1/*	$NetBSD: machdep.c,v 1.82 2024/03/05 14:15:33 thorpej 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. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)machdep.c	8.3 (Berkeley) 1/12/94
38 */
39
40#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
41
42__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.82 2024/03/05 14:15:33 thorpej Exp $");
43
44/* from: Utah Hdr: machdep.c 1.63 91/04/24 */
45
46#include "opt_ddb.h"
47#include "opt_kgdb.h"
48#include "opt_modular.h"
49#include "opt_execfmt.h"
50
51#include "zsc.h"			/* XXX */
52#include "com.h"			/* XXX */
53#include "ksyms.h"
54
55#include <sys/param.h>
56#include <sys/boot_flag.h>
57#include <sys/conf.h>
58#include <sys/cpu.h>
59#include <sys/device.h>
60#include <sys/intr.h>
61#include <sys/kcore.h>
62#include <sys/ksyms.h>
63#include <sys/kernel.h>
64#include <sys/reboot.h>
65#include <sys/systm.h>
66
67#include <uvm/uvm_extern.h>
68
69#include <ufs/mfs/mfs_extern.h>		/* mfs_initminiroot() */
70
71#include <dev/clock_subr.h>
72#include <dev/cons.h>
73
74#ifdef DDB
75#include <machine/db_machdep.h>
76#include <ddb/db_extern.h>
77#endif
78
79#include <machine/mainboard.h>
80#include <machine/sysconf.h>
81#include <machine/autoconf.h>
82#include <machine/bootinfo.h>
83#include <machine/prom.h>
84
85/* maps for VM objects */
86
87struct vm_map *phys_map = NULL;
88
89char	*bootinfo = NULL;	/* pointer to bootinfo structure */
90
91phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
92int mem_cluster_cnt;
93
94void to_monitor(int) __dead;
95void prom_halt(int) __dead;
96
97#ifdef	KGDB
98void zs_kgdb_init(void);
99void kgdb_connect(int);
100#endif
101
102/*
103 *  Local functions.
104 */
105int initcpu(void);
106void configure(void);
107
108void mach_init(int, char *[], char*[], u_int, char *);
109int  memsize_scan(void *);
110
111#ifdef DEBUG
112/* stacktrace code violates prototypes to get callee's registers */
113extern void stacktrace(void); /*XXX*/
114#endif
115
116/* locore callback-vector setup */
117extern void prom_init(void);
118extern void pizazz_init(void);
119
120/* platform-specific initialization vector */
121static void	unimpl_cons_init(void);
122static void	unimpl_iointr(uint32_t, vaddr_t, uint32_t);
123static int	unimpl_memsize(void *);
124static void	unimpl_intr_establish(int, int (*)(void *), void *);
125
126struct platform platform = {
127	.iobus = "iobus not set",
128	.cons_init = unimpl_cons_init,
129	.iointr = unimpl_iointr,
130	.memsize = unimpl_memsize,
131	.intr_establish = unimpl_intr_establish,
132	.clkinit = NULL,
133};
134
135extern struct consdev consdev_prom;
136extern struct consdev consdev_zs;
137
138static void null_cnprobe(struct consdev *);
139static void prom_cninit(struct consdev *);
140static int  prom_cngetc(dev_t);
141static void prom_cnputc(dev_t, int);
142static void null_cnpollc(dev_t, int);
143
144struct consdev consdev_prom = {
145        null_cnprobe,
146	prom_cninit,
147	prom_cngetc,
148	prom_cnputc,
149        null_cnpollc,
150};
151
152
153/*
154 * Do all the stuff that locore normally does before calling main().
155 * Process arguments passed to us by the prom monitor.
156 * Return the first page address following the system.
157 */
158void
159mach_init(int argc, char *argv[], char *envp[], u_int bim, char *bip)
160{
161	u_long first, last;
162	char *kernend;
163	char *cp;
164	int i, howto;
165	extern char edata[], end[];
166	const char *bi_msg;
167#if NKSYMS || defined(DDB) || defined(MODULAR)
168	char *ssym = 0;
169	char *esym = 0;
170	struct btinfo_symtab *bi_syms;
171#endif
172
173	/* Check for valid bootinfo passed from bootstrap */
174	if (bim == BOOTINFO_MAGIC) {
175		struct btinfo_magic *bi_magic;
176
177		bootinfo = (char *)BOOTINFO_ADDR; /* XXX */
178		bi_magic = lookup_bootinfo(BTINFO_MAGIC);
179		if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
180			bi_msg = "invalid bootinfo structure.\n";
181		else
182			bi_msg = NULL;
183	} else
184		bi_msg = "invalid bootinfo (standalone boot?)\n";
185
186	/* clear the BSS segment */
187	kernend = (void *)mips_round_page(end);
188	memset(edata, 0, end - edata);
189
190	/*
191	 * Copy exception-dispatch code down to exception vector.
