machdep.c revision 1.49 
1/*	$NetBSD: machdep.c,v 1.49 2009/03/18 10:22:27 cegger Exp $	*/
2
3/*
4 * Copyright (c) 1982, 1986, 1990, 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.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * from: Utah $Hdr: machdep.c 1.74 92/12/20$
36 *
37 *	@(#)machdep.c	8.10 (Berkeley) 4/20/94
38 */
39/*
40 * Copyright (c) 1988 University of Utah.
41 *
42 * This code is derived from software contributed to Berkeley by
43 * the Systems Programming Group of the University of Utah Computer
44 * Science Department.
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 * from: Utah $Hdr: machdep.c 1.74 92/12/20$
75 *
76 *	@(#)machdep.c	8.10 (Berkeley) 4/20/94
77 */
78
79#include <sys/cdefs.h>
80__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.49 2009/03/18 10:22:27 cegger Exp $");
81
82#include "opt_bufcache.h"
83#include "opt_ddb.h"
84#include "opt_kgdb.h"
85#include "opt_compat_netbsd.h"
86#include "opt_sysv.h"
87#include "opt_panicbutton.h"
88
89#include <sys/param.h>
90#include <sys/systm.h>
91#include <sys/buf.h>
92#include <sys/callout.h>
93#include <sys/conf.h>
94#include <sys/exec.h>
95#include <sys/file.h>
96#include <sys/ioctl.h>
97#include <sys/kernel.h>
98#include <sys/malloc.h>
99#include <sys/mbuf.h>
100#include <sys/mount.h>
101#include <sys/msgbuf.h>
102#include <sys/proc.h>
103#include <sys/reboot.h>
104#include <sys/signalvar.h>
105#include <sys/syscallargs.h>
106#include <sys/tty.h>
107#include <sys/user.h>
108#include <sys/vnode.h>
109#include <sys/ksyms.h>
110#ifdef SYSVMSG
111#include <sys/msg.h>
112#endif
113#ifdef SYSVSEM
114#include <sys/sem.h>
115#endif
116#ifdef SYSVSHM
117#include <sys/shm.h>
118#endif
119#include <sys/kgdb.h>
120
121#include <machine/db_machdep.h>
122#include <ddb/db_sym.h>
123#include <ddb/db_extern.h>
124
125#include <machine/autoconf.h>
126#include <machine/cpu.h>
127#include <machine/reg.h>
128#include <machine/psl.h>
129#include <machine/pte.h>
130
131#define	MAXMEM	64*1024	/* XXX - from cmap.h */
132
133#include <uvm/uvm_extern.h>
134
135#include <sys/sysctl.h>
136#include <sys/device.h>
137#include <dev/cons.h>
138#include <dev/ic/z8530reg.h>
139#include <machine/z8530var.h>
140#include <cesfic/dev/zsvar.h>
141
142#include "ksyms.h"
143
144/* the following is used externally (sysctl_hw) */
145char machine[] = MACHINE;		/* CPU "architecture" */
146
147/* Our exported CPU info; we can have only one. */
148struct cpu_info cpu_info_store;
149
150struct vm_map *mb_map = NULL;
151struct vm_map *phys_map = NULL;
152
153/*
154 * Declare these as initialized data so we can patch them.
155 */
156/*int	maxmem;*/			/* max memory per process */
157int	physmem = MAXMEM;	/* max supported memory, changes to actual */
158/*
159 * safepri is a safe priority for sleep to set for a spin-wait
160 * during autoconfiguration or after a panic.
161 */
162int	safepri = PSL_LOWIPL;
163
164extern	u_int lowram;
165
166void fic_init(void);
167
168/* prototypes for local functions */
169void    identifycpu(void);
170void	dumpmem(int *, int, int);
171char	*hexstr(int, int);
172
173/* functions called from locore.s */
174void    dumpsys(void);
175void    straytrap(int, u_short);
176void	nmihand(struct frame);
177
178int	delay_divisor;		/* delay constant */
179
180extern void sicinit(void*);
181
182void fic_init(void)
183{
184	int i;
185
186	extern paddr_t avail_start, avail_end;
187
188	boothowto = RB_SINGLE; /* XXX for now */
189	boothowto |= RB_KDB; /* XXX for now */
190
191	delay_divisor = 30; /* XXX */
192
193	/*
194	 * Tell the VM system about available physical memory.  The
195	 * fic uses one segment.
