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|
// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/alignment.h"
#include "common/assert.h"
#include "common/literals.h"
#include "common/scope_exit.h"
#include "core/core.h"
#include "core/hle/kernel/k_address_space_info.h"
#include "core/hle/kernel/k_memory_block.h"
#include "core/hle/kernel/k_memory_block_manager.h"
#include "core/hle/kernel/k_page_linked_list.h"
#include "core/hle/kernel/k_page_table.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_resource_limit.h"
#include "core/hle/kernel/k_scoped_resource_reservation.h"
#include "core/hle/kernel/k_system_control.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/svc_results.h"
#include "core/memory.h"
namespace Kernel {
namespace {
using namespace Common::Literals;
constexpr std::size_t GetAddressSpaceWidthFromType(FileSys::ProgramAddressSpaceType as_type) {
switch (as_type) {
case FileSys::ProgramAddressSpaceType::Is32Bit:
case FileSys::ProgramAddressSpaceType::Is32BitNoMap:
return 32;
case FileSys::ProgramAddressSpaceType::Is36Bit:
return 36;
case FileSys::ProgramAddressSpaceType::Is39Bit:
return 39;
default:
UNREACHABLE();
return {};
}
}
constexpr u64 GetAddressInRange(const KMemoryInfo& info, VAddr addr) {
if (info.GetAddress() < addr) {
return addr;
}
return info.GetAddress();
}
constexpr std::size_t GetSizeInRange(const KMemoryInfo& info, VAddr start, VAddr end) {
std::size_t size{info.GetSize()};
if (info.GetAddress() < start) {
size -= start - info.GetAddress();
}
if (info.GetEndAddress() > end) {
size -= info.GetEndAddress() - end;
}
return size;
}
} // namespace
KPageTable::KPageTable(Core::System& system_) : system{system_} {}
ResultCode KPageTable::InitializeForProcess(FileSys::ProgramAddressSpaceType as_type,
bool enable_aslr, VAddr code_addr,
std::size_t code_size, KMemoryManager::Pool pool) {
const auto GetSpaceStart = [this](KAddressSpaceInfo::Type type) {
return KAddressSpaceInfo::GetAddressSpaceStart(address_space_width, type);
};
const auto GetSpaceSize = [this](KAddressSpaceInfo::Type type) {
return KAddressSpaceInfo::GetAddressSpaceSize(address_space_width, type);
};
// Set our width and heap/alias sizes
address_space_width = GetAddressSpaceWidthFromType(as_type);
const VAddr start = 0;
const VAddr end{1ULL << address_space_width};
std::size_t alias_region_size{GetSpaceSize(KAddressSpaceInfo::Type::Alias)};
std::size_t heap_region_size{GetSpaceSize(KAddressSpaceInfo::Type::Heap)};
ASSERT(start <= code_addr);
ASSERT(code_addr < code_addr + code_size);
ASSERT(code_addr + code_size - 1 <= end - 1);
// Adjust heap/alias size if we don't have an alias region
if (as_type == FileSys::ProgramAddressSpaceType::Is32BitNoMap) {
heap_region_size += alias_region_size;
alias_region_size = 0;
}
// Set code regions and determine remaining
constexpr std::size_t RegionAlignment{2_MiB};
VAddr process_code_start{};
VAddr process_code_end{};
std::size_t stack_region_size{};
std::size_t kernel_map_region_size{};
if (address_space_width == 39) {
alias_region_size = GetSpaceSize(KAddressSpaceInfo::Type::Alias);
heap_region_size = GetSpaceSize(KAddressSpaceInfo::Type::Heap);
stack_region_size = GetSpaceSize(KAddressSpaceInfo::Type::Stack);
kernel_map_region_size = GetSpaceSize(KAddressSpaceInfo::Type::MapSmall);
code_region_start = GetSpaceStart(KAddressSpaceInfo::Type::Map39Bit);
code_region_end = code_region_start + GetSpaceSize(KAddressSpaceInfo::Type::Map39Bit);
alias_code_region_start = code_region_start;
alias_code_region_end = code_region_end;
process_code_start = Common::AlignDown(code_addr, RegionAlignment);
process_code_end = Common::AlignUp(code_addr + code_size, RegionAlignment);
} else {
stack_region_size = 0;
kernel_map_region_size = 0;
code_region_start = GetSpaceStart(KAddressSpaceInfo::Type::MapSmall);
code_region_end = code_region_start + GetSpaceSize(KAddressSpaceInfo::Type::MapSmall);
stack_region_start = code_region_start;
alias_code_region_start = code_region_start;
alias_code_region_end = GetSpaceStart(KAddressSpaceInfo::Type::MapLarge) +
GetSpaceSize(KAddressSpaceInfo::Type::MapLarge);
stack_region_end = code_region_end;
kernel_map_region_start = code_region_start;
kernel_map_region_end = code_region_end;
process_code_start = code_region_start;
