MFC revisions 1.152 and 1.159

Use the correct units when handling the hw.physmem tunable.

  Fix a typo in a comment.

sys/sparc64/sparc64/pmap.c

@@ -305,6 +305,7 @@ pmap_bootstrap(vm_offset_t ekva)
 	qsort(mra, sz, sizeof (*mra), mr_cmp);
 	physsz = 0;
 	getenv_quad("hw.physmem", &physmem);
+	physmem = btoc(physmem);
 	for (i = 0, j = 0; i < sz; i++, j += 2) {
 		CTR2(KTR_PMAP, "start=%#lx size=%#lx", mra[i].mr_start,
 		    mra[i].mr_size);
@@ -1007,7 +1008,7 @@ pmap_pinit0(pmap_t pm)
 }
 
 /*
- * Initialize a preallocated and zeroed pmap structure, uch as one in a
+ * Initialize a preallocated and zeroed pmap structure, such as one in a
  * vmspace structure.
  */
 void