196	 */
197	uvm_page_physload(atop(avail_start), atop(avail_end),
198	    atop(avail_start), atop(avail_end), VM_FREELIST_DEFAULT);
199
200	/*
201	 * map and init interrupt controller
202	 */
203	physaccess((void*)virtual_avail, (void*)0x44000000,
204	    PAGE_SIZE, PG_RW|PG_CI);
205	sicinit((void*)virtual_avail);
206	virtual_avail += PAGE_SIZE;
207
208	/*
209	 * Initialize error message buffer (at end of core).
210	 * avail_end was pre-decremented in pmap_bootstrap to compensate.
211	 */
212	for (i = 0; i < btoc(MSGBUFSIZE); i++)
213		pmap_enter(pmap_kernel(), (vaddr_t)msgbufaddr + i * PAGE_SIZE,
214		    avail_end + i * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE,
215		    VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
216	pmap_update(pmap_kernel());
217	initmsgbuf(msgbufaddr, m68k_round_page(MSGBUFSIZE));
218}
219
220int
221zs_check_kgdb(struct zs_chanstate *cs, int dev)
222{
223
224	if((boothowto & RB_KDB) && (dev == makedev(10, 0)))
225		return (1);
226	return (0);
227}
228
229void zs_kgdb_cnputc(dev_t, int);
230void zs_kgdb_cnputc(dev, c)
231dev_t dev;
232int c;
233{
234	zscnputc(dev, c);
235}
236int zs_kgdb_cngetc(dev_t);
237int zs_kgdb_cngetc(dev)
238dev_t dev;
239{
240	return (zscngetc(dev));
241}
242
243/*
244 * Console initialization: called early on from main,
245 * before vm init or startup.  Do enough configuration
246 * to choose and initialize a console.
247 */
248extern void sic_enable_int(int, int, int, int, int);
249void
250consinit(void)
251{
252
253	/*
254	 * Initialize the console before we print anything out.
255	 */
256	physaccess((void*)virtual_avail,
257	    (void*)0x58000000, PAGE_SIZE, PG_RW|PG_CI);
258	zs_cnattach((void*)virtual_avail);
259	virtual_avail += PAGE_SIZE;
260
261#ifdef KGDB
262        kgdb_dev = 1;
263        kgdb_attach((void*)zscngetc, (void*)zscnputc, (void *)0);
264
265	if (boothowto & RB_KDB) {
266		kgdb_connect(1);
267		zscons.cn_putc = zs_kgdb_cnputc;
268		zscons.cn_getc = zs_kgdb_cngetc;
269	}
270#endif
271#ifdef DDB
272	if (boothowto & RB_KDB)
273		Debugger();
274#endif
275	sic_enable_int(39, 2, 1, 7, 0); /* NMI */
276}
277
278/*
279 * cpu_startup: allocate memory for variable-sized tables,
280 * initialize CPU, and do autoconfiguration.
281 */
282void
283cpu_startup(void)
284{
285	vaddr_t minaddr, maxaddr;
286#ifdef DEBUG
287	extern int pmapdebug;
288	int opmapdebug = pmapdebug;
289
290	pmapdebug = 0;
291#endif
292
293	if (fputype != FPU_NONE)
294		m68k_make_fpu_idle_frame();
295
296	/*
297	 * Good {morning,afternoon,evening,night}.
298	 */
299	printf("%s%s", copyright, version);
300	identifycpu();
301	printf("real mem  = %d\n", ctob(physmem));
302
303	minaddr = 0;
304
305	/*
306	 * Allocate a submap for physio
307	 */
308	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
309				   VM_PHYS_SIZE, 0, false, NULL);
310
311	/*
312	 * Finally, allocate mbuf cluster submap.
