// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <memory>
#include <tuple>
#include <vector>
#include "common/common_types.h"
#include "common/memory_hook.h"
#include "common/page_table.h"
#include "core/hle/result.h"
#include "core/memory.h"
namespace FileSys {
enum class ProgramAddressSpaceType : u8;
}
namespace Kernel {
enum class VMAType : u8 {
/// VMA represents an unmapped region of the address space.
Free,
/// VMA is backed by a ref-counted allocate memory block.
AllocatedMemoryBlock,
/// VMA is backed by a raw, unmanaged pointer.
BackingMemory,
/// VMA is mapped to MMIO registers at a fixed PAddr.
MMIO,
// TODO(yuriks): Implement MemoryAlias to support MAP/UNMAP
};
/// Permissions for mapped memory blocks
enum class VMAPermission : u8 {
None = 0,
Read = 1,
Write = 2,
Execute = 4,
ReadWrite = Read | Write,
ReadExecute = Read | Execute,
WriteExecute = Write | Execute,
ReadWriteExecute = Read | Write | Execute,
// Used as a wildcard when checking permissions across memory ranges
All = 0xFF,
};
constexpr VMAPermission operator|(VMAPermission lhs, VMAPermission rhs) {
return static_cast<VMAPermission>(u32(lhs) | u32(rhs));
}
constexpr VMAPermission operator&(VMAPermission lhs, VMAPermission rhs) {
return static_cast<VMAPermission>(u32(lhs) & u32(rhs));
}
constexpr VMAPermission operator^(VMAPermission lhs, VMAPermission rhs) {
return static_cast<VMAPermission>(u32(lhs) ^ u32(rhs));
}
constexpr VMAPermission operator~(VMAPermission permission) {
return static_cast<VMAPermission>(~u32(permission));
}
constexpr VMAPermission& operator|=(VMAPermission& lhs, VMAPermission rhs) {
lhs = lhs | rhs;
return lhs;
}
constexpr VMAPermission& operator&=(VMAPermission& lhs, VMAPermission rhs) {
lhs = lhs & rhs;
return lhs;
}
constexpr VMAPermission& operator^=(VMAPermission& lhs, VMAPermission rhs) {
lhs = lhs ^ rhs;
return lhs;
}
/// Attribute flags that can be applied to a VMA
enum class MemoryAttribute : u32 {
Mask = 0xFF,
/// No particular qualities
None = 0,
/// Memory locked/borrowed for use. e.g. This would be used by transfer memory.
Locked = 1,
/// Memory locked for use by IPC-related internals.
LockedForIPC = 2,
/// Mapped as part of the device address space.
DeviceMapped = 4,
/// Uncached memory
Uncached = 8,
};
constexpr MemoryAttribute operator|(MemoryAttribute lhs, MemoryAttribute rhs) {
return static_cast<MemoryAttribute>(u32(lhs) | u32(rhs));
}
constexpr MemoryAttribute operator&(MemoryAttribute lhs, MemoryAttribute rhs) {
return static_cast<MemoryAttribute>(u32(lhs) & u32(rhs));
}
constexpr MemoryAttribute operator^(MemoryAttribute lhs, MemoryAttribute rhs) {
return static_cast<MemoryAttribute>(u32(lhs) ^ u32(rhs));
}
constexpr MemoryAttribute operator~(MemoryAttribute attribute) {
return static_cast<MemoryAttribute>(~u32(attribute));
}
constexpr MemoryAttribute& operator|=(MemoryAttribute& lhs, MemoryAttribute rhs) {
lhs = lhs | rhs;
return lhs;
}
constexpr MemoryAttribute& operator&=(MemoryAttribute& lhs, MemoryAttribute rhs) {
lhs = lhs & rhs;
return lhs;
}
constexpr MemoryAttribute& operator^=(MemoryAttribute& lhs, MemoryAttribute rhs) {
lhs = lhs ^ rhs;
return lhs;
}
constexpr u32 ToSvcMemoryAttribute(MemoryAttribute attribute) {
return static_cast<u32>(attribute & MemoryAttribute::Mask);
}
// clang-format off
/// Represents memory states and any relevant flags, as used by the kernel.
