machdep.c revision 1.72 
1/*	$NetBSD: machdep.c,v 1.72 2010/03/02 17:28:08 pooka 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 1.72 2010/03/02 17:28:08 pooka 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#include "opt_modular.h"
86
87#include <sys/param.h>
88#include <sys/systm.h>
89#include <sys/signalvar.h>
90#include <sys/kernel.h>
91#include <sys/proc.h>
92#include <sys/buf.h>
93#include <sys/reboot.h>
94#include <sys/conf.h>
95#include <sys/file.h>
96#include <sys/callout.h>
97#include <sys/malloc.h>
98#include <sys/mbuf.h>
99#include <sys/msgbuf.h>
100#include <sys/ioctl.h>
101#include <sys/device.h>
102#include <sys/exec.h>
103#include <sys/mount.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 "opt_execfmt.h"
134
135#include "zsc.h"			/* XXX */
136#include "com.h"			/* XXX */
137#include "ksyms.h"
138
139/* Our exported CPU info; we can have only one. */
140struct cpu_info cpu_info_store;
141
142/* maps for VM objects */
143
144struct vm_map *phys_map = NULL;
145
146int	physmem;		/* max supported memory, changes to actual */
147char	*bootinfo = NULL;	/* pointer to bootinfo structure */
148
149phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
150int mem_cluster_cnt;
151
152void to_monitor(int) __attribute__((__noreturn__));
153void prom_halt(int) __attribute__((__noreturn__));
154
155#ifdef	KGDB
156void zs_kgdb_init(void);
157void kgdb_connect(int);
158#endif
159
160/*
161 *  Local functions.
162 */
163int initcpu(void);
164void configure(void);
165
166void mach_init(int, char *[], char*[], u_int, char *);
167int  memsize_scan(void *);
168
169#ifdef DEBUG
170/* stacktrace code violates prototypes to get callee's registers */
171extern void stacktrace(void); /*XXX*/
172#endif
173
174/*
175 * safepri is a safe priority for sleep to set for a spin-wait
176 * during autoconfiguration or after a panic.  Used as an argument to splx().
177 * XXX disables interrupt 5 to disable mips3 on-chip clock, which also
178 * disables mips1 FPU interrupts.
179 */
180int	safepri = MIPS3_PSL_LOWIPL;	/* XXX */
181
182/* locore callback-vector setup */
183extern void mips_vector_init(void);
184extern void prom_init(void);
185extern void pizazz_init(void);
186
187/* platform-specific initialization vector */
188static void	unimpl_cons_init(void);
189static void	unimpl_iointr(unsigned, unsigned, unsigned, unsigned);
190static int	unimpl_memsize(void *);
191static void	unimpl_intr_establish(int, int (*)(void *), void *);
192
193struct platform platform = {
194	.iobus = "iobus not set",
195	.cons_init = unimpl_cons_init,
196	.iointr = unimpl_iointr,
197	.memsize = unimpl_memsize,
198	.intr_establish = unimpl_intr_establish,
199	.clkinit = NULL,
200};
201
202struct consdev *cn_tab = NULL;
203extern struct consdev consdev_prom;
204extern struct consdev consdev_zs;
205
206static void null_cnprobe(struct consdev *);
207static void prom_cninit(struct consdev *);
208static int  prom_cngetc(dev_t);
209static void prom_cnputc(dev_t, int);
210static void null_cnpollc(dev_t, int);
211
212struct consdev consdev_prom = {
213        null_cnprobe,
214	prom_cninit,
215	prom_cngetc,
216	prom_cnputc,
217        null_cnpollc,
218};
219
220
221/*
222 * Do all the stuff that locore normally does before calling main().
223 * Process arguments passed to us by the prom monitor.
224 * Return the first page address following the system.
225 */
226void
227mach_init(int argc, char *argv[], char *envp[], u_int bim, char *bip)
228{
229	u_long first, last;
230	char *kernend;
231	char *cp;
232	int i, howto;
233	extern char edata[], end[];
234	const char *bi_msg;
235#if NKSYMS || defined(DDB) || defined(MODULAR)
236	int nsym = 0;
237	char *ssym = 0;
238	char *esym = 0;
239	struct btinfo_symtab *bi_syms;
240#endif
241
242
243	/* Check for valid bootinfo passed from bootstrap */
244	if (bim == BOOTINFO_MAGIC) {
245		struct btinfo_magic *bi_magic;
246
247		bootinfo = (char *)BOOTINFO_ADDR; /* XXX */
248		bi_magic = lookup_bootinfo(BTINFO_MAGIC);
249		if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
250			bi_msg = "invalid bootinfo structure.\n";
251		else
252			bi_msg = NULL;
253	} else
254		bi_msg = "invalid bootinfo (standalone boot?)\n";
255
256	/* clear the BSS segment */
257	kernend = (void *)mips_round_page(end);
258	memset(edata, 0, end - edata);
259
260#if NKSYMS || defined(DDB) || defined(MODULAR)
261	bi_syms = lookup_bootinfo(BTINFO_SYMTAB);
262
263	/* Load sysmbol table if present */
264	if (bi_syms != NULL) {
265		nsym = bi_syms->nsym;
266		ssym = (void *)bi_syms->ssym;
267		esym = (void *)bi_syms->esym;
268		kernend = (void *)mips_round_page(esym);
269	}
270#endif
271
272	prom_init();
273	consinit();
274
275	if (bi_msg != NULL)
276		printf(bi_msg);
277
278	/*
279	 * Set the VM page size.
