1/*	$NetBSD: ibm4xx_machdep.c,v 1.39 2024/03/05 14:15:34 thorpej Exp $	*/
2/*	Original: ibm40x_machdep.c,v 1.3 2005/01/17 17:19:36 shige Exp $ */
3
4/*
5 * Copyright 2001, 2002 Wasabi Systems, Inc.
6 * All rights reserved.
7 *
8 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *      This product includes software developed for the NetBSD Project by
21 *      Wasabi Systems, Inc.
22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
23 *    or promote products derived from this software without specific prior
24 *    written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39/*
40 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
41 * Copyright (C) 1995, 1996 TooLs GmbH.
42 * All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 *    notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 *    notice, this list of conditions and the following disclaimer in the
51 *    documentation and/or other materials provided with the distribution.
52 * 3. All advertising materials mentioning features or use of this software
53 *    must display the following acknowledgement:
54 *	This product includes software developed by TooLs GmbH.
55 * 4. The name of TooLs GmbH may not be used to endorse or promote products
56 *    derived from this software without specific prior written permission.
57 *
58 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
59 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
60 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
61 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
62 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
63 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
64 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
65 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
66 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
67 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
68 */
69
70#include <sys/cdefs.h>
71__KERNEL_RCSID(0, "$NetBSD: ibm4xx_machdep.c,v 1.39 2024/03/05 14:15:34 thorpej Exp $");
72
73#include "ksyms.h"
74
75#ifdef _KERNEL_OPT
76#include "opt_ddb.h"
77#include "opt_kgdb.h"
78#include "opt_modular.h"
79#endif
80
81#include <sys/param.h>
82#include <sys/cpu.h>
83#include <sys/ksyms.h>
84#include <sys/mount.h>
85#include <sys/msgbuf.h>
86#include <sys/pmf.h>
87#include <sys/proc.h>
88#include <sys/reboot.h>
89#include <sys/systm.h>
90
91#include <dev/cons.h>
92
93#include <uvm/uvm_extern.h>
94
95#if defined(DDB)
96#include <machine/db_machdep.h>
97#include <ddb/db_extern.h>
98#endif
99
100#if defined(KGDB)
101#include <sys/kgdb.h>
102#endif
103
104#include <machine/powerpc.h>
105#include <machine/trap.h>
106
107#include <powerpc/pcb.h>
108#include <powerpc/spr.h>
109
110#include <powerpc/ibm4xx/cpu.h>
111#include <powerpc/ibm4xx/spr.h>
112
113/*
114 * Global variables used here and there
115 */
116paddr_t msgbuf_paddr;
117vaddr_t msgbuf_vaddr;
118char msgbuf[MSGBUFSIZE];
119
120#if NKSYMS || defined(DDB) || defined(MODULAR)
121void *startsym, *endsym;
122#endif
123
124#ifdef MODULAR
125register_t cpu_psluserset = PSL_USERSET;
126register_t cpu_pslusermod = PSL_USERMOD;
127register_t cpu_pslusermask = PSL_USERMASK;
128#endif
129
130/*
131 * Trap vectors
132 */
133extern const uint32_t defaulttrap[], defaultsize;
134extern const uint32_t sctrap[], scsize;
135extern const uint32_t accesstrap[], accesssize;
136extern const uint32_t criticaltrap[], criticalsize;
137extern const uint32_t tlbimiss4xx[], tlbim4size;
138extern const uint32_t tlbdmiss4xx[], tlbdm4size;
139extern const uint32_t pitfitwdog[], pitfitwdogsize;
140extern const uint32_t errata51handler[], errata51size;
141#if defined(DDB)
142extern const uint32_t ddblow[], ddbsize;
143#endif
