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// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
// This file references various implementation details from Atmosphere, an open-source firmware for
// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
#include <array>
#include "common/assert.h"
#include "core/hle/kernel/memory/address_space_info.h"
namespace Kernel::Memory {
namespace {
enum : u64 {
Size_1_MB = 0x100000,
Size_2_MB = 2 * Size_1_MB,
Size_128_MB = 128 * Size_1_MB,
Size_1_GB = 0x40000000,
Size_2_GB = 2 * Size_1_GB,
Size_4_GB = 4 * Size_1_GB,
Size_6_GB = 6 * Size_1_GB,
Size_64_GB = 64 * Size_1_GB,
Size_512_GB = 512 * Size_1_GB,
Invalid = std::numeric_limits<u64>::max(),
};
// clang-format off
constexpr std::array<AddressSpaceInfo, 13> AddressSpaceInfos{{
{ 32 /*bit_width*/, Size_2_MB /*addr*/, Size_1_GB - Size_2_MB /*size*/, AddressSpaceInfo::Type::Is32Bit, },
{ 32 /*bit_width*/, Size_1_GB /*addr*/, Size_4_GB - Size_1_GB /*size*/, AddressSpaceInfo::Type::Small64Bit, },
{ 32 /*bit_width*/, Invalid /*addr*/, Size_1_GB /*size*/, AddressSpaceInfo::Type::Heap, },
{ 32 /*bit_width*/, Invalid /*addr*/, Size_1_GB /*size*/, AddressSpaceInfo::Type::Alias, },
{ 36 /*bit_width*/, Size_128_MB /*addr*/, Size_2_GB - Size_128_MB /*size*/, AddressSpaceInfo::Type::Is32Bit, },
{ 36 /*bit_width*/, Size_2_GB /*addr*/, Size_64_GB - Size_2_GB /*size*/, AddressSpaceInfo::Type::Small64Bit, },
{ 36 /*bit_width*/, Invalid /*addr*/, Size_6_GB /*size*/, AddressSpaceInfo::Type::Heap, },
{ 36 /*bit_width*/, Invalid /*addr*/, Size_6_GB /*size*/, AddressSpaceInfo::Type::Alias, },
{ 39 /*bit_width*/, Size_128_MB /*addr*/, Size_512_GB - Size_128_MB /*size*/, AddressSpaceInfo::Type::Large64Bit, },
{ 39 /*bit_width*/, Invalid /*addr*/, Size_64_GB /*size*/, AddressSpaceInfo::Type::Is32Bit },
{ 39 /*bit_width*/, Invalid /*addr*/, Size_6_GB /*size*/, AddressSpaceInfo::Type::Heap, },
{ 39 /*bit_width*/, Invalid /*addr*/, Size_64_GB /*size*/, AddressSpaceInfo::Type::Alias, },
{ 39 /*bit_width*/, Invalid /*addr*/, Size_2_GB /*size*/, AddressSpaceInfo::Type::Stack, },
}};
// clang-format on
constexpr bool IsAllowedIndexForAddress(std::size_t index) {
return index < std::size(AddressSpaceInfos) && AddressSpaceInfos[index].GetAddress() != Invalid;
}
constexpr std::array<std::size_t, static_cast<std::size_t>(AddressSpaceInfo::Type::Count)>
AddressSpaceIndices32Bit{
0, 1, 0, 2, 0, 3,
};
constexpr std::array<std::size_t, static_cast<std::size_t>(AddressSpaceInfo::Type::Count)>
AddressSpaceIndices36Bit{
4, 5, 4, 6, 4, 7,
};
constexpr std::array<std::size_t, static_cast<std::size_t>(AddressSpaceInfo::Type::Count)>
AddressSpaceIndices39Bit{
9, 8, 8, 10, 12, 11,
};
constexpr bool IsAllowed32BitType(AddressSpaceInfo::Type type) {
return type < AddressSpaceInfo::Type::Count && type != AddressSpaceInfo::Type::Large64Bit &&
type != AddressSpaceInfo::Type::Stack;
}
constexpr bool IsAllowed36BitType(AddressSpaceInfo::Type type) {
return type < AddressSpaceInfo::Type::Count && type != AddressSpaceInfo::Type::Large64Bit &&
type != AddressSpaceInfo::Type::Stack;
}
constexpr bool IsAllowed39BitType(AddressSpaceInfo::Type type) {
return type < AddressSpaceInfo::Type::Count && type != AddressSpaceInfo::Type::Small64Bit;
}
} // namespace
u64 AddressSpaceInfo::GetAddressSpaceStart(std::size_t width, AddressSpaceInfo::Type type) {
const std::size_t index{static_cast<std::size_t>(type)};
switch (width) {
case 32:
ASSERT(IsAllowed32BitType(type));
ASSERT(IsAllowedIndexForAddress(AddressSpaceIndices32Bit[index]));
return AddressSpaceInfos[AddressSpaceIndices32Bit[index]].GetAddress();
case 36:
ASSERT(IsAllowed36BitType(type));
ASSERT(IsAllowedIndexForAddress(AddressSpaceIndices36Bit[index]));
return AddressSpaceInfos[AddressSpaceIndices36Bit[index]].GetAddress();
case 39:
ASSERT(IsAllowed39BitType(type));
ASSERT(IsAllowedIndexForAddress(AddressSpaceIndices39Bit[index]));
return AddressSpaceInfos[AddressSpaceIndices39Bit[index]].GetAddress();
}
UNREACHABLE();
}
std::size_t AddressSpaceInfo::GetAddressSpaceSize(std::size_t width, AddressSpaceInfo::Type type) {
const std::size_t index{static_cast<std::size_t>(type)};
switch (width) {
case 32:
ASSERT(IsAllowed32BitType(type));
return AddressSpaceInfos[AddressSpaceIndices32Bit[index]].GetSize();
case 36:
ASSERT(IsAllowed36BitType(type));
return AddressSpaceInfos[AddressSpaceIndices36Bit[index]].GetSize();
case 39:
ASSERT(IsAllowed39BitType(type));
return AddressSpaceInfos[AddressSpaceIndices39Bit[index]].GetSize();
}
UNREACHABLE();
}
} // namespace Kernel::Memory
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