machdep.c revision 1.46 
1/*	$NetBSD: machdep.c,v 1.46 2006/04/09 01:18:14 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
9 * Science Department, The Mach Operating System project at
10 * Carnegie-Mellon University and Ralph Campbell.
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. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)machdep.c	8.3 (Berkeley) 1/12/94
37 */
38/*
39 * Copyright (c) 1988 University of Utah.
40 *
41 * This code is derived from software contributed to Berkeley by
42 * the Systems Programming Group of the University of Utah Computer
43 * Science Department, The Mach Operating System project at
44 * Carnegie-Mellon University and Ralph Campbell.
45 *
46 * Redistribution and use in source and binary forms, with or without
47 * modification, are permitted provided that the following conditions
48 * are met:
49 * 1. Redistributions of source code must retain the above copyright
50 *    notice, this list of conditions and the following disclaimer.
51 * 2. Redistributions in binary form must reproduce the above copyright
52 *    notice, this list of conditions and the following disclaimer in the
53 *    documentation and/or other materials provided with the distribution.
54 * 3. All advertising materials mentioning features or use of this software
55 *    must display the following acknowledgement:
56 *	This product includes software developed by the University of
57 *	California, Berkeley and its contributors.
58 * 4. Neither the name of the University nor the names of its contributors
59 *    may be used to endorse or promote products derived from this software
60 *    without specific prior written permission.
61 *
62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
65 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
72 * SUCH DAMAGE.
73 *
74 *	@(#)machdep.c	8.3 (Berkeley) 1/12/94
75 */
76
77#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
78
79__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.46 2006/04/09 01:18:14 tsutsui Exp $");
80
81/* from: Utah Hdr: machdep.c 1.63 91/04/24 */
82
83#include "opt_ddb.h"
84#include "opt_kgdb.h"
85
86#include <sys/param.h>
87#include <sys/signalvar.h>
88#include <sys/kernel.h>
89#include <sys/proc.h>
90#include <sys/buf.h>
91#include <sys/reboot.h>
92#include <sys/conf.h>
93#include <sys/file.h>
94#include <sys/callout.h>
95#include <sys/malloc.h>
96#include <sys/mbuf.h>
97#include <sys/msgbuf.h>
98#include <sys/ioctl.h>
99#include <sys/device.h>
100#include <sys/user.h>
101#include <sys/exec.h>
102#include <sys/mount.h>
103#include <sys/sa.h>
104#include <sys/syscallargs.h>
105#include <sys/kcore.h>
106#include <sys/ksyms.h>
107
108#include <uvm/uvm_extern.h>
109
110#include <ufs/mfs/mfs_extern.h>		/* mfs_initminiroot() */
111
112#include <machine/cpu.h>
113#include <machine/reg.h>
114#include <machine/psl.h>
115#include <machine/pte.h>
116
117#ifdef DDB
118#include <machine/db_machdep.h>
119#include <ddb/db_extern.h>
120#endif
121
122#include <machine/intr.h>
123#include <machine/mainboard.h>
124#include <machine/sysconf.h>
125#include <machine/autoconf.h>
126#include <machine/bootinfo.h>
127#include <machine/prom.h>
128#include <dev/clock_subr.h>
129#include <dev/cons.h>
130
131#include <sys/boot_flag.h>
132
133#include "fs_mfs.h"
134#include "opt_ddb.h"
135#include "opt_execfmt.h"
136
137#include "zsc.h"			/* XXX */
138#include "com.h"			/* XXX */
139#include "ksyms.h"
140
141/* Our exported CPU info; we can have only one. */
142struct cpu_info cpu_info_store;
143
144/* maps for VM objects */
145
146struct vm_map *exec_map = NULL;
147struct vm_map *mb_map = NULL;
148struct vm_map *phys_map = NULL;
149
150int	physmem;		/* max supported memory, changes to actual */
151char	*bootinfo = NULL;	/* pointer to bootinfo structure */
152
153phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
154int mem_cluster_cnt;
155
156void to_monitor __P((int)) __attribute__((__noreturn__));
157void prom_halt __P((int)) __attribute__((__noreturn__));
158
159#ifdef	KGDB
160void zs_kgdb_init __P((void));
161void kgdb_connect __P((int));
162#endif
163
164struct evcnt soft_evcnt[IPL_NSOFT];
165
166/*
167 *  Local functions.
