machdep.c revision 1.27 
1/*	$NetBSD: machdep.c,v 1.27 2001/03/15 06:10:38 chs 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 "opt_ddb.h"
29#include "opt_execfmt.h"
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/map.h>
35#include <sys/proc.h>
36#include <sys/buf.h>
37#include <sys/reboot.h>
38#include <sys/conf.h>
39#include <sys/file.h>
40#include <sys/malloc.h>
41#include <sys/mbuf.h>
42#include <sys/msgbuf.h>
43#include <sys/device.h>
44#include <sys/user.h>
45#include <sys/exec.h>
46#include <uvm/uvm_extern.h>
47#include <sys/sysctl.h>
48#include <sys/mount.h>
49#include <sys/syscallargs.h>
50#include <sys/kcore.h>
51#include <sys/boot_flag.h>
52
53#include <machine/cpu.h>
54#include <machine/reg.h>
55#include <machine/psl.h>
56#include <machine/pte.h>
57#include <machine/autoconf.h>
58#include <machine/intr.h>
59#include <mips/locore.h>
60
61#include <machine/nvram.h>
62#include <machine/leds.h>
63
64#ifdef DDB
65#include <machine/db_machdep.h>
66#include <ddb/db_access.h>
67#include <ddb/db_sym.h>
68#include <ddb/db_extern.h>
69#ifndef DB_ELFSIZE
70#error Must define DB_ELFSIZE!
71#endif
72#define ELFSIZE		DB_ELFSIZE
73#include <sys/exec_elf.h>
74#endif
75
76#include <dev/cons.h>
77
78/* For sysctl. */
79char machine[] = MACHINE;
80char machine_arch[] = MACHINE_ARCH;
81char cpu_model[] = "Cobalt Microserver";
82
83/* Our exported CPU info; we can have only one. */
84struct cpu_info cpu_info_store;
85
86/* Maps for VM objects. */
87vm_map_t exec_map = NULL;
88vm_map_t mb_map = NULL;
89vm_map_t phys_map = NULL;
90
91int	physmem;		/* Total physical memory */
92
93char	bootstring[512];	/* Boot command */
94int	netboot;		/* Are we netbooting? */
95
96phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
97int mem_cluster_cnt;
98
99void	configure(void);
100void	mach_init(unsigned int);
101
102/*
103 * safepri is a safe priority for sleep to set for a spin-wait during
104 * autoconfiguration or after a panic.  Used as an argument to splx().
105 */
106int	safepri = MIPS1_PSL_LOWIPL;
107
108extern caddr_t esym;
109extern struct user *proc0paddr;
110
111/*
112 * Do all the stuff that locore normally does before calling main().
113 */
114void
115mach_init(memsize)
116	unsigned int memsize;
117{
118	caddr_t kernend, v;
119        u_long first, last;
120	vsize_t size;
121	extern char edata[], end[];
122	int i;
123
124	/*
125	 * Clear the BSS segment.
126	 */
127#ifdef DDB
128	if (memcmp(((Elf_Ehdr *)end)->e_ident, ELFMAG, SELFMAG) == 0 &&
129	    ((Elf_Ehdr *)end)->e_ident[EI_CLASS] == ELFCLASS) {
130		esym = end;
131		esym += ((Elf_Ehdr *)end)->e_entry;
132		kernend = (caddr_t)mips_round_page(esym);
133		bzero(edata, end - edata);
134	} else
135#endif
136	{
137		kernend = (caddr_t)mips_round_page(end);
138		memset(edata, 0, kernend - edata);
139	}
140
141	physmem = btoc(memsize - MIPS_KSEG0_START);
142
143	consinit();
144
145	uvm_setpagesize();
146
147	/*
148	 * Copy exception-dispatch code down to exception vector.
149	 * Initialize locore-function vector.
150	 * Clear out the I and D caches.
151	 */
152	mips_vector_init();
153
154	/*
155	 * The boot command is passed in the top 512 bytes,
156	 * so don't clobber that.
157	 */
158	mem_clusters[0].start = 0;
159	mem_clusters[0].size = ctob(physmem) - 512;
160	mem_cluster_cnt = 1;
161
162	memcpy(bootstring, (char *)(memsize - 512), 512);
163	memset((char *)(memsize - 512), 0, 512);
164	bootstring[511] = '\0';
165
166	for (i = 0; i < 512; i++) {
167		switch (bootstring[i]) {
168		case '\0':
169			break;
170		case ' ':
171			continue;
172		case '-':
173			while (bootstring[i] != ' ' && bootstring[i] != '\0') {
174				BOOT_FLAG(bootstring[i], boothowto);
175				i++;
176			}
177		}
178		if (memcmp("single", bootstring + i, 5) == 0)
179			boothowto |= RB_SINGLE;
180		if (memcmp("nfsroot=", bootstring + i, 8) == 0)
181			netboot = 1;
182		/*
183		 * XXX Select root device from 'root=/dev/hd[abcd][1234]' too.
