machdep.c revision 1.11 
1/*	$NetBSD: machdep.c,v 1.11 2000/09/24 12:32:36 jdolecek Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1992, 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, The Mach Operating System project at
11 * Carnegie-Mellon University and Ralph Campbell.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgement:
23 *	This product includes software developed by the University of
24 *	California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *	@(#)machdep.c	8.3 (Berkeley) 1/12/94
42 */
43
44#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
45
46__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.11 2000/09/24 12:32:36 jdolecek Exp $");
47
48/* from: Utah Hdr: machdep.c 1.63 91/04/24 */
49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/signalvar.h>
53#include <sys/kernel.h>
54#include <sys/map.h>
55#include <sys/proc.h>
56#include <sys/buf.h>
57#include <sys/reboot.h>
58#include <sys/conf.h>
59#include <sys/file.h>
60#include <sys/callout.h>
61#include <sys/malloc.h>
62#include <sys/mbuf.h>
63#include <sys/msgbuf.h>
64#include <sys/ioctl.h>
65#include <sys/device.h>
66#include <sys/user.h>
67#include <sys/exec.h>
68#include <sys/sysctl.h>
69#include <sys/mount.h>
70#include <sys/syscallargs.h>
71#include <sys/kcore.h>
72
73#include <uvm/uvm_extern.h>
74
75#include <ufs/mfs/mfs_extern.h>		/* mfs_initminiroot() */
76
77#include <machine/cpu.h>
78#include <machine/reg.h>
79#include <machine/psl.h>
80#include <machine/pte.h>
81
82#ifdef DDB
83#include <machine/db_machdep.h>
84#include <ddb/db_extern.h>
85#endif
86
87#include <machine/intr.h>
88#include <machine/mainboard.h>
89#include <machine/sysconf.h>
90#include <machine/autoconf.h>
91#include <machine/bootinfo.h>
92#include <machine/prom.h>
93#include <dev/clock_subr.h>
94#include <dev/cons.h>
95
96#include <sys/boot_flag.h>
97
98#include "fs_mfs.h"
99#include "opt_ddb.h"
100#include "opt_execfmt.h"
101
102/* the following is used externally (sysctl_hw) */
103char  machine[] = MACHINE;	/* from <machine/param.h> */
104char  machine_arch[] = MACHINE_ARCH;
105char  cpu_model[40];
106unsigned ssir;
107
108/* Our exported CPU info; we can have only one. */
109struct cpu_info cpu_info_store;
110
111/* maps for VM objects */
112
113vm_map_t exec_map = NULL;
114vm_map_t mb_map = NULL;
115vm_map_t phys_map = NULL;
116
117int		physmem;		/* max supported memory, changes to actual */
118char		*bootinfo = NULL;	/* pointer to bootinfo structure */
119
120phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
121int mem_cluster_cnt;
122
123void to_monitor __P((int)) __attribute__((__noreturn__));
124void prom_halt __P((int)) __attribute__((__noreturn__));
125
126struct evcnt soft_evcnt[IPL_NSOFT];
127
128/*
129 *  Local functions.
130 */
131int initcpu __P((void));
132void configure __P((void));
133
134void mach_init __P((int, char *[], char*[], u_int, char *));
135void softintr_init __P((void));
136int  memsize_scan __P((caddr_t));
137
138#ifdef DEBUG
139/* stacktrace code violates prototypes to get callee's registers */
140extern void stacktrace __P((void)); /*XXX*/
141#endif
142
143/*
144 * safepri is a safe priority for sleep to set for a spin-wait
145 * during autoconfiguration or after a panic.  Used as an argument to splx().
146 * XXX disables interrupt 5 to disable mips3 on-chip clock, which also
147 * disables mips1 FPU interrupts.
148 */
149int	safepri = MIPS3_PSL_LOWIPL;	/* XXX */
150extern struct user *proc0paddr;
151
152/* locore callback-vector setup */
153extern void mips_vector_init  __P((void));
154extern void prom_init  __P((void));
155extern void pizazz_init __P((void));
156
157/* platform-specific initialization vector */
158static void	unimpl_cons_init __P((void));
159static void	unimpl_iointr __P((unsigned, unsigned, unsigned, unsigned));
160static int	unimpl_memsize __P((caddr_t));
161static unsigned	unimpl_clkread __P((void));
162static void	unimpl_todr __P((struct clock_ymdhms *));
163static void	unimpl_intr_establish __P((int, int (*)__P((void *)), void *));
164
165struct platform platform = {
166	"iobus not set",
167	unimpl_cons_init,
168	unimpl_iointr,
169	unimpl_memsize,
170	unimpl_clkread,
171	unimpl_todr,
172	unimpl_todr,
173	unimpl_intr_establish,
174};
175
176struct consdev *cn_tab = NULL;
177extern struct consdev consdev_prom;
178extern struct consdev consdev_zs;
179
180static void null_cnprobe __P((struct consdev *));
181static void prom_cninit __P((struct consdev *));
182static int  prom_cngetc __P((dev_t));
183static void prom_cnputc __P((dev_t, int));
184static void null_cnpollc __P((dev_t, int));
185
186struct consdev consdev_prom = {
187        null_cnprobe,
188	prom_cninit,
189	prom_cngetc,
190	prom_cnputc,
191        null_cnpollc,
192};
193
194
195/*
196 * Do all the stuff that locore normally does before calling main().
197 * Process arguments passed to us by the prom monitor.
198 * Return the first page address following the system.
199 */
200void
201mach_init(argc, argv, envp, bim, bip)
202	int    argc;
203	char   *argv[];
204	char   *envp[];
205	u_int  bim;
206	char   *bip;
207{
208	u_long first, last;
209	caddr_t kernend, v;
210	vsize_t size;
211	char *cp;
212	int i, howto;
213	extern char edata[], end[];
214	char *bi_msg;
215#ifdef DDB
216	int nsym = 0;
217	caddr_t ssym = 0;
218	caddr_t esym = 0;
219	struct btinfo_symtab *bi_syms;
220#endif
221
222
223	/* Check for valid bootinfo passed from bootstrap */
224	if (bim == BOOTINFO_MAGIC) {
225		struct btinfo_magic *bi_magic;
226
227		bootinfo = (char *)BOOTINFO_ADDR; /* XXX */
228		bi_magic = lookup_bootinfo(BTINFO_MAGIC);
229		if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
230			bi_msg = "invalid bootinfo structure.\n";
231		else
232			bi_msg = NULL;
233	} else
234		bi_msg = "invalid bootinfo (standalone boot?)\n";
235
236	/* clear the BSS segment */
237	kernend = (caddr_t)mips_round_page(end);
238	bzero(edata, kernend - edata);
239
240#ifdef DDB
241	bi_syms = lookup_bootinfo(BTINFO_SYMTAB);
242
243	/* Load sysmbol table if present */
244	if (bi_syms != NULL) {
245		nsym = bi_syms->nsym;
246		ssym = (caddr_t)bi_syms->ssym;
247		esym = (caddr_t)bi_syms->esym;
248		kernend = (caddr_t)mips_round_page(esym);
249	}
250#endif
251
252	prom_init();
253	consinit();
254
255	if (bi_msg != NULL)
256		printf(bi_msg);
257
258	/*
259	 * Set the VM page size.
260	 */
261	uvm_setpagesize();
262
263	/* Find out how much memory is available. */
264	physmem = memsize_scan(kernend);
265
266	/*
267	 * Now that we know how much memory we have, initialize the
268	 * mem cluster array.
269	 */
270	mem_clusters[0].start = 0;		/* XXX is this correct? */
271	mem_clusters[0].size  = ctob(physmem);
272	mem_cluster_cnt = 1;
273
274	/*
275	 * Copy exception-dispatch code down to exception vector.
276	 * Initialize locore-function vector.
277	 * Clear out the I and D caches.
278	 */
279	mips_vector_init();
280
281	/* Look at argv[0] and compute bootdev */
282	makebootdev(argv[0]);
283
284	/*
285	 * Look at arguments passed to us and compute boothowto.
286	 */
287	boothowto = RB_SINGLE;
288	for (i = 1; i < argc; i++) {
289		for (cp = argv[i]; *cp; cp++) {
290			/* Ignore superfluous '-', if there is one */
291			if (*cp == '-')
292				continue;
293
294			howto = 0;
295			BOOT_FLAG(*cp, howto);
296			if (! howto)
297				printf("bootflag '%c' not recognised\n", *cp);
298			else
299				boothowto |= howto;
300		}
301	}
302
303
304#ifdef DDB
305	/*
306	 * Initialize machine-dependent DDB commands, in case of early panic.
307	 */
308	db_machine_init();
309	/* init symbols if present */
310	if (esym)
311		ddb_init(esym - ssym, ssym, esym);
312	if (boothowto & RB_KDB)
313		Debugger();
314#endif
315
316#ifdef MFS
317	/*
318	 * Check to see if a mini-root was loaded into memory. It resides
319	 * at the start of the next page just after the end of BSS.
320	 */
321	if (boothowto & RB_MINIROOT)
322		kernend += round_page(mfs_initminiroot(kernend));
323#endif
324
325	/*
326	 * Alloc u pages for proc0 stealing KSEG0 memory.
327	 */
328	proc0.p_addr = proc0paddr = (struct user *)kernend;
329	proc0.p_md.md_regs = (struct frame *)(kernend + USPACE) - 1;
330	memset(proc0.p_addr, 0, USPACE);
331	curpcb = &proc0.p_addr->u_pcb;
332	curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */
333
334	kernend += USPACE;
335
336	/*
337	 * Load the rest of the available pages into the VM system.
338	 */
339	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
340	last = mem_clusters[0].start + mem_clusters[0].size;
341	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
342	    VM_FREELIST_DEFAULT);
343
344	/*
345	 * Initialize error message buffer (at end of core).
346	 */
347	mips_init_msgbuf();
348
349	/*
350	 * Allocate space for system data structures.  These data structures
351	 * are allocated here instead of cpu_startup() because physical
352	 * memory is directly addressable.  We don't have to map these into
353	 * virtual address space.
354	 */
355	size = (vsize_t)allocsys(NULL, NULL);
356	v = (caddr_t)pmap_steal_memory(size, NULL, NULL);
357	if ((allocsys(v, NULL) - v) != size)
358		panic("mach_init: table size inconsistency");
359	/*
360	 * Set up interrupt handling and I/O addresses.
361	 */
362
363	pizazz_init();
364
365	/*
366	 * Initialize the virtual memory system.
367	 */
368	pmap_bootstrap();
369}
370
371
372
373/*
374 * cpu_startup: allocate memory for variable-sized tables,
375 * initialize cpu, and do autoconfiguration.
376 */
377void
378cpu_startup()
379{
380	register unsigned i;
381	int base, residual;
382	vaddr_t minaddr, maxaddr;
383	vsize_t size;
384	char pbuf[9];
385#ifdef DEBUG
386	extern int pmapdebug;
387	int opmapdebug = pmapdebug;
388
389	pmapdebug = 0;
390#endif
391
392	/*
393	 * Good {morning,afternoon,evening,night}.
394	 */
395	printf(version);
396	printf("%s\n", cpu_model);
397	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
398	printf("total memory = %s\n", pbuf);
399
400	/*
401	 * Allocate virtual address space for file I/O buffers.
402	 * Note they are different than the array of headers, 'buf',
403	 * and usually occupy more virtual memory than physical.
