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Merge pull request #2842 from Subv/switchable_page_table

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Kernel/Memory: Give each process its own page table and allow switching the current page table upon reschedule
This commit is contained in:
B3n30 2017-09-15 22:41:45 +02:00 • committed by GitHub
commit 813837c5cf
14 changed files with 191 additions and 123 deletions
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4
src/core/arm/dynarmic/arm_dynarmic.cpp
View file

@ -56,7 +56,9 @@ static Dynarmic::UserCallbacks GetUserCallbacks(
user_callbacks.memory.Write16 = &Memory::Write16;
user_callbacks.memory.Write32 = &Memory::Write32;
user_callbacks.memory.Write64 = &Memory::Write64;
user_callbacks.page_table = Memory::GetCurrentPageTablePointers();
// TODO(Subv): Re-add the page table pointers once dynarmic supports switching page tables at
// runtime.
user_callbacks.page_table = nullptr;
user_callbacks.coprocessors[15] = std::make_shared<DynarmicCP15>(interpeter_state);
return user_callbacks;
}

1
src/core/core.cpp
View file

@ -137,7 +137,6 @@ void System::Reschedule() {
}
System::ResultStatus System::Init(EmuWindow* emu_window, u32 system_mode) {
Memory::InitMemoryMap();
LOG_DEBUG(HW_Memory, "initialized OK");
if (Settings::values.use_cpu_jit) {

30
src/core/hle/kernel/memory.cpp
View file

@ -8,7 +8,6 @@
#include <memory>
#include <utility>
#include <vector>
#include "audio_core/audio_core.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "common/logging/log.h"
@ -24,7 +23,7 @@
namespace Kernel {
static MemoryRegionInfo memory_regions[3];
MemoryRegionInfo memory_regions[3];
/// Size of the APPLICATION, SYSTEM and BASE memory regions (respectively) for each system
/// memory configuration type.
@ -96,9 +95,6 @@ MemoryRegionInfo* GetMemoryRegion(MemoryRegion region) {
}
}
std::array<u8, Memory::VRAM_SIZE> vram;
std::array<u8, Memory::N3DS_EXTRA_RAM_SIZE> n3ds_extra_ram;
void HandleSpecialMapping(VMManager& address_space, const AddressMapping& mapping) {
using namespace Memory;
@ -143,30 +139,14 @@ void HandleSpecialMapping(VMManager& address_space, const AddressMapping& mappin
return;
}
// TODO(yuriks): Use GetPhysicalPointer when that becomes independent of the virtual
// mappings.
u8* target_pointer = nullptr;
switch (area->paddr_base) {
case VRAM_PADDR:
target_pointer = vram.data();
break;
case DSP_RAM_PADDR:
target_pointer = AudioCore::GetDspMemory().data();
break;
case N3DS_EXTRA_RAM_PADDR:
target_pointer = n3ds_extra_ram.data();
break;
default:
UNREACHABLE();
}
u8* target_pointer = Memory::GetPhysicalPointer(area->paddr_base + offset_into_region);
// TODO(yuriks): This flag seems to have some other effect, but it's unknown what
MemoryState memory_state = mapping.unk_flag ? MemoryState::Static : MemoryState::IO;
auto vma = address_space
.MapBackingMemory(mapping.address, target_pointer + offset_into_region,
mapping.size, memory_state)
.Unwrap();
auto vma =
address_space.MapBackingMemory(mapping.address, target_pointer, mapping.size, memory_state)
.Unwrap();
address_space.Reprotect(vma,
mapping.read_only ? VMAPermission::Read : VMAPermission::ReadWrite);
}

2
src/core/hle/kernel/memory.h
View file

@ -26,4 +26,6 @@ MemoryRegionInfo* GetMemoryRegion(MemoryRegion region);
void HandleSpecialMapping(VMManager& address_space, const AddressMapping& mapping);
void MapSharedPages(VMManager& address_space);
extern MemoryRegionInfo memory_regions[3];
} // namespace Kernel

