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Mercurial > hg > plan9front / sys/src/9/bcm/main.c

changeset 6198: f498f01d02f3
parent: e584910aa1b9
child: f80792d28e0e
author: cinap_lenrek@felloff.net
date: Sun, 29 Oct 2017 23:09:54 +0100
permissions: -rw-r--r--
description: kernel: introduce devswap #ΒΆ to serve /dev/swap and handle swapfile encryption
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 /* Firmware compatibility */
14 #define Minfirmrev 326770
15 #define Minfirmdate "22 Jul 2012"
16 
17 /*
18  * Where configuration info is left for the loaded programme.
19  */
20 #define BOOTARGS ((char*)CONFADDR)
21 #define BOOTARGSLEN (MACHADDR-CONFADDR)
22 #define MAXCONF 64
23 #define MAXCONFLINE 160
24 
25 uintptr kseg0 = KZERO;
26 Mach* machaddr[MAXMACH];
27 Conf conf;
28 ulong memsize = 128*1024*1024;
29 
30 /*
31  * Option arguments from the command line.
32  * oargv[0] is the boot file.
33  */
34 static int oargc;
35 static char* oargv[20];
36 static char oargb[128];
37 static int oargblen;
38 
39 static uintptr sp; /* XXX - must go - user stack of init proc */
40 
41 /* store plan9.ini contents here at least until we stash them in #ec */
42 static char confname[MAXCONF][KNAMELEN];
43 static char confval[MAXCONF][MAXCONFLINE];
44 static int nconf;
45 
46 typedef struct Atag Atag;
47 struct Atag {
48  u32int size; /* size of atag in words, including this header */
49  u32int tag; /* atag type */
50  union {
51  u32int data[1]; /* actually [size-2] */
52  /* AtagMem */
53  struct {
54  u32int size;
55  u32int base;
56  } mem;
57  /* AtagCmdLine */
58  char cmdline[1]; /* actually [4*(size-2)] */
59  };
60 };
61 
62 enum {
63  AtagNone = 0x00000000,
64  AtagCore = 0x54410001,
65  AtagMem = 0x54410002,
66  AtagCmdline = 0x54410009,
67 };
68 
69 static int
70 findconf(char *name)
71 {
72  int i;
73 
74  for(i = 0; i < nconf; i++)
75  if(cistrcmp(confname[i], name) == 0)
76  return i;
77  return -1;
78 }
79 
80 char*
81 getconf(char *name)
82 {
83  int i;
84 
85  i = findconf(name);
86  if(i >= 0)
87  return confval[i];
88  return nil;
89 }
90 
91 void
92 addconf(char *name, char *val)
93 {
94  int i;
95 
96  i = findconf(name);
97  if(i < 0){
98  if(val == nil || nconf >= MAXCONF)
99  return;
100  i = nconf++;
101  strecpy(confname[i], confname[i]+sizeof(confname[i]), name);
102  }
103  strecpy(confval[i], confval[i]+sizeof(confval[i]), val);
104 }
105 
106 static void
107 writeconf(void)
108 {
109  char *p, *q;
110  int n;
111 
112  p = getconfenv();
113 
114  if(waserror()) {
115  free(p);
116  nexterror();
117  }
118 
119  /* convert to name=value\n format */
120  for(q=p; *q; q++) {
121  q += strlen(q);
122  *q = '=';
123  q += strlen(q);
124  *q = '\n';
125  }
126  n = q - p + 1;
127  if(n >= BOOTARGSLEN)
128  error("kernel configuration too large");
129  memmove(BOOTARGS, p, n);
130  memset(BOOTARGS + n, '\n', BOOTARGSLEN - n);
131  poperror();
132  free(p);
133 }
134 
135 static void
136 plan9iniinit(char *s, int cmdline)
137 {
138  char *toks[MAXCONF];
139  int i, c, n;
140  char *v;
141 
142  if((c = *s) < ' ' || c >= 0x80)
