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- #include "u.h"
- #include "../port/lib.h"
- #include "mem.h"
- #include "dat.h"
- #include "fns.h"
- #include "init.h"
- #include "arm.h"
- #include <pool.h>
- #include "reboot.h"
- /*
- * Where configuration info is left for the loaded programme.
- * This will turn into a structure as more is done by the boot loader
- * (e.g. why parse the .ini file twice?).
- * There are 3584 bytes available at CONFADDR.
- */
- #define BOOTARGS ((char*)CONFADDR)
- #define BOOTARGSLEN (16*KiB) /* limit in devenv.c */
- #define MAXCONF 64
- #define MAXCONFLINE 160
- enum {
- Maxmem = 512*MB, /* limited by address ranges */
- Minmem = 256*MB, /* conservative default */
- };
- #define isascii(c) ((uchar)(c) > 0 && (uchar)(c) < 0177)
- uintptr kseg0 = KZERO;
- Mach* machaddr[MAXMACH];
- /*
- * Option arguments from the command line.
- * oargv[0] is the boot file.
- * Optionsinit() is called from multiboot()
- * or some other machine-dependent place
- * to set it all up.
- */
- static int oargc;
- static char* oargv[20];
- static char oargb[128];
- static int oargblen;
- static char oenv[4096];
- static uintptr sp; /* XXX - must go - user stack of init proc */
- int vflag;
- char debug[256];
- /* store plan9.ini contents here at least until we stash them in #ec */
- static char confname[MAXCONF][KNAMELEN];
- static char confval[MAXCONF][MAXCONFLINE];
- static int nconf;
- #ifdef CRYPTOSANDBOX
- uchar sandbox[64*1024+BY2PG];
- #endif
- static int
- findconf(char *name)
- {
- int i;
- for(i = 0; i < nconf; i++)
- if(cistrcmp(confname[i], name) == 0)
- return i;
- return -1;
- }
- char*
- getconf(char *name)
- {
- int i;
- i = findconf(name);
- if(i >= 0)
- return confval[i];
- return nil;
- }
- void
- addconf(char *name, char *val)
- {
- int i;
- i = findconf(name);
- if(i < 0){
- if(val == nil || nconf >= MAXCONF)
- return;
- i = nconf++;
- strecpy(confname[i], confname[i]+sizeof(confname[i]), name);
- }
- // confval[i] = val;
- strecpy(confval[i], confval[i]+sizeof(confval[i]), val);
- }
- static void
- writeconf(void)
- {
- char *p, *q;
- int n;
- p = getconfenv();
- if(waserror()) {
- free(p);
- nexterror();
- }
- /* convert to name=value\n format */
- for(q=p; *q; q++) {
- q += strlen(q);
- *q = '=';
- q += strlen(q);
- *q = '\n';
- }
- n = q - p + 1;
- if(n >= BOOTARGSLEN)
- error("kernel configuration too large");
- memmove(BOOTARGS, p, n);
- poperror();
- free(p);
- }
- /*
- * assumes that we have loaded our /cfg/pxe/mac file at 0x1000 with
- * tftp in u-boot. no longer uses malloc, so can be called early.
- */
- static void
- plan9iniinit(void)
- {
- char *k, *v, *next;
- k = (char *)CONFADDR;
- if(!isascii(*k))
- return;
- for(; k && *k != '\0'; k = next) {
- if (!isascii(*k)) /* sanity check */
- break;
- next = strchr(k, '\n');
- if (next)
- *next++ = '\0';
- if (*k == '\0' || *k == '\n' || *k == '#')
- continue;
- v = strchr(k, '=');
- if(v == nil)
- continue; /* mal-formed line */
- *v++ = '\0';
- addconf(k, v);
- }
- }
- static void
- optionsinit(char* s)
- {
- char *o;
- o = strecpy(oargb, oargb+sizeof(oargb), s)+1;
- if(getenv("bootargs", o, o - oargb) != nil)
- *(o-1) = ' ';
- oargblen = strlen(oargb);
- oargc = tokenize(oargb, oargv, nelem(oargv)-1);
- oargv[oargc] = nil;
- }
- char*
- getenv(char* name, char* buf, int n)
- {
- char *e, *p, *q;
- p = oenv;
- while(*p != 0){
- if((e = strchr(p, '=')) == nil)
- break;
- for(q = name; p < e; p++){
- if(*p != *q)
- break;
- q++;
- }
- if(p == e && *q == 0){
- strecpy(buf, buf+n, e+1);
- return buf;
- }
- p += strlen(p)+1;
- }
- return nil;
- }
- #include "io.h"
- typedef struct Spiregs Spiregs;
- struct Spiregs {
- ulong ictl; /* interface ctl */
- ulong icfg; /* interface config */
- ulong out; /* data out */
- ulong in; /* data in */
- ulong ic; /* interrupt cause */
- ulong im; /* interrupt mask */
- ulong _pad[2];
- ulong dwrcfg; /* direct write config */
- ulong dwrhdr; /* direct write header */
- };
- enum {
- /* ictl bits */
- Csnact = 1<<0, /* serial memory activated */