12
src/core/hle/kernel/thread.cpp
View file

@ -171,6 +171,8 @@ static void SwitchContext(Thread* new_thread) {
// Cancel any outstanding wakeup events for this thread
CoreTiming::UnscheduleEvent(ThreadWakeupEventType, new_thread->callback_handle);
auto previous_process = Kernel::g_current_process;
current_thread = new_thread;
ready_queue.remove(new_thread->current_priority, new_thread);
@ -178,8 +180,18 @@ static void SwitchContext(Thread* new_thread) {
Core::CPU().LoadContext(new_thread->context);
Core::CPU().SetCP15Register(CP15_THREAD_URO, new_thread->GetTLSAddress());
if (previous_process != current_thread->owner_process) {
Kernel::g_current_process = current_thread->owner_process;
Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
// We have switched processes and thus, page tables, clear the instruction cache so we
// don't keep stale data from the previous process.
Core::CPU().ClearInstructionCache();
}
} else {
current_thread = nullptr;
// Note: We do not reset the current process and current page table when idling because
// technically we haven't changed processes, our threads are just paused.
}
}

13
src/core/hle/kernel/vm_manager.cpp
View file

@ -56,6 +56,10 @@ void VMManager::Reset() {
initial_vma.size = MAX_ADDRESS;
vma_map.emplace(initial_vma.base, initial_vma);
page_table.pointers.fill(nullptr);
page_table.attributes.fill(Memory::PageType::Unmapped);
page_table.cached_res_count.fill(0);
UpdatePageTableForVMA(initial_vma);
}
@ -328,16 +332,17 @@ VMManager::VMAIter VMManager::MergeAdjacent(VMAIter iter) {
void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
switch (vma.type) {
case VMAType::Free:
Memory::UnmapRegion(vma.base, vma.size);
Memory::UnmapRegion(page_table, vma.base, vma.size);
break;
case VMAType::AllocatedMemoryBlock:
Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_block->data() + vma.offset);
Memory::MapMemoryRegion(page_table, vma.base, vma.size,
vma.backing_block->data() + vma.offset);
break;
case VMAType::BackingMemory:
Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_memory);
Memory::MapMemoryRegion(page_table, vma.base, vma.size, vma.backing_memory);
break;
case VMAType::MMIO:
Memory::MapIoRegion(vma.base, vma.size, vma.mmio_handler);
Memory::MapIoRegion(page_table, vma.base, vma.size, vma.mmio_handler);
break;
}
}

6
src/core/hle/kernel/vm_manager.h
View file

@ -9,6 +9,7 @@
#include <vector>
#include "common/common_types.h"
#include "core/hle/result.h"
#include "core/memory.h"
#include "core/mmio.h"
namespace Kernel {
@ -102,7 +103,6 @@ struct VirtualMemoryArea {
* - http://duartes.org/gustavo/blog/post/page-cache-the-affair-between-memory-and-files/
*/
class VMManager final {
// TODO(yuriks): Make page tables switchable to support multiple VMManagers
public:
/**
* The maximum amount of address space managed by the kernel. Addresses above this are never
@ -184,6 +184,10 @@ public:
/// Dumps the address space layout to the log, for debugging
void LogLayout(Log::Level log_level) const;
/// Each VMManager has its own page table, which is set as the main one when the owning process
/// is scheduled.
Memory::PageTable page_table;
private:
using VMAIter = decltype(vma_map)::iterator;

1
src/core/loader/3dsx.cpp
View file

@ -270,6 +270,7 @@ ResultStatus AppLoader_THREEDSX::Load() {
Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
Kernel::g_current_process->svc_access_mask.set();
Kernel::g_current_process->address_mappings = default_address_mappings;
Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
// Attach the default resource limit (APPLICATION) to the process
Kernel::g_current_process->resource_limit =

1
src/core/loader/elf.cpp
View file

@ -397,6 +397,7 @@ ResultStatus AppLoader_ELF::Load() {
Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
Kernel::g_current_process->svc_access_mask.set();
Kernel::g_current_process->address_mappings = default_address_mappings;
Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
// Attach the default resource limit (APPLICATION) to the process
Kernel::g_current_process->resource_limit =

