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https://github.com/skyline-emu/skyline.git
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fe5061a8e0
This addresses all CR comments including more codebase-wide changes arising from certain review comments like proper usage of its/it's and consistent contraction of it is into it's. An overhaul was made to the presentation and formatting of `KThread.h` and `LoadBalance` works has been superseded by `GetOptimalCoreForThread` which can be used alongside `InsertThread` or `MigrateToCore`. It makes the API far more atomic and neater. This was a major point of contention for the design prior, it's simplified some code and potentially improved performance.
258 lines
11 KiB
C++
258 lines
11 KiB
C++
// SPDX-License-Identifier: MPL-2.0
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// Copyright © 2020 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include <common.h>
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namespace skyline {
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namespace memory {
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union Permission {
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/**
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* @brief Initializes all permissions to false
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*/
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constexpr Permission() : r(), w(), x() {}
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/**
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* @brief Initializes permissions where the first three bits correspond to RWX
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*/
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constexpr explicit Permission(u8 raw) : raw(raw) {}
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/**
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* @param read If memory has read permission
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* @param write If memory has write permission
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* @param execute If memory has execute permission
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*/
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constexpr Permission(bool read, bool write, bool execute) : r(read), w(write), x(execute) {}
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inline bool operator==(const Permission &rhs) const { return (this->r == rhs.r && this->w == rhs.w && this->x == rhs.x); }
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inline bool operator!=(const Permission &rhs) const { return !operator==(rhs); }
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/**
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* @return The value of the permission struct in Linux format
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*/
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constexpr int Get() const {
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int perm{};
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if (r)
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perm |= PROT_READ;
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if (w)
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perm |= PROT_WRITE;
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if (x)
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perm |= PROT_EXEC;
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return perm;
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}
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struct {
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bool r : 1; //!< The permission to read
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bool w : 1; //!< The permission to write
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bool x : 1; //!< The permission to execute
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};
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u8 raw;
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};
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static_assert(sizeof(Permission) == sizeof(u8));
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/**
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* @url https://switchbrew.org/wiki/SVC#MemoryAttribute
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*/
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union MemoryAttribute {
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struct {
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bool isBorrowed : 1; //!< This is required for async IPC user buffers
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bool isIpcLocked : 1; //!< True when IpcRefCount > 0
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bool isDeviceShared : 1; //!< True when DeviceRefCount > 0
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bool isUncached : 1; //!< This is used to disable memory caching to share memory with the GPU
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};
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u32 value{};
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};
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/**
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* @url https://switchbrew.org/wiki/SVC#MemoryInfo
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*/
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struct MemoryInfo {
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u64 address; //!< The base address of the mapping
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u64 size; //!< The size of the mapping
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u32 type; //!< The MemoryType of the mapping
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u32 attributes; //!< The attributes of the mapping
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u32 permissions; //!< The permissions of the mapping
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u32 ipcRefCount; //!< The IPC reference count (Always 0)
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u32 deviceRefCount; //!< The device reference count (Always 0)
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u32 _pad0_;
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};
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static_assert(sizeof(MemoryInfo) == 0x28);
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/**
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* @brief These are specific markers for the type of a memory region
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* @url https://switchbrew.org/wiki/SVC#MemoryType
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*/
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enum class MemoryType : u8 {
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Unmapped = 0x0,
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Io = 0x1,
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Normal = 0x2,
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CodeStatic = 0x3,
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CodeMutable = 0x4,
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Heap = 0x5,
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SharedMemory = 0x6,
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Alias = 0x7,
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ModuleCodeStatic = 0x8,
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ModuleCodeMutable = 0x9,
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Ipc = 0xA,
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Stack = 0xB,
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ThreadLocal = 0xC,
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TransferMemoryIsolated = 0xD,
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TransferMemory = 0xE,
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ProcessMemory = 0xF,
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Reserved = 0x10,
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NonSecureIpc = 0x11,
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NonDeviceIpc = 0x12,
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KernelStack = 0x13,
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CodeReadOnly = 0x14,
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CodeWritable = 0x15,
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};
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/**
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* @url https://switchbrew.org/wiki/SVC#MemoryState
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*/
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union MemoryState {
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constexpr MemoryState(const u32 value) : value(value) {}
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constexpr MemoryState() : value(0) {}
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constexpr bool operator==(const MemoryState &other) const {
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return value == other.value;
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}
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constexpr bool operator!=(const MemoryState &other) const {
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return value != other.value;
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}
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struct {
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MemoryType type;
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bool permissionChangeAllowed : 1; //!< If the application can use svcSetMemoryPermission on this block
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bool forceReadWritableByDebugSyscalls : 1; //!< If the application can use svcWriteDebugProcessMemory on this block
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bool ipcSendAllowed : 1; //!< If this block is allowed to be sent as an IPC buffer with flags=0
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bool nonDeviceIpcSendAllowed : 1; //!< If this block is allowed to be sent as an IPC buffer with flags=3
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bool nonSecureIpcSendAllowed : 1; //!< If this block is allowed to be sent as an IPC buffer with flags=1