144static const struct exc_info trap_table[] = {
145	{ EXC_SC,	sctrap,		(uintptr_t)&scsize },
146	{ EXC_ALI,	accesstrap,	(uintptr_t)&accesssize },
147	{ EXC_DSI,	accesstrap,	(uintptr_t)&accesssize },
148	{ EXC_MCHK,	criticaltrap,	(uintptr_t)&criticalsize },
149	{ EXC_ITMISS,	tlbimiss4xx,	(uintptr_t)&tlbim4size },
150	{ EXC_DTMISS,	tlbdmiss4xx,	(uintptr_t)&tlbdm4size },
151	{ EXC_PIT,	pitfitwdog,	(uintptr_t)&pitfitwdogsize },
152	{ EXC_DEBUG,	criticaltrap,	(uintptr_t)&criticalsize },
153	{ (EXC_DTMISS|EXC_ALI),
154			errata51handler, (uintptr_t)&errata51size },
155#if defined(DDB)
156	{ EXC_PGM,	ddblow,		(uintptr_t)&ddbsize },
157#else
158	{ EXC_PGM,	accesstrap,	(uintptr_t)&accesssize },
159#endif
160};
161
162void
163cpu_reboot(int howto, char *what)
164{
165	static int syncing;
166	static char str[256];
167	char *ap = str, *ap1 = ap;
168
169	boothowto = howto;
170	if (!cold && !(howto & RB_NOSYNC) && !syncing) {
171		syncing = 1;
172		vfs_shutdown();		/* sync */
173	}
174
175	splhigh();
176
177	if (!cold && (howto & RB_DUMP))
178		ibm4xx_dumpsys();
179
180	doshutdownhooks();
181
182	pmf_system_shutdown(boothowto);
183
184	if ((howto & RB_POWERDOWN) == RB_POWERDOWN) {
185		/* Power off here if we know how... */
186	}
187
188	if (howto & RB_HALT) {
189		printf("The operating system has halted.\n"
190		    "Press any key to reboot.\n\n");
191
192		cnpollc(1);
193		cngetc();
194		cnpollc(0);
195	}
196
197	printf("rebooting...\n\n");
198	if (what && *what) {
199		if (strlen(what) > sizeof(str) - 5)
200			printf("boot string too large, ignored\n");
201		else {
202			strcpy(str, what);
203			ap1 = ap = str + strlen(str);
204			*ap++ = ' ';
205		}
206	}
207	*ap++ = '-';
208	if (howto & RB_SINGLE)
209		*ap++ = 's';
210	if (howto & RB_KDB)
211		*ap++ = 'd';
212	*ap++ = '\0';
213	if (ap[-2] == '-')
214		*ap1 = '\0';
215
216	/* flush cache for msgbuf */
217	__syncicache((void *)msgbuf_paddr, round_page(MSGBUFSIZE));
218
219	ppc4xx_reset();
220
221	printf("ppc4xx_reset() failed!\n");
222
223	for (;;) {
224#if defined(DDB)
225		Debugger();
226#elif defined(KGDB)
227		kgdb_connect(1);
228#else
229		continue;
230#endif
231	}
232}
233
234/*
235 * Install a trap vector. We cannot use memcpy because the
236 * destination may be zero.
237 */
238static void
239trap_copy(const uint32_t *src, vaddr_t dest, size_t len)
240{
241	uint32_t *dest_p = (void *)dest;
242
243	while (len > 0) {
244		*dest_p++ = *src++;
245		len -= sizeof(uint32_t);
246	}
247}
248
249/*
250 * ibm4xx_init:
251 */
252void
253ibm4xx_init(vaddr_t startkernel, vaddr_t endkernel, void (*handler)(void))
254{
255	/* Initialize cache info for memcpy, etc. */
256	cpu_probe_cache();
257
258	/*
259	 * Initialize current pcb and pmap pointers.
260	 */
261	KASSERT(curcpu() == &cpu_info[0]);
262	KASSERT(lwp0.l_cpu == curcpu());
263	KASSERT(curlwp == &lwp0);
264
265	curpcb = lwp_getpcb(curlwp);
266	memset(curpcb, 0, sizeof(struct pcb));
267
268	curpcb->pcb_pm = pmap_kernel();
269
270	for (uintptr_t exc = EXC_RSVD; exc <= EXC_LAST; exc += 0x100) {
271		trap_copy(defaulttrap, exc, (uintptr_t)&defaultsize);
272	}
273
274	for (size_t i = 0; i < __arraycount(trap_table); i++) {
275		KASSERT(trap_table[i].exc_size <= 0x100);
276		trap_copy(trap_table[i].exc_addr, trap_table[i].exc_vector,
277		    trap_table[i].exc_size);
278	}
279
280	__syncicache((void *)EXC_RST, EXC_LAST - EXC_RST + 0x100);
281
282	mtspr(SPR_EVPR, 0);		/* Set Exception vector base */
283
284	/* Handle trap instruction as PGM exception */
285	mtspr(SPR_DBCR0, mfspr(SPR_DBCR0) & ~DBCR0_TDE);
286
287	/*
288	 * external interrupt handler install
289	 */
290	if (handler)
291		ibm4xx_install_extint(handler);
292
293	/*
294	 * Now enable translation (and machine checks/recoverable interrupts).
