machdep.c revision 1.52 
1/*	$NetBSD: machdep.c,v 1.52 2004/08/28 12:32:48 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.52 2004/08/28 12:32:48 tsutsui Exp $");
30
31#include "opt_ddb.h"
32#include "opt_kgdb.h"
33#include "opt_execfmt.h"
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/proc.h>
39#include <sys/buf.h>
40#include <sys/reboot.h>
41#include <sys/conf.h>
42#include <sys/file.h>
43#include <sys/malloc.h>
44#include <sys/mbuf.h>
45#include <sys/msgbuf.h>
46#include <sys/device.h>
47#include <sys/user.h>
48#include <sys/exec.h>
49#include <uvm/uvm_extern.h>
50#include <sys/sysctl.h>
51#include <sys/mount.h>
52#include <sys/sa.h>
53#include <sys/syscallargs.h>
54#include <sys/kcore.h>
55#include <sys/boot_flag.h>
56#include <sys/ksyms.h>
57
58#include <machine/cpu.h>
59#include <machine/reg.h>
60#include <machine/psl.h>
61#include <machine/pte.h>
62#include <machine/autoconf.h>
63#include <machine/bootinfo.h>
64#include <machine/intr.h>
65#include <mips/locore.h>
66
67#include <machine/nvram.h>
68#include <machine/leds.h>
69
70#include <dev/cons.h>
71
72#ifdef KGDB
73#include <sys/kgdb.h>
74#endif
75
76#include "ksyms.h"
77
78#if NKSYMS || defined(DDB) || defined(LKM)
79#include <machine/db_machdep.h>
80#include <ddb/db_extern.h>
81#define ELFSIZE		DB_ELFSIZE
82#include <sys/exec_elf.h>
83#endif
84
85/* For sysctl. */
86extern char cpu_model[];
87
88/* Our exported CPU info; we can have only one. */
89struct cpu_info cpu_info_store;
90
91/* Maps for VM objects. */
92struct vm_map *exec_map = NULL;
93struct vm_map *mb_map = NULL;
94struct vm_map *phys_map = NULL;
95
96int	physmem;		/* Total physical memory */
97char	*bootinfo = NULL;	/* pointer to bootinfo structure */
98
99char	bootstring[512];	/* Boot command */
100int	netboot;		/* Are we netbooting? */
101
102char *	nfsroot_bstr = NULL;
103char *	root_bstr = NULL;
104int	bootunit = -1;
105int	bootpart = -1;
106
107
108phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
109int mem_cluster_cnt;
110
111void	mach_init(unsigned int, u_int, char*);
112void	decode_bootstring(void);
113static char *	strtok_light(char *, const char);
114
115/*
116 * safepri is a safe priority for sleep to set for a spin-wait during
117 * autoconfiguration or after a panic.  Used as an argument to splx().
118 */
119int	safepri = MIPS1_PSL_LOWIPL;
120
121extern caddr_t esym;
122extern struct user *proc0paddr;
123
124
125
126/*
127 * Do all the stuff that locore normally does before calling main().
128 */
129void
130mach_init(memsize, bim, bip)
131	unsigned int memsize;
132	u_int  bim;
133	char   *bip;
134{
135	caddr_t kernend, v;
136	u_long first, last;
137	extern char edata[], end[];
138	char *bi_msg;
139#if NKSYMS || defined(DDB) || defined(LKM)
140	int nsym = 0;
141	caddr_t ssym = 0;
142	caddr_t esym = 0;
143	struct btinfo_symtab *bi_syms;
144#endif
145
146	/*
147	 * Clear the BSS segment.