143  return;
144  if(cmdline)
145  n = tokenize(s, toks, MAXCONF);
146  else
147  n = getfields(s, toks, MAXCONF, 1, "\n");
148  for(i = 0; i < n; i++){
149  if(toks[i][0] == '#')
150  continue;
151  v = strchr(toks[i], '=');
152  if(v == nil)
153  continue;
154  *v++ = '\0';
155  addconf(toks[i], v);
156  }
157 }
158 
159 static void
160 ataginit(Atag *a)
161 {
162  int n;
163 
164  if(a->tag != AtagCore){
165  plan9iniinit((char*)a, 0);
166  return;
167  }
168  while(a->tag != AtagNone){
169  switch(a->tag){
170  case AtagMem:
171  /* use only first bank */
172  if(conf.mem[0].limit == 0 && a->mem.size != 0){
173  memsize = a->mem.size;
174  conf.mem[0].base = a->mem.base;
175  conf.mem[0].limit = a->mem.base + memsize;
176  }
177  break;
178  case AtagCmdline:
179  n = (a->size * sizeof(u32int)) - offsetof(Atag, cmdline[0]);
180  if(a->cmdline + n < BOOTARGS + BOOTARGSLEN)
181  a->cmdline[n] = 0;
182  else
183  BOOTARGS[BOOTARGSLEN-1] = 0;
184  plan9iniinit(a->cmdline, 1);
185  break;
186  }
187  a = (Atag*)((u32int*)a + a->size);
188  }
189 }
190 
191 void
192 machinit(void)
193 {
194  m->machno = 0;
195  machaddr[m->machno] = m;
196 
197  m->ticks = 1;
198  m->perf.period = 1;
199 
200  conf.nmach = 1;
201 
202  active.machs[0] = 1;
203  active.exiting = 0;
204 
205  up = nil;
206 }
207 
208 static void
209 optionsinit(char* s)
210 {
211  strecpy(oargb, oargb+sizeof(oargb), s);
212 
213  oargblen = strlen(oargb);
214  oargc = tokenize(oargb, oargv, nelem(oargv)-1);
215  oargv[oargc] = nil;
216 }
217 
218 void
219 gpiomeminit(void)
220 {
221  Physseg seg;
222  memset(&seg, 0, sizeof seg);
223  seg.attr = SG_PHYSICAL;
224  seg.name = "gpio";
225  seg.pa = (VIRTIO+0x200000);
226  seg.size = BY2PG;
227  addphysseg(&seg);
228 }
229 
230 
231 void
232 main(void)
233 {
234  extern char edata[], end[];
235  uint rev;
236 
237  okay(1);
238  m = (Mach*)MACHADDR;
239  memset(edata, 0, end - edata); /* clear bss */
240  machinit();
241  mmuinit1();
242 
243  optionsinit("/boot/boot boot");
244  quotefmtinstall();
245 
246  ataginit((Atag*)BOOTARGS);
247  confinit(); /* figures out amount of memory */
248  xinit();
249  uartconsinit();
250  screeninit();
251 
252  print("\nPlan 9 from Bell Labs\n");
253  rev = getfirmware();
254  print("firmware: rev %d\n", rev);
255  if(rev < Minfirmrev){
256  print("Sorry, firmware (start.elf) must be at least rev %d (%s)\n",
257  Minfirmrev, Minfirmdate);
258  for(;;)
259  ;
260  }
261  trapinit();
262  clockinit();
263  printinit();
264  timersinit();
265  cpuidprint();
266  archreset();
267 
268  procinit0();
269  initseg();
270  links();
271  chandevreset(); /* most devices are discovered here */
272  pageinit();
273  userinit();
274  gpiomeminit();
275  schedinit();
276  assert(0); /* shouldn't have returned */
277 }
278 
279 /*
280  * starting place for first process
281  */
282 void
283 init0(void)
284 {
285  int i;
286  char buf[2*KNAMELEN];
287 
288  up->nerrlab = 0;
289  coherence();
290  spllo();
291 
292  /*
293  * These are o.k. because rootinit is null.
294  * Then early kproc's will have a root and dot.