- /* icfg bits */
- Bytelen = 1<<5, /* 2^(this_bit) bytes per transfer */
- Dirrdcmd= 1<<10, /* flag: fast read */
- };
- static void
- dumpbytes(uchar *bp, long max)
- {
- iprint("%#p: ", bp);
- for (; max > 0; max--)
- iprint("%02.2ux ", *bp++);
- iprint("...\n");
- }
- void archconsole(void);
- vlong probeaddr(uintptr);
- static void
- spiprobe(void)
- {
- if (0) {
- /* generates repeated "spurious irqbridge interrupt: 00000010" on sheevaplug. */
- Spiregs *rp = (Spiregs *)soc.spi;
- if (probeaddr(soc.spi) < 0)
- return;
- rp->ictl |= Csnact;
- coherence();
- rp->icfg |= Dirrdcmd | 3<<8; /* fast reads, 4-byte addresses */
- rp->icfg &= ~Bytelen; /* one-byte reads */
- coherence();
- print("spi flash ignored: ctlr %#p, data %#ux", rp, PHYSSPIFLASH);
- mmuidmap(PHYSSPIFLASH, 1);
- if (probeaddr(PHYSSPIFLASH) < 0)
- print(" (no response)");
- print(": memory reads enabled\n");
- }
- }
- /*
- * entered from l.s with mmu enabled.
- *
- * we may have to realign the data segment; apparently 5l -H0 -R4096
- * does not pad the text segment. on the other hand, we may have been
- * loaded by another kernel.
- *
- * be careful not to touch the data segment until we know it's aligned.
- */
- void
- main(Mach* mach)
- {
- extern char bdata[], edata[], end[], etext[];
- static ulong vfy = 0xcafebabe;
- m = mach;
- if (vfy != 0xcafebabe)
- memmove(bdata, etext, edata - bdata);
- if (vfy != 0xcafebabe) {
- wave('?');
- panic("misaligned data segment");
- }
- memset(edata, 0, end - edata); /* zero bss */
- vfy = 0;
- wave('9');
- machinit();
- archreset();
- mmuinit();
- optionsinit("/boot/boot boot");
- quotefmtinstall();
- archconsole();
- wave(' ');
- /* want plan9.ini to be able to affect memory sizing in confinit */
- plan9iniinit(); /* before we step on plan9.ini in low memory */
- /* set memsize before xinit */
- confinit();
- /* xinit would print if it could */
- xinit();
- /*
- * Printinit will cause the first malloc call.
- * (printinit->qopen->malloc) unless any of the
- * above (like clockintr) do an irqenable, which
- * will call malloc.
- * If the system dies here it's probably due
- * to malloc(->xalloc) not being initialised
- * correctly, or the data segment is misaligned
- * (it's amazing how far you can get with
- * things like that completely broken).
- *
- * (Should be) boilerplate from here on.
- */
- trapinit();
- clockinit();
- printinit();
- uartkirkwoodconsole();
- /* only now can we print */
- print("from Bell Labs\n\n");
- #ifdef CRYPTOSANDBOX
- print("sandbox: 64K at physical %#lux, mapped to 0xf10b0000\n",
- PADDR((uintptr)sandbox & ~(BY2PG-1)));
- #endif
- archconfinit();
- cpuidprint();
- timersinit();
- procinit0();
- initseg();
- links();
- chandevreset(); /* most devices are discovered here */
- spiprobe();
- pageinit();
- swapinit();
- userinit();
- schedinit();
- panic("schedinit returned");
- }
- void
- cpuidprint(void)
- {
- char name[64];
- cputype2name(name, sizeof name);
- print("cpu%d: %lldMHz ARM %s\n", m->machno, m->cpuhz/1000000, name);
- }
- void
- machinit(void)
- {
- memset(m, 0, sizeof(Mach));
- m->machno = 0;
- machaddr[m->machno] = m;
- m->ticks = 1;
- m->perf.period = 1;
- conf.nmach = 1;
- active.machs = 1;
- active.exiting = 0;
- up = nil;
- }
- static void
- shutdown(int ispanic)
- {
- int ms, once;
- lock(&active);
- if(ispanic)
- active.ispanic = ispanic;
- else if(m->machno == 0 && (active.machs & (1<<m->machno)) == 0)
- active.ispanic = 0;
- once = active.machs & (1<<m->machno);
- active.machs &= ~(1<<m->machno);
- active.exiting = 1;
- unlock(&active);
- if(once)
- iprint("cpu%d: exiting\n", m->machno);
- spllo();
- for(ms = 5*1000; ms > 0; ms -= TK2MS(2)){
- delay(TK2MS(2));
- if(active.machs == 0 && consactive() == 0)
- break;
- }
- delay(1000);
- }
- /*
- * exit kernel either on a panic or user request
- */
- void
- exit(int code)
- {
- shutdown(code);
- splhi();
- archreboot();
- }
- /*
- * the new kernel is already loaded at address `code'
- * of size `size' and entry point `entry'.
