srt0.S revision 1.5
1 /* $NetBSD: srt0.S,v 1.5 1999/02/08 10:45:11 he 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 .text 81 ASENTRY_NOPROFILE(begin) 82 movl #STACK,sp 83 moveq #47,d0 | # of vectors - 1 84 movl #VECTORS+2,a0 | addr part of first vector 85 1: 86 movl #_ASM_LABEL(__trap),a0@ | make it direct to __trap 87 addql #6,a0 | move to next vector addr 88 dbf d0,1b | go til done 89 movl #NMIRESET,a0 | NMI keyboard reset addr 90 movl #nmi,a0@ | catch in reset routine 91 92 /* 93 * Determine our SPU type and look for internal HP-IB 94 */ 95 lea _C_LABEL(machineid),a0 96 movl #0x808,d0 97 movc d0,cacr | clear and disable on-chip cache(s) 98 movl #0x200,d0 | data freeze bit 99 movc d0,cacr | only exists on 68030 100 movc cacr,d0 | read it back 101 tstl d0 | zero? 102 jeq not68030 | yes, we have 68020/68040 103 104 movl #0x808,d0 105 movc d0,cacr | clear data freeze bit again 106 107 /* 108 * 68030 models 109 */ 110 111 movl #0x80,MMUCMD | set magic cookie 112 movl MMUCMD,d0 | read it back 113 btst #7,d0 | cookie still on? 114 jeq not370 | no, 360 or 375 115 movl #HP_370,a0@ | consider a 370 for now 116 movl #0,MMUCMD | clear magic cookie 117 movl MMUCMD,d0 | read it back 118 btst #7,d0 | still on? 119 jeq ihpibcheck | no, a 370 120 movl #HP_340,a0@ | yes, must be a 340 121 jra ihpibcheck 122 123 not370: 124 movl #HP_360,a0@ | type is at least a 360 125 movl #0,MMUCMD | clear magic cookie2 126 movl MMUCMD,d0 | read it back 127 btst #16,d0 | still on? 128 jeq ihpibcheck | no, a 360 129 lsrl #MMUID_SHIFT,d0 | save MMU ID 130 andl #MMUID_MASK,d0 131 cmpb #MMUID_345,d0 | are we a 345? 132 jeq isa345 133 cmpb #MMUID_375,d0 | how about a 375? 134 jeq isa375 135 movl #HP_400,a0@ | must be a 400 136 jra ihpibcheck 137 isa345: 138 movl #HP_345,a0@ 139 jra ihpibcheck 140 isa375: 141 movl #HP_375,a0@ 142 jra ihpibcheck 143 144 /* 145 * End of 68030 section 146 */ 147 148 not68030: 149 bset #31,d0 | data cache enable bit 150 movc d0,cacr | only exists on 68040 151 movc cacr,d0 | read it back 152 tstl d0 | zero? 153 beq is68020 | yes, we have 68020 154 moveq #0,d0 | now turn it back off 155 movec d0,cacr | before we access any data 156 157 .long 0x4e7b0004 | movc d0,itt0 158 .long 0x4e7b0005 | movc d0,itt1 159 .long 0x4e7b0006 | movc d0,dtt0 160 .long 0x4e7b0007 | movc d0,dtt1 161 .word 0xf4d8 | cinva bc 162 163 /* 164 * 68040 models 165 */ 166 167 movl MMUCMD,d0 | get MMU ID 168 lsrl #MMUID_SHIFT,d0 169 andl #MMUID_MASK,d0 170 cmpb #MMUID_425_T,d0 | are we a 425t? 171 jeq isa425 172 cmpb #MMUID_425_S,d0 | how about 425s? 173 jeq isa425 174 cmpb #MMUID_433_T,d0 | or a 433t? 175 jeq isa433 176 cmpb #MMUID_433_S,d0 | last chance... 177 jeq isa433 178 movl #HP_380,a0@ | guess we are a 380 179 jra ihpibcheck 180 isa425: 181 movl #HP_425,a0@ 182 jra ihpibcheck 183 isa433: 184 movl #HP_433,a0@ 185 jra ihpibcheck 186 187 /* 188 * End 68040 section 189 */ 190 191 /* 192 * 68020 models 193 */ 194 195 is68020: 196 movl #HP_330,a0@ | consider a 330 for now 197 movl #1,MMUCMD | a 68020, write HP MMU location 198 movl MMUCMD,d0 | read it back 199 btst #0,d0 | zero? 200 jeq ihpibcheck | yes, a 330 201 movl #HP_320,a0@ | no, consider a 320 for now 202 movl #0x80,MMUCMD | set magic cookie 203 movl MMUCMD,d0 | read it back 204 btst #7,d0 | cookie still on? 205 jeq ihpibcheck | no, just a 320 206 movl #HP_350,a0@ | yes, a 350 207 208 /* 209 * End 68020 section 210 */ 211 212 ihpibcheck: 213 movl #0,MMUCMD | make sure MMU is off 214 btst #5,SYSFLAG | do we have an internal HP-IB? 215 jeq boottype | yes, continue 216 clrl _C_LABEL(internalhpib) | no, clear the internal address 217 /* 218 * If this is a reboot, extract howto/bootdev stored by kernel 219 */ 220 boottype: 221 cmpw #12,BOOTTYPE | is this a reboot (REQ_REBOOT)? 