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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_ARM64_CPU_ARM64_H_
#define V8_ARM64_CPU_ARM64_H_
#include <stdio.h>
#include "serialize.h"
#include "cpu.h"
namespace v8 {
namespace internal {
// CpuFeatures keeps track of which features are supported by the target CPU.
// Supported features must be enabled by a CpuFeatureScope before use.
class CpuFeatures : public AllStatic {
public:
// Detect features of the target CPU. Set safe defaults if the serializer
// is enabled (snapshots must be portable).
static void Probe();
// Check whether a feature is supported by the target CPU.
static bool IsSupported(CpuFeature f) {
ASSERT(initialized_);
// There are no optional features for ARM64.
return false;
};
static bool IsFoundByRuntimeProbingOnly(CpuFeature f) {
ASSERT(initialized_);
// There are no optional features for ARM64.
return false;
}
static bool IsSafeForSnapshot(CpuFeature f) {
return (IsSupported(f) &&
(!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f)));
}
// I and D cache line size in bytes.
static unsigned dcache_line_size();
static unsigned icache_line_size();
static unsigned supported_;
static bool VerifyCrossCompiling() {
// There are no optional features for ARM64.
ASSERT(cross_compile_ == 0);
return true;
}
static bool VerifyCrossCompiling(CpuFeature f) {
// There are no optional features for ARM64.
USE(f);
ASSERT(cross_compile_ == 0);
return true;
}
private:
// Return the content of the cache type register.
static uint32_t GetCacheType();
// I and D cache line size in bytes.
static unsigned icache_line_size_;
static unsigned dcache_line_size_;
#ifdef DEBUG
static bool initialized_;
#endif
// This isn't used (and is always 0), but it is required by V8.
static unsigned found_by_runtime_probing_only_;
static unsigned cross_compile_;
friend class PlatformFeatureScope;
DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
};
} } // namespace v8::internal
#endif // V8_ARM64_CPU_ARM64_H_
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