- */
- void
- reboot(void *entry, void *code, ulong size)
- {
- void (*f)(ulong, ulong, ulong);
- iprint("starting reboot...");
- writeconf();
-
- shutdown(0);
- /*
- * should be the only processor running now
- */
- print("shutting down...\n");
- delay(200);
- /* turn off buffered serial console */
- serialoq = nil;
- /* shutdown devices */
- chandevshutdown();
- /* call off the dog */
- clockshutdown();
- splhi();
- /* setup reboot trampoline function */
- f = (void*)REBOOTADDR;
- memmove(f, rebootcode, sizeof(rebootcode));
- cacheuwbinv();
- l2cacheuwb();
- print("rebooting...");
- iprint("entry %#lux code %#lux size %ld\n",
- PADDR(entry), PADDR(code), size);
- delay(100); /* wait for uart to quiesce */
- /* off we go - never to return */
- cacheuwbinv();
- l2cacheuwb();
- (*f)(PADDR(entry), PADDR(code), size);
- iprint("loaded kernel returned!\n");
- delay(1000);
- archreboot();
- }
- /*
- * starting place for first process
- */
- void
- init0(void)
- {
- int i;
- char buf[2*KNAMELEN];
- assert(up != nil);
- up->nerrlab = 0;
- coherence();
- spllo();
- /*
- * These are o.k. because rootinit is null.
- * Then early kproc's will have a root and dot.
- */
- up->slash = namec("#/", Atodir, 0, 0);
- pathclose(up->slash->path);
- up->slash->path = newpath("/");
- up->dot = cclone(up->slash);
- chandevinit();
- if(!waserror()){
- snprint(buf, sizeof(buf), "%s %s", "ARM", conffile);
- ksetenv("terminal", buf, 0);
- ksetenv("cputype", "arm", 0);
- if(cpuserver)
- ksetenv("service", "cpu", 0);
- else
- ksetenv("service", "terminal", 0);
- /* convert plan9.ini variables to #e and #ec */
- for(i = 0; i < nconf; i++) {
- ksetenv(confname[i], confval[i], 0);
- ksetenv(confname[i], confval[i], 1);
- }
- poperror();
- }
- kproc("alarm", alarmkproc, 0);
- touser(sp);
- }
- static void
- bootargs(uintptr base)
- {
- int i;
- ulong ssize;
- char **av, *p;
- /*
- * Push the boot args onto the stack.
- * The initial value of the user stack must be such
- * that the total used is larger than the maximum size
- * of the argument list checked in syscall.
- */
- i = oargblen+1;
- p = UINT2PTR(STACKALIGN(base + BY2PG - sizeof(up->s.args) - i));
- memmove(p, oargb, i);
- /*
- * Now push argc and the argv pointers.
- * This isn't strictly correct as the code jumped to by
- * touser in init9.s calls startboot (port/initcode.c) which
- * expects arguments
- * startboot(char *argv0, char **argv)
- * not the usual (int argc, char* argv[]), but argv0 is
- * unused so it doesn't matter (at the moment...).
- */
- av = (char**)(p - (oargc+2)*sizeof(char*));
- ssize = base + BY2PG - PTR2UINT(av);
- *av++ = (char*)oargc;
- for(i = 0; i < oargc; i++)
- *av++ = (oargv[i] - oargb) + (p - base) + (USTKTOP - BY2PG);
- *av = nil;
- /*
- * Leave space for the return PC of the
- * caller of initcode.
- */
- sp = USTKTOP - ssize - sizeof(void*);
- }
- /*
- * create the first process
- */
- void
- userinit(void)
- {
- Proc *p;
- Segment *s;
- KMap *k;
- Page *pg;
- /* no processes yet */
- up = nil;
- p = newproc();
- p->pgrp = newpgrp();
- p->egrp = smalloc(sizeof(Egrp));
- p->egrp->ref = 1;
- p->fgrp = dupfgrp(nil);
- p->rgrp = newrgrp();
- p->procmode = 0640;
- kstrdup(&eve, "");
- kstrdup(&p->text, "*init*");
- kstrdup(&p->user, eve);
- /*
- * Kernel Stack
- */
- p->sched.pc = PTR2UINT(init0);
- p->sched.sp = PTR2UINT(p->kstack+KSTACK-sizeof(up->s.args)-sizeof(uintptr));
- p->sched.sp = STACKALIGN(p->sched.sp);
- /*
- * User Stack
- *
- * Technically, newpage can't be called here because it
- * should only be called when in a user context as it may
- * try to sleep if there are no pages available, but that
- * shouldn't be the case here.