222 jne notreboot | no, skip 223 lea MAXADDR,a0 | find last page 224 movl a0@+,d7 | and extract howto, bootdev 225 movl a0@+,d6 | from where doboot() left them 226 jra boot1 227 /* 228 * At this point we do not know which logical device the MSUS select 229 * code refers to so we cannot construct bootdev. So we just punt 230 * and let configure() construct it. 231 */ 232 notreboot: 233 moveq #0,d6 | make sure bootdev is invalid 234 cmpw #18,BOOTTYPE | does the user want to interact? 235 jeq askme | yes, go to it 236 moveq #0,d7 | default to RB_AUTOBOOT 237 jra boot1 238 askme: 239 moveq #3,d7 | default to RB_SINGLE|RB_ASKNAME 240 boot1: 241 movl d6,_C_LABEL(bootdev) | save bootdev and howto 242 movl d7,_C_LABEL(howto) | globally so all can access 243 movl LOWRAM,d0 | read lowram value from bootrom 244 /* 245 * Must preserve the scratch area for the BOOT ROM. 246 * Round up to the next 8k boundary. 247 */ 248 addl #((2*NBPG)-1),d0 249 andl #-(2*NBPG),d0 250 movl d0,_C_LABEL(lowram) | stash that value 251 start: 252 movl #_C_LABEL(edata),a2 | start of BSS 253 movl #_C_LABEL(end),a3 | end 254 1: 255 clrb a2@+ | clear BSS 256 cmpl a2,a3 | done? 257 bne 1b | no, keep going 258 jsr _C_LABEL(configure) | configure critical devices 259 jsr _C_LABEL(main) | lets go 260 GLOBAL(_rtt) 261 movl #3,_C_LABEL(howto) | restarts get RB_SINGLE|RB_ASKNAME 262 jmp start 263 264 /* 265 * probe a location and see if it causes a bus error 266 */ 267 ENTRY_NOPROFILE(badaddr) 268 movl BUSERR,_C_LABEL(_bsave) | save ROM bus error handler address 269 movl sp,_C_LABEL(_ssave) | and current stack pointer 270 movl #catchbad,BUSERR | plug in our handler 271 movl sp@(4),a0 | address to probe 272 movw a0@,d1 | do it 273 movl _C_LABEL(_bsave),BUSERR | if we got here, it did not fault 274 clrl d0 | return that this was not a bad addr 275 rts 276 277 catchbad: 278 movl _C_LABEL(_bsave),BUSERR | got a bus error, so restore 279 | old handler 280 movl _C_LABEL(_ssave),sp | manually restore stack 281 moveq #1,d0 | indicate that we got a fault 282 rts | return to caller of badaddr() 283 284 .data 285 GLOBAL(_bsave) 286 .long 0 287 288 GLOBAL(_ssave) 289 .long 0 290 291 ASENTRY_NOPROFILE(__trap) 292 moveml #0xFFFF,sp@- | save registers 293 movl sp,sp@- | push pointer to frame 294 jsr _C_LABEL(trap) | call C routine to deal with it 295 tstl d0 296 jeq Lstop 297 addql #4,sp 298 moveml sp@+,#0x7FFF 299 addql #8,sp 300 rte 301 Lstop: 302 stop #0x2700 | stop cold 303 304 ASENTRY_NOPROFILE(nmi) 305 movw #18,BOOTTYPE | mark as system switch 306 jsr _C_LABEL(kbdnmi) | clear the interrupt, and 307 | reset the system 308 stop #0 | SCREEEECH! 309 310 ENTRY_NOPROFILE(call_req_reboot) 311 jmp 0x1A4 | call ROM reboot function 312 rts | XXX: just in case? 313 314 ENTRY_NOPROFILE(romout) 315 movl sp@(4),d0 | line number 316 movl sp@(8),a0 | string 317 jsr 0x150 | do it 318 rts 319
Indexes created Wed Oct 01 07:09:59 GMT 2025