313	 */
314	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
315				 nmbclusters * mclbytes, VM_MAP_INTRSAFE,
316				 false, NULL);
317
318#ifdef DEBUG
319	pmapdebug = opmapdebug;
320#endif
321	printf("avail mem = %ld\n", ptoa(uvmexp.free));
322}
323
324/*
325 * Set registers on exec.
326 * XXX Should clear registers except sp, pc,
327 * but would break init; should be fixed soon.
328 */
329void
330setregs(struct lwp *l, struct exec_package *pack, u_long stack)
331{
332	struct frame *frame = (struct frame *)l->l_md.md_regs;
333
334	frame->f_sr = PSL_USERSET;
335	frame->f_pc = pack->ep_entry & ~1;
336	frame->f_regs[D0] = 0;
337	frame->f_regs[D1] = 0;
338	frame->f_regs[D2] = 0;
339	frame->f_regs[D3] = 0;
340	frame->f_regs[D4] = 0;
341	frame->f_regs[D5] = 0;
342	frame->f_regs[D6] = 0;
343	frame->f_regs[D7] = 0;
344	frame->f_regs[A0] = 0;
345	frame->f_regs[A1] = 0;
346	frame->f_regs[A2] = (int)l->l_proc->p_psstr;
347	frame->f_regs[A3] = 0;
348	frame->f_regs[A4] = 0;
349	frame->f_regs[A5] = 0;
350	frame->f_regs[A6] = 0;
351	frame->f_regs[SP] = stack;
352
353	/* restore a null state frame */
354	l->l_addr->u_pcb.pcb_fpregs.fpf_null = 0;
355	if (fputype)
356		m68881_restore(&l->l_addr->u_pcb.pcb_fpregs);
357}
358
359/*
360 * Info for CTL_HW
361 */
362char	cpu_model[] = "FIC8234";
363
364void
365identifycpu(void)
366{
367	printf("%s\n", cpu_model);
368	printf("delay constant: %d\n", delay_divisor);
369}
370
371/*
372 * machine dependent system variables.
373 */
374SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
375{
376
377	sysctl_createv(clog, 0, NULL, NULL,
378		       CTLFLAG_PERMANENT,
379		       CTLTYPE_NODE, "machdep", NULL,
380		       NULL, 0, NULL, 0,
381		       CTL_MACHDEP, CTL_EOL);
382
383	sysctl_createv(clog, 0, NULL, NULL,
384		       CTLFLAG_PERMANENT,
385		       CTLTYPE_STRUCT, "console_device", NULL,
386		       sysctl_consdev, 0, NULL, sizeof(dev_t),
387		       CTL_MACHDEP, CPU_CONSDEV, CTL_EOL);
388}
389
390int	waittime = -1;
391
392void
393cpu_reboot(int howto, char *bootstr)
394{
395
396	/* take a snap shot before clobbering any registers */
397	if (curlwp->l_addr)
398		savectx(&curlwp->l_addr->u_pcb);
399
400	/* If system is cold, just halt. */
401	if (cold) {
402		howto |= RB_HALT;
403		goto haltsys;
404	}
405
406	boothowto = howto;
407	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
408		waittime = 0;
409		vfs_shutdown();
410		/*
411		 * If we've been adjusting the clock, the todr
412		 * will be out of synch; adjust it now.