process_code_end = code_region_end;
}
// Set other basic fields
is_aslr_enabled = enable_aslr;
address_space_start = start;
address_space_end = end;
is_kernel = false;
// Determine the region we can place our undetermineds in
VAddr alloc_start{};
std::size_t alloc_size{};
if ((process_code_start - code_region_start) >= (end - process_code_end)) {
alloc_start = code_region_start;
alloc_size = process_code_start - code_region_start;
} else {
alloc_start = process_code_end;
alloc_size = end - process_code_end;
}
const std::size_t needed_size{
(alias_region_size + heap_region_size + stack_region_size + kernel_map_region_size)};
if (alloc_size < needed_size) {
UNREACHABLE();
return ResultOutOfMemory;
}
const std::size_t remaining_size{alloc_size - needed_size};
// Determine random placements for each region
std::size_t alias_rnd{}, heap_rnd{}, stack_rnd{}, kmap_rnd{};
if (enable_aslr) {
alias_rnd = KSystemControl::GenerateRandomRange(0, remaining_size / RegionAlignment) *
RegionAlignment;
heap_rnd = KSystemControl::GenerateRandomRange(0, remaining_size / RegionAlignment) *
RegionAlignment;
stack_rnd = KSystemControl::GenerateRandomRange(0, remaining_size / RegionAlignment) *
RegionAlignment;
kmap_rnd = KSystemControl::GenerateRandomRange(0, remaining_size / RegionAlignment) *
RegionAlignment;
}
// Setup heap and alias regions
alias_region_start = alloc_start + alias_rnd;
alias_region_end = alias_region_start + alias_region_size;
heap_region_start = alloc_start + heap_rnd;
heap_region_end = heap_region_start + heap_region_size;
if (alias_rnd <= heap_rnd) {
heap_region_start += alias_region_size;
heap_region_end += alias_region_size;
} else {
alias_region_start += heap_region_size;
alias_region_end += heap_region_size;
}
// Setup stack region
if (stack_region_size) {
stack_region_start = alloc_start + stack_rnd;
stack_region_end = stack_region_start + stack_region_size;
if (alias_rnd < stack_rnd) {
stack_region_start += alias_region_size;
stack_region_end += alias_region_size;
} else {
alias_region_start += stack_region_size;
alias_region_end += stack_region_size;
}
if (heap_rnd < stack_rnd) {
stack_region_start += heap_region_size;
stack_region_end += heap_region_size;
} else {
heap_region_start += stack_region_size;
heap_region_end += stack_region_size;
}
}
// Setup kernel map region
if (kernel_map_region_size) {
kernel_map_region_start = alloc_start + kmap_rnd;
kernel_map_region_end = kernel_map_region_start + kernel_map_region_size;
if (alias_rnd < kmap_rnd) {
kernel_map_region_start += alias_region_size;
kernel_map_region_end += alias_region_size;
} else {
alias_region_start += kernel_map_region_size;
alias_region_end += kernel_map_region_size;
}
if (heap_rnd < kmap_rnd) {
kernel_map_region_start += heap_region_size;
kernel_map_region_end += heap_region_size;
} else {
heap_region_start += kernel_map_region_size;
heap_region_end += kernel_map_region_size;
}
if (stack_region_size) {
if (stack_rnd < kmap_rnd) {
kernel_map_region_start += stack_region_size;
kernel_map_region_end += stack_region_size;
} else {
stack_region_start += kernel_map_region_size;
stack_region_end += kernel_map_region_size;
}
}
}
// Set heap members
current_heap_end = heap_region_start;
max_heap_size = 0;
max_physical_memory_size = 0;
// Ensure that we regions inside our address space
auto IsInAddressSpace = [&](VAddr addr) {
return address_space_start <= addr && addr <= address_space_end;
};
ASSERT(IsInAddressSpace(alias_region_start));
ASSERT(IsInAddressSpace(alias_region_end));
ASSERT(IsInAddressSpace(heap_region_start));
ASSERT(IsInAddressSpace(heap_region_end));
ASSERT(IsInAddressSpace(stack_region_start));
ASSERT(IsInAddressSpace(stack_region_end));
ASSERT(IsInAddressSpace(kernel_map_region_start));
ASSERT(IsInAddressSpace(kernel_map_region_end));
// Ensure that we selected regions that don't overlap
const VAddr alias_start{alias_region_start};
const VAddr alias_last{alias_region_end - 1};
const VAddr heap_start{heap_region_start};
const VAddr heap_last{heap_region_end - 1};
const VAddr stack_start{stack_region_start};
const VAddr stack_last{stack_region_end - 1};
const VAddr kmap_start{kernel_map_region_start};
const VAddr kmap_last{kernel_map_region_end - 1};
ASSERT(alias_last < heap_start || heap_last < alias_start);
