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authorJason Lowe-Power <jason@lowepower.com>2017-07-25 13:12:27 -0500
committerJason Lowe-Power <jason@lowepower.com>2018-03-15 20:45:34 +0000
commit1723e8ecc28ee8b55c9b8008456726f60ea8fcc2 (patch)
tree62ebda1688fa43b10c586744b53aae0eb54ca02a
parent65d0a6b3accbb168300d9c4f18845e6fb8a96e77 (diff)
downloadgem5-1723e8ecc28ee8b55c9b8008456726f60ea8fcc2.tar.xz
sim-se: Add /sys/devices/system/cpu/online file
Add the special file /sys/devices/system/cpu/online to the files that gem5 knows how to handle in SE mode. This file lists the CPUs that are active. For instance, in an 8 CPU system it is the following: 0-7 This implementation simply returns a file that is 0-%d where %d is the current number of thread contexts. This file is required for C++11 threads with gcc 4.8 and above. Change-Id: I0b566f77e75e9eca480509814d0fd038a231b940 Signed-off-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-on: https://gem5-review.googlesource.com/8902 Reviewed-by: Gabe Black <gabeblack@google.com> Reviewed-by: Brandon Potter <Brandon.Potter@amd.com> Maintainer: Brandon Potter <Brandon.Potter@amd.com>
-rw-r--r--src/kern/linux/linux.cc10
-rw-r--r--src/kern/linux/linux.hh1
2 files changed, 11 insertions, 0 deletions
diff --git a/src/kern/linux/linux.cc b/src/kern/linux/linux.cc
index bd0b4d09a..d571b81a1 100644
--- a/src/kern/linux/linux.cc
+++ b/src/kern/linux/linux.cc
@@ -55,6 +55,9 @@ Linux::openSpecialFile(std::string path, Process *process,
} else if (path.compare(0, 11, "/etc/passwd") == 0) {
data = Linux::etcPasswd(process, tc);
matched = true;
+ } else if (path.compare(0, 30, "/sys/devices/system/cpu/online") == 0) {
+ data = Linux::cpuOnline(process, tc);
+ matched = true;
}
if (matched) {
@@ -87,3 +90,10 @@ Linux::etcPasswd(Process *process, ThreadContext *tc)
return csprintf("gem5-user:x:1000:1000:gem5-user,,,:%s:/bin/bash\n",
process->getcwd());
}
+
+std::string
+Linux::cpuOnline(Process *process, ThreadContext *tc)
+{
+ return csprintf("0-%d\n",
+ tc->getSystemPtr()->numContexts() - 1);
+}
diff --git a/src/kern/linux/linux.hh b/src/kern/linux/linux.hh
index b24ee3895..a1df99467 100644
--- a/src/kern/linux/linux.hh
+++ b/src/kern/linux/linux.hh
@@ -227,6 +227,7 @@ class Linux : public OperatingSystem
ThreadContext *tc);
static std::string procMeminfo(Process *process, ThreadContext *tc);
static std::string etcPasswd(Process *process, ThreadContext *tc);
+ static std::string cpuOnline(Process *process, ThreadContext *tc);
// For futex system call
static const unsigned TGT_FUTEX_WAIT = 0;