1 #include "u.h"
2 #include "tos.h"
3 #include "../port/lib.h"
4 #include "mem.h"
5 #include "dat.h"
6 #include "fns.h"
7
8 #include "init.h"
9 #include <pool.h>
10
11 #include "reboot.h"
12
13 enum {
14 /* space for syscall args, return PC, top-of-stack struct */
15 Ustkheadroom = sizeof(Sargs) + sizeof(uintptr) + sizeof(Tos),
16 };
17
18 /* Firmware compatibility */
19 #define Minfirmrev 326770
20 #define Minfirmdate "19 Aug 2013"
21
22 /*
23 * Where configuration info is left for the loaded programme.
24 */
25 #define BOOTARGS ((char*)CONFADDR)
26 #define BOOTARGSLEN (MACHADDR-CONFADDR)
27 #define MAXCONF 64
28 #define MAXCONFLINE 160
29
30 uintptr kseg0 = KZERO;
31 Mach* machaddr[MAXMACH];
32 Conf conf;
33 ulong memsize = 128*1024*1024;
34
35 /*
36 * Option arguments from the command line.
37 * oargv[0] is the boot file.
38 */
39 static int oargc;
40 static char* oargv[20];
41 static char oargb[128];
42 static int oargblen;
43
44 static uintptr sp; /* XXX - must go - user stack of init proc */
45
46 /* store plan9.ini contents here at least until we stash them in #ec */
47 static char confname[MAXCONF][KNAMELEN];
48 static char confval[MAXCONF][MAXCONFLINE];
49 static int nconf;
50
51 typedef struct Atag Atag;
52 struct Atag {
53 u32int size; /* size of atag in words, including this header */
54 u32int tag; /* atag type */
55 union {
56 u32int data[1]; /* actually [size-2] */
57 /* AtagMem */
58 struct {
59 u32int size;
60 u32int base;
61 } mem;
62 /* AtagCmdLine */
63 char cmdline[1]; /* actually [4*(size-2)] */
64 };
65 };
66
67 enum {
68 AtagNone = 0x00000000,
69 AtagCore = 0x54410001,
70 AtagMem = 0x54410002,
71 AtagCmdline = 0x54410009,
72 };
73
74 static int
findconf(char * name)75 findconf(char *name)
76 {
77 int i;
78
79 for(i = 0; i < nconf; i++)
80 if(cistrcmp(confname[i], name) == 0)
81 return i;
82 return -1;
83 }
84
85 char*
getconf(char * name)86 getconf(char *name)
87 {
88 int i;
89
90 i = findconf(name);
91 if(i >= 0)
92 return confval[i];
93 return nil;
94 }
95
96 void
addconf(char * name,char * val)97 addconf(char *name, char *val)
98 {
99 int i;
100
101 i = findconf(name);
102 if(i < 0){
103 if(val == nil || nconf >= MAXCONF)
104 return;
105 i = nconf++;
106 strecpy(confname[i], confname[i]+sizeof(confname[i]), name);
107 }
108 strecpy(confval[i], confval[i]+sizeof(confval[i]), val);
109 }
110
111 static void
writeconf(void)112 writeconf(void)
113 {
114 char *p, *q;
115 int n;
116
117 p = getconfenv();
118
119 if(waserror()) {
120 free(p);
121 nexterror();
122 }
123
124 /* convert to name=value\n format */
125 for(q=p; *q; q++) {
126 q += strlen(q);
127 *q = '=';
128 q += strlen(q);
129 *q = '\n';
130 }
131 n = q - p + 1;
132 if(n >= BOOTARGSLEN)
133 error("kernel configuration too large");
134 memmove(BOOTARGS, p, n);
135 memset(BOOTARGS + n, '\n', BOOTARGSLEN - n);
136 poperror();
137 free(p);
138 }
139
140 static void
plan9iniinit(char * s,int cmdline)141 plan9iniinit(char *s, int cmdline)
142 {
143 char *toks[MAXCONF];
144 int i, c, n;
145 char *v;
146
147 if((c = *s) < ' ' || c >= 0x80)
148 return;
149 if(cmdline)
150 n = tokenize(s, toks, MAXCONF);
151 else
152 n = getfields(s, toks, MAXCONF, 1, "\n");
153 for(i = 0; i < n; i++){
154 if(toks[i][0] == '#')
155 continue;
156 v = strchr(toks[i], '=');
157 if(v == nil)
158 continue;
159 *v++ = '\0';
160 addconf(toks[i], v);
161 }
162 }
163
164 static void
ataginit(Atag * a)165 ataginit(Atag *a)
166 {
167 int n;
168
