Subversion Repositories planix.SVN

#include "u.h"

#include "../port/lib.h"

#include "mem.h"

#include "dat.h"

#include "fns.h"

#include "io.h"

#include "init.h"

#include <pool.h>

#include <tos.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 {

	Minmem	= 256*MB,			/* conservative default */

	/* space for syscall args, return PC, top-of-stack struct */

	Ustkheadroom	= sizeof(Sargs) + sizeof(uintptr) + sizeof(Tos),

};

#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;

int normalprint;

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;

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);

	memset(BOOTARGS + n, '\n', BOOTARGSLEN - 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;

	strcpy(oenv, "");

	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;

}

void

main(void)

{

//	int i;

	extern char bdata[], edata[], end[], etext[];

	static ulong vfy = 0xcafebabe;

	/* l.s has already printed "Plan 9 from Be" */

//	m = mach;					/* now done in l.s */

	/* realign data seg; apparently -H0 -R4096 does not pad the text seg */

	if (vfy != 0xcafebabe) {

//		wave('<'); wave('-');

		memmove(bdata, etext, edata - bdata);

	}

	/*

	 * once data segment is in place, always zero bss since we may

	 * have been loaded by another Plan 9 kernel.

	 */

	memset(edata, 0, end - edata);		/* zero BSS */

	cacheuwbinv();

	l2cacheuwbinv();

	if (vfy != 0xcafebabe)

		panic("data segment misaligned");

	vfy = 0;

wave('l');

	machinit();

	mmuinit();

	optionsinit("/boot/boot boot");

	quotefmtinstall();

	/* want plan9.ini to be able to affect memory sizing in confinit */

	plan9iniinit();		/* before we step on plan9.ini in low memory */

	trapinit();		/* so confinit can probe memory to size it */

	confinit();		/* figures out amount of memory */

	/* xinit prints (if it can), so finish up the banner here. */

	delay(500);

	iprint("l Labs\n\n");

	delay(500);

	xinit();

	mainmem->flags |= POOL_ANTAGONISM /* | POOL_PARANOIA */ ;

	/*

	 * Printinit will cause the first malloc call.

	 * (printinit->qopen->malloc) unless any of the

	 * above (like clockinit) 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.

	 */

	archreset();			/* configure clock signals */

	clockinit();			/* start clocks */

	timersinit();

	watchdoginit();

	delay(250);			/* let uart catch up */

	printinit();

	kbdenable();

	cpuidprint();

//	chkmissing();

	procinit0();

	initseg();

	dmainit();

	links();

	conf.monitor = 1;

	screeninit();

	chandevreset();			/* most devices are discovered here */

//	i8250console();			/* too early; see init0 */

	pageinit();

	swapinit();

	userinit();

	schedinit();

}

void

machinit(void)

{

	if (m == 0)

		wave('?');

//	memset(m, 0, sizeof(Mach));	/* done by l.s, now contains stack */

	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();

}

int

isaconfig(char *class, int ctlrno, ISAConf *isa)

{

	char cc[32], *p;

	int i;

	snprint(cc, sizeof cc, "%s%d", class, ctlrno);

	p = getconf(cc);

	if(p == nil)

		return 0;

	isa->type = "";

	isa->nopt = tokenize(p, isa->opt, NISAOPT);

	for(i = 0; i < isa->nopt; i++){

		p = isa->opt[i];

		if(cistrncmp(p, "type=", 5) == 0)

			isa->type = p + 5;

		else if(cistrncmp(p, "port=", 5) == 0)

			isa->port = strtoul(p+5, &p, 0);

		else if(cistrncmp(p, "irq=", 4) == 0)

			isa->irq = strtoul(p+4, &p, 0);

		else if(cistrncmp(p, "dma=", 4) == 0)

			isa->dma = strtoul(p+4, &p, 0);

		else if(cistrncmp(p, "mem=", 4) == 0)

			isa->mem = strtoul(p+4, &p, 0);

		else if(cistrncmp(p, "size=", 5) == 0)

			isa->size = strtoul(p+5, &p, 0);

		else if(cistrncmp(p, "freq=", 5) == 0)

			isa->freq = strtoul(p+5, &p, 0);

	}

	return 1;

}

/*

 * 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);

	print("starting reboot...");

	writeconf();

	shutdown(0);

	/*

	 * should be the only processor running now

	 */

	print("reboot entry %#lux code %#lux size %ld\n",

		PADDR(entry), PADDR(code), size);

	delay(100);

	/* turn off buffered serial console */

	serialoq = nil;

	kprintoq = nil;

	screenputs = nil;

	/* shutdown devices */

	chandevshutdown();

	/* call off the dog */

	clockshutdown();

	splhi();

	intrsoff();

	/* setup reboot trampoline function */

	f = (void*)REBOOTADDR;

	memmove(f, rebootcode, sizeof(rebootcode));

	cacheuwbinv();

	l2cacheuwbinv();

	/* off we go - never to return */

	(*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];

	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);

	dmatest();		/* needs `up' set, so can't do it earlier */

	chandevinit();

	i8250console();		/* might be redundant, but harmless */

	if(kbdq == nil)

		panic("init0: nil kbdq");

	if(serialoq == nil)

		panic("init0: nil serialoq");

	normalprint = 1;

	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 - Ustkheadroom - 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);

	s->flushme++;

	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);

	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 omapmem[nelem(conf.mem)] = {

	/*

	 * Memory available to Plan 9:

	 */

	{ .base = PHYSDRAM, .limit = PHYSDRAM + Minmem, },

};

ulong memsize = Minmem;

static int

gotmem(uintptr sz)

{

	uintptr addr;

	addr = PHYSDRAM + sz - BY2WD;

	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(omapmem) > 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;

	}

	omapmem[0].limit = PHYSDRAM + memsize;

	memmove(conf.mem, omapmem, sizeof(omapmem));

	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*80)/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;

//	archconfinit();

}

int

cmpswap(long *addr, long old, long new)

{

	return cas32(addr, old, new);

}