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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 <vector>
#include "common/common_types.h"
namespace VideoCore {
class RasterizerInterface;
}
namespace Core {
class System;
}
namespace Tegra {
class PageEntry final {
public:
enum class State : u32 {
Unmapped = static_cast<u32>(-1),
Allocated = static_cast<u32>(-2),
};
constexpr PageEntry() = default;
constexpr PageEntry(State state) : state{state} {}
constexpr PageEntry(VAddr addr) : state{static_cast<State>(addr >> ShiftBits)} {}
constexpr bool IsUnmapped() const {
return state == State::Unmapped;
}
constexpr bool IsAllocated() const {
return state == State::Allocated;
}
constexpr bool IsValid() const {
return !IsUnmapped() && !IsAllocated();
}
constexpr VAddr ToAddress() const {
if (!IsValid()) {
return {};
}
return static_cast<VAddr>(state) << ShiftBits;
}
constexpr PageEntry operator+(u64 offset) {
// If this is a reserved value, offsets do not apply
if (!IsValid()) {
return *this;
}
return PageEntry{(static_cast<VAddr>(state) << ShiftBits) + offset};
}
private:
static constexpr std::size_t ShiftBits{12};
State state{State::Unmapped};
};
static_assert(sizeof(PageEntry) == 4, "PageEntry is too large");
class MemoryManager final {
public:
explicit MemoryManager(Core::System& system, VideoCore::RasterizerInterface& rasterizer);
~MemoryManager();
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;
/**
* ReadBlock and WriteBlock are full read and write operations over virtual
* GPU Memory. It's important to use these when GPU memory may not be continuous
* in the Host Memory counterpart. Note: This functions cause Host GPU Memory
* Flushes and Invalidations, respectively to each operation.
*/
void ReadBlock(GPUVAddr gpu_src_addr, void* dest_buffer, std::size_t size) const;
void WriteBlock(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size);
void CopyBlock(GPUVAddr gpu_dest_addr, GPUVAddr gpu_src_addr, std::size_t size);
/**
* ReadBlockUnsafe and WriteBlockUnsafe are special versions of ReadBlock and
* WriteBlock respectively. In this versions, no flushing or invalidation is actually
* done and their performance is similar to a memcpy. This functions can be used
* on either of this 2 scenarios instead of their safe counterpart:
* - Memory which is sure to never be represented in the Host GPU.
* - Memory Managed by a Cache Manager. Example: Texture Flushing should use
* WriteBlockUnsafe instead of WriteBlock since it shouldn't invalidate the texture
* being flushed.
*/
void ReadBlockUnsafe(GPUVAddr gpu_src_addr, void* dest_buffer, std::size_t size) const;
void WriteBlockUnsafe(GPUVAddr gpu_dest_addr, const void* src_buffer, std::size_t size);
void CopyBlockUnsafe(GPUVAddr gpu_dest_addr, GPUVAddr gpu_src_addr, std::size_t size);
/**
* IsGranularRange checks if a gpu region can be simply read with a pointer.
*/
bool IsGranularRange(GPUVAddr gpu_addr, std::size_t size);
GPUVAddr Map(VAddr cpu_addr, GPUVAddr gpu_addr, std::size_t size);
GPUVAddr MapAllocate(VAddr cpu_addr, std::size_t size, std::size_t align);
std::optional<GPUVAddr> AllocateFixed(GPUVAddr gpu_addr, std::size_t size);
GPUVAddr Allocate(std::size_t size, std::size_t align);
void Unmap(GPUVAddr gpu_addr, std::size_t size);
private:
PageEntry GetPageEntry(GPUVAddr gpu_addr) const;
void SetPageEntry(GPUVAddr gpu_addr, PageEntry page_entry, std::size_t size = page_size);
GPUVAddr UpdateRange(GPUVAddr gpu_addr, PageEntry page_entry, std::size_t size);
std::optional<GPUVAddr> FindFreeRange(std::size_t size, std::size_t align) const;
void TryLockPage(PageEntry page_entry, std::size_t size);
void TryUnlockPage(PageEntry page_entry, std::size_t size);
static constexpr std::size_t PageEntryIndex(GPUVAddr gpu_addr) {
return (gpu_addr >> page_bits) & page_table_mask;
}
static constexpr u64 address_space_size = 1ULL << 40;
static constexpr u64 address_space_start = 1ULL << 32;
static constexpr u64 page_bits{16};
static constexpr u64 page_size{1 << page_bits};
static constexpr u64 page_mask{page_size - 1};
static constexpr u64 page_table_bits{24};
static constexpr u64 page_table_size{1 << page_table_bits};
static constexpr u64 page_table_mask{page_table_size - 1};
Core::System& system;
VideoCore::RasterizerInterface& rasterizer;
std::vector<PageEntry> page_table;
};
} // namespace Tegra
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