Add initial piece for softraid(4) support on arm64

arm64 is the only currently supported OpenBSD platform which both
a) supports booting off root on softraid(4) (kernel and bootloader) and
b) is an EFI platform (as far as installboot(8) is concerned).

Currently, installboot treats softraid root volumes as regular devices,
ignoring ignores chunk devices completely.

Teach installboot the first bits of softraid support for EFI:
installing the single-stage boot loader on chunks rather than the volume.

Copy over sparc64's softraid stage-1 code as-is and make its stage-2 a NOOP:

	# ./obj/installboot -v sd4
	Using / as root
	installing bootstrap on /dev/rsd4c
	using first-stage /usr/mdec/BOOTAA64.EFI
	sd4: softraid volume with 1 disk(s)
	sd0a: installing boot blocks on /dev/rsd0c
	copying /usr/mdec/BOOTAA64.EFI to /tmp/installboot.KuBD4zkfpM/efi/boot/bootaa64.efi
	writing /tmp/installboot.KuBD4zkfpM/efi/boot/startup.nsh

arm64 miniroot fits and boots with this.

OK stsp


As of now, EFI partitions must still be created manually as installboot's
'-p' does not support softraid at all (next missing piece for root on
softraid on arm64 installations to work out-of-the-box).

2 files changed, 92 insertions, 1 deletions

diff --git a/usr.sbin/installboot/Makefile b/usr.sbin/installboot/Makefile
index 0d2d845d710..c4c5ea3788a 100644
--- a/usr.sbin/installboot/Makefile
+++ b/usr.sbin/installboot/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.24 2022/02/03 10:21:13 visa Exp $
+#	$OpenBSD: Makefile,v 1.25 2022/08/15 17:06:43 kn Exp $
 
 PROG=		installboot
 SRCS=		installboot.c util.c
@@ -16,6 +16,10 @@ SRCS += i386_installboot.c
 SRCS += i386_nlist.c
 SRCS += i386_softraid.c
 .elif ${MACHINE} == "armv7" || ${MACHINE} == "arm64" || ${MACHINE} == "riscv64"
+.  if ${MACHINE} == "arm64"
+CFLAGS += -DSOFTRAID
+SRCS += efi_softraid.c
+.  endif
 SRCS += efi_installboot.c
 .elif ${MACHINE} == "hppa"
 CFLAGS += -DBOOTSTRAP
diff --git a/usr.sbin/installboot/efi_softraid.c b/usr.sbin/installboot/efi_softraid.c
new file mode 100644
index 00000000000..259df18b184
--- /dev/null
+++ b/usr.sbin/installboot/efi_softraid.c
@@ -0,0 +1,87 @@
+/*	$OpenBSD: efi_softraid.c,v 1.1 2022/08/15 17:06:43 kn Exp $	*/
+/*
+ * Copyright (c) 2012 Joel Sing <jsing@openbsd.org>
+ * Copyright (c) 2022 Klemens Nanni <kn@openbsd.org>
+ *
+ * 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.
+ */
+
+#include <sys/types.h>
+#include <sys/disklabel.h>
+#include <sys/ioctl.h>
+
+#include <dev/biovar.h>
+#include <dev/softraidvar.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <util.h>
+#include <unistd.h>
+
+#include "installboot.h"
+
+void
+sr_install_bootblk(int devfd, int vol, int disk)
+{
+	struct bioc_disk bd;
+	char *realdev;
+	int diskfd;
+	char part;
+
+	/* Get device name for this disk/chunk. */
+	memset(&bd, 0, sizeof(bd));
+	bd.bd_volid = vol;
+	bd.bd_diskid = disk;
+	if (ioctl(devfd, BIOCDISK, &bd) == -1)
+		err(1, "BIOCDISK");
+
+	/* Check disk status. */
+	if (bd.bd_status != BIOC_SDONLINE && bd.bd_status != BIOC_SDREBUILD) {
+		fprintf(stderr, "softraid chunk %u not online - skipping...\n",
+		    disk);
+		return;
+	}
+
+	if (strlen(bd.bd_vendor) < 1)
+		errx(1, "invalid disk name");
+	part = bd.bd_vendor[strlen(bd.bd_vendor) - 1];
+	if (part < 'a' || part >= 'a' + MAXPARTITIONS)
+		errx(1, "invalid partition %c\n", part);
+	bd.bd_vendor[strlen(bd.bd_vendor) - 1] = '\0';
+
+	/* Open device. */
+	if ((diskfd = opendev(bd.bd_vendor, (nowrite ? O_RDONLY : O_RDWR),
+	    OPENDEV_PART, &realdev)) == -1)
+		err(1, "open: %s", realdev);
+
+	if (verbose)
+		fprintf(stderr, "%s%c: installing boot blocks on %s\n",
+		    bd.bd_vendor, part, realdev);
+
+	/* Write boot blocks to device. */
+	md_installboot(diskfd, realdev);
+
+	close(diskfd);
+}
+
+void
+sr_install_bootldr(int devfd, char *dev)
+{
+	/*
+	 * EFI platforms have a single stage bootstrap.
+	 * sr_install_bootblk() installs it on each softraid chunk.
+	 * The softraid volume does not require any bootstrap code.
+	 */
+}