Index: head/stand/i386/libi386/bio.c
===================================================================
--- head/stand/i386/libi386/bio.c	(revision 342625)
+++ head/stand/i386/libi386/bio.c	(revision 342626)
@@ -1,65 +1,67 @@
 /*-
+ * Copyright 2018 Toomas Soome <tsoome@me.com>
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <stand.h>
 #include "libi386.h"
 
 /*
  * The idea is borrowed from pxe.c and zfsimpl.c. The original buffer
  * space in pxe.c was 2x 0x2000. Allocating it from BSS will give us needed
  * memory below 1MB and usable for real mode calls.
  *
  * Note the allocations and frees are to be done in reverse order (LIFO).
  */
 
 static char bio_buffer[BIO_BUFFER_SIZE];
 static char *bio_buffer_end = bio_buffer + BIO_BUFFER_SIZE;
 static char *bio_buffer_ptr = bio_buffer;
 
 void *
 bio_alloc(size_t size)
 {
 	char *ptr;
 
 	ptr = bio_buffer_ptr;
 	if (ptr + size > bio_buffer_end)
 		return (NULL);
 	bio_buffer_ptr += size;
 
 	return (ptr);
 }
 
 void
 bio_free(void *ptr, size_t size)
 {
 
 	if (ptr == NULL)
 		return;
 
 	bio_buffer_ptr -= size;
 	if (bio_buffer_ptr != ptr)
 		panic("bio_alloc()/bio_free() mismatch\n");
 }