ASSERT(alias_last < stack_start || stack_last < alias_start);
ASSERT(alias_last < kmap_start || kmap_last < alias_start);
ASSERT(heap_last < stack_start || stack_last < heap_start);
ASSERT(heap_last < kmap_start || kmap_last < heap_start);
current_heap_end = heap_region_start;
max_heap_size = 0;
mapped_physical_memory_size = 0;
memory_pool = pool;
page_table_impl.Resize(address_space_width, PageBits);
return InitializeMemoryLayout(start, end);
}
ResultCode KPageTable::MapProcessCode(VAddr addr, std::size_t num_pages, KMemoryState state,
KMemoryPermission perm) {
std::lock_guard lock{page_table_lock};
const u64 size{num_pages * PageSize};
if (!CanContain(addr, size, state)) {
return ResultInvalidCurrentMemory;
}
if (IsRegionMapped(addr, size)) {
return ResultInvalidCurrentMemory;
}
KPageLinkedList page_linked_list;
CASCADE_CODE(system.Kernel().MemoryManager().Allocate(page_linked_list, num_pages, memory_pool,
allocation_option));
CASCADE_CODE(Operate(addr, num_pages, page_linked_list, OperationType::MapGroup));
block_manager->Update(addr, num_pages, state, perm);
return ResultSuccess;
}
ResultCode KPageTable::MapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
const std::size_t num_pages{size / PageSize};
KMemoryState state{};
KMemoryPermission perm{};
CASCADE_CODE(CheckMemoryState(&state, &perm, nullptr, nullptr, src_addr, size,
KMemoryState::All, KMemoryState::Normal, KMemoryPermission::All,
KMemoryPermission::UserReadWrite, KMemoryAttribute::Mask,
KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped));
if (IsRegionMapped(dst_addr, size)) {
return ResultInvalidCurrentMemory;
}
KPageLinkedList page_linked_list;
AddRegionToPages(src_addr, num_pages, page_linked_list);
{
auto block_guard = detail::ScopeExit(
[&] { Operate(src_addr, num_pages, perm, OperationType::ChangePermissions); });
CASCADE_CODE(Operate(src_addr, num_pages, KMemoryPermission::None,
OperationType::ChangePermissions));
CASCADE_CODE(MapPages(dst_addr, page_linked_list, KMemoryPermission::None));
block_guard.Cancel();
}
block_manager->Update(src_addr, num_pages, state, KMemoryPermission::None,
KMemoryAttribute::Locked);
block_manager->Update(dst_addr, num_pages, KMemoryState::AliasCode);
return ResultSuccess;
}
ResultCode KPageTable::UnmapCodeMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
if (!size) {
return ResultSuccess;
}
const std::size_t num_pages{size / PageSize};
CASCADE_CODE(CheckMemoryState(nullptr, nullptr, nullptr, nullptr, src_addr, size,
KMemoryState::All, KMemoryState::Normal, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::Locked, KMemoryAttribute::IpcAndDeviceMapped));
KMemoryState state{};
CASCADE_CODE(CheckMemoryState(
&state, nullptr, nullptr, nullptr, dst_addr, PageSize, KMemoryState::FlagCanCodeAlias,
KMemoryState::FlagCanCodeAlias, KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::Mask, KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped));
CASCADE_CODE(CheckMemoryState(dst_addr, size, KMemoryState::All, state, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::None));
CASCADE_CODE(Operate(dst_addr, num_pages, KMemoryPermission::None, OperationType::Unmap));
block_manager->Update(dst_addr, num_pages, KMemoryState::Free);
block_manager->Update(src_addr, num_pages, KMemoryState::Normal,
KMemoryPermission::UserReadWrite);
system.InvalidateCpuInstructionCacheRange(dst_addr, size);
return ResultSuccess;
}
ResultCode KPageTable::UnmapProcessMemory(VAddr dst_addr, std::size_t size,
KPageTable& src_page_table, VAddr src_addr) {
std::lock_guard lock{page_table_lock};
const std::size_t num_pages{size / PageSize};
// Check that the memory is mapped in the destination process.
size_t num_allocator_blocks;
R_TRY(CheckMemoryState(&num_allocator_blocks, dst_addr, size, KMemoryState::All,
KMemoryState::SharedCode, KMemoryPermission::UserReadWrite,
KMemoryPermission::UserReadWrite, KMemoryAttribute::All,
KMemoryAttribute::None));
// Check that the memory is mapped in the source process.
R_TRY(src_page_table.CheckMemoryState(src_addr, size, KMemoryState::FlagCanMapProcess,
KMemoryState::FlagCanMapProcess, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::All,
KMemoryAttribute::None));
CASCADE_CODE(Operate(dst_addr, num_pages, KMemoryPermission::None, OperationType::Unmap));
// Apply the memory block update.