168 */
169int initcpu __P((void));
170void configure __P((void));
171
172void mach_init __P((int, char *[], char*[], u_int, char *));
173int  memsize_scan __P((caddr_t));
174
175#ifdef DEBUG
176/* stacktrace code violates prototypes to get callee's registers */
177extern void stacktrace __P((void)); /*XXX*/
178#endif
179
180/*
181 * safepri is a safe priority for sleep to set for a spin-wait
182 * during autoconfiguration or after a panic.  Used as an argument to splx().
183 * XXX disables interrupt 5 to disable mips3 on-chip clock, which also
184 * disables mips1 FPU interrupts.
185 */
186int	safepri = MIPS3_PSL_LOWIPL;	/* XXX */
187extern struct user *proc0paddr;
188
189/* locore callback-vector setup */
190extern void mips_vector_init  __P((void));
191extern void prom_init  __P((void));
192extern void pizazz_init __P((void));
193
194/* platform-specific initialization vector */
195static void	unimpl_cons_init __P((void));
196static void	unimpl_iointr __P((unsigned, unsigned, unsigned, unsigned));
197static int	unimpl_memsize __P((caddr_t));
198static unsigned	unimpl_clkread __P((void));
199static void	unimpl_todr __P((struct clock_ymdhms *));
200static void	unimpl_intr_establish __P((int, int (*)__P((void *)), void *));
201
202struct platform platform = {
203	"iobus not set",
204	unimpl_cons_init,
205	unimpl_iointr,
206	unimpl_memsize,
207	unimpl_clkread,
208	unimpl_todr,
209	unimpl_todr,
210	unimpl_intr_establish,
211};
212
213struct consdev *cn_tab = NULL;
214extern struct consdev consdev_prom;
215extern struct consdev consdev_zs;
216
217static void null_cnprobe __P((struct consdev *));
218static void prom_cninit __P((struct consdev *));
219static int  prom_cngetc __P((dev_t));
220static void prom_cnputc __P((dev_t, int));
221static void null_cnpollc __P((dev_t, int));
222
223struct consdev consdev_prom = {
224        null_cnprobe,
225	prom_cninit,
226	prom_cngetc,
227	prom_cnputc,
228        null_cnpollc,
229};
230
231
232/*
233 * Do all the stuff that locore normally does before calling main().
234 * Process arguments passed to us by the prom monitor.
235 * Return the first page address following the system.
236 */
237void
238mach_init(argc, argv, envp, bim, bip)
239	int    argc;
240	char   *argv[];
241	char   *envp[];
242	u_int  bim;
243	char   *bip;
244{
245	u_long first, last;
246	caddr_t kernend, v;
247	char *cp;
248	int i, howto;
249	extern char edata[], end[];
250	const char *bi_msg;
251#if NKSYMS || defined(DDB) || defined(LKM)
252	int nsym = 0;
253	caddr_t ssym = 0;
254	caddr_t esym = 0;
255	struct btinfo_symtab *bi_syms;
256#endif
257
258
259	/* Check for valid bootinfo passed from bootstrap */
260	if (bim == BOOTINFO_MAGIC) {
261		struct btinfo_magic *bi_magic;
262
263		bootinfo = (char *)BOOTINFO_ADDR; /* XXX */
264		bi_magic = lookup_bootinfo(BTINFO_MAGIC);
265		if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
266			bi_msg = "invalid bootinfo structure.\n";
267		else
268			bi_msg = NULL;
269	} else
270		bi_msg = "invalid bootinfo (standalone boot?)\n";
271
272	/* clear the BSS segment */
273	kernend = (caddr_t)mips_round_page(end);
274	memset(edata, 0, end - edata);
275
276#if NKSYMS || defined(DDB) || defined(LKM)
277	bi_syms = lookup_bootinfo(BTINFO_SYMTAB);
278
279	/* Load sysmbol table if present */
280	if (bi_syms != NULL) {
281		nsym = bi_syms->nsym;
282		ssym = (caddr_t)bi_syms->ssym;
283		esym = (caddr_t)bi_syms->esym;
284		kernend = (caddr_t)mips_round_page(esym);
285	}
286#endif
287
288	prom_init();
289	consinit();
290
291	if (bi_msg != NULL)
292		printf(bi_msg);
293
294	/*
295	 * Set the VM page size.