184		 */
185	}
186
187#ifdef DDB
188	if (boothowto & RB_KDB)
189		Debugger();
190#endif
191
192	/*
193	 * Load the rest of the available pages into the VM system.
194	 */
195	first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
196	last = mem_clusters[0].start + mem_clusters[0].size;
197	uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
198		VM_FREELIST_DEFAULT);
199
200	/*
201	 * Initialize error message buffer (at end of core).
202	 */
203	mips_init_msgbuf();
204
205	/*
206	 * Allocate space for proc0's USPACE.
207	 */
208	v = (caddr_t)pmap_steal_memory(USPACE, NULL, NULL);
209	proc0.p_addr = proc0paddr = (struct user *)v;
210	proc0.p_md.md_regs = (struct frame *)(v + USPACE) - 1;
211	curpcb = &proc0.p_addr->u_pcb;
212	curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */
213
214	/*
215	 * Allocate space for system data structures.  These data structures
216	 * are allocated here instead of cpu_startup() because physical
217	 * memory is directly addressable.  We don't have to map these into
218	 * virtual address space.
219	 */
220	size = (vsize_t)allocsys(NULL, NULL);
221	v = (caddr_t)pmap_steal_memory(size, NULL, NULL);
222	if ((allocsys(v, NULL) - v) != size)
223		panic("mach_init: table size inconsistency");
224
225	pmap_bootstrap();
226}
227
228/*
229 * Allocate memory for variable-sized tables,
230 */
231void
232cpu_startup()
233{
234	unsigned i;
235	int base, residual;
236	vaddr_t minaddr, maxaddr;
237	vsize_t size;
238	char pbuf[9];
239
240	/*
241	 * Good {morning,afternoon,evening,night}.
242	 */
243	printf(version);
244	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
245	printf("%s memory", pbuf);
246
247	/*
248	 * Allocate virtual address space for file I/O buffers.
249	 * Note they are different than the array of headers, 'buf',
250	 * and usually occupy more virtual memory than physical.
251	 */
252	size = MAXBSIZE * nbuf;
253	if (uvm_map(kernel_map, (vaddr_t *)&buffers, round_page(size),
254		    NULL, UVM_UNKNOWN_OFFSET, 0,
255		    UVM_MAPFLAG(UVM_PROT_NONE, UVM_PROT_NONE, UVM_INH_NONE,
256		    UVM_ADV_NORMAL, 0)) != 0)
257		panic("startup: cannot allocate VM for buffers");
258	minaddr = (vaddr_t)buffers;
259	base = bufpages / nbuf;
260	residual = bufpages % nbuf;
261	for (i = 0; i < nbuf; i++) {
262		vsize_t curbufsize;
263		vaddr_t curbuf;
264		struct vm_page *pg;
265
266		/*
267		 * Each buffer has MAXBSIZE bytes of VM space allocated.  Of
268		 * that MAXBSIZE space, we allocate and map (base+1) pages
269		 * for the first "residual" buffers, and then we allocate
270		 * "base" pages for the rest.
271		 */
272		curbuf = (vaddr_t) buffers + (i * MAXBSIZE);
273		curbufsize = NBPG * ((i < residual) ? (base + 1) : base);
274
275		while (curbufsize) {
276			pg = uvm_pagealloc(NULL, 0, NULL, 0);
277			if (pg == NULL)
278				panic("cpu_startup: not enough memory for "
279					"buffer cache");
280			pmap_kenter_pa(curbuf, VM_PAGE_TO_PHYS(pg),
281				       VM_PROT_READ|VM_PROT_WRITE);
282			curbuf += PAGE_SIZE;
283			curbufsize -= PAGE_SIZE;
284		}
285	}
286
287	/*
288	 * Allocate a submap for exec arguments.  This map effectively
289	 * limits the number of processes exec'ing at any time.
290	 */
291	exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
292				    16 * NCARGS, VM_MAP_PAGEABLE, FALSE, NULL);
293	/*
294	 * Allocate a submap for physio.
295	 */
296	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
297				    VM_PHYS_SIZE, 0, FALSE, NULL);
298
299	/*
300	 * (No need to allocate an mbuf cluster submap.  Mbuf clusters
301	 * are allocated via the pool allocator, and we use KSEG to
302	 * map those pages.)
303	 */
304
305	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
306	printf(", %s free", pbuf);
307	format_bytes(pbuf, sizeof(pbuf), bufpages * NBPG);
308	printf(", %s in %d buffers\n", pbuf, nbuf);
309
310	/*
311	 * Set up buffers, so they can be used to read disk labels.