/// svcQueryMemory interprets these by masking away all but the first eight
/// bits when storing memory state into a MemoryInfo instance.
enum class MemoryState : u32 {
Mask = 0xFF,
FlagProtect = 1U << 8,
FlagDebug = 1U << 9,
FlagIPC0 = 1U << 10,
FlagIPC3 = 1U << 11,
FlagIPC1 = 1U << 12,
FlagMapped = 1U << 13,
FlagCode = 1U << 14,
FlagAlias = 1U << 15,
FlagModule = 1U << 16,
FlagTransfer = 1U << 17,
FlagQueryPhysicalAddressAllowed = 1U << 18,
FlagSharedDevice = 1U << 19,
FlagSharedDeviceAligned = 1U << 20,
FlagIPCBuffer = 1U << 21,
FlagMemoryPoolAllocated = 1U << 22,
FlagMapProcess = 1U << 23,
FlagUncached = 1U << 24,
FlagCodeMemory = 1U << 25,
// Wildcard used in range checking to indicate all states.
All = 0xFFFFFFFF,
// Convenience flag sets to reduce repetition
IPCFlags = FlagIPC0 | FlagIPC3 | FlagIPC1,
CodeFlags = FlagDebug | IPCFlags | FlagMapped | FlagCode | FlagQueryPhysicalAddressAllowed |
FlagSharedDevice | FlagSharedDeviceAligned | FlagMemoryPoolAllocated,
DataFlags = FlagProtect | IPCFlags | FlagMapped | FlagAlias | FlagTransfer |
FlagQueryPhysicalAddressAllowed | FlagSharedDevice | FlagSharedDeviceAligned |
FlagMemoryPoolAllocated | FlagIPCBuffer | FlagUncached,
Unmapped = 0x00,
Io = 0x01 | FlagMapped,
Normal = 0x02 | FlagMapped | FlagQueryPhysicalAddressAllowed,
Code = 0x03 | CodeFlags | FlagMapProcess,
CodeData = 0x04 | DataFlags | FlagMapProcess | FlagCodeMemory,
Heap = 0x05 | DataFlags | FlagCodeMemory,
Shared = 0x06 | FlagMapped | FlagMemoryPoolAllocated,
ModuleCode = 0x08 | CodeFlags | FlagModule | FlagMapProcess,
ModuleCodeData = 0x09 | DataFlags | FlagModule | FlagMapProcess | FlagCodeMemory,
IpcBuffer0 = 0x0A | FlagMapped | FlagQueryPhysicalAddressAllowed | FlagMemoryPoolAllocated |
IPCFlags | FlagSharedDevice | FlagSharedDeviceAligned,
Stack = 0x0B | FlagMapped | IPCFlags | FlagQueryPhysicalAddressAllowed |
FlagSharedDevice | FlagSharedDeviceAligned | FlagMemoryPoolAllocated,
ThreadLocal = 0x0C | FlagMapped | FlagMemoryPoolAllocated,
TransferMemoryIsolated = 0x0D | IPCFlags | FlagMapped | FlagQueryPhysicalAddressAllowed |
FlagSharedDevice | FlagSharedDeviceAligned | FlagMemoryPoolAllocated |
FlagUncached,
TransferMemory = 0x0E | FlagIPC3 | FlagIPC1 | FlagMapped | FlagQueryPhysicalAddressAllowed |
FlagSharedDevice | FlagSharedDeviceAligned | FlagMemoryPoolAllocated,
ProcessMemory = 0x0F | FlagIPC3 | FlagIPC1 | FlagMapped | FlagMemoryPoolAllocated,
// Used to signify an inaccessible or invalid memory region with memory queries
Inaccessible = 0x10,
IpcBuffer1 = 0x11 | FlagIPC3 | FlagIPC1 | FlagMapped | FlagQueryPhysicalAddressAllowed |
FlagSharedDevice | FlagSharedDeviceAligned | FlagMemoryPoolAllocated,
IpcBuffer3 = 0x12 | FlagIPC3 | FlagMapped | FlagQueryPhysicalAddressAllowed |
FlagSharedDeviceAligned | FlagMemoryPoolAllocated,
KernelStack = 0x13 | FlagMapped,
};
// clang-format on
constexpr MemoryState operator|(MemoryState lhs, MemoryState rhs) {
return static_cast<MemoryState>(u32(lhs) | u32(rhs));
}
constexpr MemoryState operator&(MemoryState lhs, MemoryState rhs) {
return static_cast<MemoryState>(u32(lhs) & u32(rhs));
}
constexpr MemoryState operator^(MemoryState lhs, MemoryState rhs) {
return static_cast<MemoryState>(u32(lhs) ^ u32(rhs));
}
constexpr MemoryState operator~(MemoryState lhs) {
return static_cast<MemoryState>(~u32(lhs));
}
constexpr MemoryState& operator|=(MemoryState& lhs, MemoryState rhs) {
lhs = lhs | rhs;
return lhs;
}
constexpr MemoryState& operator&=(MemoryState& lhs, MemoryState rhs) {
lhs = lhs & rhs;
return lhs;
}
constexpr MemoryState& operator^=(MemoryState& lhs, MemoryState rhs) {
lhs = lhs ^ rhs;
