From df3046a19769349875443e00f396e021a4e2a890 Mon Sep 17 00:00:00 2001
From: Jasper Lievisse Adriaanse <jasper@cvs.openbsd.org>
Date: Mon, 8 Apr 2013 09:42:27 +0000
Subject: allow octeon to find it's root device, based on the flags passed by
 U-Boot. The ${bootcmd} needs to be something like 'bootoctlinux
 root=/dev/octcf0'.

This will be temporary untill we have proper bootblocks, but for now, this (in combination)
with an upcoming installer diff allows my CAM-0100 to autoboot straight of the disk, without
having to load the kernel via TFTP.

ok bcallah@ yasuoka@
---
 sys/arch/octeon/octeon/autoconf.c | 29 +++++++++++++++++++++--
 sys/arch/octeon/octeon/machdep.c  | 48 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 74 insertions(+), 3 deletions(-)

diff --git a/sys/arch/octeon/octeon/autoconf.c b/sys/arch/octeon/octeon/autoconf.c
index f5f45e8f201..3a3d081af29 100644
--- a/sys/arch/octeon/octeon/autoconf.c
+++ b/sys/arch/octeon/octeon/autoconf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: autoconf.c,v 1.3 2012/06/17 11:02:32 miod Exp $	*/
+/*	$OpenBSD: autoconf.c,v 1.4 2013/04/08 09:42:26 jasper Exp $	*/
 /*
  * Copyright (c) 2009 Miodrag Vallat.
  *
@@ -24,11 +24,13 @@
 #include <machine/autoconf.h>
 
 extern void dumpconf(void);
+void parse_uboot_root(void);
 
 int	cold = 1;
 struct device *bootdv = NULL;
 char    bootdev[16];
 enum devclass bootdev_class = DV_DULL;
+extern char uboot_rootdev[];
 
 void
 cpu_configure(void)
@@ -42,6 +44,29 @@ cpu_configure(void)
 	cold = 0;
 }
 
+void
+parse_uboot_root(void)
+{
+	char *p;
+	size_t len;
+
+        /*
+         * Turn the U-Boot root device (root=/dev/octcf0) into a boot device.
+         */
+        p = strrchr(uboot_rootdev, '/');
+        if (p == NULL)
+                return;
+	p++;
+
+	len = strlen(p);
+	if (len <= 2 || len >= sizeof bootdev - 1)
+		return;
+
+	memcpy(bootdev, p, len);
+	bootdev[len] = '\0';
+	bootdev_class = DV_DISK;
+}
+
 void
 diskconf(void)
 {
@@ -62,7 +87,7 @@ device_register(struct device *dev, void *aux)
 	const char *name = dev->dv_xname;
 
 	if (dev->dv_class != bootdev_class)
-		return;	
+		return;
 
 	switch (bootdev_class) {
 	case DV_DISK:
diff --git a/sys/arch/octeon/octeon/machdep.c b/sys/arch/octeon/octeon/machdep.c
index 8051195bca4..07c386aa973 100644
--- a/sys/arch/octeon/octeon/machdep.c
+++ b/sys/arch/octeon/octeon/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.32 2013/04/06 07:53:57 jasper Exp $ */
+/*	$OpenBSD: machdep.c,v 1.33 2013/04/08 09:42:26 jasper Exp $ */
 
 /*
  * Copyright (c) 2009, 2010 Miodrag Vallat.
@@ -95,6 +95,8 @@ vm_map_t phys_map;
 struct boot_desc *octeon_boot_desc;
 struct boot_info *octeon_boot_info;
 
+char uboot_rootdev[OCTEON_ARGV_MAX];
+
 /*
  * safepri is a safe priority for sleep to set for a spin-wait
  * during autoconfiguration or after a panic.
@@ -122,6 +124,9 @@ vaddr_t	mips_init(__register_t, __register_t, __register_t, __register_t);
 boolean_t is_memory_range(paddr_t, psize_t, psize_t);
 void	octeon_memory_init(struct boot_info *);
 int	octeon_cpuspeed(int *);
+static void	process_bootargs(void);
+
+extern void parse_uboot_root(void);
 
 cons_decl(cn30xxuart);
 struct consdev uartcons = cons_init(cn30xxuart);
@@ -375,6 +380,8 @@ mips_init(__register_t a0, __register_t a1, __register_t a2 __unused,
 
 	cpu_cpuspeed = octeon_cpuspeed;
 
+	process_bootargs();
+
 	/*
 	 * Get a console, very early but after initial mapping setup.
 	 */
@@ -555,6 +562,45 @@ octeon_cpuspeed(int *freq)
 	return (0);
 }
 
+
+static void
+process_bootargs(void)
+{
+	int i;
+	extern struct boot_desc *octeon_boot_desc;
+
+	/*
+	 * The kernel is booted via a bootoctlinux command. Thus we need to skip
+	 * argv[0] when we start to decode the boot arguments (${bootargs}).
+	 * Note that U-Boot doesn't pass us anything by default, we need
+	 * explicitly pass the rootdevice.
+	 */
+	for (i = 1; i < octeon_boot_desc->argc; i++ ) {
+		const char *arg =
+		    (const char*)PHYS_TO_CKSEG0(octeon_boot_desc->argv[i]);
+
+		if (arg == NULL)
+			continue;
+
+#ifdef DEBUG
+		printf("boot_desc->argv[%d] = %s\n",
+		       i, PHYS_TO_CKSEG0(octeon_boot_desc->argv[i]));
+#endif
+
+		/*
+		 * XXX: We currently only expect one other argument,
+		 * argv[1], root=ROOTDEV.
+		 */
+		if (strncmp(arg, "root=", 5) == 0) {
+			if (*uboot_rootdev == '\0') {
+				strlcpy(uboot_rootdev, arg,
+					sizeof(uboot_rootdev));
+				parse_uboot_root();
+                        }
+		}
+	}
+}
+
 /*
  * Machine dependent system variables.
  */
-- 
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