148	 */
149#if NKSYMS || defined(DDB) || defined(LKM)
150	if (memcmp(((Elf_Ehdr *)end)->e_ident, ELFMAG, SELFMAG) == 0 &&
151	    ((Elf_Ehdr *)end)->e_ident[EI_CLASS] == ELFCLASS) {
152		esym = end;
153		esym += ((Elf_Ehdr *)end)->e_entry;
154		kernend = (caddr_t)mips_round_page(esym);
155		memset(edata, 0, end - edata);
156	} else
157#endif
158	{
159		kernend = (caddr_t)mips_round_page(end);
160		memset(edata, 0, kernend - edata);
161	}
162
163	/* Check for valid bootinfo passed from bootstrap */
164	if (bim == BOOTINFO_MAGIC) {
165		struct btinfo_magic *bi_magic;
166
167		bootinfo = bip;
168		bi_magic = lookup_bootinfo(BTINFO_MAGIC);
169		if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC)
170			bi_msg = "invalid bootinfo structure.\n";
171		else
172			bi_msg = NULL;
173	} else
174		bi_msg = "invalid bootinfo (standalone boot?)\n";
175
176#if NKSYMS || defined(DDB) || defined(LKM)
177	bi_syms = lookup_bootinfo(BTINFO_SYMTAB);
178
179	/* Load symbol table if present */
180	if (bi_syms != NULL) {
181		nsym = bi_syms->nsym;
182		ssym = (caddr_t)bi_syms->ssym;
183		esym = (caddr_t)bi_syms->esym;
184		kernend = (caddr_t)mips_round_page(esym);
185	}
186#endif
187
188	physmem = btoc(memsize - MIPS_KSEG0_START);
189
190	consinit();
191
192	if (bi_msg != NULL)
193		printf(bi_msg);
194
195	uvm_setpagesize();
196
197	/*
198	 * Copy exception-dispatch code down to exception vector.
199	 * Initialize locore-function vector.
200	 * Clear out the I and D caches.
201	 */
202	mips_vector_init();
203
204	/*
205	 * The boot command is passed in the top 512 bytes,
206	 * so don't clobber that.
207	 */
208	mem_clusters[0].start = 0;
209	mem_clusters[0].size = ctob(physmem) - 512;
210	mem_cluster_cnt = 1;
211
212	memcpy(bootstring, (char *)(memsize - 512), 512);
213	memset((char *)(memsize - 512), 0, 512);
214	bootstring[511] = '\0';
215
216	decode_bootstring();
217
218#if NKSYMS || defined(DDB) || defined(LKM)
219	/* init symbols if present */
220	if ((bi_syms != NULL) && (esym != NULL))
221		ksyms_init(esym - ssym, ssym, esym);
222	else
223		ksyms_init(0, NULL, NULL);
224#endif
225#ifdef DDB
226	if (boothowto & RB_KDB)
227		Debugger();
228#endif
229#ifdef KGDB
230	if (boothowto & RB_KDB)
231		kgdb_connect(0);
232#endif
233
234	strcpy(cpu_model, "Cobalt Microserver");
235
236	/*
237	 * Load the rest of the available pages into the VM system.
238	 */
239	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
240	last = mem_clusters[0].start + mem_clusters[0].size;
241	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
242		VM_FREELIST_DEFAULT);
243
244	/*
245	 * Initialize error message buffer (at end of core).
246	 */
247	mips_init_msgbuf();
248
249	pmap_bootstrap();
250
251	/*
252	 * Allocate space for proc0's USPACE.
253	 */
254	v = (caddr_t)uvm_pageboot_alloc(USPACE);
255	lwp0.l_addr = proc0paddr = (struct user *)v;
256	lwp0.l_md.md_regs = (struct frame *)(v + USPACE) - 1;
257	curpcb = &lwp0.l_addr->u_pcb;
258	curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */
259}
260
261/*
262 * Allocate memory for variable-sized tables,
263 */
264void
265cpu_startup()
266{
267	vaddr_t minaddr, maxaddr;
268	char pbuf[9];
269
270	/*
271	 * Good {morning,afternoon,evening,night}.
272	 */
273	printf(version);
274	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
275	printf("total memory = %s\n", pbuf);
276
277	minaddr = 0;
278	/*
279	 * Allocate a submap for exec arguments.  This map effectively
280	 * limits the number of processes exec'ing at any time.
281	 */
282	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
283				    16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);
284	/*
285	 * Allocate a submap for physio.
286	 */
287	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
288				    VM_PHYS_SIZE, 0, FALSE, NULL);
289
290	/*
291	 * (No need to allocate an mbuf cluster submap.  Mbuf clusters
292	 * are allocated via the pool allocator, and we use KSEG to
293	 * map those pages.)