return lhs;
}
constexpr u32 ToSvcMemoryState(MemoryState state) {
return static_cast<u32>(state & MemoryState::Mask);
}
struct MemoryInfo {
u64 base_address;
u64 size;
u32 state;
u32 attributes;
u32 permission;
u32 ipc_ref_count;
u32 device_ref_count;
};
static_assert(sizeof(MemoryInfo) == 0x28, "MemoryInfo has incorrect size.");
struct PageInfo {
u32 flags;
};
/**
* Represents a VMA in an address space. A VMA is a contiguous region of virtual addressing space
* with homogeneous attributes across its extents. In this particular implementation each VMA is
* also backed by a single host memory allocation.
*/
struct VirtualMemoryArea {
/// Gets the starting (base) address of this VMA.
VAddr StartAddress() const {
return base;
}
/// Gets the ending address of this VMA.
VAddr EndAddress() const {
return base + size - 1;
}
/// Virtual base address of the region.
VAddr base = 0;
/// Size of the region.
u64 size = 0;
VMAType type = VMAType::Free;
VMAPermission permissions = VMAPermission::None;
MemoryState state = MemoryState::Unmapped;
MemoryAttribute attribute = MemoryAttribute::None;
// Settings for type = AllocatedMemoryBlock
/// Memory block backing this VMA.
std::shared_ptr<std::vector<u8>> backing_block = nullptr;
/// Offset into the backing_memory the mapping starts from.
std::size_t offset = 0;
// Settings for type = BackingMemory
/// Pointer backing this VMA. It will not be destroyed or freed when the VMA is removed.
u8* backing_memory = nullptr;
// Settings for type = MMIO
/// Physical address of the register area this VMA maps to.
PAddr paddr = 0;
Common::MemoryHookPointer mmio_handler = nullptr;
/// Tests if this area can be merged to the right with `next`.
bool CanBeMergedWith(const VirtualMemoryArea& next) const;
};
/**
* Manages a process' virtual addressing space. This class maintains a list of allocated and free
* regions in the address space, along with their attributes, and allows kernel clients to
* manipulate it, adjusting the page table to match.
*
* This is similar in idea and purpose to the VM manager present in operating system kernels, with
* the main difference being that it doesn't have to support swapping or memory mapping of files.
* The implementation is also simplified by not having to allocate page frames. See these articles
* about the Linux kernel for an explantion of the concept and implementation:
* - http://duartes.org/gustavo/blog/post/how-the-kernel-manages-your-memory/
* - http://duartes.org/gustavo/blog/post/page-cache-the-affair-between-memory-and-files/
*/
class VMManager final {
using VMAMap = std::map<VAddr, VirtualMemoryArea>;
public:
using VMAHandle = VMAMap::const_iterator;
VMManager();
~VMManager();
/// Clears the address space map, re-initializing with a single free area.
void Reset(FileSys::ProgramAddressSpaceType type);
/// Finds the VMA in which the given address is included in, or `vma_map.end()`.
VMAHandle FindVMA(VAddr target) const;
/// Indicates whether or not the given handle is within the VMA map.
bool IsValidHandle(VMAHandle handle) const;
// TODO(yuriks): Should these functions actually return the handle?
/**
* Maps part of a ref-counted block of memory at a given address.
*
* @param target The guest address to start the mapping at.
* @param block The block to be mapped.
* @param offset Offset into `block` to map from.
* @param size Size of the mapping.
* @param state MemoryState tag to attach to the VMA.
*/
ResultVal<VMAHandle> MapMemoryBlock(VAddr target, std::shared_ptr<std::vector<u8>> block,
std::size_t offset, u64 size, MemoryState state);
/**
* Maps an unmanaged host memory pointer at a given address.
