machdep.c revision 1.72 
1/*	$NetBSD: machdep.c,v 1.72 2021/10/09 20:00:41 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990, 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.
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 * from: Utah $Hdr: machdep.c 1.74 92/12/20$
37 *
38 *	@(#)machdep.c	8.10 (Berkeley) 4/20/94
39 */
40
41#include <sys/cdefs.h>
42__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.72 2021/10/09 20:00:41 tsutsui Exp $");
43
44#include "opt_bufcache.h"
45#include "opt_ddb.h"
46#include "opt_kgdb.h"
47#include "opt_compat_netbsd.h"
48#include "opt_sysv.h"
49#include "opt_panicbutton.h"
50#include "opt_modular.h"
51
52#include <sys/param.h>
53#include <sys/systm.h>
54#include <sys/buf.h>
55#include <sys/callout.h>
56#include <sys/conf.h>
57#include <sys/exec.h>
58#include <sys/exec_aout.h>		/* for MID_* */
59#include <sys/file.h>
60#include <sys/ioctl.h>
61#include <sys/kernel.h>
62#include <sys/malloc.h>
63#include <sys/mbuf.h>
64#include <sys/mount.h>
65#include <sys/msgbuf.h>
66#include <sys/proc.h>
67#include <sys/reboot.h>
68#include <sys/signalvar.h>
69#include <sys/syscallargs.h>
70#include <sys/tty.h>
71#include <sys/vnode.h>
72#include <sys/ksyms.h>
73#include <sys/module.h>
74#include <sys/cpu.h>
75#include <sys/kgdb.h>
76
77#include <machine/db_machdep.h>
78#include <ddb/db_sym.h>
79#include <ddb/db_extern.h>
80
81#include <machine/autoconf.h>
82#include <machine/cpu.h>
83#include <machine/reg.h>
84#include <machine/pcb.h>
85#include <machine/psl.h>
86#include <machine/pte.h>
87
88#define	MAXMEM	64*1024	/* XXX - from cmap.h */
89
90#include <uvm/uvm_extern.h>
91
92#include <sys/sysctl.h>
93#include <sys/device.h>
94#include <dev/cons.h>
95#include <dev/mm.h>
96#include <dev/ic/z8530reg.h>
97#include <machine/z8530var.h>
98#include <cesfic/dev/zsvar.h>
99
100#include "ksyms.h"
101
102/* the following is used externally (sysctl_hw) */
103char machine[] = MACHINE;		/* CPU "architecture" */
104
105/* Our exported CPU info; we can have only one. */
106struct cpu_info cpu_info_store;
107
108struct vm_map *phys_map = NULL;
109
110/*
111 * Declare these as initialized data so we can patch them.
112 */
113/*int	maxmem;*/			/* max memory per process */
114extern psize_t physmem;			/* max supported memory, changes to actual */
115
116extern	u_int lowram;
117
118void fic_init(void);
119
120/* prototypes for local functions */
121void    identifycpu(void);
122char	*hexstr(int, int);
123
124/* functions called from locore.s */
125void    dumpsys(void);
126void    straytrap(int, u_short);
127void	nmihand(struct frame);
128
129int	delay_divisor;		/* delay constant */
130
131extern void sicinit(void*);
132
133void fic_init(void)
134{
135	int i;
136
137	extern paddr_t avail_start, avail_end;
138
139	boothowto = RB_SINGLE; /* XXX for now */
140	boothowto |= RB_KDB; /* XXX for now */
141
142	delay_divisor = 30; /* XXX */
143
144	/*
145	 * Tell the VM system about available physical memory.  The
146	 * fic uses one segment.
147	 */
148	uvm_page_physload(atop(avail_start), atop(avail_end),
149	    atop(avail_start), atop(avail_end), VM_FREELIST_DEFAULT);
150
151	/*
152	 * map and init interrupt controller
153	 */
154	physaccess((void*)virtual_avail, (void*)0x44000000,
155	    PAGE_SIZE, PG_RW|PG_CI);
156	sicinit((void*)virtual_avail);
157	virtual_avail += PAGE_SIZE;
158
159	/*
160	 * Initialize error message buffer (at end of core).
161	 * avail_end was pre-decremented in pmap_bootstrap to compensate.