295  */
296  up->slash = namec("#/", Atodir, 0, 0);
297  pathclose(up->slash->path);
298  up->slash->path = newpath("/");
299  up->dot = cclone(up->slash);
300 
301  chandevinit();
302 
303  if(!waserror()){
304  snprint(buf, sizeof(buf), "%s %s", "ARM", conffile);
305  ksetenv("terminal", buf, 0);
306  ksetenv("cputype", "arm", 0);
307  if(cpuserver)
308  ksetenv("service", "cpu", 0);
309  else
310  ksetenv("service", "terminal", 0);
311  snprint(buf, sizeof(buf), "-a %s", getethermac());
312  ksetenv("etherargs", buf, 0);
313 
314  /* convert plan9.ini variables to #e and #ec */
315  for(i = 0; i < nconf; i++) {
316  ksetenv(confname[i], confval[i], 0);
317  ksetenv(confname[i], confval[i], 1);
318  }
319  poperror();
320  }
321  kproc("alarm", alarmkproc, 0);
322  touser(sp);
323  assert(0); /* shouldn't have returned */
324 }
325 
326 static void
327 bootargs(uintptr base)
328 {
329  int i;
330  ulong ssize;
331  char **av, *p;
332 
333  /*
334  * Push the boot args onto the stack.
335  * The initial value of the user stack must be such
336  * that the total used is larger than the maximum size
337  * of the argument list checked in syscall.
338  */
339  i = oargblen+1;
340  p = UINT2PTR(STACKALIGN(base + BY2PG - sizeof(Tos) - i));
341  memmove(p, oargb, i);
342 
343  /*
344  * Now push the argv pointers.
345  * The code jumped to by touser in lproc.s expects arguments
346  * main(char* argv0, ...)
347  * and calls
348  * startboot("/boot/boot", &argv0)
349  * not the usual (int argc, char* argv[])
350  */
351  av = (char**)(p - (oargc+1)*sizeof(char*));
352  ssize = base + BY2PG - PTR2UINT(av);
353  for(i = 0; i < oargc; i++)
354  *av++ = (oargv[i] - oargb) + (p - base) + (USTKTOP - BY2PG);
355  *av = nil;
356  sp = USTKTOP - ssize;
357 }
358 
359 /*
360  * create the first process
361  */
362 void
363 userinit(void)
364 {
365  Proc *p;
366  Segment *s;
367  KMap *k;
368  Page *pg;
369 
370  /* no processes yet */
371  up = nil;
372 
373  p = newproc();
374  p->pgrp = newpgrp();
375  p->egrp = smalloc(sizeof(Egrp));
376  p->egrp->ref = 1;
377  p->fgrp = dupfgrp(nil);
378  p->rgrp = newrgrp();
379  p->procmode = 0640;
380 
381  kstrdup(&eve, "");
382  kstrdup(&p->text, "*init*");
383  kstrdup(&p->user, eve);
384 
385  /*
386  * Kernel Stack
387  */
388  p->sched.pc = PTR2UINT(init0);
389  p->sched.sp = PTR2UINT(p->kstack+KSTACK-sizeof(up->s.args)-sizeof(uintptr));
390  p->sched.sp = STACKALIGN(p->sched.sp);
391 
392  /*
393  * User Stack
394  *
395  * Technically, newpage can't be called here because it
396  * should only be called when in a user context as it may
397  * try to sleep if there are no pages available, but that
398  * shouldn't be the case here.
399  */
400  s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
401  s->flushme++;
402  p->seg[SSEG] = s;
403  pg = newpage(1, 0, USTKTOP-BY2PG);
404  segpage(s, pg);
405  k = kmap(pg);
406  bootargs(VA(k));
407  kunmap(k);
408 
409  /*
410  * Text
411  */
412  s = newseg(SG_TEXT, UTZERO, 1);
413  p->seg[TSEG] = s;
414  pg = newpage(1, 0, UTZERO);
415  pg->txtflush = ~0;
416  segpage(s, pg);
417  k = kmap(s->map[0]->pages[0]);
418  memmove(UINT2PTR(VA(k)), initcode, sizeof initcode);
419  kunmap(k);
420 
421  ready(p);
422 }
423 
424 void
425 confinit(void)
426 {
427  int i, userpcnt;
428  ulong kpages;
429  uintptr pa;
430  char *p;
431 
432  if(p = getconf("service")){
433  if(strcmp(p, "cpu") == 0)
434  cpuserver = 1;
435  else if(strcmp(p,"terminal") == 0)
436  cpuserver = 0;
437  }
438 
439  if(p = getconf("*kernelpercent"))
440  userpcnt = 100 - strtol(p, 0, 0);
441  else
442  userpcnt = 0;
443 
444  if((p = getconf("*maxmem")) != nil){
445  memsize = strtoul(p, 0, 0) - PHYSDRAM;
446  if (memsize < 16*MB) /* sanity */
447  memsize = 16*MB;
448  }
449 
450  getramsize(&conf.mem[0]);
451  if(conf.mem[0].limit == 0){
452  conf.mem[0].base = PHYSDRAM;
453  conf.mem[0].limit = PHYSDRAM + memsize;
454  }else if(p != nil)
455  conf.mem[0].limit = conf.mem[0].base + memsize;
456 
457  conf.npage = 0;
458  pa = PADDR(PGROUND(PTR2UINT(end)));
459 
460  /*
461  * we assume that the kernel is at the beginning of one of the
462  * contiguous chunks of memory and fits therein.