296	 */
297	uvm_setpagesize();
298
299	/* Find out how much memory is available. */
300	physmem = memsize_scan(kernend);
301
302	/*
303	 * Now that we know how much memory we have, initialize the
304	 * mem cluster array.
305	 */
306	mem_clusters[0].start = 0;		/* XXX is this correct? */
307	mem_clusters[0].size  = ctob(physmem);
308	mem_cluster_cnt = 1;
309
310	/*
311	 * Copy exception-dispatch code down to exception vector.
312	 * Initialize locore-function vector.
313	 * Clear out the I and D caches.
314	 */
315	mips_vector_init();
316
317	/* Look at argv[0] and compute bootdev */
318	makebootdev(argv[0]);
319
320	/*
321	 * Look at arguments passed to us and compute boothowto.
322	 */
323	boothowto = RB_AUTOBOOT;
324	for (i = 1; i < argc; i++) {
325		for (cp = argv[i]; *cp; cp++) {
326			/* Ignore superfluous '-', if there is one */
327			if (*cp == '-')
328				continue;
329
330			howto = 0;
331			BOOT_FLAG(*cp, howto);
332			if (! howto)
333				printf("bootflag '%c' not recognised\n", *cp);
334			else
335				boothowto |= howto;
336		}
337	}
338
339
340#if NKSYMS || defined(DDB) || defined(LKM)
341	/* init symbols if present */
342	if (esym)
343		ksyms_init(esym - ssym, ssym, esym);
344#endif
345#ifdef DDB
346	if (boothowto & RB_KDB)
347		Debugger();
348#endif
349#ifdef KGDB
350	zs_kgdb_init();			/* XXX */
351	if (boothowto & RB_KDB)
352		kgdb_connect(0);
353#endif
354
355#ifdef MFS
356	/*
357	 * Check to see if a mini-root was loaded into memory. It resides
358	 * at the start of the next page just after the end of BSS.
359	 */
360	if (boothowto & RB_MINIROOT)
361		kernend += round_page(mfs_initminiroot(kernend));
362#endif
363
364	/*
365	 * Load the rest of the available pages into the VM system.
366	 */
367	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
368	last = mem_clusters[0].start + mem_clusters[0].size;
369	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
370	    VM_FREELIST_DEFAULT);
371
372	/*
373	 * Initialize error message buffer (at end of core).
374	 */
375	mips_init_msgbuf();
376
377	/*
378	 * Initialize the virtual memory system.
379	 */
380	pmap_bootstrap();
381
382	/*
383	 * Allocate space for proc0's USPACE.
384	 */
385	v = (caddr_t)uvm_pageboot_alloc(USPACE);
386	lwp0.l_addr = proc0paddr = (struct user *)v;
387	lwp0.l_md.md_regs = (struct frame *)(v + USPACE) - 1;
388	curpcb = &lwp0.l_addr->u_pcb;
389	curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */
390
391	/*
392	 * Set up interrupt handling and I/O addresses.
393	 */
394	pizazz_init();
395}
396
397
398
399/*
400 * cpu_startup: allocate memory for variable-sized tables,
401 * initialize CPU, and do autoconfiguration.
402 */
403void
404cpu_startup()
405{
406	vaddr_t minaddr, maxaddr;
407	char pbuf[9];
408#ifdef DEBUG
409	extern int pmapdebug;
410	int opmapdebug = pmapdebug;
411
412	pmapdebug = 0;
413#endif
414
415	/*
416	 * Good {morning,afternoon,evening,night}.