*
* @param target The guest address to start the mapping at.
* @param memory The memory to be mapped.
* @param size Size of the mapping.
* @param state MemoryState tag to attach to the VMA.
*/
ResultVal<VMAHandle> MapBackingMemory(VAddr target, u8* memory, u64 size, MemoryState state);
/**
* Finds the first free address that can hold a region of the desired size.
*
* @param size Size of the desired region.
* @return The found free address.
*/
ResultVal<VAddr> FindFreeRegion(u64 size) const;
/**
* Maps a memory-mapped IO region at a given address.
*
* @param target The guest address to start the mapping at.
* @param paddr The physical address where the registers are present.
* @param size Size of the mapping.
* @param state MemoryState tag to attach to the VMA.
* @param mmio_handler The handler that will implement read and write for this MMIO region.
*/
ResultVal<VMAHandle> MapMMIO(VAddr target, PAddr paddr, u64 size, MemoryState state,
Common::MemoryHookPointer mmio_handler);
/// Unmaps a range of addresses, splitting VMAs as necessary.
ResultCode UnmapRange(VAddr target, u64 size);
/// Changes the permissions of the given VMA.
VMAHandle Reprotect(VMAHandle vma, VMAPermission new_perms);
/// Changes the permissions of a range of addresses, splitting VMAs as necessary.
ResultCode ReprotectRange(VAddr target, u64 size, VMAPermission new_perms);
ResultCode MirrorMemory(VAddr dst_addr, VAddr src_addr, u64 size, MemoryState state);
/// Attempts to allocate a heap with the given size.
///
/// @param size The size of the heap to allocate in bytes.
///
/// @note If a heap is currently allocated, and this is called
/// with a size that is equal to the size of the current heap,
/// then this function will do nothing and return the current
/// heap's starting address, as there's no need to perform
/// any additional heap allocation work.
///
/// @note If a heap is currently allocated, and this is called
/// with a size less than the current heap's size, then
/// this function will attempt to shrink the heap.
///
/// @note If a heap is currently allocated, and this is called
/// with a size larger than the current heap's size, then
/// this function will attempt to extend the size of the heap.
///
/// @returns A result indicating either success or failure.
/// <p>
/// If successful, this function will return a result
/// containing the starting address to the allocated heap.
/// <p>
/// If unsuccessful, this function will return a result
/// containing an error code.
///
/// @pre The given size must lie within the allowable heap
/// memory region managed by this VMManager instance.
/// Failure to abide by this will result in ERR_OUT_OF_MEMORY
/// being returned as the result.
///
ResultVal<VAddr> SetHeapSize(u64 size);
/// Maps a region of memory as code memory.
///
/// @param dst_address The base address of the region to create the aliasing memory region.
/// @param src_address The base address of the region to be aliased.
/// @param size The total amount of memory to map in bytes.
///
/// @pre Both memory regions lie within the actual addressable address space.
///
/// @post After this function finishes execution, assuming success, then the address range
/// [dst_address, dst_address+size) will alias the memory region,
/// [src_address, src_address+size).
/// <p>
/// What this also entails is as follows:
/// 1. The aliased region gains the Locked memory attribute.
/// 2. The aliased region becomes read-only.
/// 3. The aliasing region becomes read-only.
/// 4. The aliasing region is created with a memory state of MemoryState::CodeModule.
///
ResultCode MapCodeMemory(VAddr dst_address, VAddr src_address, u64 size);
/// Unmaps a region of memory designated as code module memory.
///
/// @param dst_address The base address of the memory region aliasing the source memory region.
/// @param src_address The base address of the memory region being aliased.
/// @param size The size of the memory region to unmap in bytes.
///
/// @pre Both memory ranges lie within the actual addressable address space.
///
/// @pre The memory region being unmapped has been previously been mapped
/// by a call to MapCodeMemory.
///
/// @post After execution of the function, if successful. the aliasing memory region
/// will be unmapped and the aliased region will have various traits about it
/// restored to what they were prior to the original mapping call preceding
/// this function call.
/// <p>
/// What this also entails is as follows:
/// 1. The state of the memory region will now indicate a general heap region.
/// 2. All memory attributes for the memory region are cleared.
/// 3. Memory permissions for the region are restored to user read/write.
///
ResultCode UnmapCodeMemory(VAddr dst_address, VAddr src_address, u64 size);
/// Queries the memory manager for information about the given address.