463  */
464  for(i=0; i<nelem(conf.mem); i++){
465  /* take kernel out of allocatable space */
466  if(pa > conf.mem[i].base && pa < conf.mem[i].limit)
467  conf.mem[i].base = pa;
468 
469  conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base)/BY2PG;
470  conf.npage += conf.mem[i].npage;
471  }
472 
473  if(userpcnt < 10)
474  userpcnt = 60 + cpuserver*10;
475  kpages = conf.npage - (conf.npage*userpcnt)/100;
476 
477  /*
478  * can't go past the end of virtual memory
479  * (ulong)-KZERO is 2^32 - KZERO
480  */
481  if(kpages > ((ulong)-KZERO)/BY2PG)
482  kpages = ((ulong)-KZERO)/BY2PG;
483 
484  conf.upages = conf.npage - kpages;
485  conf.ialloc = (kpages/2)*BY2PG;
486 
487  /* only one processor */
488  conf.nmach = 1;
489 
490  /* set up other configuration parameters */
491  conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
492  if(cpuserver)
493  conf.nproc *= 3;
494  if(conf.nproc > 2000)
495  conf.nproc = 2000;
496  conf.nswap = conf.npage*3;
497  conf.nswppo = 4096;
498  conf.nimage = 200;
499 
500  conf.copymode = 0; /* copy on write */
501 
502  /*
503  * Guess how much is taken by the large permanent
504  * datastructures. Mntcache and Mntrpc are not accounted for.
505  */
506  kpages = conf.npage - conf.upages;
507  kpages *= BY2PG;
508  kpages -= conf.upages*sizeof(Page)
509  + conf.nproc*sizeof(Proc)
510  + conf.nimage*sizeof(Image)
511  + conf.nswap
512  + conf.nswppo*sizeof(Page*);
513  mainmem->maxsize = kpages;
514  if(!cpuserver)
515  /*
516  * give terminals lots of image memory, too; the dynamic
517  * allocation will balance the load properly, hopefully.
518  * be careful with 32-bit overflow.
519  */
520  imagmem->maxsize = kpages;
521 
522 }
523 
524 /*
525  * exit kernel either on a panic or user request
526  */
527 void
528 exit(int)
529 {
530  cpushutdown();
531  splfhi();
532  archreboot();
533 }
534 
535 /*
536  * stub for ../omap/devether.c
537  */
538 int
539 isaconfig(char *class, int ctlrno, ISAConf *isa)
540 {
541  USED(ctlrno);
542  USED(isa);
543  return strcmp(class, "ether") == 0;
544 }
545 
546 /*
547  * the new kernel is already loaded at address `code'
548  * of size `size' and entry point `entry'.
549  */
550 void
551 reboot(void *entry, void *code, ulong size)
552 {
553  void (*f)(ulong, ulong, ulong);
554 
555  writeconf();
556  cpushutdown();
557 
558  /* turn off buffered serial console */
559  serialoq = nil;
560  kprintoq = nil;
561  screenputs = nil;
562 
563  /* shutdown devices */
564  chandevshutdown();
565 
566  /* stop the clock (and watchdog if any) */
567  clockshutdown();
568 
569  splfhi();
570  intrsoff();
571 
572  /* setup reboot trampoline function */
573  f = (void*)REBOOTADDR;
574  memmove(f, rebootcode, sizeof(rebootcode));
575  cacheuwbinv();
576 
577  /* off we go - never to return */
578  (*f)(PADDR(entry), PADDR(code), size);
579 }
580 
581 int
582 cmpswap(long *addr, long old, long new)
583 {
584  return cas32(addr, old, new);
585 }
586 
587 void
588 setupwatchpts(Proc *, Watchpt *, int n)
589 {
590  if(n > 0)
591  error("no watchpoints");
592 }