312	 */
313	bufinit();
314}
315
316int
317cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
318	int *name;
319	u_int namelen;
320	void *oldp;
321	size_t *oldlenp;
322	void *newp;
323	size_t newlen;
324	struct proc *p;
325{
326	/* All sysctl names at this level are terminal. */
327	if (namelen != 1)
328		return ENOTDIR;
329
330	switch (name[0]) {
331	default:
332		return EOPNOTSUPP;
333	}
334}
335
336int	waittime = -1;
337
338void
339cpu_reboot(howto, bootstr)
340	int howto;
341	char *bootstr;
342{
343	/* Take a snapshot before clobbering any registers. */
344	if (curproc)
345		savectx((struct user *)curpcb);
346
347	if (cold) {
348		howto |= RB_HALT;
349		goto haltsys;
350	}
351
352	/* If "always halt" was specified as a boot flag, obey. */
353	if (boothowto & RB_HALT)
354		howto |= RB_HALT;
355
356	boothowto = howto;
357	if ((howto & RB_NOSYNC) == 0 && (waittime < 0)) {
358		waittime = 0;
359		vfs_shutdown();
360
361		/*
362		 * If we've been adjusting the clock, the todr
363		 * will be out of synch; adjust it now.
364		 */
365		resettodr();
366	}
367
368	splhigh();
369
370	if (howto & RB_DUMP)
371		dumpsys();
372
373haltsys:
374	doshutdownhooks();
375
376	if (howto & RB_HALT) {
377		printf("\n");
378		printf("The operating system has halted.\n");
379		printf("Please press any key to reboot.\n\n");
380		cnpollc(1);	/* For proper keyboard command handling */
381		cngetc();
382		cnpollc(0);
383	}
384
385	printf("rebooting...\n\n");
386	delay(500000);
387
388	*(volatile char *)MIPS_PHYS_TO_KSEG1(LED_ADDR) = LED_RESET;
389	printf("WARNING: reboot failed!\n");
390
391	for (;;);
392}
393
394void
395microtime(tvp)
396	struct timeval *tvp;
397{
398	int s = splclock();
399	static struct timeval lasttime;
400	u_int32_t counter0;
401
402	*tvp = time;
403
404	counter0 = *(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x14000850);
405
406	/*
407	 * XXX
408	 */
409
410	counter0 /= 50;
411	counter0 %= 10000;
412
413	if (counter0 > 9999) {
414		counter0 = 9999;
415	}
416
417	tvp->tv_usec -= tvp->tv_usec % 10000;
418	tvp->tv_usec += 10000 - counter0;
419
420	lasttime = *tvp;
421	splx(s);
422}
423
424unsigned long cpuspeed;
425
426__inline void
427delay(n)
428	unsigned long n;
429{
430	volatile register long N = cpuspeed * n;
431
432	while (--N > 0);
433}
434
435#define NINTR	6
436
437static struct {
438	int (*func)(void *);
439	void *arg;
440} intrtab[NINTR];
441
442void *
443cpu_intr_establish(level, ipl, func, arg)
444	int level;
445	int ipl;
446	int (*func)(void *);
447	void *arg;
448{
449	if (level < 0 || level >= NINTR)
450		panic("invalid interrupt level");
451
452	if (intrtab[level].func != NULL)
453		panic("cannot share CPU interrupts");
454
455	intrtab[level].func = func;
456	intrtab[level].arg = arg;
457
458	return (void *)-1;
459}
460
461void
462cpu_intr(status, cause, pc, ipending)
463	u_int32_t status;
464	u_int32_t cause;
465	u_int32_t pc;
466	u_int32_t ipending;
467{
468	struct clockframe cf;
469	static u_int32_t cycles;
470	int i;
471
472	uvmexp.intrs++;
473
474	if (ipending & MIPS_INT_MASK_0) {
475		volatile u_int32_t *irq_src =
476				(u_int32_t *)MIPS_PHYS_TO_KSEG1(0x14000c18);
477
478		if (*irq_src & 0x00000100) {
479			*irq_src = 0;
480
481			cf.pc = pc;
482			cf.sr = status;
483
484			hardclock(&cf);
485		}
486		cause &= ~MIPS_INT_MASK_0;
487	}
488
489	for (i = 0; i < 5; i++) {
490		if (ipending & (MIPS_INT_MASK_0 << i))
491			if (intrtab[i].func != NULL)
492				if ((*intrtab[i].func)(intrtab[i].arg))
493					cause &= ~(MIPS_INT_MASK_0 << i);
494	}
495
496	if (ipending & MIPS_INT_MASK_5) {
497		cycles = mips3_cp0_count_read();
498		mips3_cp0_compare_write(cycles + 1250000);	/* XXX */
499
500#if 0
501		cf.pc = pc;
502		cf.sr = status;
503
504		statclock(&cf);
505#endif
506		cause &= ~MIPS_INT_MASK_5;
507	}
508
509	_splset((status & ~cause & MIPS_HARD_INT_MASK) | MIPS_SR_INT_IE);
510
511	/* 'softnet' interrupt */
512	if (ipending & MIPS_SOFT_INT_MASK_1) {
513		clearsoftnet();
514		uvmexp.softs++;
515		netintr();
516	}
517
518	/* 'softclock' interrupt */
519	if (ipending & MIPS_SOFT_INT_MASK_0) {
520		clearsoftclock();
521		uvmexp.softs++;
522		intrcnt[SOFTCLOCK_INTR]++;
523		softclock(NULL);
524	}
525}
526