280	 */
281	uvm_setpagesize();
282
283	/* Find out how much memory is available. */
284	physmem = memsize_scan(kernend);
285
286	/*
287	 * Now that we know how much memory we have, initialize the
288	 * mem cluster array.
289	 */
290	mem_clusters[0].start = 0;		/* XXX is this correct? */
291	mem_clusters[0].size  = ctob(physmem);
292	mem_cluster_cnt = 1;
293
294	/*
295	 * Copy exception-dispatch code down to exception vector.
296	 * Initialize locore-function vector.
297	 * Clear out the I and D caches.
298	 */
299	mips_vector_init();
300
301	/* Look at argv[0] and compute bootdev */
302	makebootdev(argv[0]);
303
304	/*
305	 * Look at arguments passed to us and compute boothowto.
306	 */
307	boothowto = RB_AUTOBOOT;
308	for (i = 1; i < argc; i++) {
309		for (cp = argv[i]; *cp; cp++) {
310			/* Ignore superfluous '-', if there is one */
311			if (*cp == '-')
312				continue;
313
314			howto = 0;
315			BOOT_FLAG(*cp, howto);
316			if (! howto)
317				printf("bootflag '%c' not recognised\n", *cp);
318			else
319				boothowto |= howto;
320		}
321	}
322
323
324#if NKSYMS || defined(DDB) || defined(MODULAR)
325	/* init symbols if present */
326	if (esym)
327		ksyms_addsyms_elf(esym - ssym, ssym, esym);
328#endif
329#ifdef DDB
330	if (boothowto & RB_KDB)
331		Debugger();
332#endif
333#ifdef KGDB
334	zs_kgdb_init();			/* XXX */
335	if (boothowto & RB_KDB)
336		kgdb_connect(0);
337#endif
338
339	/*
340	 * Check to see if a mini-root was loaded into memory. It resides
341	 * at the start of the next page just after the end of BSS.
342	 */
343	if (boothowto & RB_MINIROOT)
344		kernend += round_page(mfs_initminiroot(kernend));
345
346	/*
347	 * Load the rest of the available pages into the VM system.
348	 */
349	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
350	last = mem_clusters[0].start + mem_clusters[0].size;
351	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
352	    VM_FREELIST_DEFAULT);
353
354	/*
355	 * Initialize error message buffer (at end of core).
356	 */
357	mips_init_msgbuf();
358
359	/*
360	 * Initialize the virtual memory system.
361	 */
362	pmap_bootstrap();
363
364	/*
365	 * Allocate uarea page for lwp0 and set it.
366	 */
367	mips_init_lwp0_uarea();
368
369	/*
370	 * Set up interrupt handling and I/O addresses.
371	 */
372	pizazz_init();
373}
374
375
376
377/*
378 * cpu_startup: allocate memory for variable-sized tables,
379 * initialize CPU, and do autoconfiguration.
380 */
381void
382cpu_startup(void)
383{
384	vaddr_t minaddr, maxaddr;
385	char pbuf[9];
386#ifdef DEBUG
387	extern int pmapdebug;
388	int opmapdebug = pmapdebug;
389
390	pmapdebug = 0;
391#endif
392
393	/*
394	 * Good {morning,afternoon,evening,night}.
395	 */
396	printf("%s%s", copyright, version);
397	printf("%s\n", cpu_model);
398	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
399	printf("total memory = %s\n", pbuf);
400
401	minaddr = 0;
402	/*
403	 * Allocate a submap for physio
404	 */
405	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
406				   VM_PHYS_SIZE, true, false, NULL);
407
408	/*
409	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
410	 * are allocated via the pool allocator, and we use KSEG to
411	 * map those pages.
412	 */
413
414#ifdef DEBUG
415	pmapdebug = opmapdebug;
416#endif
417	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
418	printf("avail memory = %s\n", pbuf);
419}
420
421/*
422 * Look up information in bootinfo of boot loader.
423 */
424void *
425lookup_bootinfo(int type)
426{
427	struct btinfo_common *bt;
428	char *help = bootinfo;
429
430	/* Check for a bootinfo record first. */
431	if (help == NULL)
432		return (NULL);
433
434	do {
435		bt = (struct btinfo_common *)help;
436		if (bt->type == type)
437			return ((void *)help);
438		help += bt->next;
439	} while (bt->next != 0 &&
440		(size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);
441
442	return (NULL);
443}
444
445int	waittime = -1;
446
447/*
448 * call PROM to halt or reboot.
