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https://github.com/PabloMK7/citra.git
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232 lines
7.5 KiB
C++
232 lines
7.5 KiB
C++
// Copyright 2015 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <array>
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#include <cstring>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "common/swap.h"
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#include "core/hle/kernel/process.h"
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#include "core/memory.h"
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#include "core/memory_setup.h"
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namespace Memory {
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enum class PageType {
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/// Page is unmapped and should cause an access error.
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Unmapped,
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/// Page is mapped to regular memory. This is the only type you can get pointers to.
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Memory,
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/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
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Special,
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};
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/**
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* A (reasonably) fast way of allowing switchable and remappable process address spaces. It loosely
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* mimics the way a real CPU page table works, but instead is optimized for minimal decoding and
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* fetching requirements when accessing. In the usual case of an access to regular memory, it only
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* requires an indexed fetch and a check for NULL.
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*/
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struct PageTable {
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static const size_t NUM_ENTRIES = 1 << (32 - PAGE_BITS);
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/**
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* Array of memory pointers backing each page. An entry can only be non-null if the
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* corresponding entry in the `attributes` array is of type `Memory`.
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*/
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std::array<u8*, NUM_ENTRIES> pointers;
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/**
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* Array of fine grained page attributes. If it is set to any value other than `Memory`, then
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* the corresponding entry in `pointer` MUST be set to null.
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*/
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std::array<PageType, NUM_ENTRIES> attributes;
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};
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/// Singular page table used for the singleton process
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static PageTable main_page_table;
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/// Currently active page table
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static PageTable* current_page_table = &main_page_table;
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static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
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LOG_DEBUG(HW_Memory, "Mapping %p onto %08X-%08X", memory, base * PAGE_SIZE, (base + size) * PAGE_SIZE);
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u32 end = base + size;
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while (base != end) {
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ASSERT_MSG(base < PageTable::NUM_ENTRIES, "out of range mapping at %08X", base);
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current_page_table->attributes[base] = type;
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current_page_table->pointers[base] = memory;
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base += 1;
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if (memory != nullptr)
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memory += PAGE_SIZE;
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}
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}
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void InitMemoryMap() {
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main_page_table.pointers.fill(nullptr);
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main_page_table.attributes.fill(PageType::Unmapped);
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}
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void MapMemoryRegion(VAddr base, u32 size, u8* target) {
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ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
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ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
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MapPages(base / PAGE_SIZE, size / PAGE_SIZE, target, PageType::Memory);
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}
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void MapIoRegion(VAddr base, u32 size) {
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ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
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ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
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MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special);
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}
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void UnmapRegion(VAddr base, u32 size) {
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ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
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ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
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MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped);
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}
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template <typename T>
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T Read(const VAddr vaddr) {
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const u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
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if (page_pointer) {
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T value;
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std::memcpy(&value, &page_pointer[vaddr & PAGE_MASK], sizeof(T));
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return value;
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}
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PageType type = current_page_table->attributes[vaddr >> PAGE_BITS];
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switch (type) {
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case PageType::Unmapped:
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LOG_ERROR(HW_Memory, "unmapped Read%lu @ 0x%08X", sizeof(T) * 8, vaddr);
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return 0;
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case PageType::Memory:
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ASSERT_MSG(false, "Mapped memory page without a pointer @ %08X", vaddr);
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case PageType::Special:
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LOG_ERROR(HW_Memory, "I/O reads aren't implemented yet @ %08X", vaddr);
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return 0;
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default:
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UNREACHABLE();
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}
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}
