code: 9ferno

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show config setup by bios and 9boot

--- a/os/pc/bootargs.c

+++ b/os/pc/bootargs.c

@@ -192,3 +192,13 @@

 	poperror();

 	free(p);

 }

+

+void

+showconf(void)

+{

+	int i;

+

+	for(i = 0; i < nconf; i++){

+		print("%s=%s\n", confname[i], confval[i]);

+	}

+}

--- a/os/pc/uarti8250.c

+++ b/os/pc/uarti8250.c

@@ -435,28 +435,25 @@

 static void

 i8250kick(Uart* uart)

 {

-	int i, n;

+	int i;

 	Ctlr *ctlr;

-	if(uart->cts == 0 || uart->blocked )

+	if(uart->cts == 0 || uart->blocked)

 		return;

 	/*

-	 *  Stagesize here imposes an arbitrary limit to make sure

+	 *  128 here is an arbitrary limit to make sure

 	 *  we don't stay in this loop too long.  If the

-	 *  chip's output queue is longer than Stagesize, too

-	 *  bad, performance will be slower.

-	 *  Stagesize = 1024

+	 *  chip's output queue is longer than 128, too

+	 *  bad -- presotto

 	 */

 	ctlr = uart->regs;

-	if(!(csr8r(ctlr, Lsr) & Thre))

-		return;

-	for(n = uartstageoutput(uart); n > 0; n--, uart->op++){

+	for(i = 0; i < 128; i++){

 		if(!(csr8r(ctlr, Lsr) & Thre))

 			break;

-		if(uart->op >= uart->oe)

+		if(uart->op >= uart->oe && uartstageoutput(uart) == 0)

 			break;

-		outb(ctlr->io+Thr, *uart->op);

+		outb(ctlr->io+Thr, *(uart->op++));

 	}

 }

--- a/os/pc64/main.c

+++ b/os/pc64/main.c

@@ -96,8 +96,9 @@

 }

 void

-setupdebug(void)

+showconfig(void)

 {

+	showconf();

 	print("kdzero 0x%p confaddr 0x%p apbootstrap 0x%p idtaddr 0x%p\n"

 		"\tcpu0mach 0x%p cpu0sp 0x%p cpu0gdt 0x%p\n"

 		"\tcpu0pml4 0x%p cpu0pdp 0x%p  cpu0pd 0x%p\n"

@@ -126,7 +127,7 @@

 	quotefmtinstall();

 	screeninit();

 	print("\nInferno release built at %lud\n", kerndate);

-	setupdebug();

+	showconfig();

 	cpuidentify();

 	meminit0();			/* builds the memmap */

 	archinit();

--- a/os/port/devuart.c

+++ b/os/port/devuart.c

@@ -628,12 +628,9 @@

 {

 	int n;

-	if(p->op < p->oe)

-		return p->oe - p->op;

 	n = qconsume(p->oq, p->ostage, Stagesize);

-	if(n <= 0){

+	if(n <= 0)

 		return 0;

-	}

 	p->op = p->ostage;

 	p->oe = p->ostage + n;

 	return n;

--- a/os/port/portfns.h

+++ b/os/port/portfns.h

@@ -269,6 +269,7 @@

 void		setmalloctag(void*, uintptr);

 int		setpri(int);

 void		setrealloctag(void*, uintptr);

+void	showconf(void);

 char*		skipslash(char*);

 void		sleep(Rendez*, int(*)(void*), void*);

 void*		smalloc(uintptr);