1
src/core/loader/ncch.cpp
View file

@ -172,6 +172,7 @@ ResultStatus AppLoader_NCCH::LoadExec() {
codeset->memory = std::make_shared<std::vector<u8>>(std::move(code));
Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
// Attach a resource limit to the process based on the resource limit category
Kernel::g_current_process->resource_limit =

153
src/core/memory.cpp
View file

@ -4,83 +4,31 @@
#include <array>
#include <cstring>
#include "audio_core/audio_core.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/hle/kernel/memory.h"
#include "core/hle/kernel/process.h"
#include "core/hle/lock.h"
#include "core/memory.h"
#include "core/memory_setup.h"
#include "core/mmio.h"
#include "video_core/renderer_base.h"
#include "video_core/video_core.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 regular memory, but also needs to check for rasterizer cache flushing and
/// invalidation
RasterizerCachedMemory,
/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
Special,
/// Page is mapped to a I/O region, but also needs to check for rasterizer cache flushing and
/// invalidation
RasterizerCachedSpecial,
};
static std::array<u8, Memory::VRAM_SIZE> vram;
static std::array<u8, Memory::N3DS_EXTRA_RAM_SIZE> n3ds_extra_ram;
struct SpecialRegion {
VAddr base;
u32 size;
MMIORegionPointer handler;
};
/**
* A (reasonably) fast way of allowing switchable and remappable 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 accessing. In the usual case of an access to regular memory, it only
* requires an indexed fetch and a check for NULL.
*/
struct PageTable {
/**
* 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*, PAGE_TABLE_NUM_ENTRIES> pointers;
/**
* Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of
* type `Special`.
*/
std::vector<SpecialRegion> special_regions;
/**
* Array of fine grained page attributes. If it is set to any value other than `Memory`, then
* the corresponding entry in `pointers` MUST be set to null.
*/
std::array<PageType, PAGE_TABLE_NUM_ENTRIES> attributes;
/**
* Indicates the number of externally cached resources touching a page that should be
* flushed before the memory is accessed
*/
std::array<u8, PAGE_TABLE_NUM_ENTRIES> cached_res_count;
};
/// 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;
PageTable* current_page_table = nullptr;
std::array<u8*, PAGE_TABLE_NUM_ENTRIES>* GetCurrentPageTablePointers() {
return &current_page_table->pointers;
}
static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
static void MapPages(PageTable& page_table, 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);
@ -91,9 +39,9 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
while (base != end) {
ASSERT_MSG(base < PAGE_TABLE_NUM_ENTRIES, "out of range mapping at %08X", base);
current_page_table->attributes[base] = type;
current_page_table->pointers[base] = memory;
current_page_table->cached_res_count[base] = 0;
page_table.attributes[base] = type;
page_table.pointers[base] = memory;
page_table.cached_res_count[base] = 0;
base += 1;
if (memory != nullptr)
@ -101,30 +49,24 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
}
}
void InitMemoryMap() {
main_page_table.pointers.fill(nullptr);
main_page_table.attributes.fill(PageType::Unmapped);
main_page_table.cached_res_count.fill(0);
}
void MapMemoryRegion(VAddr base, u32 size, u8* target) {
void MapMemoryRegion(PageTable& page_table, 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);
MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, target, PageType::Memory);
}
void MapIoRegion(VAddr base, u32 size, MMIORegionPointer mmio_handler) {
void MapIoRegion(PageTable& page_table, VAddr base, u32 size, MMIORegionPointer mmio_handler) {
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);
MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special);
current_page_table->special_regions.emplace_back(SpecialRegion{base, size, mmio_handler});
page_table.special_regions.emplace_back(SpecialRegion{base, size, mmio_handler});
}
void UnmapRegion(VAddr base, u32 size) {
void UnmapRegion(PageTable& page_table, 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);
MapPages(page_table, base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped);
}
/**
@ -273,8 +215,7 @@ bool IsValidVirtualAddress(const VAddr vaddr) {
}
bool IsValidPhysicalAddress(const PAddr paddr) {
boost::optional<VAddr> vaddr = PhysicalToVirtualAddress(paddr);
return vaddr && IsValidVirtualAddress(*vaddr);
return GetPhysicalPointer(paddr) != nullptr;
}
u8* GetPointer(const VAddr vaddr) {
@ -306,9 +247,63 @@ std::string ReadCString(VAddr vaddr, std::size_t max_length) {
}
u8* GetPhysicalPointer(PAddr address) {
// TODO(Subv): This call should not go through the application's memory mapping.
boost::optional<VAddr> vaddr = PhysicalToVirtualAddress(address);
return vaddr ? GetPointer(*vaddr) : nullptr;
struct MemoryArea {
PAddr paddr_base;
u32 size;
};
static constexpr MemoryArea memory_areas[] = {
{VRAM_PADDR, VRAM_SIZE},
{IO_AREA_PADDR, IO_AREA_SIZE},
{DSP_RAM_PADDR, DSP_RAM_SIZE},
{FCRAM_PADDR, FCRAM_N3DS_SIZE},
{N3DS_EXTRA_RAM_PADDR, N3DS_EXTRA_RAM_SIZE},
};
const auto area =
std::find_if(std::begin(memory_areas), std::end(memory_areas), [&](const auto& area) {
return address >= area.paddr_base && address < area.paddr_base + area.size;
});
if (area == std::end(memory_areas)) {
LOG_ERROR(HW_Memory, "unknown GetPhysicalPointer @ 0x%08X", address);
return nullptr;
}
if (area->paddr_base == IO_AREA_PADDR) {
LOG_ERROR(HW_Memory, "MMIO mappings are not supported yet. phys_addr=0x%08X", address);
return nullptr;
}
u32 offset_into_region = address - area->paddr_base;
u8* target_pointer = nullptr;
switch (area->paddr_base) {
case VRAM_PADDR:
target_pointer = vram.data() + offset_into_region;
break;
case DSP_RAM_PADDR:
target_pointer = AudioCore::GetDspMemory().data() + offset_into_region;
break;
case FCRAM_PADDR:
for (const auto& region : Kernel::memory_regions) {
if (offset_into_region >= region.base &&
offset_into_region < region.base + region.size) {
target_pointer =
region.linear_heap_memory->data() + offset_into_region - region.base;
break;
}
}
ASSERT_MSG(target_pointer != nullptr, "Invalid FCRAM address");
break;
case N3DS_EXTRA_RAM_PADDR:
target_pointer = n3ds_extra_ram.data() + offset_into_region;
break;
default:
UNREACHABLE();
}
return target_pointer;
}
void RasterizerMarkRegionCached(PAddr start, u32 size, int count_delta) {