417	 */
418	printf("%s%s", copyright, version);
419	printf("%s\n", cpu_model);
420	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
421	printf("total memory = %s\n", pbuf);
422
423	minaddr = 0;
424	/*
425	 * Allocate a submap for exec arguments.  This map effectively
426	 * limits the number of processes exec'ing at any time.
427	 */
428	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
429				   16 * NCARGS, TRUE, FALSE, NULL);
430	/*
431	 * Allocate a submap for physio
432	 */
433	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
434				   VM_PHYS_SIZE, TRUE, FALSE, NULL);
435
436	/*
437	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
438	 * are allocated via the pool allocator, and we use KSEG to
439	 * map those pages.
440	 */
441
442#ifdef DEBUG
443	pmapdebug = opmapdebug;
444#endif
445	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
446	printf("avail memory = %s\n", pbuf);
447}
448
449/*
450 * Look up information in bootinfo of boot loader.
451 */
452void *
453lookup_bootinfo(type)
454	int type;
455{
456	struct btinfo_common *bt;
457	char *help = bootinfo;
458
459	/* Check for a bootinfo record first. */
460	if (help == NULL)
461		return (NULL);
462
463	do {
464		bt = (struct btinfo_common *)help;
465		if (bt->type == type)
466			return ((void *)help);
467		help += bt->next;
468	} while (bt->next != 0 &&
469		(size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);
470
471	return (NULL);
472}
473
474int	waittime = -1;
475
476/*
477 * call PROM to halt or reboot.
478 */
479void
480prom_halt(howto)
481	int howto;
482{
483	if (howto & RB_HALT)
484		MIPS_PROM(reinit)();
485	MIPS_PROM(reboot)();
486	/* NOTREACHED */
487}
488
489void
490cpu_reboot(howto, bootstr)
491	volatile int howto;
492	char *bootstr;
493{
494	/* take a snap shot before clobbering any registers */
495	if (curlwp)
496		savectx((struct user *)curpcb);
497
498#ifdef DEBUG
499	if (panicstr)
500		stacktrace();
501#endif
502
503	/* If system is cold, just halt. */
504	if (cold) {
505		howto |= RB_HALT;
506		goto haltsys;
507	}
508
509	/* If "always halt" was specified as a boot flag, obey. */
510	if ((boothowto & RB_HALT) != 0)
511		howto |= RB_HALT;
512
513	boothowto = howto;
514	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
515		/*
516		 * Synchronize the disks....
517		 */
518		waittime = 0;
519		vfs_shutdown();
520
521		/*
522		 * If we've been adjusting the clock, the todr
523		 * will be out of synch; adjust it now.
524		 */
525		resettodr();
526	}
527
528	/* Disable interrupts. */
529	splhigh();
530
531	/* If rebooting and a dump is requested do it. */
532#if 0
533	if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
534#else
535	if (howto & RB_DUMP)
536#endif
537		dumpsys();
538
539haltsys:
540
541	/* run any shutdown hooks */
542	doshutdownhooks();
543
544	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
545		prom_halt(0x80);	/* rom monitor RB_PWOFF */
546
547	/* Finally, halt/reboot the system. */
548	printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting...");
549	prom_halt(howto & RB_HALT);
550	/*NOTREACHED*/
551}
552
553/*
554 * Return the best possible estimate of the time in the timeval
555 * to which tvp points.  Unfortunately, we can't read the hardware registers.
556 * We guarantee that the time will be greater than the value obtained by a
557 * previous call.