404	 */
405	size = MAXBSIZE * nbuf;
406	if (uvm_map(kernel_map, (vaddr_t *)&buffers, round_page(size),
407		    NULL, UVM_UNKNOWN_OFFSET, 0,
408		    UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
409				UVM_ADV_NORMAL, 0)) != KERN_SUCCESS)
410		panic("startup: cannot allocate VM for buffers");
411	minaddr = (vaddr_t)buffers;
412	base = bufpages / nbuf;
413	residual = bufpages % nbuf;
414	for (i = 0; i < nbuf; i++) {
415		vsize_t curbufsize;
416		vaddr_t curbuf;
417		struct vm_page *pg;
418
419		/*
420		 * Each buffer has MAXBSIZE bytes of VM space allocated.  Of
421		 * that MAXBSIZE space, we allocate and map (base+1) pages
422		 * for the first "residual" buffers, and then we allocate
423		 * "base" pages for the rest.
424		 */
425		curbuf = (vaddr_t) buffers + (i * MAXBSIZE);
426		curbufsize = NBPG * ((i < residual) ? (base+1) : base);
427
428		while (curbufsize) {
429			pg = uvm_pagealloc(NULL, 0, NULL, 0);
430			if (pg == NULL)
431				panic("cpu_startup: not enough memory for "
432				    "buffer cache");
433			pmap_kenter_pa(curbuf, VM_PAGE_TO_PHYS(pg),
434				       VM_PROT_READ|VM_PROT_WRITE);
435			curbuf += PAGE_SIZE;
436			curbufsize -= PAGE_SIZE;
437		}
438	}
439	/*
440	 * Allocate a submap for exec arguments.  This map effectively
441	 * limits the number of processes exec'ing at any time.
442	 */
443	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
444				   16 * NCARGS, TRUE, FALSE, NULL);
445	/*
446	 * Allocate a submap for physio
447	 */
448	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
449				   VM_PHYS_SIZE, TRUE, FALSE, NULL);
450
451	/*
452	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
453	 * are allocated via the pool allocator, and we use KSEG to
454	 * map those pages.
455	 */
456
457#ifdef DEBUG
458	pmapdebug = opmapdebug;
459#endif
460	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
461	printf("avail memory = %s\n", pbuf);
462	format_bytes(pbuf, sizeof(pbuf), bufpages * NBPG);
463	printf("using %d buffers containing %s of memory\n", nbuf, pbuf);
464
465	/*
466	 * Set up buffers, so they can be used to read disk labels.
467	 */
468	bufinit();
469}
470
471void
472softintr_init()
473{
474    int i;
475    static const char *intr_names[] = IPL_SOFTNAMES;
476
477    for (i=0; i < IPL_NSOFT; i++) {
478	    evcnt_attach_dynamic(&soft_evcnt[i], EVCNT_TYPE_INTR, NULL,
479				 "soft", intr_names[i]);
480    }
481}
482
483/*
484 * machine dependent system variables.
485 */
486int
487cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
488	int *name;
489	u_int namelen;
490	void *oldp;
491	size_t *oldlenp;
492	void *newp;
493	size_t newlen;
494	struct proc *p;
495{
496	/* all sysctl names at this level are terminal */
497	if (namelen != 1)
498		return (ENOTDIR);		/* overloaded */
499
500	switch (name[0]) {
501	default:
502		return (EOPNOTSUPP);
503	}
504	/* NOTREACHED */
505}
506
507/*
508 * Look up information in bootinfo of boot loader.
509 */
510void *
511lookup_bootinfo(type)
512	int type;
513{
514	struct btinfo_common *bt;
515	char *help = bootinfo;
516
517	/* Check for a bootinfo record first. */
518	if (help == NULL)
519		return (NULL);
520
521	do {
522		bt = (struct btinfo_common *)help;
523		if (bt->type == type)
524			return ((void *)help);
525		help += bt->next;
526	} while (bt->next != 0 &&
527		(size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);
528
529	return (NULL);
530}
531
532int	waittime = -1;
533
534/*
535 * call PROM to halt or reboot.