62
src/core/memory.h
View file

@ -7,8 +7,10 @@
#include <array>
#include <cstddef>
#include <string>
#include <vector>
#include <boost/optional.hpp>
#include "common/common_types.h"
#include "core/mmio.h"
namespace Memory {
@ -21,6 +23,59 @@ const u32 PAGE_MASK = PAGE_SIZE - 1;
const int PAGE_BITS = 12;
const size_t PAGE_TABLE_NUM_ENTRIES = 1 << (32 - PAGE_BITS);
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 regular memory, but also needs to check for rasterizer cache flushing and
/// invalidation
RasterizerCachedMemory,
/// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
Special,
/// Page is mapped to a I/O region, but also needs to check for rasterizer cache flushing and
/// invalidation
RasterizerCachedSpecial,
};
struct SpecialRegion {
VAddr base;
u32 size;
MMIORegionPointer handler;
};
/**
* A (reasonably) fast way of allowing switchable and remappable 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 accessing. In the usual case of an access to regular memory, it only
* requires an indexed fetch and a check for NULL.
*/
struct PageTable {
/**
* 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*, PAGE_TABLE_NUM_ENTRIES> pointers;
/**
* Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of
* type `Special`.
*/
std::vector<SpecialRegion> special_regions;
/**
* Array of fine grained page attributes. If it is set to any value other than `Memory`, then
* the corresponding entry in `pointers` MUST be set to null.
*/
std::array<PageType, PAGE_TABLE_NUM_ENTRIES> attributes;
/**
* Indicates the number of externally cached resources touching a page that should be
* flushed before the memory is accessed
*/
std::array<u8, PAGE_TABLE_NUM_ENTRIES> cached_res_count;
};
/// Physical memory regions as seen from the ARM11
enum : PAddr {
/// IO register area
@ -126,6 +181,9 @@ enum : VAddr {
NEW_LINEAR_HEAP_VADDR_END = NEW_LINEAR_HEAP_VADDR + NEW_LINEAR_HEAP_SIZE,
};
/// Currently active page table
extern PageTable* current_page_table;
bool IsValidVirtualAddress(const VAddr addr);
bool IsValidPhysicalAddress(const PAddr addr);
@ -169,8 +227,6 @@ boost::optional<VAddr> PhysicalToVirtualAddress(PAddr addr);
/**
* Gets a pointer to the memory region beginning at the specified physical address.
*
* @note This is currently implemented using PhysicalToVirtualAddress().
*/
u8* GetPhysicalPointer(PAddr address);
@ -209,4 +265,4 @@ void RasterizerFlushVirtualRegion(VAddr start, u32 size, FlushMode mode);
* retrieve the current page table for that purpose.
*/
std::array<u8*, PAGE_TABLE_NUM_ENTRIES>* GetCurrentPageTablePointers();
}
} // namespace Memory