295	 */
296	__asm volatile ("mfmsr %0; ori %0,%0,%1; mtmsr %0; isync"
297		      : : "r" (0), "K" (PSL_IR|PSL_DR));
298	/* XXXX PSL_ME - With ME set kernel gets stuck... */
299
300	/*
301	 * turn on console after enable translation
302	 */
303	consinit();
304
305	uvm_md_init();
306
307	/*
308	 * Initialize pmap module.
309	 */
310	pmap_bootstrap(startkernel, endkernel);
311
312	/*
313	 * Let's take all the indirect calls via our stubs and patch
314	 * them to be direct calls.
315	 */
316	cpu_fixup_stubs();
317
318#if NKSYMS || defined(DDB) || defined(MODULAR)
319	ksyms_addsyms_elf((uintptr_t)endsym - (uintptr_t)startsym,
320	    startsym, endsym);
321#endif
322}
323
324void
325ibm4xx_install_extint(void (*handler)(void))
326{
327	extern int extint, extsize;
328	extern u_long extint_call;
329	u_long offset = (u_long)handler - (u_long)&extint_call;
330	int msr;
331
332#ifdef	DIAGNOSTIC
333	if (offset > 0x1ffffff)
334		panic("install_extint: too far away");
335#endif
336	__asm volatile ("mfmsr %0; wrteei 0" : "=r" (msr));
337	extint_call = (extint_call & 0xfc000003) | offset;
338	memcpy((void *)EXC_EXI, &extint, (size_t)&extsize);
339	__syncicache((void *)&extint_call, sizeof extint_call);
340	__syncicache((void *)EXC_EXI, (int)&extsize);
341	__asm volatile ("mtmsr %0" :: "r" (msr));
342}
343
344/*
345 * ibm4xx_cpu_startup:
346 * Machine dependent startup code.
347 */
348void
349ibm4xx_cpu_startup(const char *model)
350{
351	vaddr_t minaddr, maxaddr;
352	char pbuf[9];
353
354	KASSERT(curcpu() != NULL);
355	KASSERT(lwp0.l_cpu != NULL);
356	KASSERT(curcpu()->ci_intstk != 0);
357	KASSERT(curcpu()->ci_idepth == -1);
358
359	/*
360	 * Initialize error message buffer (at end of core).
361	 */
362#if 0	/* For some reason this fails... --Artem
363	 * Besides, do we really have to put it at the end of core?
364	 * Let's use static buffer for now
365	 */
366	if (!(msgbuf_vaddr = uvm_km_alloc(kernel_map, round_page(MSGBUFSIZE),
367	    0, UVM_KMF_VAONLY)))
368		panic("startup: no room for message buffer");
369	for (i = 0; i < btoc(MSGBUFSIZE); i++)
370		pmap_kenter_pa(msgbuf_vaddr + i * PAGE_SIZE,
371		    msgbuf_paddr + i * PAGE_SIZE,
372		    VM_PROT_READ|VM_PROT_WRITE, 0);
373	initmsgbuf((void *)msgbuf_vaddr, round_page(MSGBUFSIZE));
374#else
375	initmsgbuf((void *)msgbuf, round_page(MSGBUFSIZE));
376#endif
377
378	printf("%s%s", copyright, version);
379	if (model != NULL)
380		printf("Model: %s\n", model);
381
382	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
383	printf("total memory = %s\n", pbuf);
384
385	minaddr = 0;
386	/*
387	 * Allocate a submap for physio
388	 */
389	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
390				 VM_PHYS_SIZE, 0, false, NULL);
391
392	/*
393	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
394	 * are allocated via the pool allocator, and we use direct-mapped
395	 * pool pages.
396	 */
397
398	format_bytes(pbuf, sizeof(pbuf), ptoa(uvm_availmem(false)));
399	printf("avail memory = %s\n", pbuf);
400}
401
402/*
403 * ibm4xx_dumpsys:
404 * Crash dump handling.
405 */
406void
407ibm4xx_dumpsys(void)
408{
409
410	printf("dumpsys: TBD\n");
411}
412