yuzu/src/core/memory.cpp
Yuri Kunde Schlesner 74d4bc0af1 Kernel: Add more infrastructure to support different memory layouts
This adds some structures necessary to support multiple memory regions
in the future. It also adds support for different system memory types
and the new linear heap mapping at 0x30000000.
2015-08-16 01:03:47 -03:00

240 lines
7.6 KiB
C++

// Copyright 2015 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/hle/kernel/process.h"
#include "core/memory.h"
#include "core/memory_setup.h"
namespace Memory {
enum class PageType {
/// Page is unmapped and should cause an access error.
Unmapped,
/// Page is mapped to regular memory. This is the only type you can get pointers to.
Memory,
/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
Special,
};
/**
* A (reasonably) fast way of allowing switchable and remmapable process address spaces. It loosely
* mimics the way a real CPU page table works, but instead is optimized for minimal decoding and
* fetching requirements when acessing. In the usual case of an access to regular memory, it only
* requires an indexed fetch and a check for NULL.
*/
struct PageTable {
static const size_t NUM_ENTRIES = 1 << (32 - PAGE_BITS);
/**
* Array of memory pointers backing each page. An entry can only be non-null if the
* corresponding entry in the `attributes` array is of type `Memory`.
*/
std::array<u8*, NUM_ENTRIES> pointers;
/**
* Array of fine grained page attributes. If it is set to any value other than `Memory`, then
* the corresponding entry in `pointer` MUST be set to null.
*/
std::array<PageType, NUM_ENTRIES> attributes;
};
/// Singular page table used for the singleton process
static PageTable main_page_table;
/// Currently active page table
static PageTable* current_page_table = &main_page_table;
static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
LOG_DEBUG(HW_Memory, "Mapping %p onto %08X-%08X", memory, base * PAGE_SIZE, (base + size) * PAGE_SIZE);
u32 end = base + size;
while (base != end) {
ASSERT_MSG(base < PageTable::NUM_ENTRIES, "out of range mapping at %08X", base);
current_page_table->attributes[base] = type;
current_page_table->pointers[base] = memory;
base += 1;
if (memory != nullptr)
memory += PAGE_SIZE;
}
}
void InitMemoryMap() {
main_page_table.pointers.fill(nullptr);
main_page_table.attributes.fill(PageType::Unmapped);
}
void MapMemoryRegion(VAddr base, u32 size, u8* target) {
ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
MapPages(base / PAGE_SIZE, size / PAGE_SIZE, target, PageType::Memory);
}
void MapIoRegion(VAddr base, u32 size) {
ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special);
}
void UnmapRegion(VAddr base, u32 size) {
ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped);
}
template <typename T>
T Read(const VAddr vaddr) {
const u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
if (page_pointer) {
return *reinterpret_cast<const T*>(page_pointer + (vaddr & PAGE_MASK));
}
PageType type = current_page_table->attributes[vaddr >> PAGE_BITS];
switch (type) {
case PageType::Unmapped:
LOG_ERROR(HW_Memory, "unmapped Read%lu @ 0x%08X", sizeof(T) * 8, vaddr);
return 0;
case PageType::Memory:
ASSERT_MSG(false, "Mapped memory page without a pointer @ %08X", vaddr);
case PageType::Special:
LOG_ERROR(HW_Memory, "I/O reads aren't implemented yet @ %08X", vaddr);
return 0;
default:
UNREACHABLE();
}
}
