100 lines
4.0 KiB
C++
100 lines
4.0 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 "KMemory.h"
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namespace skyline::kernel::type {
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/**
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* @brief KSharedMemory is used to hold a particular amount of shared memory
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*/
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class KSharedMemory : public KMemory {
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private:
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int fd; //!< A file descriptor to the underlying shared memory
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memory::MemoryState initialState; //!< This is to hold the initial state for the Map call
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public:
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/**
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* @brief This holds the address and size of a process's mapping
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*/
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struct MapInfo {
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u64 address;
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size_t size;
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memory::Permission permission;
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/**
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* @brief Returns if the object is valid
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* @return If the MapInfo object is valid
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*/
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inline bool Valid() { return address && size && permission.Get(); }
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} kernel, guest;
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/**
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* @param state The state of the device
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* @param address The address of the allocation on the kernel (If NULL then an arbitrary address is picked)
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* @param size The size of the allocation on the kernel
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* @param permission The permission of the kernel process
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* @param memState The MemoryState of the chunk of memory
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* @param mmapFlags Additional flags to pass to mmap
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*/
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KSharedMemory(const DeviceState &state, u64 address, size_t size, const memory::Permission permission, memory::MemoryState memState = memory::states::SharedMemory, int mmapFlags = 0);
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/**
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* @brief Maps the shared memory in the guest
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* @param address The address to map to (If NULL an arbitrary address is picked)
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* @param size The amount of shared memory to map
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* @param permission The permission of the kernel process
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* @return The address of the allocation
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*/
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u64 Map(const u64 address, const u64 size, memory::Permission permission);
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/**
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* @brief Resize a chunk of memory as to change the size occupied by it
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* @param size The new size of the memory
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*/
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virtual void Resize(size_t size);
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/**
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* @brief Updates the permissions of a block of mapped memory
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* @param address The starting address to change the permissions at
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* @param size The size of the partition to change the permissions of
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* @param permission The new permissions to be set for the memory
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* @param host Set the permissions for the kernel rather than the guest
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*/
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void UpdatePermission(u64 address, u64 size, memory::Permission permission, bool host = false);
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/**
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* @brief Updates the permissions of a block of mapped memory
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* @param address The starting address to change the permissions at
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* @param size The size of the partition to change the permissions of
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* @param permission The new permissions to be set for the memory
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*/
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virtual void UpdatePermission(u64 address, u64 size, memory::Permission permission) {
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UpdatePermission(address, size, permission, false);
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}
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/**
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* @brief Updates the permissions of a chunk of mapped memory
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* @param permission The new permissions to be set for the memory
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*/
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inline virtual void UpdatePermission(memory::Permission permission) {
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UpdatePermission(guest.address, guest.size, permission, false);
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}
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/**
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* @brief Checks if the specified address is within the guest memory object
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* @param address The address to check
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* @return If the address is inside the guest memory object
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*/
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inline virtual bool IsInside(u64 address) {
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return (guest.address <= address) && ((guest.address + guest.size) > address);
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}
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/**
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* @brief The destructor of shared memory, it deallocates the memory from all processes
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*/
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~KSharedMemory();
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};
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}
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