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template <typename T>
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void Write(const VAddr vaddr, const T data) {
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u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
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if (page_pointer) {
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std::memcpy(&page_pointer[vaddr & PAGE_MASK], &data, sizeof(T));
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return;
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}
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PageType type = current_page_table->attributes[vaddr >> PAGE_BITS];
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switch (type) {
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case PageType::Unmapped:
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LOG_ERROR(HW_Memory, "unmapped Write%lu 0x%08X @ 0x%08X", sizeof(data) * 8, (u32) data, vaddr);
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return;
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case PageType::Memory:
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ASSERT_MSG(false, "Mapped memory page without a pointer @ %08X", vaddr);
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case PageType::Special:
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LOG_ERROR(HW_Memory, "I/O writes aren't implemented yet @ %08X", vaddr);
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return;
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default:
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UNREACHABLE();
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}
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}
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u8* GetPointer(const VAddr vaddr) {
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u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
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if (page_pointer) {
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return page_pointer + (vaddr & PAGE_MASK);
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}
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LOG_ERROR(HW_Memory, "unknown GetPointer @ 0x%08x", vaddr);
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return nullptr;
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}
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u8* GetPhysicalPointer(PAddr address) {
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return GetPointer(PhysicalToVirtualAddress(address));
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}
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u8 Read8(const VAddr addr) {
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return Read<u8>(addr);
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}
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u16 Read16(const VAddr addr) {
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return Read<u16_le>(addr);
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}
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u32 Read32(const VAddr addr) {
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return Read<u32_le>(addr);
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}
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u64 Read64(const VAddr addr) {
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return Read<u64_le>(addr);
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}
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void Write8(const VAddr addr, const u8 data) {
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Write<u8>(addr, data);
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}
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void Write16(const VAddr addr, const u16 data) {
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Write<u16_le>(addr, data);
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}
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void Write32(const VAddr addr, const u32 data) {
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Write<u32_le>(addr, data);
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}
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void Write64(const VAddr addr, const u64 data) {
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Write<u64_le>(addr, data);
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}
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void WriteBlock(const VAddr addr, const u8* data, const size_t size) {
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for (u32 offset = 0; offset < size; offset++) {
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Write8(addr + offset, data[offset]);
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}
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}
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PAddr VirtualToPhysicalAddress(const VAddr addr) {
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if (addr == 0) {
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return 0;
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} else if (addr >= VRAM_VADDR && addr < VRAM_VADDR_END) {
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return addr - VRAM_VADDR + VRAM_PADDR;
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} else if (addr >= LINEAR_HEAP_VADDR && addr < LINEAR_HEAP_VADDR_END) {
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return addr - LINEAR_HEAP_VADDR + FCRAM_PADDR;
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} else if (addr >= DSP_RAM_VADDR && addr < DSP_RAM_VADDR_END) {
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return addr - DSP_RAM_VADDR + DSP_RAM_PADDR;
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} else if (addr >= IO_AREA_VADDR && addr < IO_AREA_VADDR_END) {
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return addr - IO_AREA_VADDR + IO_AREA_PADDR;
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} else if (addr >= NEW_LINEAR_HEAP_VADDR && addr < NEW_LINEAR_HEAP_VADDR_END) {
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return addr - NEW_LINEAR_HEAP_VADDR + FCRAM_PADDR;
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}
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LOG_ERROR(HW_Memory, "Unknown virtual address @ 0x%08X", addr);
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// To help with debugging, set bit on address so that it's obviously invalid.
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return addr | 0x80000000;
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}
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VAddr PhysicalToVirtualAddress(const PAddr addr) {
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if (addr == 0) {
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return 0;
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} else if (addr >= VRAM_PADDR && addr < VRAM_PADDR_END) {
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return addr - VRAM_PADDR + VRAM_VADDR;
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} else if (addr >= FCRAM_PADDR && addr < FCRAM_PADDR_END) {
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return addr - FCRAM_PADDR + Kernel::g_current_process->GetLinearHeapBase();
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} else if (addr >= DSP_RAM_PADDR && addr < DSP_RAM_PADDR_END) {
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return addr - DSP_RAM_PADDR + DSP_RAM_VADDR;
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} else if (addr >= IO_AREA_PADDR && addr < IO_AREA_PADDR_END) {
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return addr - IO_AREA_PADDR + IO_AREA_VADDR;
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}
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LOG_ERROR(HW_Memory, "Unknown physical address @ 0x%08X", addr);
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// To help with debugging, set bit on address so that it's obviously invalid.
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return addr | 0x80000000;
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}
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} // namespace
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