162	 */
163	for (i = 0; i < btoc(MSGBUFSIZE); i++)
164		pmap_enter(pmap_kernel(), (vaddr_t)msgbufaddr + i * PAGE_SIZE,
165		    avail_end + i * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE,
166		    VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED);
167	pmap_update(pmap_kernel());
168	initmsgbuf(msgbufaddr, m68k_round_page(MSGBUFSIZE));
169}
170
171int
172zs_check_kgdb(struct zs_chanstate *cs, int dev)
173{
174
175	if((boothowto & RB_KDB) && (dev == makedev(10, 0)))
176		return (1);
177	return (0);
178}
179
180void zs_kgdb_cnputc(dev_t, int);
181void zs_kgdb_cnputc(dev_t dev, int c)
182{
183	zscnputc(dev, c);
184}
185int zs_kgdb_cngetc(dev_t);
186int zs_kgdb_cngetc(dev_t dev)
187{
188	return (zscngetc(dev));
189}
190
191/*
192 * Console initialization: called early on from main,
193 * before vm init or startup.  Do enough configuration
194 * to choose and initialize a console.
195 */
196extern void sic_enable_int(int, int, int, int, int);
197void
198consinit(void)
199{
200
201	/*
202	 * Initialize the console before we print anything out.
203	 */
204	physaccess((void*)virtual_avail,
205	    (void*)0x58000000, PAGE_SIZE, PG_RW|PG_CI);
206	zs_cnattach((void*)virtual_avail);
207	virtual_avail += PAGE_SIZE;
208
209#ifdef KGDB
210        kgdb_dev = 1;
211        kgdb_attach((void*)zscngetc, (void*)zscnputc, (void *)0);
212
213	if (boothowto & RB_KDB) {
214		kgdb_connect(1);
215		zscons.cn_putc = zs_kgdb_cnputc;
216		zscons.cn_getc = zs_kgdb_cngetc;
217	}
218#endif
219#ifdef DDB
220	if (boothowto & RB_KDB)
221		Debugger();
222#endif
223	sic_enable_int(39, 2, 1, 7, 0); /* NMI */
224}
225
226/*
227 * cpu_startup: allocate memory for variable-sized tables,
228 * initialize CPU, and do autoconfiguration.
229 */
230void
231cpu_startup(void)
232{
233	vaddr_t minaddr, maxaddr;
234#ifdef DEBUG
235	extern int pmapdebug;
236	int opmapdebug = pmapdebug;
237
238	pmapdebug = 0;
239#endif
240
241	cpu_setmodel("FIC8234");
242	if (fputype != FPU_NONE)
243		m68k_make_fpu_idle_frame();
244
245	/*
246	 * Good {morning,afternoon,evening,night}.
247	 */
248	printf("%s%s", copyright, version);
249	identifycpu();
250	printf("real mem  = %d\n", ctob(physmem));
251
252	minaddr = 0;
253
254	/*
255	 * Allocate a submap for physio
256	 */
257	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
258				   VM_PHYS_SIZE, 0, false, NULL);
259
260#ifdef DEBUG
261	pmapdebug = opmapdebug;
262#endif
263	printf("avail mem = %ld\n", ptoa(uvm_availmem(false)));
264}
265
266/*
267 * Info for CTL_HW
268 */
269
270void
271identifycpu(void)
272{
273	printf("%s\n", cpu_getmodel());
274	printf("delay constant: %d\n", delay_divisor);
275}
276
277/*
278 * machine dependent system variables.
279 */
280SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
281{
282
283	sysctl_createv(clog, 0, NULL, NULL,
284		       CTLFLAG_PERMANENT,
285		       CTLTYPE_NODE, "machdep", NULL,
286		       NULL, 0, NULL, 0,
287		       CTL_MACHDEP, CTL_EOL);
288
289	sysctl_createv(clog, 0, NULL, NULL,
290		       CTLFLAG_PERMANENT,
291		       CTLTYPE_STRUCT, "console_device", NULL,
292		       sysctl_consdev, 0, NULL, sizeof(dev_t),
293		       CTL_MACHDEP, CPU_CONSDEV, CTL_EOL);
294}
295
296int	waittime = -1;
297
298void
299cpu_reboot(int howto, char *bootstr)
300{
301	struct pcb *pcb = lwp_getpcb(curlwp);
302
303	/* take a snap shot before clobbering any registers */
304	if (pcb != NULL)
305		savectx(pcb);
306
307	/* If system is cold, just halt. */
308	if (cold) {
309		howto |= RB_HALT;
310		goto haltsys;
311	}
312
313	boothowto = howto;
314	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
315		waittime = 0;
316		vfs_shutdown();
317		/*
318		 * If we've been adjusting the clock, the todr
319		 * will be out of synch; adjust it now.
