adralloc() now returns the pa of the allocated memory,
else ~0ull on error.  before it returned 0 on error, which
means that any allocation of address 0 (a right proper
physical address) could have been confused with an error.

Reference: /n/atom/patch/applied/adralloc0
Date: Sat Mar  8 04:30:56 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/adr.c	Sat Mar  8 04:29:16 2014
+++ /sys/src/nix/k10/adr.c	Sat Mar  8 04:29:17 2014
@@ -290,23 +290,25 @@
 			trymerge(a-1, a);
 		return base;
 	}
-	return 0;
+	return ~0ull;
 }
 
 uintmem
 adralloc(uintmem base, uintmem len, int align, int type, int use, uint memflags)
 {
+	uintmem r;
+
 	DBG("adralloc: %#P:%#P, %s flags %#ux\n", base, len, tnam(type), memflags);
 	lock(&adr);
-	base = intadralloc(base, len, align, type, use, Cnone, memflags);
+	r = intadralloc(base, len, align, type, use, Cnone, memflags);
 	unlock(&adr);
 
-	if(base == 0){
+	if(r == ~0ull){
 		print("adralloc: fail %#P len %#P type %s use %s align %d flags %#ux from %#p\n",
 			base, len, tnam(type), uname[use], align, memflags, getcallerpc(&base));
-		adrdump();
+	//	adrdump();
 	}
-	return base;
+	return r;
 }
 
 void
@@ -375,9 +377,9 @@
 		if(b >= e)
 			continue;
 
-		print("adrsetcolor: split range [%#P %#P) ⊂ [%#P %#P)\n",
+		DBG("adrsetcolor: split range [%#P %#P) ⊂ [%#P %#P)\n",
 			b, e, a->base, aend);
-		if(intadralloc(b, e-b, 0, a->type, a->use, color, a->memflags) == 0)
+		if(intadralloc(b, e-b, 0, a->type, a->use, color, a->memflags) == ~0ull)
 			print("adrsetcolor: no such memory  [%#P %#P) ⊂ [%#P %#P)\n",
 				b, e, a->base, aend);
 	}
@@ -402,7 +404,7 @@
 	else{
 		m->type = type;
 		unlock(&adr);
-		adralloc(base, len, 0, type, use, 0);
+		intadralloc(base, len, 0, type, use, color, 0);
 	}
 }
 
@@ -474,7 +476,7 @@
 
 	/* can pick any pa; expect INIMAP */
 	pa = adralloc(0, sys->vmend - sys->vmunmapped, 0, Amemory, Mkpage, 0);
-	if(pa == 0)
+	if(pa == ~0ull)
 		panic("adr: insufficient contiguous memory for kernel %#P", pa);
 	print("pa %#P (%#P %#P)\n", pa, sys->vmend, sys->vmunmapped);
 
--- /sys/src/nix/k10/mmu.c	Sat Mar  8 04:29:19 2014
+++ /sys/src/nix/k10/mmu.c	Sat Mar  8 04:29:20 2014
@@ -621,7 +621,7 @@
 	 * only adralloc the actual request.  pci bars can be less than 1 page.
 	 * take it on faith that they don't overlap.
 	 */
-	if(pa == 0 || adralloc(pa+o, size, 0, -1, Mvmap, flags) == 0){
+	if(pa == 0 || adralloc(pa+o, size, 0, -1, Mvmap, flags) == ~0ull){
 		print("vmapflags(0, %lud) pc=%#p\n", size, getcallerpc(&pa));
 		return nil;
 	}
@@ -683,7 +683,7 @@
 		return nil;
 
 	if(pa+sz < 1ull*MiB)
-		return KADDR(pa);
+		return KADDR(pa+o);
 	if(pa < 1ull*MiB)
 		return nil;
 	for(p = pa; p < pa+sz; p += PGSZ){
--- /sys/src/nix/k10/screen.c	Sat Mar  8 04:29:21 2014
+++ /sys/src/nix/k10/screen.c	Sat Mar  8 04:29:22 2014
@@ -129,7 +129,7 @@
 	 */
 	size = ROUNDUP(size, PGSZ);
 	scr->paddr = adralloc(0, size, PGSZ, Amemory, Mfree, 0);
-	if(scr->paddr == 0)
+	if(scr->paddr == ~0ull)
 		return -1;
 	if(scr->paddr > 0xffffffffull)
 		print("screen mapped high %#P\n", scr->paddr);