294	 */
295
296	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
297	printf("avail memory = %s\n", pbuf);
298}
299
300int	waittime = -1;
301
302void
303cpu_reboot(howto, bootstr)
304	int howto;
305	char *bootstr;
306{
307	/* Take a snapshot before clobbering any registers. */
308	if (curlwp)
309		savectx((struct user *)curpcb);
310
311	if (cold) {
312		howto |= RB_HALT;
313		goto haltsys;
314	}
315
316	/* If "always halt" was specified as a boot flag, obey. */
317	if (boothowto & RB_HALT)
318		howto |= RB_HALT;
319
320	boothowto = howto;
321	if ((howto & RB_NOSYNC) == 0 && (waittime < 0)) {
322		waittime = 0;
323		vfs_shutdown();
324
325		/*
326		 * If we've been adjusting the clock, the todr
327		 * will be out of synch; adjust it now.
328		 */
329		resettodr();
330	}
331
332	splhigh();
333
334	if (howto & RB_DUMP)
335		dumpsys();
336
337haltsys:
338	doshutdownhooks();
339
340	if (howto & RB_HALT) {
341		printf("\n");
342		printf("The operating system has halted.\n");
343		printf("Please press any key to reboot.\n\n");
344		cnpollc(1);	/* For proper keyboard command handling */
345		cngetc();
346		cnpollc(0);
347	}
348
349	printf("rebooting...\n\n");
350	delay(500000);
351
352	*(volatile char *)MIPS_PHYS_TO_KSEG1(LED_ADDR) = LED_RESET;
353	printf("WARNING: reboot failed!\n");
354
355	for (;;);
356}
357
358unsigned long cpuspeed;
359
360__inline void
361delay(n)
362	unsigned long n;
363{
364	volatile register long N = cpuspeed * n;
365
366	while (--N > 0);
367}
368
369#define NINTR	6
370
371static struct cobalt_intrhand intrtab[NINTR];
372
373const u_int32_t mips_ipl_si_to_sr[_IPL_NSOFT] = {
374	MIPS_SOFT_INT_MASK_0,			/* IPL_SOFT */
375	MIPS_SOFT_INT_MASK_0,			/* IPL_SOFTCLOCK */
376	MIPS_SOFT_INT_MASK_1,			/* IPL_SOFTNET */
377	MIPS_SOFT_INT_MASK_1,			/* IPL_SOFTSERIAL */
378};
379
380void *
381cpu_intr_establish(level, ipl, func, arg)
382	int level;
383	int ipl;
384	int (*func)(void *);
385	void *arg;
386{
387	if (level < 0 || level >= NINTR)
388		panic("invalid interrupt level");
389
390	if (intrtab[level].ih_func != NULL)
391		panic("cannot share CPU interrupts");
392
393	intrtab[level].cookie_type = COBALT_COOKIE_TYPE_CPU;
394	intrtab[level].ih_func = func;
395	intrtab[level].ih_arg = arg;
396
397	return &intrtab[level];
398}
399
400void
401cpu_intr_disestablish(cookie)
402	void *cookie;
403{
404	struct cobalt_intrhand *ih = cookie;
405
406	if (ih->cookie_type == COBALT_COOKIE_TYPE_CPU) {
407		ih->ih_func = NULL;
408		ih->ih_arg = NULL;
409	}
410}
411
412void
413cpu_intr(status, cause, pc, ipending)
414	u_int32_t status;
415	u_int32_t cause;
416	u_int32_t pc;
417	u_int32_t ipending;
418{
419	struct clockframe cf;
420	static u_int32_t cycles;
421	int i;
422
423	uvmexp.intrs++;
424
425	if (ipending & MIPS_INT_MASK_0) {
426		volatile u_int32_t *irq_src =
427				(u_int32_t *)MIPS_PHYS_TO_KSEG1(0x14000c18);
428
429		if (*irq_src & 0x00000100) {
430			*irq_src = 0;
431
432			cf.pc = pc;
433			cf.sr = status;
434
435			hardclock(&cf);
436		}
437		cause &= ~MIPS_INT_MASK_0;
438	}
439
440	for (i = 0; i < 5; i++) {
441		if (ipending & (MIPS_INT_MASK_0 << i))