///
/// @param address The address to query the memory manager about for information.
///
/// @return A MemoryInfo instance containing information about the given address.
///
MemoryInfo QueryMemory(VAddr address) const;
/// Sets an attribute across the given address range.
///
/// @param address The starting address
/// @param size The size of the range to set the attribute on.
/// @param mask The attribute mask
/// @param attribute The attribute to set across the given address range
///
/// @returns RESULT_SUCCESS if successful
/// @returns ERR_INVALID_ADDRESS_STATE if the attribute could not be set.
///
ResultCode SetMemoryAttribute(VAddr address, u64 size, MemoryAttribute mask,
MemoryAttribute attribute);
/**
* Scans all VMAs and updates the page table range of any that use the given vector as backing
* memory. This should be called after any operation that causes reallocation of the vector.
*/
void RefreshMemoryBlockMappings(const std::vector<u8>* block);
/// Dumps the address space layout to the log, for debugging
void LogLayout() const;
/// Gets the total memory usage, used by svcGetInfo
u64 GetTotalMemoryUsage() const;
/// Gets the address space base address
VAddr GetAddressSpaceBaseAddress() const;
/// Gets the address space end address
VAddr GetAddressSpaceEndAddress() const;
/// Gets the total address space address size in bytes
u64 GetAddressSpaceSize() const;
/// Gets the address space width in bits.
u64 GetAddressSpaceWidth() const;
/// Determines whether or not the given address range lies within the address space.
bool IsWithinAddressSpace(VAddr address, u64 size) const;
/// Gets the base address of the ASLR region.
VAddr GetASLRRegionBaseAddress() const;
/// Gets the end address of the ASLR region.
VAddr GetASLRRegionEndAddress() const;
/// Gets the size of the ASLR region
u64 GetASLRRegionSize() const;
/// Determines whether or not the specified address range is within the ASLR region.
bool IsWithinASLRRegion(VAddr address, u64 size) const;
/// Gets the base address of the code region.
VAddr GetCodeRegionBaseAddress() const;
/// Gets the end address of the code region.
VAddr GetCodeRegionEndAddress() const;
/// Gets the total size of the code region in bytes.
u64 GetCodeRegionSize() const;
/// Determines whether or not the specified range is within the code region.
bool IsWithinCodeRegion(VAddr address, u64 size) const;
/// Gets the base address of the heap region.
VAddr GetHeapRegionBaseAddress() const;
/// Gets the end address of the heap region;
VAddr GetHeapRegionEndAddress() const;
/// Gets the total size of the heap region in bytes.
u64 GetHeapRegionSize() const;
/// Gets the total size of the current heap in bytes.
///
/// @note This is the current allocated heap size, not the size
/// of the region it's allowed to exist within.
///
u64 GetCurrentHeapSize() const;
/// Determines whether or not the specified range is within the heap region.
bool IsWithinHeapRegion(VAddr address, u64 size) const;
/// Gets the base address of the map region.
VAddr GetMapRegionBaseAddress() const;
/// Gets the end address of the map region.
VAddr GetMapRegionEndAddress() const;
/// Gets the total size of the map region in bytes.
u64 GetMapRegionSize() const;
/// Determines whether or not the specified range is within the map region.
bool IsWithinMapRegion(VAddr address, u64 size) const;
/// Gets the base address of the new map region.
VAddr GetNewMapRegionBaseAddress() const;
/// Gets the end address of the new map region.
VAddr GetNewMapRegionEndAddress() const;
/// Gets the total size of the new map region in bytes.
u64 GetNewMapRegionSize() const;
/// Determines whether or not the given address range is within the new map region
bool IsWithinNewMapRegion(VAddr address, u64 size) const;
/// Gets the base address of the TLS IO region.
VAddr GetTLSIORegionBaseAddress() const;
/// Gets the end address of the TLS IO region.
VAddr GetTLSIORegionEndAddress() const;
/// Gets the total size of the TLS IO region in bytes.
u64 GetTLSIORegionSize() const;
/// Determines if the given address range is within the TLS IO region.
bool IsWithinTLSIORegion(VAddr address, u64 size) const;
/// Each VMManager has its own page table, which is set as the main one when the owning process
/// is scheduled.
