/* $OpenBSD: srt0.S,v 1.4 2003/06/02 23:27:46 millert Exp $ */ /* $NetBSD: srt0.S,v 1.4 1997/05/12 07:56:00 thorpej Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: srt0.c 1.18 92/12/21$ * * @(#)srt0.c 8.1 (Berkeley) 6/10/93 */ /* * Startup code for standalone system */ /* For machineid and mmuid constants */ #include /* For _C_LABEL() and friends. */ #include STACK = 0xfffff000 | below the ROM page BOOTTYPE = 0xfffffdc0 LOWRAM = 0xfffffdce SYSFLAG = 0xfffffed2 | system flags MSUS = 0xfffffedc | MSUS (?) structure VECTORS = 0xfffffee0 | beginning of jump vectors NMIRESET = 0xffffff9c | reset vector BUSERR = 0xfffffffc MAXADDR = 0xfffff000 NBPG = 4096 MMUCMD = 0x005f400c | MMU command/status register .data GLOBAL(bootdev) .long 0 GLOBAL(howto) .long 0 GLOBAL(lowram) .long 0 GLOBAL(machineid) .long 0 GLOBAL(mmuid) .long 0 .text ASENTRY_NOPROFILE(begin) movl #STACK,sp moveq #47,d0 | # of vectors - 1 movl #VECTORS+2,a0 | addr part of first vector 1: movl #_ASM_LABEL(__trap),a0@ | make it direct to __trap addql #6,a0 | move to next vector addr dbf d0,1b | go til done movl #NMIRESET,a0 | NMI keyboard reset addr movl #nmi,a0@ | catch in reset routine /* * Determine our SPU type and look for internal HP-IB */ lea _C_LABEL(machineid),a0 movl #0x808,d0 movc d0,cacr | clear and disable on-chip cache(s) movl #0x200,d0 | data freeze bit movc d0,cacr | only exists on 68030 movc cacr,d0 | read it back tstl d0 | zero? jeq not68030 | yes, we have 68020/68040 movl #0x808,d0 movc d0,cacr | clear data freeze bit again /* * 68030 models */ movl #0x80,MMUCMD | set magic cookie movl MMUCMD,d0 | read it back btst #7,d0 | cookie still on? jeq not370 | no, 360 or 375 movl #HP_370,a0@ | consider a 370 for now movl #0,MMUCMD | clear magic cookie movl MMUCMD,d0 | read it back btst #7,d0 | still on? jeq ihpibcheck | no, a 370 movl #HP_340,a0@ | yes, must be a 340 jra ihpibcheck not370: movl #HP_360,a0@ | type is at least a 360 movl #0,MMUCMD | clear magic cookie2 movl MMUCMD,d0 | read it back btst #16,d0 | still on? jeq ihpibcheck | no, a 360 lsrl #MMUID_SHIFT,d0 | save MMU ID andl #MMUID_MASK,d0 movl d0,_C_LABEL(mmuid) | save mmuid cmpb #MMUID_345,d0 | are we a 345? jeq isa345 cmpb #MMUID_375,d0 | how about a 375? jeq isa375 movl #HP_400,a0@ | must be a 400 jra ihpibcheck isa345: movl #HP_345,a0@ jra ihpibcheck isa375: movl #HP_375,a0@ jra ihpibcheck /* * End of 68030 section */ not68030: bset #31,d0 | data cache enable bit movc d0,cacr | only exists on 68040 movc cacr,d0 | read it back tstl d0 | zero? beq is68020 | yes, we have 68020 moveq #0,d0 | now turn it back off movec d0,cacr | before we access any data .long 0x4e7b0004 | movc d0,itt0 .long 0x4e7b0005 | movc d0,itt1 .long 0x4e7b0006 | movc d0,dtt0 .long 0x4e7b0007 | movc d0,dtt1 .word 0xf4d8 | cinva bc /* * 68040 models */ movl MMUCMD,d0 | get MMU ID lsrl #MMUID_SHIFT,d0 andl #MMUID_MASK,d0 movl d0,_C_LABEL(mmuid) | save mmuid cmpb #MMUID_425_T,d0 | are we a 425t? jeq isa425 cmpb #MMUID_425_S,d0 | how about 425s? jeq isa425 cmpb #MMUID_425_E,d0 | or maybe a 425e? jeq isa425 cmpb #MMUID_433_T,d0 | or a 433t? jeq isa433 cmpb #MMUID_433_S,d0 | maybe a 433s? jeq isa433 cmpb #MMUID_385,d0 | last chance... jeq isa385 movl #HP_380,a0@ | guess we're a 380 jra ihpibcheck isa425: movl #HP_425,a0@ jra ihpibcheck isa433: movl #HP_433,a0@ jra ihpibcheck isa385: movl #HP_385,a0@ jra ihpibcheck /* * End 68040 section */ /* * 68020 models */ is68020: movl #HP_330,a0@ | consider a 330 for now movl #1,MMUCMD | a 68020, write HP MMU location movl MMUCMD,d0 | read it back btst #0,d0 | zero? jeq ihpibcheck | yes, a 330 movl #HP_320,a0@ | no, consider a 320 for now movl #0x80,MMUCMD | set magic cookie movl MMUCMD,d0 | read it back btst #7,d0 | cookie still on? jeq ihpibcheck | no, just a 320 movl #HP_350,a0@ | yes, a 350 /* * End 68020 section */ ihpibcheck: movl #0,MMUCMD | make sure MMU is off btst #5,SYSFLAG | do we have an internal HP-IB? jeq boottype | yes, continue clrl _C_LABEL(internalhpib) | no, clear the internal address /* * If this is a reboot, extract howto/bootdev stored by kernel */ boottype: cmpw #12,BOOTTYPE | is this a reboot (REQ_REBOOT)? jne notreboot | no, skip lea MAXADDR,a0 | find last page movl a0@+,d7 | and extract howto, bootdev movl a0@+,d6 | from where doboot() left them jra boot1 /* * At this point we do not know which logical device the MSUS select * code refers to so we cannot construct bootdev. So we just punt * and let configure() construct it. */ notreboot: moveq #0,d6 | make sure bootdev is invalid cmpw #18,BOOTTYPE | does the user want to interact? jeq askme | yes, go to it moveq #0,d7 | default to RB_AUTOBOOT jra boot1 askme: moveq #3,d7 | default to RB_SINGLE|RB_ASKNAME boot1: movl d6,_C_LABEL(bootdev) | save bootdev and howto movl d7,_C_LABEL(howto) | globally so all can access movl LOWRAM,d0 | read lowram value from bootrom /* * Must preserve the scratch area for the BOOT ROM. * Round up to the next 8k boundary. */ addl #((2*NBPG)-1),d0 andl #-(2*NBPG),d0 movl d0,_C_LABEL(lowram) | stash that value start: movl #_C_LABEL(edata),a2 | start of BSS movl #_C_LABEL(end),a3 | end 1: clrb a2@+ | clear BSS cmpl a2,a3 | done? bne 1b | no, keep going jsr _C_LABEL(configure) | configure critical devices jsr _C_LABEL(main) | lets go GLOBAL(_rtt) movl #3,_C_LABEL(howto) | restarts get RB_SINGLE|RB_ASKNAME jmp start /* * probe a location and see if it causes a bus error */ ENTRY_NOPROFILE(badaddr) movl BUSERR,_C_LABEL(_bsave) | save ROM bus error handler address movl sp,_C_LABEL(_ssave) | and current stack pointer movl #catchbad,BUSERR | plug in our handler movl sp@(4),a0 | address to probe movw a0@,d1 | do it movl _C_LABEL(_bsave),BUSERR | if we got here, it did not fault clrl d0 | return that this was not a bad addr rts catchbad: movl _C_LABEL(_bsave),BUSERR | got a bus error, so restore | old handler movl _C_LABEL(_ssave),sp | manually restore stack moveq #1,d0 | indicate that we got a fault rts | return to caller of badaddr() .data GLOBAL(_bsave) .long 0 GLOBAL(_ssave) .long 0 ASENTRY_NOPROFILE(__trap) moveml #0xFFFF,sp@- | save registers movl sp,sp@- | push pointer to frame jsr _C_LABEL(trap) | call C routine to deal with it tstl d0 jeq Lstop addql #4,sp moveml sp@+,#0x7FFF addql #8,sp rte Lstop: stop #0x2700 | stop cold ASENTRY_NOPROFILE(nmi) movw #18,BOOTTYPE | mark as system switch jsr _C_LABEL(kbdnmi) | clear the interrupt, and | reset the system stop #0 | SCREEEECH! ENTRY_NOPROFILE(call_req_reboot) jmp 0x1A4 | call ROM reboot function rts | XXX: just in case? ENTRY_NOPROFILE(romout) movl sp@(4),d0 | line number movl sp@(8),a0 | string jsr 0x150 | do it rts