10
src/core/memory_setup.h
View file

@ -9,24 +9,24 @@
namespace Memory {
void InitMemoryMap();
/**
* Maps an allocated buffer onto a region of the emulated process address space.
*
* @param page_table The page table of the emulated process.
* @param base The address to start mapping at. Must be page-aligned.
* @param size The amount of bytes to map. Must be page-aligned.
* @param target Buffer with the memory backing the mapping. Must be of length at least `size`.
*/
void MapMemoryRegion(VAddr base, u32 size, u8* target);
void MapMemoryRegion(PageTable& page_table, VAddr base, u32 size, u8* target);
/**
* Maps a region of the emulated process address space as a IO region.
* @param page_table The page table of the emulated process.
* @param base The address to start mapping at. Must be page-aligned.
* @param size The amount of bytes to map. Must be page-aligned.
* @param mmio_handler The handler that backs the mapping.
*/
void MapIoRegion(VAddr base, u32 size, MMIORegionPointer mmio_handler);
void MapIoRegion(PageTable& page_table, VAddr base, u32 size, MMIORegionPointer mmio_handler);
void UnmapRegion(VAddr base, u32 size);
void UnmapRegion(PageTable& page_table, VAddr base, u32 size);
}

18
src/tests/core/arm/arm_test_common.cpp
View file

@ -3,20 +3,30 @@
// Refer to the license.txt file included.
#include "core/core.h"
#include "core/memory.h"
#include "core/memory_setup.h"
#include "tests/core/arm/arm_test_common.h"
namespace ArmTests {
static Memory::PageTable page_table;
TestEnvironment::TestEnvironment(bool mutable_memory_)
: mutable_memory(mutable_memory_), test_memory(std::make_shared<TestMemory>(this)) {
Memory::MapIoRegion(0x00000000, 0x80000000, test_memory);
Memory::MapIoRegion(0x80000000, 0x80000000, test_memory);
page_table.pointers.fill(nullptr);
page_table.attributes.fill(Memory::PageType::Unmapped);
page_table.cached_res_count.fill(0);
Memory::MapIoRegion(page_table, 0x00000000, 0x80000000, test_memory);
Memory::MapIoRegion(page_table, 0x80000000, 0x80000000, test_memory);
Memory::current_page_table = &page_table;
}
TestEnvironment::~TestEnvironment() {
Memory::UnmapRegion(0x80000000, 0x80000000);
Memory::UnmapRegion(0x00000000, 0x80000000);
Memory::UnmapRegion(page_table, 0x80000000, 0x80000000);
Memory::UnmapRegion(page_table, 0x00000000, 0x80000000);
}
void TestEnvironment::SetMemory64(VAddr vaddr, u64 value) {