413		 */
414		resettodr();
415	}
416
417	/* Disable interrupts. */
418	splhigh();
419
420	/* If rebooting and a dump is requested do it. */
421	if (howto & RB_DUMP)
422		dumpsys();
423
424 haltsys:
425	/* Run any shutdown hooks. */
426	doshutdownhooks();
427
428	pmf_system_shutdown(boothowto);
429
430#if defined(PANICWAIT) && !defined(DDB)
431	if ((howto & RB_HALT) == 0 && panicstr) {
432		printf("hit any key to reboot...\n");
433		(void)cngetc();
434		printf("\n");
435	}
436#endif
437
438	/* Finally, halt/reboot the system. */
439	if (howto & RB_HALT) {
440		printf("System halted.  Hit any key to reboot.\n\n");
441		(void)cngetc();
442	}
443
444	printf("rebooting...\n");
445	DELAY(1000000);
446	doboot();
447	/*NOTREACHED*/
448}
449
450/*
451 * These variables are needed by /sbin/savecore
452 */
453u_int32_t dumpmag = 0x8fca0101;	/* magic number */
454int	dumpsize = 0;		/* pages */
455long	dumplo = 0;		/* blocks */
456
457/*
458 * This is called by main to set dumplo and dumpsize.
459 * Dumps always skip the first CLBYTES of disk space
460 * in case there might be a disk label stored there.
461 * If there is extra space, put dump at the end to
462 * reduce the chance that swapping trashes it.
463 */
464void
465cpu_dumpconf(void)
466{
467	const struct bdevsw *bdev;
468	int nblks;	/* size of dump area */
469
470	if (dumpdev == NODEV)
471		return;
472	bdev = bdevsw_lookup(dumpdev);
473	if (bdev == NULL) {
474		dumpdev = NODEV;
475		return;
476	}
477	if (bdev->d_psize == NULL)
478		return;
479	nblks = (*bdev->d_psize)(dumpdev);
480	if (nblks <= ctod(1))
481		return;
482
483	/*
484	 * XXX include the final RAM page which is not included in physmem.
485	 */
486	dumpsize = physmem + 1;
487
488	/* Always skip the first CLBYTES, in case there is a label there. */
489	if (dumplo < ctod(1))
490		dumplo = ctod(1);
491
492	/* Put dump at end of partition, and make it fit. */
493	if (dumpsize > dtoc(nblks - dumplo))
494		dumpsize = dtoc(nblks - dumplo);
495	if (dumplo < nblks - ctod(dumpsize))
496		dumplo = nblks - ctod(dumpsize);
497}
498
499/*
500 * Dump physical memory onto the dump device.  Called by doadump()
501 * in locore.s or by cpu_reboot() here in machdep.c
502 */
503void
504dumpsys(void)
505{
506	const struct bdevsw *bdev;
507	daddr_t blkno;		/* current block to write */
508				/* dump routine */
509	int (*dump)(dev_t, daddr_t, void *, size_t);
510	int pg;			/* page being dumped */
511	vm_offset_t maddr;	/* PA being dumped */
512	int error;		/* error code from (*dump)() */
513
514	/* Don't put dump messages in msgbuf. */
515	msgbufmapped = 0;
516
517	/* Make sure dump device is valid. */
518	if (dumpdev == NODEV)
519		return;
520	bdev = bdevsw_lookup(dumpdev);
521	if (bdev == NULL)
522		return;
523	if (dumpsize == 0) {
524		cpu_dumpconf();
525		if (dumpsize == 0)
526			return;
527	}
528	if (dumplo < 0)
529		return;
530	dump = bdev->d_dump;
531	blkno = dumplo;
532
533	printf("\ndumping to dev 0x%x, offset %ld\n", dumpdev, dumplo);
534
535	printf("dump ");
536	maddr = lowram;
537	for (pg = 0; pg < dumpsize; pg++) {
538#define NPGMB	(1024*1024/PAGE_SIZE)
539		/* print out how many MBs we have dumped */
540		if (pg && (pg % NPGMB) == 0)
541			printf("%d ", pg / NPGMB);
542#undef NPGMB
543		pmap_enter(pmap_kernel(), (vm_offset_t)vmmap, maddr,
544		    VM_PROT_READ, VM_PROT_READ|PMAP_WIRED);
545		pmap_update(pmap_kernel());
546