block_manager->Update(dst_addr, num_pages, KMemoryState::Free, KMemoryPermission::None,
KMemoryAttribute::None);
return ResultSuccess;
}
void KPageTable::MapPhysicalMemory(KPageLinkedList& page_linked_list, VAddr start, VAddr end) {
auto node{page_linked_list.Nodes().begin()};
PAddr map_addr{node->GetAddress()};
std::size_t src_num_pages{node->GetNumPages()};
block_manager->IterateForRange(start, end, [&](const KMemoryInfo& info) {
if (info.state != KMemoryState::Free) {
return;
}
std::size_t dst_num_pages{GetSizeInRange(info, start, end) / PageSize};
VAddr dst_addr{GetAddressInRange(info, start)};
while (dst_num_pages) {
if (!src_num_pages) {
node = std::next(node);
map_addr = node->GetAddress();
src_num_pages = node->GetNumPages();
}
const std::size_t num_pages{std::min(src_num_pages, dst_num_pages)};
Operate(dst_addr, num_pages, KMemoryPermission::UserReadWrite, OperationType::Map,
map_addr);
dst_addr += num_pages * PageSize;
map_addr += num_pages * PageSize;
src_num_pages -= num_pages;
dst_num_pages -= num_pages;
}
});
}
ResultCode KPageTable::MapPhysicalMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
std::size_t mapped_size{};
const VAddr end_addr{addr + size};
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state != KMemoryState::Free) {
mapped_size += GetSizeInRange(info, addr, end_addr);
}
});
if (mapped_size == size) {
return ResultSuccess;
}
const std::size_t remaining_size{size - mapped_size};
const std::size_t remaining_pages{remaining_size / PageSize};
// Reserve the memory from the process resource limit.
KScopedResourceReservation memory_reservation(
system.Kernel().CurrentProcess()->GetResourceLimit(), LimitableResource::PhysicalMemory,
remaining_size);
if (!memory_reservation.Succeeded()) {
LOG_ERROR(Kernel, "Could not reserve remaining {:X} bytes", remaining_size);
return ResultLimitReached;
}
KPageLinkedList page_linked_list;
CASCADE_CODE(system.Kernel().MemoryManager().Allocate(page_linked_list, remaining_pages,
memory_pool, allocation_option));
// We succeeded, so commit the memory reservation.
memory_reservation.Commit();
MapPhysicalMemory(page_linked_list, addr, end_addr);
mapped_physical_memory_size += remaining_size;
const std::size_t num_pages{size / PageSize};
block_manager->Update(addr, num_pages, KMemoryState::Free, KMemoryPermission::None,
KMemoryAttribute::None, KMemoryState::Normal,
KMemoryPermission::UserReadWrite, KMemoryAttribute::None);
return ResultSuccess;
}
ResultCode KPageTable::UnmapPhysicalMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
const VAddr end_addr{addr + size};
ResultCode result{ResultSuccess};
std::size_t mapped_size{};
// Verify that the region can be unmapped
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state == KMemoryState::Normal) {
if (info.attribute != KMemoryAttribute::None) {
result = ResultInvalidCurrentMemory;
return;
}
mapped_size += GetSizeInRange(info, addr, end_addr);
} else if (info.state != KMemoryState::Free) {
result = ResultInvalidCurrentMemory;
}
});
if (result.IsError()) {
return result;
}
if (!mapped_size) {
return ResultSuccess;
}
CASCADE_CODE(UnmapMemory(addr, size));
auto process{system.Kernel().CurrentProcess()};
process->GetResourceLimit()->Release(LimitableResource::PhysicalMemory, mapped_size);
mapped_physical_memory_size -= mapped_size;
return ResultSuccess;
}
ResultCode KPageTable::UnmapMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
const VAddr end_addr{addr + size};
ResultCode result{ResultSuccess};
KPageLinkedList page_linked_list;
// Unmap each region within the range
block_manager->IterateForRange(addr, end_addr, [&](const KMemoryInfo& info) {
if (info.state == KMemoryState::Normal) {
const std::size_t block_size{GetSizeInRange(info, addr, end_addr)};
const std::size_t block_num_pages{block_size / PageSize};
const VAddr block_addr{GetAddressInRange(info, addr)};
AddRegionToPages(block_addr, block_size / PageSize, page_linked_list);
if (result = Operate(block_addr, block_num_pages, KMemoryPermission::None,
OperationType::Unmap);
result.IsError()) {
return;
}
}
});
if (result.IsError()) {
return result;
}
const std::size_t num_pages{size / PageSize};
system.Kernel().MemoryManager().Free(page_linked_list, num_pages, memory_pool,
allocation_option);
block_manager->Update(addr, num_pages, KMemoryState::Free);
return ResultSuccess;
}
ResultCode KPageTable::MapMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryState src_state{};
CASCADE_CODE(CheckMemoryState(
&src_state, nullptr, nullptr, nullptr, src_addr, size, KMemoryState::FlagCanAlias,
KMemoryState::FlagCanAlias, KMemoryPermission::All, KMemoryPermission::UserReadWrite,