192	 * Initialize locore-function vector.
193	 * Clear out the I and D caches.
194	 */
195	mips_vector_init(NULL, false);
196
197#if NKSYMS || defined(DDB) || defined(LKM)
198	bi_syms = lookup_bootinfo(BTINFO_SYMTAB);
199
200	/* Load symbol table if present */
201	if (bi_syms != NULL) {
202		ssym = (void *)bi_syms->ssym;
203		esym = (void *)bi_syms->esym;
204		kernend = (void *)mips_round_page(esym);
205	}
206#endif
207
208	prom_init();
209	consinit();
210
211	if (bi_msg != NULL)
212		printf(bi_msg);
213
214	uvm_md_init();
215
216	/* Find out how much memory is available. */
217	physmem = memsize_scan(kernend);
218
219	/*
220	 * Now that we know how much memory we have, initialize the
221	 * mem cluster array.
222	 */
223	mem_clusters[0].start = 0;		/* XXX is this correct? */
224	mem_clusters[0].size  = ctob(physmem);
225	mem_cluster_cnt = 1;
226
227	/* Look at argv[0] and compute bootdev */
228	makebootdev(argv[0]);
229
230	/*
231	 * Look at arguments passed to us and compute boothowto.
232	 */
233	boothowto = RB_AUTOBOOT;
234	for (i = 1; i < argc; i++) {
235		for (cp = argv[i]; *cp; cp++) {
236			/* Ignore superfluous '-', if there is one */
237			if (*cp == '-')
238				continue;
239
240			howto = 0;
241			BOOT_FLAG(*cp, howto);
242			if (! howto)
243				printf("bootflag '%c' not recognised\n", *cp);
244			else
245				boothowto |= howto;
246		}
247	}
248
249
250#if NKSYMS || defined(DDB) || defined(MODULAR)
251	/* init symbols if present */
252	if (esym)
253		ksyms_addsyms_elf(esym - ssym, ssym, esym);
254#endif
255#ifdef DDB
256	if (boothowto & RB_KDB)
257		Debugger();
258#endif
259#ifdef KGDB
260	zs_kgdb_init();			/* XXX */
261	if (boothowto & RB_KDB)
262		kgdb_connect(0);
263#endif
264
265	/*
266	 * Check to see if a mini-root was loaded into memory. It resides
267	 * at the start of the next page just after the end of BSS.
268	 */
269	if (boothowto & RB_MINIROOT)
270		kernend += round_page(mfs_initminiroot(kernend));
271
272	/*
273	 * Load the rest of the available pages into the VM system.
274	 */
275	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
276	last = mem_clusters[0].start + mem_clusters[0].size;
277	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
278	    VM_FREELIST_DEFAULT);
279
280	/*
281	 * Initialize error message buffer (at end of core).
282	 */
283	mips_init_msgbuf();
284
285	/*
286	 * Initialize the virtual memory system.
287	 */
288	pmap_bootstrap();
289
290	/*
291	 * Allocate uarea page for lwp0 and set it.
292	 */
293	mips_init_lwp0_uarea();
294
295	/*
296	 * Set up interrupt handling and I/O addresses.
297	 */
298	pizazz_init();
299}
300
301
302
303/*
304 * cpu_startup: allocate memory for variable-sized tables,
305 * initialize CPU, and do autoconfiguration.
306 */
307void
308cpu_startup(void)
309{
310	cpu_startup_common();
311}
312
313/*
314 * Look up information in bootinfo of boot loader.
315 */
316void *
317lookup_bootinfo(int type)
318{
319	struct btinfo_common *bt;
320	char *help = bootinfo;
321
322	/* Check for a bootinfo record first. */
323	if (help == NULL)
324		return (NULL);
325
326	do {
327		bt = (struct btinfo_common *)help;
328		if (bt->type == type)
329			return ((void *)help);
330		help += bt->next;
331	} while (bt->next != 0 &&
332		(size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);
333
334	return (NULL);
335}
336
337int	waittime = -1;
338
339/*
340 * call PROM to halt or reboot.
