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+###############################################################################
+#
+# 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
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