From: Joel Hestness <hestness@cs.utexas.edu>
Date: Fri, 13 Aug 2010 00:16:04 +0000 (-0700)
Subject: util/m5/m5.c: ensure readfile() buffer pages are in page table
X-Git-Tag: stable_2012_02_02~974^2
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=73d9a51835f7f9b725b4bec851dac9d6482438e7;p=gem5.git

util/m5/m5.c: ensure readfile() buffer pages are in page table
(and marked dirty, in case that matters) by touching them beforehand
---

diff --git a/util/m5/m5.c b/util/m5/m5.c
index 7747fc0bc..96150f2bb 100644
--- a/util/m5/m5.c
+++ b/util/m5/m5.c
@@ -65,6 +65,11 @@ read_file(int dest_fid)
     int offset = 0;
     int len;
 
+    // Touch all buffer pages to ensure they are mapped in the
+    // page table. This is required in the case of X86_FS, where
+    // Linux does demand paging.
+    memset(buf, 0, sizeof(buf));
+
     while ((len = m5_readfile(buf, sizeof(buf), offset)) > 0) {
         write(dest_fid, buf, len);
         offset += len;