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// Copyright (c) 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PAGE_ALLOCATOR_CONSTANTS_H_
#define THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PAGE_ALLOCATOR_CONSTANTS_H_
#include <stddef.h>
#include "build/build_config.h"
namespace pdfium {
namespace base {
#if defined(OS_WIN)
static constexpr size_t kPageAllocationGranularityShift = 16; // 64KB
#elif defined(_MIPS_ARCH_LOONGSON)
static constexpr size_t kPageAllocationGranularityShift = 14; // 16KB
#else
static constexpr size_t kPageAllocationGranularityShift = 12; // 4KB
#endif
static constexpr size_t kPageAllocationGranularity =
1 << kPageAllocationGranularityShift;
static constexpr size_t kPageAllocationGranularityOffsetMask =
kPageAllocationGranularity - 1;
static constexpr size_t kPageAllocationGranularityBaseMask =
~kPageAllocationGranularityOffsetMask;
#if defined(_MIPS_ARCH_LOONGSON)
static constexpr size_t kSystemPageSize = 16384;
#else
static constexpr size_t kSystemPageSize = 4096;
#endif
static constexpr size_t kSystemPageOffsetMask = kSystemPageSize - 1;
static_assert((kSystemPageSize & (kSystemPageSize - 1)) == 0,
"kSystemPageSize must be power of 2");
static constexpr size_t kSystemPageBaseMask = ~kSystemPageOffsetMask;
static constexpr size_t kPageMetadataShift = 5; // 32 bytes per partition page.
static constexpr size_t kPageMetadataSize = 1 << kPageMetadataShift;
} // namespace base
} // namespace pdfium
#endif // THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PAGE_ALLOCATOR_CONSTANTS_H_
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