169 if(a->tag != AtagCore){
170 plan9iniinit((char*)a, 0);
171 return;
172 }
173 while(a->tag != AtagNone){
174 switch(a->tag){
175 case AtagMem:
176 /* use only first bank */
177 if(conf.mem[0].limit == 0 && a->mem.size != 0){
178 memsize = a->mem.size;
179 conf.mem[0].base = a->mem.base;
180 conf.mem[0].limit = a->mem.base + memsize;
181 }
182 break;
183 case AtagCmdline:
184 n = (a->size * sizeof(u32int)) - offsetof(Atag, cmdline[0]);
185 if(a->cmdline + n < BOOTARGS + BOOTARGSLEN)
186 a->cmdline[n] = 0;
187 else
188 BOOTARGS[BOOTARGSLEN-1] = 0;
189 plan9iniinit(a->cmdline, 1);
190 break;
191 }
192 a = (Atag*)((u32int*)a + a->size);
193 }
194 }
195
196 void
machinit(void)197 machinit(void)
198 {
199 m->machno = 0;
200 machaddr[m->machno] = m;
201
202 m->ticks = 1;
203 m->perf.period = 1;
204
205 conf.nmach = 1;
206
207 active.machs = 1;
208 active.exiting = 0;
209
210 up = nil;
211 }
212
213 static void
optionsinit(char * s)214 optionsinit(char* s)
215 {
216 strecpy(oargb, oargb+sizeof(oargb), s);
217
218 oargblen = strlen(oargb);
219 oargc = tokenize(oargb, oargv, nelem(oargv)-1);
220 oargv[oargc] = nil;
221 }
222
223 void
main(void)224 main(void)
225 {
226 extern char edata[], end[];
227 uint rev;
228
229 okay(1);
230 m = (Mach*)MACHADDR;
231 memset(edata, 0, end - edata); /* clear bss */
232 machinit();
233 mmuinit1();
234
235 optionsinit("/boot/boot boot");
236 quotefmtinstall();
237
238 ataginit((Atag*)BOOTARGS);
239 confinit(); /* figures out amount of memory */
240 xinit();
241 uartconsinit();
242 screeninit();
243
244 print("\nPlan 9 from Bell Labs\n");
245 rev = getfirmware();
246 print("firmware: rev %d\n", rev);
247 if(rev < Minfirmrev){
248 print("Sorry, firmware (start*.elf) must be at least rev %d"
249 " or newer than %s\n", Minfirmrev, Minfirmdate);
250 for(;;)
251 ;
252 }
253 trapinit();
254 clockinit();
255 printinit();
256 timersinit();
257 if(conf.monitor)
258 swcursorinit();
259 cpuidprint();
260 archreset();
261
262 procinit0();
263 initseg();
264 links();
265 chandevreset(); /* most devices are discovered here */
266 pageinit();
267 swapinit();
268 userinit();
269 schedinit();
270 assert(0); /* shouldn't have returned */
271 }
272
273 /*
274 * starting place for first process
275 */
276 void
init0(void)277 init0(void)
278 {
279 int i;
280 char buf[2*KNAMELEN];
281
282 up->nerrlab = 0;
283 coherence();
284 spllo();
285
286 /*
287 * These are o.k. because rootinit is null.
288 * Then early kproc's will have a root and dot.
289 */
290 up->slash = namec("#/", Atodir, 0, 0);
291 pathclose(up->slash->path);
292 up->slash->path = newpath("/");
293 up->dot = cclone(up->slash);
294
295 chandevinit();
296
297 if(!waserror()){
298 snprint(buf, sizeof(buf), "%s %s", "ARM", conffile);
299 ksetenv("terminal", buf, 0);
300 ksetenv("cputype", "arm", 0);
301 if(cpuserver)
302 ksetenv("service", "cpu", 0);
303 else
304 ksetenv("service", "terminal", 0);
305 snprint(buf, sizeof(buf), "-a %s", getethermac());
306 ksetenv("etherargs", buf, 0);
307
308 /* convert plan9.ini variables to #e and #ec */
309 for(i = 0; i < nconf; i++) {
310 ksetenv(confname[i], confval[i], 0);
311 ksetenv(confname[i], confval[i], 1);
312 }
313 poperror();
314 }
315 kproc("alarm", alarmkproc, 0);
316 touser(sp);
317 assert(0); /* shouldn't have returned */
318 }
319
320 static void
bootargs(uintptr base)321 bootargs(uintptr base)
322 {
323 int i;
324 ulong ssize;
325 char **av, *p;
326
327 /*
328 * Push the boot args onto the stack.