536 */
537void
538prom_halt(howto)
539	int howto;
540{
541	if (howto & RB_HALT)
542		MIPS_PROM(reinit)();
543	MIPS_PROM(reboot)();
544	/* NOTREACHED */
545}
546
547void
548cpu_reboot(howto, bootstr)
549	volatile int howto;
550	char *bootstr;
551{
552	extern int cold;
553
554	/* take a snap shot before clobbering any registers */
555	if (curproc)
556		savectx((struct user *)curpcb);
557
558#ifdef DEBUG
559	if (panicstr)
560		stacktrace();
561#endif
562
563	/* If system is cold, just halt. */
564	if (cold) {
565		howto |= RB_HALT;
566		goto haltsys;
567	}
568
569	/* If "always halt" was specified as a boot flag, obey. */
570	if ((boothowto & RB_HALT) != 0)
571		howto |= RB_HALT;
572
573	boothowto = howto;
574	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
575		/*
576		 * Synchronize the disks....
577		 */
578		waittime = 0;
579		vfs_shutdown();
580
581		/*
582		 * If we've been adjusting the clock, the todr
583		 * will be out of synch; adjust it now.
584		 */
585		resettodr();
586	}
587
588	/* Disable interrupts. */
589	splhigh();
590
591	/* If rebooting and a dump is requested do it. */
592#if 0
593	if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
594#else
595	if (howto & RB_DUMP)
596#endif
597		dumpsys();
598
599haltsys:
600
601	/* run any shutdown hooks */
602	doshutdownhooks();
603
604	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
605		prom_halt(0x80);	/* rom monitor RB_PWOFF */
606
607	/* Finally, halt/reboot the system. */
608	printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting...");
609	prom_halt(howto & RB_HALT);
610	/*NOTREACHED*/
611}
612
613/*
614 * Return the best possible estimate of the time in the timeval
615 * to which tvp points.  Unfortunately, we can't read the hardware registers.
616 * We guarantee that the time will be greater than the value obtained by a
617 * previous call.
618 */
619void
620microtime(tvp)
621	register struct timeval *tvp;
622{
623	static struct timeval lasttime;
624	int s = splclock();
625
626	*tvp = time;
627
628	tvp->tv_usec += (*platform.clkread)();
629
630	while (tvp->tv_usec >= 1000000) {
631		tvp->tv_usec -= 1000000;
632		tvp->tv_sec++;
633	}
634
635	if (tvp->tv_sec == lasttime.tv_sec &&
636	    tvp->tv_usec <= lasttime.tv_usec &&
637	    (tvp->tv_usec = lasttime.tv_usec + 1) > 1000000) {
638		tvp->tv_sec++;
639		tvp->tv_usec -= 1000000;
640	}
641	lasttime = *tvp;
642	splx(s);
643}
644
645int
646initcpu()
647{
648        softintr_init();
649	spl0();		/* safe to turn interrupts on now */
650	return 0;
651}
652
653static void
654unimpl_cons_init()
655{
656
657	panic("sysconf.init didn't set cons_init");
658}
659
660static void
661unimpl_iointr(mask, pc, statusreg, causereg)
662	u_int mask;
663	u_int pc;
664	u_int statusreg;
665	u_int causereg;
666{
667
668	panic("sysconf.init didn't set intr");
669}
670
671static int
672unimpl_memsize(first)
673caddr_t first;
674{
675
676	panic("sysconf.init didn't set memsize");
677}
678
679static unsigned
680unimpl_clkread()
681{
682	panic("sysconf.init didn't set clkread");
683}
684
685static void
686unimpl_todr(dt)
687	struct clock_ymdhms *dt;
688{
689	panic("sysconf.init didn't init TOD");
690}
691
692void
693unimpl_intr_establish(level, func, arg)
694	int level;
695	int (*func) __P((void *));
696	void *arg;
697{