558 */
559void
560microtime(tvp)
561	register struct timeval *tvp;
562{
563	static struct timeval lasttime;
564	int s = splclock();
565
566	*tvp = time;
567
568	tvp->tv_usec += (*platform.clkread)();
569
570	while (tvp->tv_usec >= 1000000) {
571		tvp->tv_usec -= 1000000;
572		tvp->tv_sec++;
573	}
574
575	if (tvp->tv_sec == lasttime.tv_sec &&
576	    tvp->tv_usec <= lasttime.tv_usec &&
577	    (tvp->tv_usec = lasttime.tv_usec + 1) > 1000000) {
578		tvp->tv_sec++;
579		tvp->tv_usec -= 1000000;
580	}
581	lasttime = *tvp;
582	splx(s);
583}
584
585int
586initcpu()
587{
588	spl0();		/* safe to turn interrupts on now */
589	return 0;
590}
591
592static void
593unimpl_cons_init()
594{
595
596	panic("sysconf.init didn't set cons_init");
597}
598
599static void
600unimpl_iointr(mask, pc, statusreg, causereg)
601	u_int mask;
602	u_int pc;
603	u_int statusreg;
604	u_int causereg;
605{
606
607	panic("sysconf.init didn't set intr");
608}
609
610static int
611unimpl_memsize(first)
612caddr_t first;
613{
614
615	panic("sysconf.init didn't set memsize");
616}
617
618static unsigned
619unimpl_clkread()
620{
621	return 0;	/* No microtime available */
622}
623
624static void
625unimpl_todr(dt)
626	struct clock_ymdhms *dt;
627{
628	panic("sysconf.init didn't init TOD");
629}
630
631void
632unimpl_intr_establish(level, func, arg)
633	int level;
634	int (*func) __P((void *));
635	void *arg;
636{
637	panic("sysconf.init didn't init intr_establish");
638}
639
640void
641delay(n)
642	int n;
643{
644	DELAY(n);
645}
646
647/*
648 * Find out how much memory is available by testing memory.
649 * Be careful to save and restore the original contents for msgbuf.
650 */
651int
652memsize_scan(first)
653	caddr_t first;
654{
655	volatile int *vp, *vp0;
656	int mem, tmp, tmp0;
657
658#define PATTERN1 0xa5a5a5a5
659#define	PATTERN2 ~PATTERN1
660
661	/*
662	 * Non destructive scan of memory to determine the size
663	 * Use the first page to test for memory aliases.  This
664	 * also has the side effect of flushing the bus alignment
665	 * buffer
666	 */
667	mem = btoc((paddr_t)first - MIPS_KSEG0_START);
668	vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
669	vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
670	tmp0 = *vp0;
671	while (vp < (int *)MIPS_MAX_MEM_ADDR) {
672		tmp = *vp;
673		*vp  = PATTERN1;
674		*vp0 = PATTERN2;
675		wbflush();
676		if (*vp != PATTERN1)
677			break;
678		*vp  = PATTERN2;
679		*vp0 = PATTERN1;
680		wbflush();
681		if (*vp != PATTERN2)
682			break;
683		*vp = tmp;
684		vp += PAGE_SIZE/sizeof(int);
685		mem++;
686	}
687	*vp0 = tmp0;
688	return mem;
689}
690
691/*
692 * Console initialization: called early on from main,
693 * before vm init or startup.  Do enough configuration
694 * to choose and initialize a console.
695 */
696
697static void
698null_cnprobe(cn)
699     struct consdev *cn;
700{
701}
702
703static void
704prom_cninit(cn)
705	struct consdev *cn;
706{
707	extern const struct cdevsw cons_cdevsw;
708
709	cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0);
710	cn->cn_pri = CN_REMOTE;
711}
712
713static int
714prom_cngetc(dev)
715	dev_t dev;
716{
717	return MIPS_PROM(getchar)();
718}
719
720static void
721prom_cnputc(dev, c)
722	dev_t dev;
723	int c;
724{
725	MIPS_PROM(putchar)(c);
726}
727
728static void
729null_cnpollc(dev, on)
730	dev_t dev;
731	int on;
732{
733}
734
735void
736consinit()
737{
738	int zs_unit;
739
740	zs_unit = 0;
741	cn_tab = &consdev_zs;
742
743	(*cn_tab->cn_init)(cn_tab);
744}
745