- */
- s = newseg(SG_STACK, USTKTOP-USTKSIZE, USTKSIZE/BY2PG);
- p->seg[SSEG] = s;
- pg = newpage(1, 0, USTKTOP-BY2PG);
- segpage(s, pg);
- k = kmap(pg);
- bootargs(VA(k));
- kunmap(k);
- /*
- * Text
- */
- s = newseg(SG_TEXT, UTZERO, 1);
- s->flushme++;
- p->seg[TSEG] = s;
- pg = newpage(1, 0, UTZERO);
- memset(pg->cachectl, PG_TXTFLUSH, sizeof(pg->cachectl));
- segpage(s, pg);
- k = kmap(s->map[0]->pages[0]);
- memmove(UINT2PTR(VA(k)), initcode, sizeof initcode);
- kunmap(k);
- ready(p);
- }
- Conf conf; /* XXX - must go - gag */
- Confmem sheevamem[nelem(conf.mem)] = {
- /*
- * Memory available to Plan 9:
- * the 8K is reserved for ethernet dma access violations to scribble on.
- */
- { .base = PHYSDRAM, .limit = PHYSDRAM + Maxmem - 8*1024, },
- };
- ulong memsize = Maxmem;
- static int
- gotmem(uintptr sz)
- {
- uintptr addr;
- addr = PHYSDRAM + sz - MB;
- mmuidmap(addr, 1);
- if (probeaddr(addr) >= 0) {
- memsize = sz;
- return 0;
- }
- return -1;
- }
- void
- confinit(void)
- {
- int i;
- ulong kpages;
- uintptr pa;
- char *p;
- /*
- * Copy the physical memory configuration to Conf.mem.
- */
- if(nelem(sheevamem) > nelem(conf.mem)){
- iprint("memory configuration botch\n");
- exit(1);
- }
- if((p = getconf("*maxmem")) != nil) {
- memsize = strtoul(p, 0, 0) - PHYSDRAM;
- if (memsize < 16*MB) /* sanity */
- memsize = 16*MB;
- }
- /*
- * see if all that memory exists; if not, find out how much does.
- * trapinit must have been called first.
- */
- if (gotmem(memsize) < 0 && gotmem(256*MB) < 0 && gotmem(128*MB) < 0) {
- iprint("can't find any memory, assuming %dMB\n", Minmem / MB);
- memsize = Minmem;
- }
- sheevamem[0].limit = PHYSDRAM + memsize - 8*1024;
- memmove(conf.mem, sheevamem, sizeof(sheevamem));
- conf.npage = 0;
- pa = PADDR(PGROUND(PTR2UINT(end)));
- /*
- * we assume that the kernel is at the beginning of one of the
- * contiguous chunks of memory and fits therein.
- */
- for(i=0; i<nelem(conf.mem); i++){
- /* take kernel out of allocatable space */
- if(pa > conf.mem[i].base && pa < conf.mem[i].limit)
- conf.mem[i].base = pa;
- conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base)/BY2PG;
- conf.npage += conf.mem[i].npage;
- }
- conf.upages = (conf.npage*90)/100;
- conf.ialloc = ((conf.npage-conf.upages)/2)*BY2PG;
- /* only one processor */
- conf.nmach = 1;
- /* set up other configuration parameters */
- conf.nproc = 100 + ((conf.npage*BY2PG)/MB)*5;
- if(cpuserver)
- conf.nproc *= 3;
- if(conf.nproc > 2000)
- conf.nproc = 2000;
- conf.nswap = conf.npage*3;
- conf.nswppo = 4096;
- conf.nimage = 200;
- conf.copymode = 0; /* copy on write */
- /*
- * Guess how much is taken by the large permanent
- * datastructures. Mntcache and Mntrpc are not accounted for
- * (probably ~300KB).
- */
- kpages = conf.npage - conf.upages;
- kpages *= BY2PG;
- kpages -= conf.upages*sizeof(Page)
- + conf.nproc*sizeof(Proc)
- + conf.nimage*sizeof(Image)
- + conf.nswap
- + conf.nswppo*sizeof(Page);
- mainmem->maxsize = kpages;
- if(!cpuserver)
- /*
- * give terminals lots of image memory, too; the dynamic
- * allocation will balance the load properly, hopefully.
- * be careful with 32-bit overflow.
- */
- imagmem->maxsize = kpages;
- }
- int
- cmpswap(long *addr, long old, long new)
- {
- return cas32(addr, old, new);
- }
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