320		 */
321		resettodr();
322	}
323
324	/* Disable interrupts. */
325	splhigh();
326
327	/* If rebooting and a dump is requested do it. */
328	if (howto & RB_DUMP)
329		dumpsys();
330
331 haltsys:
332	/* Run any shutdown hooks. */
333	doshutdownhooks();
334
335	pmf_system_shutdown(boothowto);
336
337#if defined(PANICWAIT) && !defined(DDB)
338	if ((howto & RB_HALT) == 0 && panicstr) {
339		printf("hit any key to reboot...\n");
340		cnpollc(1);
341		(void)cngetc();
342		cnpollc(0);
343		printf("\n");
344	}
345#endif
346
347	/* Finally, halt/reboot the system. */
348	if (howto & RB_HALT) {
349		printf("System halted.  Hit any key to reboot.\n\n");
350		cnpollc(1);
351		(void)cngetc();
352		cnpollc(0);
353	}
354
355	printf("rebooting...\n");
356	DELAY(1000000);
357	doboot();
358	/*NOTREACHED*/
359}
360
361/*
362 * These variables are needed by /sbin/savecore
363 */
364u_int32_t dumpmag = 0x8fca0101;	/* magic number */
365int	dumpsize = 0;		/* pages */
366long	dumplo = 0;		/* blocks */
367
368/*
369 * This is called by main to set dumplo and dumpsize.
370 * Dumps always skip the first CLBYTES of disk space
371 * in case there might be a disk label stored there.
372 * If there is extra space, put dump at the end to
373 * reduce the chance that swapping trashes it.
374 */
375void
376cpu_dumpconf(void)
377{
378	int nblks;	/* size of dump area */
379
380	if (dumpdev == NODEV)
381		return;
382	nblks = bdev_size(dumpdev);
383	if (nblks <= ctod(1))
384		return;
385
386	/*
387	 * XXX include the final RAM page which is not included in physmem.
388	 */
389	dumpsize = physmem + 1;
390
391	/* Always skip the first CLBYTES, in case there is a label there. */
392	if (dumplo < ctod(1))
393		dumplo = ctod(1);
394
395	/* Put dump at end of partition, and make it fit. */
396	if (dumpsize > dtoc(nblks - dumplo))
397		dumpsize = dtoc(nblks - dumplo);
398	if (dumplo < nblks - ctod(dumpsize))
399		dumplo = nblks - ctod(dumpsize);
400}
401
402/*
403 * Dump physical memory onto the dump device.  Called by doadump()
404 * in locore.s or by cpu_reboot() here in machdep.c
405 */
406void
407dumpsys(void)
408{
409	const struct bdevsw *bdev;
410	daddr_t blkno;		/* current block to write */
411				/* dump routine */
412	int (*dump)(dev_t, daddr_t, void *, size_t);
413	int pg;			/* page being dumped */
414	vm_offset_t maddr;	/* PA being dumped */
415	int error;		/* error code from (*dump)() */
416
417	/* Don't put dump messages in msgbuf. */
418	msgbufmapped = 0;
419
420	/* Make sure dump device is valid. */
421	if (dumpdev == NODEV)
422		return;
423	bdev = bdevsw_lookup(dumpdev);
424	if (bdev == NULL)
425		return;
426	if (dumpsize == 0) {
427		cpu_dumpconf();
428		if (dumpsize == 0)
429			return;
430	}
431	if (dumplo < 0)
432		return;
433	dump = bdev->d_dump;
434	blkno = dumplo;
435
436	printf("\ndumping to dev %"PRIx64", offset %ld\n", dumpdev, dumplo);
437
438	printf("dump ");
439	maddr = lowram;
440	for (pg = 0; pg < dumpsize; pg++) {
441#define NPGMB	(1024*1024/PAGE_SIZE)
442		/* print out how many MBs we have dumped */
443		if (pg && (pg % NPGMB) == 0)
444			printf("%d ", pg / NPGMB);
445#undef NPGMB
446		pmap_enter(pmap_kernel(), (vm_offset_t)vmmap, maddr,
447		    VM_PROT_READ, VM_PROT_READ|PMAP_WIRED);
448		pmap_update(pmap_kernel());
449
450		error = (*dump)(dumpdev, blkno, vmmap, PAGE_SIZE);
451		switch (error) {
452		case 0:
453			maddr += PAGE_SIZE;
454			blkno += btodb(PAGE_SIZE);
455			break;
456
457		case ENXIO:
458			printf("device bad\n");