329 * The initial value of the user stack must be such
330 * that the total used is larger than the maximum size
331 * of the argument list checked in syscall.
332 */
333 i = oargblen+1;
334 p = UINT2PTR(STACKALIGN(base + BY2PG - Ustkheadroom - i));
335 memmove(p, oargb, i);
336
337 /*
338 * Now push the argv pointers.
339 * The code jumped to by touser in lproc.s expects arguments
340 * main(char* argv0, ...)
341 * and calls
342 * startboot("/boot/boot", &argv0)
343 * not the usual (int argc, char* argv[])
344 */
345 av = (char**)(p - (oargc+1)*sizeof(char*));
346 ssize = base + BY2PG - PTR2UINT(av);
347 for(i = 0; i < oargc; i++)
348 *av++ = (oargv[i] - oargb) + (p - base) + (USTKTOP - BY2PG);
349 *av = nil;
350 sp = USTKTOP - ssize;
351 }
352
353 /*
354 * create the first process
355 */
356 void
userinit(void)357 userinit(void)
358 {
359 Proc *p;
360 Segment *s;
361 KMap *k;
362 Page *pg;
363
364 /* no processes yet */
365 up = nil;
366
367 p = newproc();
368 p->pgrp = newpgrp();
369 p->egrp = smalloc(sizeof(Egrp));
370 p->egrp->ref = 1;
371 p->fgrp = dupfgrp(nil);
372 p->rgrp = newrgrp();
373 p->procmode = 0640;
374
375 kstrdup(&eve, "");
376 kstrdup(&p->text, "*init*");
377 kstrdup(&p->user, eve);
378
379 /*
380 * Kernel Stack
381 */
382 p->sched.pc = PTR2UINT(init0);
383 p->sched.sp = PTR2UINT(p->kstack+KSTACK-sizeof(up->s.args)-sizeof(uintptr));
384 p->sched.sp = STACKALIGN(p->sched.sp);
385
386 /*
387 * User Stack
388 *
389 * Technically, newpage can't be called here because it
390 * should only be called when in a user context as it may
391 * try to sleep if there are no pages available, but that
392 * shouldn't be the case here.
393 */
394 s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
395 s->flushme++;
396 p->seg[SSEG] = s;
397 pg = newpage(1, 0, USTKTOP-BY2PG);
398 segpage(s, pg);
399 k = kmap(pg);
400 bootargs(VA(k));
401 kunmap(k);
402
403 /*
404 * Text
405 */
406 s = newseg(SG_TEXT, UTZERO, 1);
407 p->seg[TSEG] = s;
408 pg = newpage(1, 0, UTZERO);
409 memset(pg->cachectl, PG_TXTFLUSH, sizeof(pg->cachectl));
410 segpage(s, pg);
411 k = kmap(s->map[0]->pages[0]);
412 memmove(UINT2PTR(VA(k)), initcode, sizeof initcode);
413 kunmap(k);
414
415 ready(p);
416 }
417
418 void
confinit(void)419 confinit(void)
420 {
421 int i;
422 ulong kpages;
423 uintptr pa;
424 char *p;
425
426 if(0 && (p = getconf("service")) != nil){
427 if(strcmp(p, "cpu") == 0)
428 cpuserver = 1;
429 else if(strcmp(p,"terminal") == 0)
430 cpuserver = 0;
431 }
432 if((p = getconf("*maxmem")) != nil){
433 memsize = strtoul(p, 0, 0) - PHYSDRAM;
434 if (memsize < 16*MB) /* sanity */
435 memsize = 16*MB;
436 }
437
438 getramsize(&conf.mem[0]);
439 if(conf.mem[0].limit == 0){
440 conf.mem[0].base = PHYSDRAM;
441 conf.mem[0].limit = PHYSDRAM + memsize;
442 }else if(p != nil)
443 conf.mem[0].limit = conf.mem[0].base + memsize;
444
445 conf.npage = 0;
446 pa = PADDR(PGROUND(PTR2UINT(end)));
447
448 /*
449 * we assume that the kernel is at the beginning of one of the
450 * contiguous chunks of memory and fits therein.
