Index: sys/arch/powerpc/booke/booke_pmap.c
===================================================================
RCS file: /cvsroot/src/sys/arch/powerpc/booke/booke_pmap.c,v
retrieving revision 1.38
diff -u -p -r1.38 booke_pmap.c
--- sys/arch/powerpc/booke/booke_pmap.c	17 Apr 2023 06:46:53 -0000	1.38
+++ sys/arch/powerpc/booke/booke_pmap.c	24 Sep 2024 07:27:35 -0000
@@ -356,8 +360,8 @@ void
 pmap_copy_page(paddr_t src, paddr_t dst)
 {
 	const size_t line_size = curcpu()->ci_ci.dcache_line_size;
-	vaddr_t src_va = pmap_md_map_poolpage(src, NBPG);
-	vaddr_t dst_va = pmap_md_map_poolpage(dst, NBPG);
+	register vaddr_t src_va __asm("r20") = pmap_md_map_poolpage(src, NBPG);
+	register vaddr_t dst_va __asm("r21") = pmap_md_map_poolpage(dst, NBPG);
 	const vaddr_t end = src_va + PAGE_SIZE;
 
 	PMAP_COUNT(copied_pages);
@@ -372,14 +376,12 @@ pmap_copy_page(paddr_t src, paddr_t dst)
 		     src_va += 32, dst_va += 32, i += 32) {
 			register_t tmp;
 			__asm __volatile(
-				"mr	%[tmp],31"	"\n\t"
-				"lmw	24,0(%[src])"	"\n\t"
-				"stmw	24,0(%[dst])"	"\n\t"
-				"mr	31,%[tmp]"	"\n\t"
+				"lmw	22,0(%[src])"	"\n\t"
+				"stmw	22,0(%[dst])"	"\n\t"
 			    : [tmp] "=&r"(tmp)
 			    : [src] "b"(src_va), [dst] "b"(dst_va)
-			    : "r24", "r25", "r26", "r27",
-			      "r28", "r29", "r30", "memory");
+			    : "r22", "r23", "r24", "r25",
+			      "r26", "r27", "r28", "r29", "memory");
 		}
 	}
 	pmap_md_unmap_poolpage(src_va, NBPG);