Contribution of PowerPC port.

src/ppc/cpu-ppc.cc

+// Copyright 2006-2009 the V8 project authors. All rights reserved.
+//
+// Copyright IBM Corp. 2012, 2013. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// CPU specific code for ppc independent of OS goes here.
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_PPC
+
+#include "src/assembler.h"
+#include "src/macro-assembler.h"
+#include "src/simulator.h"  // for cache flushing.
+
+namespace v8 {
+namespace internal {
+
+void CpuFeatures::FlushICache(void* buffer, size_t size) {
+  // Nothing to do flushing no instructions.
+  if (size == 0) {
+    return;
+  }
+
+#if defined (USE_SIMULATOR)
+  // Not generating PPC instructions for C-code. This means that we are
+  // building an PPC emulator based target.  We should notify the simulator
+  // that the Icache was flushed.
+  // None of this code ends up in the snapshot so there are no issues
+  // around whether or not to generate the code when building snapshots.
+  Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), buffer, size);
+#else
+
+  const int kCacheLineSize = CpuFeatures::cache_line_size();
+  intptr_t mask = kCacheLineSize - 1;
+  byte *start = reinterpret_cast<byte *>(
+                 reinterpret_cast<intptr_t>(buffer) & ~mask);
+  byte *end = static_cast<byte *>(buffer) + size;
+  for (byte *pointer = start; pointer < end; pointer += kCacheLineSize) {
+    __asm__(
+      "dcbf 0, %0  \n"  \
+      "sync        \n"  \
+      "icbi 0, %0  \n"  \
+      "isync       \n"
+      : /* no output */
+      : "r" (pointer));
+  }
+
+#endif  // USE_SIMULATOR
+}
+
+} }  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_PPC