KMemoryAttribute::Mask, KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped));
if (IsRegionMapped(dst_addr, size)) {
return ResultInvalidCurrentMemory;
}
KPageLinkedList page_linked_list;
const std::size_t num_pages{size / PageSize};
AddRegionToPages(src_addr, num_pages, page_linked_list);
{
auto block_guard = detail::ScopeExit([&] {
Operate(src_addr, num_pages, KMemoryPermission::UserReadWrite,
OperationType::ChangePermissions);
});
CASCADE_CODE(Operate(src_addr, num_pages, KMemoryPermission::None,
OperationType::ChangePermissions));
CASCADE_CODE(MapPages(dst_addr, page_linked_list, KMemoryPermission::UserReadWrite));
block_guard.Cancel();
}
block_manager->Update(src_addr, num_pages, src_state, KMemoryPermission::None,
KMemoryAttribute::Locked);
block_manager->Update(dst_addr, num_pages, KMemoryState::Stack,
KMemoryPermission::UserReadWrite);
return ResultSuccess;
}
ResultCode KPageTable::UnmapMemory(VAddr dst_addr, VAddr src_addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryState src_state{};
CASCADE_CODE(CheckMemoryState(
&src_state, nullptr, nullptr, nullptr, src_addr, size, KMemoryState::FlagCanAlias,
KMemoryState::FlagCanAlias, KMemoryPermission::All, KMemoryPermission::None,
KMemoryAttribute::Mask, KMemoryAttribute::Locked, KMemoryAttribute::IpcAndDeviceMapped));
KMemoryPermission dst_perm{};
CASCADE_CODE(CheckMemoryState(nullptr, &dst_perm, nullptr, nullptr, dst_addr, size,
KMemoryState::All, KMemoryState::Stack, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped));
KPageLinkedList src_pages;
KPageLinkedList dst_pages;
const std::size_t num_pages{size / PageSize};
AddRegionToPages(src_addr, num_pages, src_pages);
AddRegionToPages(dst_addr, num_pages, dst_pages);
if (!dst_pages.IsEqual(src_pages)) {
return ResultInvalidMemoryRegion;
}
{
auto block_guard = detail::ScopeExit([&] { MapPages(dst_addr, dst_pages, dst_perm); });
CASCADE_CODE(Operate(dst_addr, num_pages, KMemoryPermission::None, OperationType::Unmap));
CASCADE_CODE(Operate(src_addr, num_pages, KMemoryPermission::UserReadWrite,
OperationType::ChangePermissions));
block_guard.Cancel();
}
block_manager->Update(src_addr, num_pages, src_state, KMemoryPermission::UserReadWrite);
block_manager->Update(dst_addr, num_pages, KMemoryState::Free);
return ResultSuccess;
}
ResultCode KPageTable::MapPages(VAddr addr, const KPageLinkedList& page_linked_list,
KMemoryPermission perm) {
VAddr cur_addr{addr};
for (const auto& node : page_linked_list.Nodes()) {
if (const auto result{
Operate(cur_addr, node.GetNumPages(), perm, OperationType::Map, node.GetAddress())};
result.IsError()) {
const std::size_t num_pages{(addr - cur_addr) / PageSize};
ASSERT(Operate(addr, num_pages, KMemoryPermission::None, OperationType::Unmap)
.IsSuccess());
return result;
}
cur_addr += node.GetNumPages() * PageSize;
}
return ResultSuccess;
}
ResultCode KPageTable::MapPages(VAddr addr, KPageLinkedList& page_linked_list, KMemoryState state,
KMemoryPermission perm) {
std::lock_guard lock{page_table_lock};
const std::size_t num_pages{page_linked_list.GetNumPages()};
const std::size_t size{num_pages * PageSize};
if (!CanContain(addr, size, state)) {
return ResultInvalidCurrentMemory;
}
if (IsRegionMapped(addr, num_pages * PageSize)) {
return ResultInvalidCurrentMemory;
}
CASCADE_CODE(MapPages(addr, page_linked_list, perm));
block_manager->Update(addr, num_pages, state, perm);
return ResultSuccess;
}
ResultCode KPageTable::UnmapPages(VAddr addr, const KPageLinkedList& page_linked_list) {
VAddr cur_addr{addr};
for (const auto& node : page_linked_list.Nodes()) {
const std::size_t num_pages{(addr - cur_addr) / PageSize};
if (const auto result{
Operate(addr, num_pages, KMemoryPermission::None, OperationType::Unmap)};
result.IsError()) {
return result;
}
cur_addr += node.GetNumPages() * PageSize;
}
return ResultSuccess;
}
ResultCode KPageTable::UnmapPages(VAddr addr, KPageLinkedList& page_linked_list,
KMemoryState state) {
std::lock_guard lock{page_table_lock};
const std::size_t num_pages{page_linked_list.GetNumPages()};
const std::size_t size{num_pages * PageSize};
if (!CanContain(addr, size, state)) {
return ResultInvalidCurrentMemory;
}
if (IsRegionMapped(addr, num_pages * PageSize)) {
return ResultInvalidCurrentMemory;
}
CASCADE_CODE(UnmapPages(addr, page_linked_list));
block_manager->Update(addr, num_pages, state, KMemoryPermission::None);
return ResultSuccess;
}
ResultCode KPageTable::SetProcessMemoryPermission(VAddr addr, std::size_t size,
Svc::MemoryPermission svc_perm) {
const size_t num_pages = size / PageSize;
// Lock the table.
std::lock_guard lock{page_table_lock};
// Verify we can change the memory permission.
