1 files changed, 52 insertions, 0 deletions
diff --git a/sys/arch/i386/include/codepatch.h b/sys/arch/i386/include/codepatch.h
new file mode 100644
index 00000000000..cf9ad7abaca
--- /dev/null
+++ b/sys/arch/i386/include/codepatch.h
@@ -0,0 +1,52 @@
+/*      $OpenBSD: codepatch.h,v 1.1 2015/04/19 06:27:17 sf Exp $    */
+/*
+ * Copyright (c) 2014-2015 Stefan Fritsch <sf@sfritsch.de>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _MACHINE_CODEPATCH_H_
+#define _MACHINE_CODEPATCH_H_
+
+#include <machine/param.h>
+
+#ifndef _LOCORE
+
+void *codepatch_maprw(vaddr_t *nva, vaddr_t dest);
+void codepatch_unmaprw(vaddr_t nva);
+void codepatch_fill_nop(void *caddr, uint16_t len);
+void codepatch_nop(uint16_t tag);
+void codepatch_replace(uint16_t tag, void *code, size_t len);
+void codepatch_call(uint16_t tag, void *func);
+
+#endif /* !_LOCORE */
+
+/*
+ * Mark the start of some code snippet to be patched.
+ */
+#define	CODEPATCH_START	998:
+/*
+ * Mark the end of some code to be patched, and assign the given tag.
+ */
+#define	CODEPATCH_END(tag)			 \
+	999:					 \
+	.section .codepatch, "a"		;\
+	.int (998b - KERNBASE)			;\
+	.short (999b - 998b)			;\
+	.short tag				;\
+	.previous
+
+#define CPTAG_STAC		1
+#define CPTAG_CLAC		2
+
+#endif /* _MACHINE_CODEPATCH_H_ */