/* $NetBSD: srt0.S,v 1.17 2011/02/08 20:20:14 rmind 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 <machine/hp300spu.h> /* For _C_LABEL() and friends. */ #include <machine/asm.h> 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 */ #ifdef ITECONSOLE movl #NMIRESET,%a0 /* NMI keyboard reset addr */ movl #nmi,%a0@ /* catch in reset routine */ #else /* * Built without ITE console support; leave the ROM's NMI * vector in place, so the system will still reset if a * keyboard NMI is issued. */ #endif /* * 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 */ /* * 68030 models */ movl #0x808,%d0 movc %d0,%cacr /* clear data freeze bit again */ movl #0x80,MMUCMD /* set magic cookie */ movl MMUCMD,%d0 /* read it back */ btst #7,%d0 /* cookie still on? */ jeq not370 /* no, 360, 362 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 isa36x /* no, a 360 or a 362 */ lea _C_LABEL(mmuid),%a0 lsrl #MMUID_SHIFT,%d0 /* save MMU ID */ andl #MMUID_MASK,%d0 movl %d0,%a0@ lea _C_LABEL(machineid),%a0 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 isa36x: movl #0x01000000,%sp@- /* check DIOII_BASE (scode 132) */ jbsr _C_LABEL(badaddr) addql #4,%sp tstl %d0 jne ihpibcheck /* no device, assume 360 */ movl #0x01000000,%a0 movb %a0@(0x01),%d0 /* check device ID at DIO_IDOFF */ cmpb #0x39,%d0 /* framebuffer? */ jne ihpibcheck /* no, assume 360 */ movb %a0@(0x15),%d0 /* check sec ID at DIO_SECIDOFF */ cmpb #0x11,%d0 /* VRX sti on 362? */ jne ihpibcheck /* no, assume 360 */ lea _C_LABEL(machineid),%a0 movl #HP_362,%a0@ 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 */ /* * 68040 models */ 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 */ lea _C_LABEL(mmuid),%a0 movl MMUCMD,%d0 /* get MMU ID */ lsrl #MMUID_SHIFT,%d0 andl #MMUID_MASK,%d0 movl %d0,%a0@ /* save it */ lea _C_LABEL(machineid),%a0 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 /* or a 433s? */ jeq isa433 cmpb #MMUID_385,%d0 /* or a 385? */ jeq isa385 cmpb #MMUID_382,%d0 /* or a 382? */ jeq isa382 movl #HP_380,%a0@ /* guess we are 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 isa382: movl #HP_382,%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 */ #ifdef ITECONSOLE ASENTRY_NOPROFILE(nmi) movw #18,BOOTTYPE /* mark as system switch */ jsr _C_LABEL(kbdnmi) /* clear the interrupt, and */ /* reset the system */ stop #0 /* SCREEEECH! */ #endif 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 /* * _transfer(entry, howto, opendev, conscode, lowram, esym) * * Transfer control to the kernel. We also set up registers * as older kernels expect. */ ENTRY_NOPROFILE(_transfer) movl %sp@(8),%d7 /* howto */ movl %sp@(12),%d6 /* opendev (compat) */ movl %sp@(16),%d5 /* conscode (compat) */ movl %sp@(20),%a5 /* lowram */ movl %sp@(24),%a4 /* esym (compat) */ movl %sp@(4),%a0 /* load entry point */ jbsr %a0@ /* GO! */