KMemoryState old_state;
KMemoryPermission old_perm;
size_t num_allocator_blocks;
R_TRY(this->CheckMemoryState(std::addressof(old_state), std::addressof(old_perm), nullptr,
std::addressof(num_allocator_blocks), addr, size,
KMemoryState::FlagCode, KMemoryState::FlagCode,
KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::All, KMemoryAttribute::None));
// Determine new perm/state.
const KMemoryPermission new_perm = ConvertToKMemoryPermission(svc_perm);
KMemoryState new_state = old_state;
const bool is_w = (new_perm & KMemoryPermission::UserWrite) == KMemoryPermission::UserWrite;
const bool is_x = (new_perm & KMemoryPermission::UserExecute) == KMemoryPermission::UserExecute;
const bool was_x =
(old_perm & KMemoryPermission::UserExecute) == KMemoryPermission::UserExecute;
ASSERT(!(is_w && is_x));
if (is_w) {
switch (old_state) {
case KMemoryState::Code:
new_state = KMemoryState::CodeData;
break;
case KMemoryState::AliasCode:
new_state = KMemoryState::AliasCodeData;
break;
default:
UNREACHABLE();
}
}
// Succeed if there's nothing to do.
R_SUCCEED_IF(old_perm == new_perm && old_state == new_state);
// Perform mapping operation.
const auto operation =
was_x ? OperationType::ChangePermissionsAndRefresh : OperationType::ChangePermissions;
R_TRY(Operate(addr, num_pages, new_perm, operation));
// Update the blocks.
block_manager->Update(addr, num_pages, new_state, new_perm, KMemoryAttribute::None);
// Ensure cache coherency, if we're setting pages as executable.
if (is_x) {
// Memory execution state is changing, invalidate CPU cache range
system.InvalidateCpuInstructionCacheRange(addr, size);
}
return ResultSuccess;
}
KMemoryInfo KPageTable::QueryInfoImpl(VAddr addr) {
std::lock_guard lock{page_table_lock};
return block_manager->FindBlock(addr).GetMemoryInfo();
}
KMemoryInfo KPageTable::QueryInfo(VAddr addr) {
if (!Contains(addr, 1)) {
return {address_space_end, 0 - address_space_end, KMemoryState::Inaccessible,
KMemoryPermission::None, KMemoryAttribute::None, KMemoryPermission::None};
}
return QueryInfoImpl(addr);
}
ResultCode KPageTable::ReserveTransferMemory(VAddr addr, std::size_t size, KMemoryPermission perm) {
std::lock_guard lock{page_table_lock};
KMemoryState state{};
KMemoryAttribute attribute{};
CASCADE_CODE(CheckMemoryState(
&state, nullptr, &attribute, nullptr, addr, size,
KMemoryState::FlagCanTransfer | KMemoryState::FlagReferenceCounted,
KMemoryState::FlagCanTransfer | KMemoryState::FlagReferenceCounted, KMemoryPermission::All,
KMemoryPermission::UserReadWrite, KMemoryAttribute::Mask, KMemoryAttribute::None,
KMemoryAttribute::IpcAndDeviceMapped));
block_manager->Update(addr, size / PageSize, state, perm, attribute | KMemoryAttribute::Locked);
return ResultSuccess;
}
ResultCode KPageTable::ResetTransferMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryState state{};
CASCADE_CODE(
CheckMemoryState(&state, nullptr, nullptr, nullptr, addr, size,
KMemoryState::FlagCanTransfer | KMemoryState::FlagReferenceCounted,
KMemoryState::FlagCanTransfer | KMemoryState::FlagReferenceCounted,
KMemoryPermission::None, KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::Locked, KMemoryAttribute::IpcAndDeviceMapped));
block_manager->Update(addr, size / PageSize, state, KMemoryPermission::UserReadWrite);
return ResultSuccess;
}
ResultCode KPageTable::SetMemoryPermission(VAddr addr, std::size_t size,
Svc::MemoryPermission svc_perm) {
const size_t num_pages = size / PageSize;
// Lock the table.
std::lock_guard lock{page_table_lock};
// Verify we can change the memory permission.
KMemoryState old_state;
KMemoryPermission old_perm;
R_TRY(this->CheckMemoryState(
std::addressof(old_state), std::addressof(old_perm), nullptr, nullptr, addr, size,
KMemoryState::FlagCanReprotect, KMemoryState::FlagCanReprotect, KMemoryPermission::None,
KMemoryPermission::None, KMemoryAttribute::All, KMemoryAttribute::None));
// Determine new perm.
const KMemoryPermission new_perm = ConvertToKMemoryPermission(svc_perm);
R_SUCCEED_IF(old_perm == new_perm);
// Perform mapping operation.
