Index: head/sys/boot/efi/loader/copy.c
===================================================================
--- head/sys/boot/efi/loader/copy.c
+++ head/sys/boot/efi/loader/copy.c
@@ -41,7 +41,7 @@
 #define	EFI_STAGING_SIZE	48
 #endif
 
-#define	STAGE_PAGES	((EFI_STAGING_SIZE) * 1024 * 1024 / 4096)
+#define	STAGE_PAGES	EFI_SIZE_TO_PAGES((EFI_STAGING_SIZE) * 1024 * 1024)
 
 EFI_PHYSICAL_ADDRESS	staging, staging_end;
 int			stage_offset_set = 0;
@@ -59,7 +59,7 @@
 		    (unsigned long)(status & EFI_ERROR_MASK));
 		return (status);
 	}
-	staging_end = staging + STAGE_PAGES * 4096;
+	staging_end = staging + STAGE_PAGES * EFI_PAGE_SIZE;
 
 #if defined(__aarch64__) || defined(__arm__)
 	/*
@@ -132,7 +132,7 @@
 
 	src = (uint64_t *)staging;
 	dst = (uint64_t *)(staging - stage_offset);
-	last = (uint64_t *)(staging + STAGE_PAGES * EFI_PAGE_SIZE);
+	last = (uint64_t *)staging_end;
 
 	while (src < last)
 		*dst++ = *src++;