341 */
342void
343prom_halt(int howto)
344{
345	if (howto & RB_HALT)
346		MIPS_PROM(reinit)();
347	MIPS_PROM(reboot)();
348	/* NOTREACHED */
349}
350
351void
352cpu_reboot(volatile int howto, char *bootstr)
353{
354	/* take a snap shot before clobbering any registers */
355	savectx(curpcb);
356
357#ifdef DEBUG
358	if (panicstr)
359		stacktrace();
360#endif
361
362	/* If system is cold, just halt. */
363	if (cold) {
364		howto |= RB_HALT;
365		goto haltsys;
366	}
367
368	/* If "always halt" was specified as a boot flag, obey. */
369	if ((boothowto & RB_HALT) != 0)
370		howto |= RB_HALT;
371
372	boothowto = howto;
373	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
374		/*
375		 * Synchronize the disks....
376		 */
377		waittime = 0;
378		vfs_shutdown();
379	}
380
381	/* Disable interrupts. */
382	splhigh();
383
384	/* If rebooting and a dump is requested do it. */
385#if 0
386	if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
387#else
388	if (howto & RB_DUMP)
389#endif
390		dumpsys();
391
392haltsys:
393
394	/* run any shutdown hooks */
395	doshutdownhooks();
396
397	pmf_system_shutdown(boothowto);
398
399	if ((howto & RB_POWERDOWN) == RB_POWERDOWN)
400		prom_halt(0x80);	/* rom monitor RB_PWOFF */
401
402	/* Finally, halt/reboot the system. */
403	printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting...");
404	prom_halt(howto & RB_HALT);
405	/*NOTREACHED*/
406}
407
408int
409initcpu(void)
410{
411	spl0();		/* safe to turn interrupts on now */
412	return 0;
413}
414
415static void
416unimpl_cons_init(void)
417{
418
419	panic("sysconf.init didn't set cons_init");
420}
421
422static void
423unimpl_iointr(uint32_t status, vaddr_t pc, uint32_t ipending)
424{
425
426	panic("sysconf.init didn't set intr");
427}
428
429static int
430unimpl_memsize(void *first)
431{
432
433	panic("sysconf.init didn't set memsize");
434}
435
436void
437unimpl_intr_establish(int level, int (*func)(void *), void *arg)
438{
439	panic("sysconf.init didn't init intr_establish");
440}
441
442void
443delay(int n)
444{
445	DELAY(n);
446}
447
448/*
449 * Find out how much memory is available by testing memory.
450 * Be careful to save and restore the original contents for msgbuf.
451 */
452int
453memsize_scan(void *first)
454{
455	volatile int *vp, *vp0;
456	int mem, tmp, tmp0;
457
458#define PATTERN1 0xa5a5a5a5
459#define	PATTERN2 ~PATTERN1
460
461	/*
462	 * Non destructive scan of memory to determine the size
463	 * Use the first page to test for memory aliases.  This
464	 * also has the side effect of flushing the bus alignment
465	 * buffer
466	 */
467	mem = btoc((paddr_t)first - MIPS_KSEG0_START);
468	vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
469	vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
470	tmp0 = *vp0;
471	while (vp < (int *)MIPS_MAX_MEM_ADDR) {
472		tmp = *vp;
473		*vp  = PATTERN1;
474		*vp0 = PATTERN2;
475		wbflush();
476		if (*vp != PATTERN1)
477			break;
478		*vp  = PATTERN2;
479		*vp0 = PATTERN1;
480		wbflush();
481		if (*vp != PATTERN2)
482			break;
483		*vp = tmp;
484		vp += PAGE_SIZE/sizeof(int);
485		mem++;
486	}
487	*vp0 = tmp0;
488	return mem;
489}
490
491/*
492 * Console initialization: called early on from main,
493 * before vm init or startup.  Do enough configuration
494 * to choose and initialize a console.
495 */
496
497static void
498null_cnprobe(struct consdev *cn)
499{
500}
501
502static void
503prom_cninit(struct consdev *cn)
504{
505	extern const struct cdevsw cons_cdevsw;
506
507	cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0);
508	cn->cn_pri = CN_REMOTE;
509}
510
511static int
512prom_cngetc(dev_t dev)
513{
514	return MIPS_PROM(getchar)();
515}
516
517static void
518prom_cnputc(dev_t dev, int c)
519{
520	MIPS_PROM(putchar)(c);
521}
522
523static void
524null_cnpollc(dev_t dev, int on)
525{
526}
527
528void
529consinit(void)
530{
531
532	cn_tab = &consdev_zs;
533
534	(*cn_tab->cn_init)(cn_tab);
535}
536