R_TRY(Operate(addr, num_pages, new_perm, OperationType::ChangePermissions));
// Update the blocks.
block_manager->Update(addr, num_pages, old_state, new_perm, KMemoryAttribute::None);
return ResultSuccess;
}
ResultCode KPageTable::SetMemoryAttribute(VAddr addr, std::size_t size, u32 mask, u32 attr) {
const size_t num_pages = size / PageSize;
ASSERT((static_cast<KMemoryAttribute>(mask) | KMemoryAttribute::SetMask) ==
KMemoryAttribute::SetMask);
// Lock the table.
std::lock_guard lock{page_table_lock};
// Verify we can change the memory attribute.
KMemoryState old_state;
KMemoryPermission old_perm;
KMemoryAttribute old_attr;
size_t num_allocator_blocks;
constexpr auto AttributeTestMask =
~(KMemoryAttribute::SetMask | KMemoryAttribute::DeviceShared);
R_TRY(this->CheckMemoryState(
std::addressof(old_state), std::addressof(old_perm), std::addressof(old_attr),
std::addressof(num_allocator_blocks), addr, size, KMemoryState::FlagCanChangeAttribute,
KMemoryState::FlagCanChangeAttribute, KMemoryPermission::None, KMemoryPermission::None,
AttributeTestMask, KMemoryAttribute::None, ~AttributeTestMask));
// Determine the new attribute.
const auto new_attr = ((old_attr & static_cast<KMemoryAttribute>(~mask)) |
static_cast<KMemoryAttribute>(attr & mask));
// Perform operation.
this->Operate(addr, num_pages, old_perm, OperationType::ChangePermissionsAndRefresh);
// Update the blocks.
block_manager->Update(addr, num_pages, old_state, old_perm, new_attr);
return ResultSuccess;
}
ResultCode KPageTable::SetMaxHeapSize(std::size_t size) {
// Lock the table.
std::lock_guard lock{page_table_lock};
// Only process page tables are allowed to set heap size.
ASSERT(!this->IsKernel());
max_heap_size = size;
return ResultSuccess;
}
ResultCode KPageTable::SetHeapSize(VAddr* out, std::size_t size) {
// Try to perform a reduction in heap, instead of an extension.
VAddr cur_address{};
std::size_t allocation_size{};
{
// Lock the table.
std::lock_guard lk(page_table_lock);
// Validate that setting heap size is possible at all.
R_UNLESS(!is_kernel, ResultOutOfMemory);
R_UNLESS(size <= static_cast<std::size_t>(heap_region_end - heap_region_start),
ResultOutOfMemory);
R_UNLESS(size <= max_heap_size, ResultOutOfMemory);
if (size < GetHeapSize()) {
// The size being requested is less than the current size, so we need to free the end of
// the heap.
// Validate memory state.
std::size_t num_allocator_blocks;
R_TRY(this->CheckMemoryState(std::addressof(num_allocator_blocks),
heap_region_start + size, GetHeapSize() - size,
KMemoryState::All, KMemoryState::Normal,
KMemoryPermission::All, KMemoryPermission::UserReadWrite,
KMemoryAttribute::All, KMemoryAttribute::None));
// Unmap the end of the heap.
const auto num_pages = (GetHeapSize() - size) / PageSize;
R_TRY(Operate(heap_region_start + size, num_pages, KMemoryPermission::None,
OperationType::Unmap));
// Release the memory from the resource limit.
system.Kernel().CurrentProcess()->GetResourceLimit()->Release(
LimitableResource::PhysicalMemory, num_pages * PageSize);
// Apply the memory block update.
block_manager->Update(heap_region_start + size, num_pages, KMemoryState::Free,
KMemoryPermission::None, KMemoryAttribute::None);
// Update the current heap end.
current_heap_end = heap_region_start + size;
// Set the output.
*out = heap_region_start;
return ResultSuccess;
} else if (size == GetHeapSize()) {
// The size requested is exactly the current size.
*out = heap_region_start;
return ResultSuccess;
} else {
// We have to allocate memory. Determine how much to allocate and where while the table
// is locked.
cur_address = current_heap_end;
allocation_size = size - GetHeapSize();
}
}
// Reserve memory for the heap extension.
KScopedResourceReservation memory_reservation(
system.Kernel().CurrentProcess()->GetResourceLimit(), LimitableResource::PhysicalMemory,
allocation_size);
R_UNLESS(memory_reservation.Succeeded(), ResultLimitReached);
// Allocate pages for the heap extension.
KPageLinkedList page_linked_list;
R_TRY(system.Kernel().MemoryManager().Allocate(page_linked_list, allocation_size / PageSize,
memory_pool, allocation_option));
// Map the pages.
{
// Lock the table.
std::lock_guard lk(page_table_lock);
// Ensure that the heap hasn't changed since we began executing.