698	panic("sysconf.init didn't init intr_establish\n");
699}
700
701void
702delay(n)
703	int n;
704{
705	DELAY(n);
706}
707
708void
709cpu_intr(status, cause, pc, ipending)
710	u_int32_t status;
711	u_int32_t cause;
712	u_int32_t pc;
713	u_int32_t ipending;
714{
715	uvmexp.intrs++;
716
717	/* device interrupts */
718	(*platform.iointr)(status, cause, pc, ipending);
719
720	/* software simulated interrupt */
721	if ((ipending & MIPS_SOFT_INT_MASK_1) ||
722	    (ssir && (status & MIPS_SOFT_INT_MASK_1))) {
723
724#define DO_SIR(bit, fn, ev)			       		\
725	do {							\
726		if (n & (bit)) {				\
727			uvmexp.softs++;				\
728			soft_evcnt[ev].ev_count++;		\
729			fn;					\
730		}						\
731	} while (0)
732
733		unsigned n;
734		n = ssir; ssir = 0;
735		_clrsoftintr(MIPS_SOFT_INT_MASK_1);
736
737#if NZSC > 0
738		DO_SIR(SIR_SERIAL, zssoft(), IPL_SOFTSERIAL);
739#endif
740		DO_SIR(SIR_NET, netintr(), IPL_SOFTNET);
741#undef DO_SIR
742	}
743
744	/* 'softclock' interrupt */
745	if (ipending & MIPS_SOFT_INT_MASK_0) {
746		_clrsoftintr(MIPS_SOFT_INT_MASK_0);
747		uvmexp.softs++;
748		soft_evcnt[IPL_SOFTCLOCK].ev_count++;
749		softclock();
750	}
751}
752
753/*
754 * Find out how much memory is available by testing memory.
755 * Be careful to save and restore the original contents for msgbuf.
756 */
757int
758memsize_scan(first)
759	caddr_t first;
760{
761	volatile int *vp, *vp0;
762	int mem, tmp, tmp0;
763
764#define PATTERN1 0xa5a5a5a5
765#define	PATTERN2 ~PATTERN1
766
767	/*
768	 * Non destructive scan of memory to determine the size
769	 * Use the first page to test for memory aliases.  This
770	 * also has the side effect of flushing the bus alignment
771	 * buffer
772	 */
773	mem = btoc((paddr_t)first - MIPS_KSEG0_START);
774	vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
775	vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
776	tmp0 = *vp0;
777	while (vp < (int *)MIPS_MAX_MEM_ADDR) {
778		tmp = *vp;
779		*vp  = PATTERN1;
780		*vp0 = PATTERN2;
781		wbflush();
782		if (*vp != PATTERN1)
783			break;
784		*vp  = PATTERN2;
785		*vp0 = PATTERN1;
786		wbflush();
787		if (*vp != PATTERN2)
788			break;
789		*vp = tmp;
790		vp += NBPG/sizeof(int);
791		mem++;
792	}
793	*vp0 = tmp0;
794	return mem;
795}
796
797
798#ifdef EXEC_ECOFF
799#include <sys/exec_ecoff.h>
800
801int
802cpu_exec_ecoff_hook(p, epp)
803	struct proc *p;
804	struct exec_package *epp;
805{
806	extern struct emul emul_netbsd;
807
808	epp->ep_emul = &emul_netbsd;
809
810	return 0;
811}
812#endif
813
814/*
815 * Console initialization: called early on from main,
816 * before vm init or startup.  Do enough configuration
817 * to choose and initialize a console.
818 */
819
820static void
821null_cnprobe(cn)
822     struct consdev *cn;
823{
824}
825
826static void
827prom_cninit(cn)
828	struct consdev *cn;
829{
830	cn->cn_dev = makedev(0, 0);
831	cn->cn_pri = CN_REMOTE;
832}
833
834static int
835prom_cngetc(dev)
836	dev_t dev;
837{
838	return MIPS_PROM(getchar)();
839}
840
841static void
842prom_cnputc(dev, c)
843	dev_t dev;
844	int c;
845{
846	MIPS_PROM(putchar)(c);
847}
848
849static void
850null_cnpollc(dev, on)
851	dev_t dev;
852	int on;
853{
854}
855
856void
857consinit()
858{
859	int zs_unit;
860
861	zs_unit = 0;
862	cn_tab = &consdev_zs;
863
864	(*cn_tab->cn_init)(cn_tab);
865}
866