547		error = (*dump)(dumpdev, blkno, vmmap, PAGE_SIZE);
548		switch (error) {
549		case 0:
550			maddr += PAGE_SIZE;
551			blkno += btodb(PAGE_SIZE);
552			break;
553
554		case ENXIO:
555			printf("device bad\n");
556			return;
557
558		case EFAULT:
559			printf("device not ready\n");
560			return;
561
562		case EINVAL:
563			printf("area improper\n");
564			return;
565
566		case EIO:
567			printf("i/o error\n");
568			return;
569
570		case EINTR:
571			printf("aborted from console\n");
572			return;
573
574		default:
575			printf("error %d\n", error);
576			return;
577		}
578	}
579	printf("succeeded\n");
580}
581
582void
583straytrap(int pc, u_short evec)
584{
585	printf("unexpected trap (vector offset %x) from %x\n",
586	       evec & 0xFFF, pc);
587}
588
589/* XXX should change the interface, and make one badaddr() function */
590
591int	*nofault;
592
593int
594badaddr(void *addr)
595{
596	int i;
597	label_t	faultbuf;
598
599	nofault = (int *) &faultbuf;
600	if (setjmp((label_t *)nofault)) {
601		nofault = (int *) 0;
602		return (1);
603	}
604	i = *(volatile short *)addr;
605	nofault = (int *) 0;
606	return (0);
607}
608
609int
610badbaddr(void *addr)
611{
612	int i;
613	label_t	faultbuf;
614
615	nofault = (int *) &faultbuf;
616	if (setjmp((label_t *)nofault)) {
617		nofault = (int *) 0;
618		return (1);
619	}
620	i = *(volatile char *)addr;
621	nofault = (int *) 0;
622	return (0);
623}
624
625#ifdef PANICBUTTON
626/*
627 * Declare these so they can be patched.
628 */
629int panicbutton = 1;	/* non-zero if panic buttons are enabled */
630int candbdiv = 2;	/* give em half a second (hz / candbdiv) */
631
632void	candbtimer(void *);
633
634int crashandburn;
635
636void
637candbtimer(void *arg)
638{
639
640	crashandburn = 0;
641}
642#endif /* PANICBUTTON */
643
644static int innmihand;	/* simple mutex */
645
646/*
647 * Level 7 interrupts can be caused by the keyboard or parity errors.
648 */
649void
650nmihand(struct frame frame)
651{
652
653	/* Prevent unwanted recursion. */
654	if (innmihand)
655		return;
656	innmihand = 1;
657
658	printf("NMI\n");
659#if defined(DDB) || defined(KGDB)
660	Debugger();
661#endif
662
663	innmihand = 0;
664}
665
666
667/*
668 * cpu_exec_aout_makecmds():
669 *	CPU-dependent a.out format hook for execve().
670 *
671 * Determine of the given exec package refers to something which we
672 * understand and, if so, set up the vmcmds for it.
673 *
674 * XXX what are the special cases for the hp300?
675 * XXX why is this COMPAT_NOMID?  was something generating
676 *	hp300 binaries with an a_mid of 0?  i thought that was only
677 *	done on little-endian machines...  -- cgd
678 */
679int
680cpu_exec_aout_makecmds(struct lwp *l, struct exec_package *epp)
681{
682#if defined(COMPAT_NOMID) || defined(COMPAT_44)
683	u_long midmag, magic;
684	u_short mid;
685	int error;
686	struct exec *execp = epp->ep_hdr;
687
688	midmag = ntohl(execp->a_midmag);
689	mid = (midmag >> 16) & 0xffff;
690	magic = midmag & 0xffff;
691
692	midmag = mid << 16 | magic;
693
694	switch (midmag) {
695#ifdef COMPAT_NOMID
696	case (MID_ZERO << 16) | ZMAGIC:
697		error = exec_aout_prep_oldzmagic(l, epp);
698		return (error);
699#endif
700#ifdef COMPAT_44
701	case (MID_HP300 << 16) | ZMAGIC:
702		error = exec_aout_prep_oldzmagic(l, epp);
703		return (error);
704#endif
705	}
706#endif /* !(defined(COMPAT_NOMID) || defined(COMPAT_44)) */
707
708	return ENOEXEC;
709}
710