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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <optional>
#include "common/common_types.h"
#include "common/page_table.h"
namespace Tegra {
/**
* 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 {
enum class Type : u8 {
Unmapped,
Allocated,
Mapped,
};
/// Virtual base address of the region.
GPUVAddr base{};
/// Size of the region.
u64 size{};
/// Memory area mapping type.
Type type{Type::Unmapped};
/// CPU memory mapped address corresponding to this memory area.
VAddr backing_addr{};
/// Offset into the backing_memory the mapping starts from.
std::size_t offset{};
/// Pointer backing this VMA.
u8* backing_memory{};
/// Tests if this area can be merged to the right with `next`.
bool CanBeMergedWith(const VirtualMemoryArea& next) const;
};
class MemoryManager final {
public:
MemoryManager();
GPUVAddr AllocateSpace(u64 size, u64 align);
GPUVAddr AllocateSpace(GPUVAddr addr, u64 size, u64 align);
GPUVAddr MapBufferEx(VAddr cpu_addr, u64 size);
GPUVAddr MapBufferEx(VAddr cpu_addr, GPUVAddr addr, u64 size);
GPUVAddr UnmapBuffer(GPUVAddr addr, u64 size);
std::optional<VAddr> GpuToCpuAddress(GPUVAddr addr) const;
template <typename T>
T Read(GPUVAddr addr) const;
template <typename T>
void Write(GPUVAddr addr, T data);
u8* GetPointer(GPUVAddr addr);
const u8* GetPointer(GPUVAddr addr) const;
void ReadBlock(GPUVAddr src_addr, void* dest_buffer, std::size_t size) const;
void WriteBlock(GPUVAddr dest_addr, const void* src_buffer, std::size_t size);
void CopyBlock(GPUVAddr dest_addr, GPUVAddr src_addr, std::size_t size);
private:
using VMAMap = std::map<GPUVAddr, VirtualMemoryArea>;
using VMAHandle = VMAMap::const_iterator;
using VMAIter = VMAMap::iterator;
bool IsAddressValid(GPUVAddr addr) const;
void MapPages(GPUVAddr base, u64 size, u8* memory, Common::PageType type,
VAddr backing_addr = 0);
void MapMemoryRegion(GPUVAddr base, u64 size, u8* target, VAddr backing_addr);
void UnmapRegion(GPUVAddr base, u64 size);
/// Finds the VMA in which the given address is included in, or `vma_map.end()`.
VMAHandle FindVMA(GPUVAddr target) const;
VMAHandle AllocateMemory(GPUVAddr target, std::size_t offset, u64 size);
/**
* 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.
*/
VMAHandle MapBackingMemory(GPUVAddr target, u8* memory, u64 size, VAddr backing_addr);
/// Unmaps a range of addresses, splitting VMAs as necessary.
void UnmapRange(GPUVAddr target, u64 size);
/// Converts a VMAHandle to a mutable VMAIter.
VMAIter StripIterConstness(const VMAHandle& iter);
/// Marks as the specfied VMA as allocated.
VMAIter Allocate(VMAIter vma);
/**
* Carves a VMA of a specific size at the specified address by splitting Free VMAs while doing
* the appropriate error checking.
*/
VMAIter CarveVMA(GPUVAddr 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.
*/
VMAIter CarveVMARange(GPUVAddr 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);
/// Finds a free (unmapped region) of the specified size starting at the specified address.
GPUVAddr FindFreeRegion(GPUVAddr region_start, u64 size) const;
private:
static constexpr u64 page_bits{16};
static constexpr u64 page_size{1 << page_bits};
static constexpr u64 page_mask{page_size - 1};
/// Address space in bits, this is fairly arbitrary but sufficiently large.
static constexpr u32 address_space_width{39};
/// Start address for mapping, this is fairly arbitrary but must be non-zero.
static constexpr GPUVAddr address_space_base{0x100000};
/// End of address space, based on address space in bits.
static constexpr GPUVAddr address_space_end{1ULL << address_space_width};
Common::PageTable page_table{page_bits};
VMAMap vma_map;
};
} // namespace Tegra
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