VBU: dcbz cache lines after code image to ensure they are in the L3.

2 files changed, 17 insertions, 0 deletions

diff --git a/src/include/arch/ppc.H b/src/include/arch/ppc.H
index 003f804a3..d5ad34d9f 100644
--- a/src/include/arch/ppc.H
+++ b/src/include/arch/ppc.H
@@ -165,6 +165,13 @@ inline void dcbf(void* _ptr)
 }
 
 ALWAYS_INLINE
+inline void dcbz(void* _ptr)
+{
+    register void* ptr = _ptr;
+    asm volatile("dcbz 0, %0" : : "b" (ptr) : "memory");
+}
+
+ALWAYS_INLINE
 inline void icbi(void* _ptr)
 {
     register void* ptr = _ptr;
diff --git a/src/kernel/kernel.C b/src/kernel/kernel.C
index dc073631e..f39290a09 100644
--- a/src/kernel/kernel.C
+++ b/src/kernel/kernel.C
@@ -10,6 +10,7 @@
 #include <kernel/taskmgr.H>
 #include <kernel/vmmmgr.H>
 #include <kernel/timemgr.H>
+#include <sys/vfs.h>
 
 #include <stdlib.h>
 
@@ -74,6 +75,15 @@ void Kernel::cppBootstrap()
 
 void Kernel::memBootstrap()
 {
+    // Populate L3 cache lines after code space.
+    uint64_t* cache_line = (uint64_t*) VFS_LAST_ADDRESS;
+    uint64_t* end_cache_line = (uint64_t*) VmmManager::FULL_MEM_SIZE;
+    while (cache_line != end_cache_line)
+    {
+        dcbz(cache_line);
+        cache_line++;
+    }
+
     PageManager::init();
     HeapManager::init();
     VmmManager::init();