Add a pseudo-driver to "kexec" an OpenBSD/powerpc64 kernel. Heavily

based on the octboot driver that we use for octeon.  To be used in the
bootloader kernel.

2 files changed, 44 insertions, 0 deletions

diff --git a/sys/arch/powerpc64/include/conf.h b/sys/arch/powerpc64/include/conf.h
index 62f960b0155..28f660fe733 100644
--- a/sys/arch/powerpc64/include/conf.h
+++ b/sys/arch/powerpc64/include/conf.h
@@ -7,10 +7,18 @@ cdev_decl(mm);
 cdev_decl(opalcons);
 
 /* open, close, ioctl */
+#define cdev_kexec_init(c,n) { \
+	dev_init(c,n,open), dev_init(c,n,close), (dev_type_read((*))) enodev, \
+	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
+	(dev_type_stop((*))) nullop, 0, selfalse, \
+	(dev_type_mmap((*))) enodev }
+
+/* open, close, ioctl */
 #define cdev_openprom_init(c,n) { \
 	dev_init(c,n,open), dev_init(c,n,close), (dev_type_read((*))) enodev, \
 	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
 	(dev_type_stop((*))) nullop, 0, selfalse, \
 	(dev_type_mmap((*))) enodev }
 
+cdev_decl(kexec);
 cdev_decl(openprom);
diff --git a/sys/arch/powerpc64/include/kexec.h b/sys/arch/powerpc64/include/kexec.h
new file mode 100644
index 00000000000..ca018e00b0b
--- /dev/null
+++ b/sys/arch/powerpc64/include/kexec.h
@@ -0,0 +1,36 @@
+/*	$OpenBSD: kexec.h,v 1.1 2020/07/16 19:37:58 kettenis Exp $	*/
+
+/*
+ * Copyright (c) 2019-2020 Visa Hankala
+ *
+ * Permission to use, copy, modify, and/or 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_KEXEC_H_
+#define _MACHINE_KEXEC_H_
+
+#include <sys/ioccom.h>
+
+#define KEXEC_MAX_ARGS	8	/* maximum number of boot arguments */
+
+struct kexec_args {
+	char		*kimg;		/* kernel image buffer */
+	size_t		 klen;		/* size of kernel image */
+	char		*argv[KEXEC_MAX_ARGS];
+					/* kernel boot arguments */
+};
+
+#define KIOC_KEXEC		_IOW('K', 1, struct kexec_args)
+#define KIOC_GETBOOTDUID	_IOW('K', 2, char[8])
+
+#endif /* _MACHINE_KEXEC_H_ */