correctly recognize partitions on devices bigger than 2tb.
reading above 2tb not yet addressed.

Reference: /n/sources/patch/applied/9loadbigpart
Date: Fri Jan 18 20:31:32 CET 2008
Signed-off-by: quanstro@quanstro.net

--- /sys/src/boot/pc/part.c	Fri Jan 18 20:28:44 2008
+++ /sys/src/boot/pc/part.c	Fri Jan 18 20:28:42 2008
@@ -89,8 +89,8 @@
 		for(i = 1; i < n && unit->npart < SDnpart; i++){
 			if(getfields(line[i], field, 3, ' ') != 3)
 				break;
-			start = strtoul(field[1], 0, 0);
-			end = strtoul(field[2], 0, 0);
+			start = strtoull(field[1], 0, 0);
+			end = strtoull(field[2], 0, 0);
 			if(start >= end || end > unit->sectors)
 				break;
 			sdaddpart(unit, field[0], start, end);
@@ -103,7 +103,7 @@
 {
 	SDpart *p;
 	char *field[4], *line[Npart+1];
-	ulong start, end;
+	uvlong start, end;
 	int i, n;
 	
 	p = sdfindpart(unit, name);
@@ -125,8 +125,8 @@
 			break;
 		if(getfields(line[i], field, 4, ' ') != 4)
 			break;
-		start = strtoul(field[2], 0, 0);
-		end = strtoul(field[3], 0, 0);
+		start = strtoull(field[2], 0, 0);
+		end = strtoull(field[3], 0, 0);
 		if(start >= end || end > unit->sectors)
 			break;
 		sdaddpart(unit, field[1], p->start+start, p->start+end);
--- /sys/src/boot/pc/devsd.c	Fri Jan 18 20:28:52 2008
+++ /sys/src/boot/pc/devsd.c	Fri Jan 18 20:28:50 2008
@@ -32,13 +32,13 @@
 };
 
 void
-sdaddpart(SDunit* unit, char* name, ulong start, ulong end)
+sdaddpart(SDunit* unit, char* name, uvlong start, uvlong end)
 {
 	SDpart *pp;
 	int i, partno;
 
 	if(parttrace)
-		print("add %d %s %s %ld %ld\n", unit->npart, unit->name, name, start, end);
+		print("add %d %s %s %lld %lld\n", unit->npart, unit->name, name, start, end);
 	/*
 	 * Check name not already used
 	 * and look for a free slot.
@@ -73,7 +73,7 @@
 	 * Check there is a free slot and size and extent are valid.
 	 */
 	if(partno == -1 || start > end || end > unit->sectors){
-		print("cannot add %s!%s [%lud,%lud) to disk [0,%lud): %s\n",
+		print("cannot add %s!%s [%llud,%llud) to disk [0,%llud): %s\n",
 			unit->name, name, start, end, unit->sectors, 
 			partno==-1 ? "no free partitions" : "partition boundaries out of range");
 		return;
--- /sys/src/boot/pc/sd.h	Fri Jan 18 20:29:01 2008
+++ /sys/src/boot/pc/sd.h	Fri Jan 18 20:29:00 2008
@@ -8,8 +8,8 @@
 typedef struct SDunit SDunit;
 
 typedef struct SDpart {
-	ulong	start;
-	ulong	end;
+	uvlong	start;
+	uvlong	end;
 	char	name[NAMELEN];
 	char	user[NAMELEN];
 	ulong	perm;
@@ -25,7 +25,7 @@
 //	Rendez	rendez;
 
 //	QLock	ctl;
-	ulong	sectors;
+	uvlong	sectors;
 	ulong	secsize;
 	SDpart*	part;
 	int	npart;			/* of valid partitions */
@@ -122,5 +122,5 @@
 extern long sdbio(SDunit *unit, SDpart *pp, void *a, long len, vlong off);
 void	partition(SDunit*);
 SDpart* sdfindpart(SDunit*, char*);
-void	sdaddpart(SDunit*, char*, ulong, ulong);
+void	sdaddpart(SDunit*, char*, uvlong, uvlong);
 void*	sdmalloc(void*, ulong);
--- /sys/src/boot/pc/lib.h	Fri Jan 18 20:29:11 2008
+++ /sys/src/boot/pc/lib.h	Fri Jan 18 20:29:10 2008
@@ -1,5 +1,3 @@
-#define	offsetof(s, m)	(ulong)(&(((s*)0)->m))
-
 /*
  * functions (possibly) linked in, complete, from libc.
  */
@@ -7,17 +5,17 @@
 /*
  * mem routines
  */
-extern	void*	memccpy(void*, void*, int, ulong);
-extern	void*	memset(void*, int, ulong);
-extern	int	memcmp(void*, void*, ulong);
-extern	void*	memmove(void*, void*, ulong);
-extern	void*	memchr(void*, int, ulong);
+extern	void*	memccpy(void*, void*, int, long);
+extern	void*	memset(void*, int, long);
+extern	int	memcmp(void*, void*, long);
+extern	void*	memmove(void*, void*, long);
+extern	void*	memchr(void*, int, long);
 
 /*
  * string routines
  */
 extern	char*	strcat(char*, char*);
-extern	char*	strchr(char*, int);
+extern	char*	strchr(char*, char);
 extern	int	strcmp(char*, char*);
 extern	char*	strcpy(char*, char*);
 extern	char*	strncat(char*, char*, long);
@@ -99,6 +97,7 @@
 extern	uintptr	getcallerpc(void*);
 extern	long	strtol(char*, char**, int);
 extern	ulong	strtoul(char*, char**, int);
+extern	uvlong	strtoull(char*, char**, int);
 extern	long	end;
 
 #define	NAMELEN	28