template <typename T>
void Write(const VAddr vaddr, const T data) {
u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
if (page_pointer) {
*reinterpret_cast<T*>(page_pointer + (vaddr & PAGE_MASK)) = data;
return;
}
PageType type = current_page_table->attributes[vaddr >> PAGE_BITS];
switch (type) {
case PageType::Unmapped:
LOG_ERROR(HW_Memory, "unmapped Write%lu 0x%08X @ 0x%08X", sizeof(data) * 8, (u32) data, vaddr);
return;
case PageType::Memory:
ASSERT_MSG(false, "Mapped memory page without a pointer @ %08X", vaddr);
case PageType::Special:
LOG_ERROR(HW_Memory, "I/O writes aren't implemented yet @ %08X", vaddr);
return;
default:
UNREACHABLE();
}
}
u8* GetPointer(const VAddr vaddr) {
u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
if (page_pointer) {
return page_pointer + (vaddr & PAGE_MASK);
}
LOG_ERROR(HW_Memory, "unknown GetPointer @ 0x%08x", vaddr);
return nullptr;
}
u8* GetPhysicalPointer(PAddr address) {
return GetPointer(PhysicalToVirtualAddress(address));
}
u8 Read8(const VAddr addr) {
return Read<u8>(addr);
}
u16 Read16(const VAddr addr) {
return Read<u16_le>(addr);
}
u32 Read32(const VAddr addr) {
return Read<u32_le>(addr);
}
u64 Read64(const VAddr addr) {
return Read<u64_le>(addr);
}
void Write8(const VAddr addr, const u8 data) {
Write<u8>(addr, data);
}
void Write16(const VAddr addr, const u16 data) {
Write<u16_le>(addr, data);
}
void Write32(const VAddr addr, const u32 data) {
Write<u32_le>(addr, data);
}
void Write64(const VAddr addr, const u64 data) {
Write<u64_le>(addr, data);
}
void WriteBlock(const VAddr addr, const u8* data, const size_t size) {
u32 offset = 0;
while (offset < (size & ~3)) {
Write32(addr + offset, *(u32*)&data[offset]);
offset += 4;
}
if (size & 2) {
Write16(addr + offset, *(u16*)&data[offset]);
offset += 2;
}
if (size & 1)
Write8(addr + offset, data[offset]);
}
PAddr VirtualToPhysicalAddress(const VAddr addr) {
if (addr == 0) {
return 0;
} else if (addr >= VRAM_VADDR && addr < VRAM_VADDR_END) {
return addr - VRAM_VADDR + VRAM_PADDR;
} else if (addr >= LINEAR_HEAP_VADDR && addr < LINEAR_HEAP_VADDR_END) {
return addr - LINEAR_HEAP_VADDR + FCRAM_PADDR;
} else if (addr >= DSP_RAM_VADDR && addr < DSP_RAM_VADDR_END) {
return addr - DSP_RAM_VADDR + DSP_RAM_PADDR;
} else if (addr >= IO_AREA_VADDR && addr < IO_AREA_VADDR_END) {
return addr - IO_AREA_VADDR + IO_AREA_PADDR;
} else if (addr >= NEW_LINEAR_HEAP_VADDR && addr < NEW_LINEAR_HEAP_VADDR_END) {
return addr - NEW_LINEAR_HEAP_VADDR + FCRAM_PADDR;
}
LOG_ERROR(HW_Memory, "Unknown virtual address @ 0x%08X", addr);
// To help with debugging, set bit on address so that it's obviously invalid.
return addr | 0x80000000;
}
VAddr PhysicalToVirtualAddress(const PAddr addr) {
if (addr == 0) {
return 0;
} else if (addr >= VRAM_PADDR && addr < VRAM_PADDR_END) {
return addr - VRAM_PADDR + VRAM_VADDR;
} else if (addr >= FCRAM_PADDR && addr < FCRAM_PADDR_END) {
return addr - FCRAM_PADDR + Kernel::g_current_process->GetLinearHeapBase();
} else if (addr >= DSP_RAM_PADDR && addr < DSP_RAM_PADDR_END) {
return addr - DSP_RAM_PADDR + DSP_RAM_VADDR;
} else if (addr >= IO_AREA_PADDR && addr < IO_AREA_PADDR_END) {
return addr - IO_AREA_PADDR + IO_AREA_VADDR;
}
LOG_ERROR(HW_Memory, "Unknown physical address @ 0x%08X", addr);
// To help with debugging, set bit on address so that it's obviously invalid.
return addr | 0x80000000;
}
} // namespace