPG),d0 274 movl d0,_C_LABEL(lowram) | stash that value 275 start: 276 movl #_C_LABEL(edata),a2 | start of BSS 277 movl #_C_LABEL(end),a3 | end 278 1: 279 clrb a2@+ | clear BSS 280 cmpl a2,a3 | done? 281 bne 1b | no, keep going 282 jsr _C_LABEL(configure) | configure critical devices 283 jsr _C_LABEL(main) | lets go 284 GLOBAL(_rtt) 285 movl #3,_C_LABEL(howto) | restarts get RB_SINGLE|RB_ASKNAME 286 jmp start 287 288 /* 289 * probe a location and see if it causes a bus error 290 */ 291 ENTRY_NOPROFILE(badaddr) 292 movl BUSERR,_C_LABEL(_bsave) | save ROM bus error handler address 293 movl sp,_C_LABEL(_ssave) | and current stack pointer 294 movl #catchbad,BUSERR | plug in our handler 295 movl sp@(4),a0 | address to probe 296 movw a0@,d1 | do it 297 movl _C_LABEL(_bsave),BUSERR | if we got here, it did not fault 298 clrl d0 | return that this was not a bad addr 299 rts 300 301 catchbad: 302 movl _C_LABEL(_bsave),BUSERR | got a bus error, so restore 303 | old handler 304 movl _C_LABEL(_ssave),sp | manually restore stack 305 moveq #1,d0 | indicate that we got a fault 306 rts | return to caller of badaddr() 307 308 .data 309 GLOBAL(_bsave) 310 .long 0 311 312 GLOBAL(_ssave) 313 .long 0 314 315 ASENTRY_NOPROFILE(__trap) 316 moveml #0xFFFF,sp@- | save registers 317 movl sp,sp@- | push pointer to frame 318 jsr _C_LABEL(trap) | call C routine to deal with it 319 tstl d0 320 jeq Lstop 321 addql #4,sp 322 moveml sp@+,#0x7FFF 323 addql #8,sp 324 rte 325 Lstop: 326 stop #0x2700 | stop cold 327 328 #ifdef ITECONSOLE 329 ASENTRY_NOPROFILE(nmi) 330 movw #18,BOOTTYPE | mark as system switch 331 jsr _C_LABEL(kbdnmi) | clear the interrupt, and 332 | reset the system 333 stop #0 | SCREEEECH! 334 #endif 335 336 ENTRY_NOPROFILE(call_req_reboot) 337 jmp 0x1A4 | call ROM reboot function 338 rts | XXX: just in case? 339 340 ENTRY_NOPROFILE(romout) 341 movl sp@(4),d0 | line number 342 movl sp@(8),a0 | string 343 jsr 0x150 | do it 344 rts 345
Indexes created Tue Sep 30 20:09:53 GMT 2025