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bool _pad0_ : 1;
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bool processPermissionChangeAllowed : 1; //!< If the application can use svcSetProcessMemoryPermission on this block
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bool mapAllowed : 1; //!< If the application can use svcMapMemory on this block
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bool unmapProcessCodeMemoryAllowed : 1; //!< If the application can use svcUnmapProcessCodeMemory on this block
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bool transferMemoryAllowed : 1; //!< If the application can use svcCreateTransferMemory on this block
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bool queryPhysicalAddressAllowed : 1; //!< If the application can use svcQueryPhysicalAddress on this block
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bool mapDeviceAllowed : 1; //!< If the application can use svcMapDeviceAddressSpace or svcMapDeviceAddressSpaceByForce on this block
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bool mapDeviceAlignedAllowed : 1; //!< If the application can use svcMapDeviceAddressSpaceAligned on this block
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bool ipcBufferAllowed : 1; //!< If the application can use this block with svcSendSyncRequestWithUserBuffer
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bool isReferenceCounted : 1; //!< If the physical memory blocks backing this region are reference counted
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bool mapProcessAllowed : 1; //!< If the application can use svcMapProcessMemory on this block
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bool attributeChangeAllowed : 1; //!< If the application can use svcSetMemoryAttribute on this block
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bool codeMemoryAllowed : 1; //!< If the application can use svcCreateCodeMemory on this block
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};
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u32 value{};
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};
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static_assert(sizeof(MemoryState) == sizeof(u32));
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/**
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* @brief The preset states that different regions are set to
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* @url https://switchbrew.org/wiki/SVC#MemoryType
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*/
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namespace states {
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constexpr MemoryState Unmapped{0x00000000};
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constexpr MemoryState Io{0x00002001};
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constexpr MemoryState CodeStatic{0x00DC7E03};
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constexpr MemoryState CodeMutable{0x03FEBD04};
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constexpr MemoryState Heap{0x037EBD05};
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constexpr MemoryState SharedMemory{0x00402006};
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constexpr MemoryState Alias{0x00482907};
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constexpr MemoryState AliasCode{0x00DD7E08};
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constexpr MemoryState AliasCodeData{0x03FFBD09};
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constexpr MemoryState Ipc{0x005C3C0A};
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constexpr MemoryState Stack{0x005C3C0B};
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constexpr MemoryState ThreadLocal{0x0040200C};
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constexpr MemoryState TransferMemoryIsolated{0x015C3C0D};
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constexpr MemoryState TransferMemory{0x005C380E};
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constexpr MemoryState SharedCode{0x0040380F};
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constexpr MemoryState Reserved{0x00000010};
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constexpr MemoryState NonSecureIpc{0x005C3811};
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constexpr MemoryState NonDeviceIpc{0x004C2812};
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constexpr MemoryState KernelStack{0x00002013};
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constexpr MemoryState CodeReadOnly{0x00402214};
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constexpr MemoryState CodeWritable{0x00402015};
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};
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struct Region {
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u64 address;
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size_t size;
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bool IsInside(void *ptr) {
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return (address <= reinterpret_cast<u64>(ptr)) && ((address + size) > reinterpret_cast<u64>(ptr));
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}
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};
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enum class AddressSpaceType : u8 {
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AddressSpace32Bit = 0, //!< 32-bit address space used by 32-bit applications
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AddressSpace36Bit = 1, //!< 36-bit address space used by 64-bit applications before 2.0.0
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AddressSpace32BitNoReserved = 2, //!< 32-bit address space without the map region
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AddressSpace39Bit = 3, //!< 39-bit address space used by 64-bit applications after 2.0.0
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};
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}
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namespace kernel {
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struct ChunkDescriptor {
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u8 *ptr;
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size_t size;
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memory::Permission permission;
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memory::MemoryState state;
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memory::MemoryAttribute attributes;
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constexpr bool IsCompatible(const ChunkDescriptor &chunk) const {
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return chunk.permission == permission && chunk.state.value == state.value && chunk.attributes.value == attributes.value;
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}
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};
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/**
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* @brief MemoryManager keeps track of guest virtual memory and its related attributes
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*/
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class MemoryManager {
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private:
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const DeviceState &state;
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std::vector<ChunkDescriptor> chunks;
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public:
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memory::Region addressSpace{}; //!< The entire address space
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memory::Region base{}; //!< The application-accessible address space
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memory::Region code{};
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memory::Region alias{};
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memory::Region heap{};
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memory::Region stack{};
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memory::Region tlsIo{}; //!< TLS/IO
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std::shared_mutex mutex; //!< Synchronizes any operations done on the VMM, it's locked in shared mode by readers and exclusive mode by writers
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MemoryManager(const DeviceState &state);
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~MemoryManager();
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/**
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* @note This should be called before any mappings in the VMM or calls to InitalizeRegions are done
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*/
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void InitializeVmm(memory::AddressSpaceType type);
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void InitializeRegions(u8 *codeStart, u64 size);
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void InsertChunk(const ChunkDescriptor &chunk);
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std::optional<ChunkDescriptor> Get(void *ptr);
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/**
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* @return The cumulative size of all heap (Physical Memory + Process Heap) memory mappings, the code region and the main thread stack in bytes
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*/
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size_t GetUserMemoryUsage();
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/**
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* @return The total page-aligned size used to store memory block metadata, if they were KMemoryBlocks rather than ChunkDescriptor
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* @note There is a ceiling of SystemResourceSize as specified in the NPDM, this value will be clipped to that
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*/
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size_t GetSystemResourceUsage();
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};
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}
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}
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