449 */
450void
451prom_halt(int howto)
452{
453	if (howto & RB_HALT)
454		MIPS_PROM(reinit)();
455	MIPS_PROM(reboot)();
456	/* NOTREACHED */
457}
458
459void
460cpu_reboot(volatile int howto, char *bootstr)
461{
462	/* take a snap shot before clobbering any registers */
463	if (curlwp)
464		savectx(curpcb);
465
466#ifdef DEBUG
467	if (panicstr)
468		stacktrace();
469#endif
470
471	/* If system is cold, just halt. */
472	if (cold) {
473		howto |= RB_HALT;
474		goto haltsys;
475	}
476
477	/* If "always halt" was specified as a boot flag, obey. */
478	if ((boothowto & RB_HALT) != 0)
479		howto |= RB_HALT;
480
481	boothowto = howto;
482	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
483		/*
484		 * Synchronize the disks....
485		 */
486		waittime = 0;
487		vfs_shutdown();
488
489		/*
490		 * If we've been adjusting the clock, the todr
491		 * will be out of synch; adjust it now.
492		 */
493		resettodr();
494	}
495
496	/* Disable interrupts. */
497	splhigh();
498
499	/* If rebooting and a dump is requested do it. */
500#if 0
501	if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
502#else
503	if (howto & RB_DUMP)
504#endif
505		dumpsys();
506
507haltsys:
508
509	/* run any shutdown hooks */
510	doshutdownhooks();
511
512	pmf_system_shutdown(boothowto);
513
514	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
515		prom_halt(0x80);	/* rom monitor RB_PWOFF */
516
517	/* Finally, halt/reboot the system. */
518	printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting...");
519	prom_halt(howto & RB_HALT);
520	/*NOTREACHED*/
521}
522
523int
524initcpu(void)
525{
526	spl0();		/* safe to turn interrupts on now */
527	return 0;
528}
529
530static void
531unimpl_cons_init(void)
532{
533
534	panic("sysconf.init didn't set cons_init");
535}
536
537static void
538unimpl_iointr(u_int mask, u_int pc, u_int statusreg, u_int causereg)
539{
540
541	panic("sysconf.init didn't set intr");
542}
543
544static int
545unimpl_memsize(void *first)
546{
547
548	panic("sysconf.init didn't set memsize");
549}
550
551void
552unimpl_intr_establish(int level, int (*func)(void *), void *arg)
553{
554	panic("sysconf.init didn't init intr_establish");
555}
556
557void
558delay(int n)
559{
560	DELAY(n);
561}
562
563/*
564 * Find out how much memory is available by testing memory.
565 * Be careful to save and restore the original contents for msgbuf.
566 */
567int
568memsize_scan(void *first)
569{
570	volatile int *vp, *vp0;
571	int mem, tmp, tmp0;
572
573#define PATTERN1 0xa5a5a5a5
574#define	PATTERN2 ~PATTERN1
575
576	/*
577	 * Non destructive scan of memory to determine the size
578	 * Use the first page to test for memory aliases.  This
579	 * also has the side effect of flushing the bus alignment
580	 * buffer
581	 */
582	mem = btoc((paddr_t)first - MIPS_KSEG0_START);
583	vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
584	vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
585	tmp0 = *vp0;
586	while (vp < (int *)MIPS_MAX_MEM_ADDR) {
587		tmp = *vp;
588		*vp  = PATTERN1;
589		*vp0 = PATTERN2;
590		wbflush();
591		if (*vp != PATTERN1)
592			break;
593		*vp  = PATTERN2;
594		*vp0 = PATTERN1;
595		wbflush();
596		if (*vp != PATTERN2)
597			break;
598		*vp = tmp;
599		vp += PAGE_SIZE/sizeof(int);
600		mem++;
601	}
602	*vp0 = tmp0;
603	return mem;
604}
605
606/*
607 * Console initialization: called early on from main,
608 * before vm init or startup.  Do enough configuration
609 * to choose and initialize a console.
610 */
611
612static void
613null_cnprobe(struct consdev *cn)
614{
615}
616
617static void
618prom_cninit(struct consdev *cn)
619{
620	extern const struct cdevsw cons_cdevsw;
621
622	cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0);
623	cn->cn_pri = CN_REMOTE;
624}
625
626static int
627prom_cngetc(dev_t dev)
628{
629	return MIPS_PROM(getchar)();
630}
631
632static void
633prom_cnputc(dev_t dev, int c)
634{
635	MIPS_PROM(putchar)(c);
636}
637
638static void
639null_cnpollc(dev_t dev, int on)
640{
641}
642
643void
644consinit(void)
645{
646	int zs_unit;
647
648	zs_unit = 0;
649	cn_tab = &consdev_zs;
650
651	(*cn_tab->cn_init)(cn_tab);
652}
653