Common::PageTable page_table{Memory::PAGE_BITS};
private:
using VMAIter = VMAMap::iterator;
/// Converts a VMAHandle to a mutable VMAIter.
VMAIter StripIterConstness(const VMAHandle& iter);
/// Unmaps the given VMA.
VMAIter Unmap(VMAIter vma);
/**
* Carves a VMA of a specific size at the specified address by splitting Free VMAs while doing
* the appropriate error checking.
*/
ResultVal<VMAIter> CarveVMA(VAddr base, u64 size);
/**
* Splits the edges of the given range of non-Free VMAs so that there is a VMA split at each
* end of the range.
*/
ResultVal<VMAIter> CarveVMARange(VAddr base, u64 size);
/**
* Splits a VMA in two, at the specified offset.
* @returns the right side of the split, with the original iterator becoming the left side.
*/
VMAIter SplitVMA(VMAIter vma, u64 offset_in_vma);
/**
* Checks for and merges the specified VMA with adjacent ones if possible.
* @returns the merged VMA or the original if no merging was possible.
*/
VMAIter MergeAdjacent(VMAIter vma);
/// Updates the pages corresponding to this VMA so they match the VMA's attributes.
void UpdatePageTableForVMA(const VirtualMemoryArea& vma);
/// Initializes memory region ranges to adhere to a given address space type.
void InitializeMemoryRegionRanges(FileSys::ProgramAddressSpaceType type);
/// Clears the underlying map and page table.
void Clear();
/// Clears out the VMA map, unmapping any previously mapped ranges.
void ClearVMAMap();
/// Clears out the page table
void ClearPageTable();
using CheckResults = ResultVal<std::tuple<MemoryState, VMAPermission, MemoryAttribute>>;
/// Checks if an address range adheres to the specified states provided.
///
/// @param address The starting address of the address range.
/// @param size The size of the address range.
/// @param state_mask The memory state mask.
/// @param state The state to compare the individual VMA states against,
/// which is done in the form of: (vma.state & state_mask) != state.
/// @param permission_mask The memory permissions mask.
/// @param permissions The permission to compare the individual VMA permissions against,
/// which is done in the form of:
/// (vma.permission & permission_mask) != permission.
/// @param attribute_mask The memory attribute mask.
/// @param attribute The memory attributes to compare the individual VMA attributes
/// against, which is done in the form of:
/// (vma.attributes & attribute_mask) != attribute.
/// @param ignore_mask The memory attributes to ignore during the check.
///
/// @returns If successful, returns a tuple containing the memory attributes
/// (with ignored bits specified by ignore_mask unset), memory permissions, and
/// memory state across the memory range.
/// @returns If not successful, returns ERR_INVALID_ADDRESS_STATE.
///
CheckResults CheckRangeState(VAddr address, u64 size, MemoryState state_mask, MemoryState state,
VMAPermission permission_mask, VMAPermission permissions,
MemoryAttribute attribute_mask, MemoryAttribute attribute,
MemoryAttribute ignore_mask) const;
/**
* A map covering the entirety of the managed address space, keyed by the `base` field of each
* VMA. It must always be modified by splitting or merging VMAs, so that the invariant
* `elem.base + elem.size == next.base` is preserved, and mergeable regions must always be
* merged when possible so that no two similar and adjacent regions exist that have not been
* merged.
*/
VMAMap vma_map;
u32 address_space_width = 0;
VAddr address_space_base = 0;
VAddr address_space_end = 0;
VAddr aslr_region_base = 0;
VAddr aslr_region_end = 0;
VAddr code_region_base = 0;
VAddr code_region_end = 0;
VAddr heap_region_base = 0;
VAddr heap_region_end = 0;
VAddr map_region_base = 0;
VAddr map_region_end = 0;
VAddr new_map_region_base = 0;
VAddr new_map_region_end = 0;
VAddr tls_io_region_base = 0;
VAddr tls_io_region_end = 0;
// Memory used to back the allocations in the regular heap. A single vector is used to cover
// the entire virtual address space extents that bound the allocations, including any holes.
// This makes deallocation and reallocation of holes fast and keeps process memory contiguous
// in the emulator address space, allowing Memory::GetPointer to be reasonably safe.
std::shared_ptr<std::vector<u8>> heap_memory;
// The end of the currently allocated heap. This is not an inclusive
// end of the range. This is essentially 'base_address + current_size'.
VAddr heap_end = 0;
};
} // namespace Kernel
