1 files changed, 68 insertions, 0 deletions
diff --git a/usr.sbin/btxld/btx.h b/usr.sbin/btxld/btx.h
new file mode 100644
index 000000000000..6e101b89d933
--- /dev/null
+++ b/usr.sbin/btxld/btx.h
@@ -0,0 +1,68 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 1998 Robert Nordier
+ * All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef _BTX_H_
+#define _BTX_H_
+
+#include <sys/types.h>
+
+#define BTX_PGSIZE	0x1000		/* Page size */
+#define BTX_PGBASE	0x5000		/* Start of page tables */
+#define BTX_MAXCWR	0x3bc		/* Max. btx_pgctl adjustment */
+
+/*
+ * BTX image header.
+ */
+struct btx_hdr {
+    uint8_t	btx_machid;		/* Machine ID */
+    uint8_t	btx_hdrsz;		/* Header size */
+    uint8_t	btx_magic[3];		/* Magic */
+    uint8_t	btx_majver;		/* Major version */
+    uint8_t	btx_minver;		/* Minor version */
+    uint8_t	btx_flags;		/* Flags */
+    uint16_t	btx_pgctl;		/* Paging control */
+    uint16_t	btx_textsz;		/* Text size */
+    uint32_t	btx_entry;		/* Client entry address */
+};
+
+/* btx_machid */
+#define BTX_I386	0xeb		/* Intel i386 or compatible */
+
+/* btx_magic */
+#define BTX_MAG0	'B'
+#define BTX_MAG1	'T'
+#define BTX_MAG2	'X'
+
+/* btx_flags */
+#define BTX_MAPONE	0x80		/* Start mapping at page 1 */
+
+#define BTX_MAPPED(btx) (((btx).btx_pgctl | (BTX_PGSIZE / 4 - 1)) + 1)
+#define BTX_ORIGIN(btx) (BTX_PGBASE + BTX_MAPPED(btx) * 4)
+#define BTX_ENTRY(btx)	(BTX_ORIGIN(btx) + 2 + (btx).btx_hdrsz)
+
+#endif /* !_BTX_H_ */