459			return;
460
461		case EFAULT:
462			printf("device not ready\n");
463			return;
464
465		case EINVAL:
466			printf("area improper\n");
467			return;
468
469		case EIO:
470			printf("i/o error\n");
471			return;
472
473		case EINTR:
474			printf("aborted from console\n");
475			return;
476
477		default:
478			printf("error %d\n", error);
479			return;
480		}
481	}
482	printf("succeeded\n");
483}
484
485void
486straytrap(int pc, u_short evec)
487{
488	printf("unexpected trap (vector offset %x) from %x\n",
489	       evec & 0xFFF, pc);
490}
491
492/* XXX should change the interface, and make one badaddr() function */
493
494int	*nofault;
495
496int
497badaddr(void *addr)
498{
499	int i;
500	label_t	faultbuf;
501
502	nofault = (int *) &faultbuf;
503	if (setjmp((label_t *)nofault)) {
504		nofault = (int *) 0;
505		return (1);
506	}
507	i = *(volatile short *)addr;
508	__USE(i);
509	nofault = (int *) 0;
510	return (0);
511}
512
513int
514badbaddr(void *addr)
515{
516	int i;
517	label_t	faultbuf;
518
519	nofault = (int *) &faultbuf;
520	if (setjmp((label_t *)nofault)) {
521		nofault = (int *) 0;
522		return (1);
523	}
524	i = *(volatile char *)addr;
525	__USE(i);
526	nofault = (int *) 0;
527	return (0);
528}
529
530#ifdef PANICBUTTON
531/*
532 * Declare these so they can be patched.
533 */
534int panicbutton = 1;	/* non-zero if panic buttons are enabled */
535int candbdiv = 2;	/* give em half a second (hz / candbdiv) */
536
537void	candbtimer(void *);
538
539int crashandburn;
540
541void
542candbtimer(void *arg)
543{
544
545	crashandburn = 0;
546}
547#endif /* PANICBUTTON */
548
549static int innmihand;	/* simple mutex */
550
551/*
552 * Level 7 interrupts can be caused by the keyboard or parity errors.
553 */
554void
555nmihand(struct frame frame)
556{
557
558	/* Prevent unwanted recursion. */
559	if (innmihand)
560		return;
561	innmihand = 1;
562
563	printf("NMI\n");
564#if defined(DDB) || defined(KGDB)
565	Debugger();
566#endif
567
568	innmihand = 0;
569}
570
571
572/*
573 * cpu_exec_aout_makecmds():
574 *	CPU-dependent a.out format hook for execve().
575 *
576 * Determine of the given exec package refers to something which we
577 * understand and, if so, set up the vmcmds for it.
578 *
579 * XXX what are the special cases for the hp300?
580 * XXX why is this COMPAT_NOMID?  was something generating
581 *	hp300 binaries with an a_mid of 0?  i thought that was only
582 *	done on little-endian machines...  -- cgd
583 */
584int
585cpu_exec_aout_makecmds(struct lwp *l, struct exec_package *epp)
586{
587#if defined(COMPAT_NOMID) || defined(COMPAT_44)
588	u_long midmag, magic;
589	u_short mid;
590	int error;
591	struct exec *execp = epp->ep_hdr;
592
593	midmag = ntohl(execp->a_midmag);
594	mid = (midmag >> 16) & 0xffff;
595	magic = midmag & 0xffff;
596
597	midmag = mid << 16 | magic;
598
599	switch (midmag) {
600#ifdef COMPAT_NOMID
601	case (MID_ZERO << 16) | ZMAGIC:
602		error = exec_aout_prep_oldzmagic(l, epp);
603		return (error);
604#endif
605#ifdef COMPAT_44
606	case (MID_HP300 << 16) | ZMAGIC:
607		error = exec_aout_prep_oldzmagic(l, epp);
608		return (error);
609#endif
610	}
611#endif /* !(defined(COMPAT_NOMID) || defined(COMPAT_44)) */
612
613	return ENOEXEC;
614}
615
616int
617mm_md_physacc(paddr_t pa, vm_prot_t prot)
618{
619
620	return (pa < lowram || pa >= 0xfffffffc) ? EFAULT : 0;
621}
622
623#ifdef MODULAR
624/*
625 * Push any modules loaded by the bootloader etc.
626 */
627void
628module_init_md(void)
629{
630}
631#endif
632