From 9701a97e3f68c2a5f0d887da31fef76199a90d1d Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 21 May 2015 15:19:41 +0200
Subject: benchmarking hack

---
 linuxboot.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/linuxboot.c b/linuxboot.c
index 7ce07bc..cc64811 100644
--- a/linuxboot.c
+++ b/linuxboot.c
@@ -1,5 +1,6 @@
 #include "bios.h"
 #include "linuxboot.h"
+#include "ioport.h"
 #include "string.h"
 #include "stdio.h"
 
@@ -110,6 +111,12 @@ bool parse_bzimage(struct linuxboot_args *args)
 void boot_bzimage(struct linuxboot_args *args)
 {
 	memcpy(args->setup_addr, args->header, sizeof(args->header));
+#ifdef BENCHMARK_HACK
+	/* Exit just before getting to vmlinuz, so that it is easy
+	 * to time/profile the firmware.
+	 */
+	outb(0xf4, 1);
+#endif
 	asm volatile(
 	    "ljmp $0x18, $pm16_boot_linux - 0xf0000"
 	    : :
-- 
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