rpcs3/Utilities/VirtualMemory.h

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#pragma once
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namespace utils
{
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// Memory protection type
enum class protection
{
rw, // Read + write (default)
ro, // Read only
no, // No access
wx, // Read + write + execute
rx, // Read + execute
};
/**
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* Reserve `size` bytes of virtual memory and returns it.
* The memory should be commited before usage.
*/
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void* memory_reserve(std::size_t size, void* use_addr = nullptr);
/**
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* Commit `size` bytes of virtual memory starting at pointer.
* That is, bake reserved memory with physical memory.
* pointer should belong to a range of reserved memory.
*/
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void memory_commit(void* pointer, std::size_t size, protection prot = protection::rw);
/**
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* Decommit all memory committed via commit_page_memory.
*/
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void memory_decommit(void* pointer, std::size_t size);
// Free memory after reserved by memory_reserve, should specify original size
void memory_release(void* pointer, std::size_t size);
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// Set memory protection
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void memory_protect(void* pointer, std::size_t size, protection prot);
// Shared memory handle
class shm
{
#ifdef _WIN32
void* m_handle;
#else
int m_file;
#endif
u32 m_size;
u8* m_ptr;
public:
explicit shm(u32 size);
shm(const shm&) = delete;
~shm();
// Map shared memory
u8* map(void* ptr, protection prot = protection::rw) const;
// Map shared memory over reserved memory region, which is unsafe (non-atomic) under Win32
u8* map_critical(void* ptr, protection prot = protection::rw);
// Unmap shared memory
void unmap(void* ptr) const;
// Unmap shared memory, undoing map_critical
void unmap_critical(void* ptr);
// Access memory with simple range check
u8* get(u32 offset, u32 size) const
{
if (offset >= m_size || m_size - offset < size)
{
return nullptr;
}
return m_ptr + offset;
}
u32 size() const
{
return m_size;
}
};
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}