From: Olaf Hering <olh@suse.de>
Date: Sat, 29 Oct 2005 00:46:50 +0000 (-0700)
Subject: [PATCH] ppc64 boot: print firmware provided stackpointer
X-Git-Tag: v2.6.15-rc1~59^2~30
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e658118faa9faf71f8a8295cdaeb7ca71c04672;p=linux-2.6

[PATCH] ppc64 boot: print firmware provided stackpointer

Show firmware provided stackpointer during boot.

This helps to find the "taboo" areas on the various boards.  claim tends to
fail for these memory areas, but some jokers return success anyway.

Use %p to print the load address, its a pointer.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/ppc64/boot/crt0.S b/arch/ppc64/boot/crt0.S
index 8bfdeaf3be..9cc4422639 100644
--- a/arch/ppc64/boot/crt0.S
+++ b/arch/ppc64/boot/crt0.S
@@ -54,5 +54,6 @@ clear_caches:
 	sync
 	isync
 
+	mr	r6,r1
 	b	start
 
diff --git a/arch/ppc64/boot/main.c b/arch/ppc64/boot/main.c
index 3304ed34c4..c1dc876bcc 100644
--- a/arch/ppc64/boot/main.c
+++ b/arch/ppc64/boot/main.c
@@ -131,7 +131,7 @@ static unsigned long try_claim(unsigned long size)
 	return addr;
 }
 
-void start(unsigned long a1, unsigned long a2, void *promptr)
+void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
 {
 	unsigned long i;
 	int len;
@@ -151,7 +151,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
 	if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
 		exit();
 
-	printf("\n\rzImage starting: loaded at 0x%lx\n\r", (unsigned long) _start);
+	printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
 
 	/*
 	 * The first available claim_base must be above the end of the