451 */
452 for(i=0; i<nelem(conf.mem); i++){
453 /* take kernel out of allocatable space */
454 if(pa > conf.mem[i].base && pa < conf.mem[i].limit)
455 conf.mem[i].base = pa;
456
457 conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base)/BY2PG;
458 conf.npage += conf.mem[i].npage;
459 }
460
461 conf.upages = (conf.npage*80)/100;
462 conf.ialloc = ((conf.npage-conf.upages)/2)*BY2PG;
463
464 /* only one processor */
465 conf.nmach = 1;
466
467 /* set up other configuration parameters */
468 conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
469 if(cpuserver)
470 conf.nproc *= 3;
471 if(conf.nproc > 2000)
472 conf.nproc = 2000;
473 conf.nswap = conf.npage*3;
474 conf.nswppo = 4096;
475 conf.nimage = 200;
476
477 conf.copymode = 0; /* copy on write */
478
479 /*
480 * Guess how much is taken by the large permanent
481 * datastructures. Mntcache and Mntrpc are not accounted for
482 * (probably ~300KB).
483 */
484 kpages = conf.npage - conf.upages;
485 kpages *= BY2PG;
486 kpages -= conf.upages*sizeof(Page)
487 + conf.nproc*sizeof(Proc)
488 + conf.nimage*sizeof(Image)
489 + conf.nswap
490 + conf.nswppo*sizeof(Page);
491 mainmem->maxsize = kpages;
492 if(!cpuserver)
493 /*
494 * give terminals lots of image memory, too; the dynamic
495 * allocation will balance the load properly, hopefully.
496 * be careful with 32-bit overflow.
497 */
498 imagmem->maxsize = kpages;
499
500 }
501
502 static void
shutdown(int ispanic)503 shutdown(int ispanic)
504 {
505 int ms, once;
506
507 lock(&active);
508 if(ispanic)
509 active.ispanic = ispanic;
510 else if(m->machno == 0 && (active.machs & (1<<m->machno)) == 0)
511 active.ispanic = 0;
512 once = active.machs & (1<<m->machno);
513 active.machs &= ~(1<<m->machno);
514 active.exiting = 1;
515 unlock(&active);
516
517 if(once)
518 iprint("cpu%d: exiting\n", m->machno);
519 spllo();
520 for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
521 delay(TK2MS(2));
522 if(active.machs == 0 && consactive() == 0)
523 break;
524 }
525 delay(1000);
526 }
527
528 /*
529 * exit kernel either on a panic or user request
530 */
531 void
exit(int code)532 exit(int code)
533 {
534 shutdown(code);
535 splfhi();
536 archreboot();
537 }
538
539 /*
540 * stub for ../omap/devether.c
541 */
542 int
isaconfig(char * class,int ctlrno,ISAConf * isa)543 isaconfig(char *class, int ctlrno, ISAConf *isa)
544 {
545 USED(ctlrno);
546 USED(isa);
547 return strcmp(class, "ether") == 0;
548 }
549
550 /*
551 * the new kernel is already loaded at address `code'
552 * of size `size' and entry point `entry'.
553 */
554 void
reboot(void * entry,void * code,ulong size)555 reboot(void *entry, void *code, ulong size)
556 {
557 void (*f)(ulong, ulong, ulong);
558
559 print("starting reboot...");
560 writeconf();
561 shutdown(0);
562
563 /*
564 * should be the only processor running now
565 */
566
567 print("reboot entry %#lux code %#lux size %ld\n",
568 PADDR(entry), PADDR(code), size);
569 delay(100);
570
571 /* turn off buffered serial console */
572 serialoq = nil;
573 kprintoq = nil;
574 screenputs = nil;
575
576 /* shutdown devices */
577 chandevshutdown();
578
579 /* stop the clock (and watchdog if any) */
580 clockshutdown();
581
582 splfhi();
583 intrsoff();
584
585 /* setup reboot trampoline function */
586 f = (void*)REBOOTADDR;
587 memmove(f, rebootcode, sizeof(rebootcode));
588 cacheuwbinv();
589
590 /* off we go - never to return */
591 (*f)(PADDR(entry), PADDR(code), size);
592
593 iprint("loaded kernel returned!\n");
594 delay(1000);
595 archreboot();
596 }
597
598 int
cmpswap(long * addr,long old,long new)599 cmpswap(long *addr, long old, long new)
600 {
601 return cas32(addr, old, new);
602 }
603