442			if (intrtab[i].ih_func != NULL)
443				if ((*intrtab[i].ih_func)(intrtab[i].ih_arg))
444					cause &= ~(MIPS_INT_MASK_0 << i);
445	}
446
447	if (ipending & MIPS_INT_MASK_5) {
448		cycles = mips3_cp0_count_read();
449		mips3_cp0_compare_write(cycles + 1250000);	/* XXX */
450
451#if 0
452		cf.pc = pc;
453		cf.sr = status;
454
455		statclock(&cf);
456#endif
457		cause &= ~MIPS_INT_MASK_5;
458	}
459
460	_splset((status & ~cause & MIPS_HARD_INT_MASK) | MIPS_SR_INT_IE);
461
462	/* software interrupt */
463	ipending &= (MIPS_SOFT_INT_MASK_1|MIPS_SOFT_INT_MASK_0);
464	if (ipending == 0)
465		return;
466
467	_clrsoftintr(ipending);
468
469	softintr_dispatch(ipending);
470}
471
472
473void
474decode_bootstring(void)
475{
476	char * work;
477	char * equ;
478	int i;
479
480	/* break apart bootstring on ' ' boundries  and itterate*/
481	work = strtok_light(bootstring, ' ');
482	while (work != '\0') {
483		/* if starts with '-', we got options, walk its decode */
484		if (work[0] == '-') {
485			i = 1;
486			while (work[i] != ' ' && work[i] != '\0') {
487				BOOT_FLAG(work[i], boothowto);
488				i++;
489			}
490		} else
491
492		/* if it has a '=' its an assignment, switch and set */
493		if ((equ = strchr(work,'=')) != '\0') {
494			if(0 == memcmp("nfsroot=", work, 8)) {
495				nfsroot_bstr = (equ +1);
496			} else
497			if(0 == memcmp("root=", work, 5)) {
498				root_bstr = (equ +1);
499			}
500		} else
501
502		/* else it a single value, switch and process */
503		if (memcmp("single", work, 5) == 0) {
504			boothowto |= RB_SINGLE;
505		} else
506		if (memcmp("ro", work, 2) == 0) {
507			/* this is also inserted by the firmware */
508		}
509
510		/* grab next token */
511		work = strtok_light(NULL, ' ');
512	}
513
514	if (root_bstr != NULL) {
515		/* this should be of the form "/dev/hda1" */
516		/* [abcd][1234]    drive partition  linux probe order */
517		if ((memcmp("/dev/hd",root_bstr,7) == 0) &&
518		    (strlen(root_bstr) == 9) ){
519			bootunit = root_bstr[7] - 'a';
520			bootpart = root_bstr[8] - '1';
521		}
522	}
523}
524
525
526static char *
527strtok_light(str, sep)
528	char * str;
529	const char sep;
530{
531	static char * proc;
532	char * head;
533	char * work;
534
535	if (str != NULL)
536		proc = str;
537	if (proc == NULL)  /* end of string return NULL */
538		return proc;
539
540	head = proc;
541
542	work = strchr (proc, sep);
543	if (work == NULL) {  /* we hit the end */
544		proc = work;
545	} else {
546		proc = (work +1 );
547		*work = '\0';
548	}
549
550	return head;
551}
552
553/*
554 * Look up information in bootinfo of boot loader.
555 */
556void *
557lookup_bootinfo(type)
558	int type;
559{
560	struct btinfo_common *bt;
561	char *help = bootinfo;
562
563	/* Check for a bootinfo record first. */
564	if (help == NULL) {
565		printf("##### help == NULL\n");
566		return (NULL);
567	}
568
569	do {
570		bt = (struct btinfo_common *)help;
571		printf("Type %d @0x%x\n", bt->type, (u_int)bt);
572		if (bt->type == type)
573			return ((void *)help);
574		help += bt->next;
575	} while (bt->next != 0 &&
576		(size_t)help < (size_t)bootinfo + BOOTINFO_SIZE);
577
578	return (NULL);
579}
580