1 files changed, 72 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/profile-low.S b/arch/mn10300/kernel/profile-low.S
new file mode 100644
index 0000000..94ffac1
--- /dev/null
+++ b/arch/mn10300/kernel/profile-low.S
@@ -0,0 +1,72 @@
+###############################################################################
+#
+# Fast profiling interrupt handler
+#
+# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+# Written by David Howells (dhowells@redhat.com)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public Licence
+# as published by the Free Software Foundation; either version
+# 2 of the Licence, or (at your option) any later version.
+#
+###############################################################################
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/smp.h>
+#include <asm/intctl-regs.h>
+#include <asm/timer-regs.h>
+
+#define pi break
+
+	.balign	4
+counter:
+	.long	-1
+
+###############################################################################
+#
+# Profiling interrupt entry point
+# - intended to run at interrupt priority 1
+#
+###############################################################################
+ENTRY(profile_handler)
+	movm	[d2,d3,a2],(sp)
+
+	# ignore userspace
+	mov	(12,sp),d2
+	and	EPSW_nSL,d2
+	bne	out
+
+	# do nothing if there's no buffer
+	mov	(prof_buffer),a2
+	and	a2,a2
+	beq	out
+	or	0x20000000,a2
+
+	# calculate relative position in text segment
+	mov	(16,sp),d2
+	sub	_stext,d2
+	mov	(prof_shift),d3
+	lsr	d3,d2
+	mov	(prof_len),d3
+	cmp	d3,d2
+	bcc	outside_text
+
+	# increment the appropriate profile bucket
+do_inc:
+	asl2	d2
+	mov	(a2,d2),d3
+	inc	d3
+	mov	d3,(a2,d2)
+out:
+	mov	GxICR_DETECT,d2
+	movbu	d2,(TM11ICR)		# ACK the interrupt
+	movbu	(TM11ICR),d2
+	movm	(sp),[d2,d3,a2]
+	rti
+
+outside_text:
+	sub	1,d3
+	mov	d3,d2
+	bra	do_inc