Revert "Detect cache line size on Linux for PPC hosts."

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 3435 matching lines @@
   int stack_passed_arguments =
       CalculateStackPassedWords(num_reg_arguments, num_double_arguments);
   int stack_space = kNumRequiredStackFrameSlots + stack_passed_arguments;
   if (ActivationFrameAlignment() > kPointerSize) {
     LoadP(sp, MemOperand(sp, stack_space * kPointerSize));
   } else {
     addi(sp, sp, Operand(stack_space * kPointerSize));
   }
 }
 
+void MacroAssembler::FlushICache(Register address, size_t size,
+                                 Register scratch) {
+  if (CpuFeatures::IsSupported(INSTR_AND_DATA_CACHE_COHERENCY)) {
+    sync();
+    icbi(r0, address);
+    isync();
+    return;
+  }
+
+  Label done;
+
+  dcbf(r0, address);
+  sync();
+  icbi(r0, address);
+  isync();
+
+  // This code handles ranges which cross a single cacheline boundary.
+  // scratch is last cacheline which intersects range.
+  const int kCacheLineSizeLog2 = WhichPowerOf2(CpuFeatures::cache_line_size());
+
+  DCHECK(size > 0 && size <= (size_t)(1 << kCacheLineSizeLog2));
+  addi(scratch, address, Operand(size - 1));
+  ClearRightImm(scratch, scratch, Operand(kCacheLineSizeLog2));
+  cmpl(scratch, address);
+  ble(&done);
+
+  dcbf(r0, scratch);
+  sync();
+  icbi(r0, scratch);
+  isync();
+
+  bind(&done);
+}
 
 void MacroAssembler::DecodeConstantPoolOffset(Register result,
                                               Register location) {
   Label overflow_access, done;
   DCHECK(!AreAliased(result, location, r0));
 
   // Determine constant pool access type
   // Caller has already placed the instruction word at location in result.
   ExtractBitRange(r0, result, 31, 26);
   cmpi(r0, Operand(ADDIS >> 26));
@@ skipping 1164 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC