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added mp table override

--- a/sys/src/9/pc/mp.c

+++ b/sys/src/9/pc/mp.c

@@ -154,6 +154,8 @@

 		return 0;

 	apic = &mpapic[apicno];

+	if(apic->flags != 0)

+		print("mkioapic: APIC ID conflict at %d\n", p->apicno);

 	apic->type = PcmpIOAPIC;

 	apic->apicno = apicno;

 	apic->addr = va;

@@ -484,6 +486,46 @@

 	nvramwrite(0x0F, 0x00);

 }

+static void

+dumpmp(uchar *p, uchar *e)

+{

+	int i;

+

+	for(i = 0; p < e; p++) {

+		if((i % 16) == 0) print("*mp%d=", i/16);

+		print("%.2x ", *p);

+		if((++i % 16) == 0) print("\n");

+	}

+	if((i % 16) != 0) print("\n");

+}

+

+static void

+mpoverride(uchar** newp, uchar** e)

+{

+	int size, i, j;

+	char buf[20];

+	uchar* p;

+	char* s;

+	

+	size = atoi(getconf("*mp"));

+	if(size == 0) panic("mpoverride: invalid size in *mp");

+	*newp = p = malloc(size);

+	if(p == nil) panic("mpoverride: can't allocate memory");

+	*e = p + size;

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

+		snprint(buf, sizeof buf, "*mp%d", i);

+		s = getconf(buf);

+		if(s == nil) break;

+		while(*s){

+			j = strtol(s, &s, 16);

+			if(*s && *s != ' ' || j < 0 || j > 0xff) panic("mpoverride: invalid entry in %s", buf);

+			if(p >= *e) panic("mpoverride: overflow in %s", buf);

+			*p++ = j;

+		}

+	}

+	if(p != *e) panic("mpoverride: size doesn't match");

+}

+

 void

 mpinit(void)

 {

@@ -518,6 +560,10 @@

 	 */

 	p = ((uchar*)pcmp)+sizeof(PCMP);

 	e = ((uchar*)pcmp)+pcmp->length;

+	if(getconf("*dumpmp") != nil)

+		dumpmp(p, e);

+	if(getconf("*mp") != nil)

+		mpoverride(&p, &e);

 	while(p < e) switch(*p){

 	default:

@@ -683,7 +729,7 @@

 			break;

 	}

 	if(bus == nil){

-		print("ioapicirq: can't find bus type %d\n", type);

+		print("ioapicirq: can't find bus type %d, number %d\n", type, bno);

 		return -1;

 	}

-- 

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