ASSERT(cur_address == current_heap_end);
// Check the memory state.
std::size_t num_allocator_blocks{};
R_TRY(this->CheckMemoryState(std::addressof(num_allocator_blocks), current_heap_end,
allocation_size, KMemoryState::All, KMemoryState::Free,
KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::None, KMemoryAttribute::None));
// Map the pages.
const auto num_pages = allocation_size / PageSize;
R_TRY(Operate(current_heap_end, num_pages, page_linked_list, OperationType::MapGroup));
// Clear all the newly allocated pages.
for (std::size_t cur_page = 0; cur_page < num_pages; ++cur_page) {
std::memset(system.Memory().GetPointer(current_heap_end + (cur_page * PageSize)), 0,
PageSize);
}
// We succeeded, so commit our memory reservation.
memory_reservation.Commit();
// Apply the memory block update.
block_manager->Update(current_heap_end, num_pages, KMemoryState::Normal,
KMemoryPermission::UserReadWrite, KMemoryAttribute::None);
// Update the current heap end.
current_heap_end = heap_region_start + size;
// Set the output.
*out = heap_region_start;
return ResultSuccess;
}
}
ResultVal<VAddr> KPageTable::AllocateAndMapMemory(std::size_t needed_num_pages, std::size_t align,
bool is_map_only, VAddr region_start,
std::size_t region_num_pages, KMemoryState state,
KMemoryPermission perm, PAddr map_addr) {
std::lock_guard lock{page_table_lock};
if (!CanContain(region_start, region_num_pages * PageSize, state)) {
return ResultInvalidCurrentMemory;
}
if (region_num_pages <= needed_num_pages) {
return ResultOutOfMemory;
}
const VAddr addr{
AllocateVirtualMemory(region_start, region_num_pages, needed_num_pages, align)};
if (!addr) {
return ResultOutOfMemory;
}
if (is_map_only) {
CASCADE_CODE(Operate(addr, needed_num_pages, perm, OperationType::Map, map_addr));
} else {
KPageLinkedList page_group;
CASCADE_CODE(system.Kernel().MemoryManager().Allocate(page_group, needed_num_pages,
memory_pool, allocation_option));
CASCADE_CODE(Operate(addr, needed_num_pages, page_group, OperationType::MapGroup));
}
block_manager->Update(addr, needed_num_pages, state, perm);
return addr;
}
ResultCode KPageTable::LockForDeviceAddressSpace(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryPermission perm{};
if (const ResultCode result{CheckMemoryState(
nullptr, &perm, nullptr, nullptr, addr, size, KMemoryState::FlagCanChangeAttribute,
KMemoryState::FlagCanChangeAttribute, KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::LockedAndIpcLocked, KMemoryAttribute::None,
KMemoryAttribute::DeviceSharedAndUncached)};
result.IsError()) {
return result;
}
block_manager->UpdateLock(
addr, size / PageSize,
[](KMemoryBlockManager::iterator block, KMemoryPermission permission) {
block->ShareToDevice(permission);
},
perm);
return ResultSuccess;
}
ResultCode KPageTable::UnlockForDeviceAddressSpace(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryPermission perm{};
if (const ResultCode result{CheckMemoryState(
nullptr, &perm, nullptr, nullptr, addr, size, KMemoryState::FlagCanChangeAttribute,
KMemoryState::FlagCanChangeAttribute, KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::LockedAndIpcLocked, KMemoryAttribute::None,
KMemoryAttribute::DeviceSharedAndUncached)};
result.IsError()) {
return result;
}
block_manager->UpdateLock(
addr, size / PageSize,
[](KMemoryBlockManager::iterator block, KMemoryPermission permission) {
block->UnshareToDevice(permission);
},
perm);
return ResultSuccess;
}
ResultCode KPageTable::LockForCodeMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryPermission new_perm = KMemoryPermission::NotMapped | KMemoryPermission::KernelReadWrite;
KMemoryPermission old_perm{};
if (const ResultCode result{CheckMemoryState(
nullptr, &old_perm, nullptr, nullptr, addr, size, KMemoryState::FlagCanCodeMemory,
KMemoryState::FlagCanCodeMemory, KMemoryPermission::All,
KMemoryPermission::UserReadWrite, KMemoryAttribute::All, KMemoryAttribute::None)};
result.IsError()) {
return result;
}
new_perm = (new_perm != KMemoryPermission::None) ? new_perm : old_perm;
block_manager->UpdateLock(
addr, size / PageSize,
[](KMemoryBlockManager::iterator block, KMemoryPermission permission) {
block->ShareToDevice(permission);
},
new_perm);
return ResultSuccess;
}
ResultCode KPageTable::UnlockForCodeMemory(VAddr addr, std::size_t size) {
std::lock_guard lock{page_table_lock};
KMemoryPermission new_perm = KMemoryPermission::UserReadWrite;
KMemoryPermission old_perm{};
if (const ResultCode result{CheckMemoryState(
nullptr, &old_perm, nullptr, nullptr, addr, size, KMemoryState::FlagCanCodeMemory,
KMemoryState::FlagCanCodeMemory, KMemoryPermission::None, KMemoryPermission::None,
KMemoryAttribute::All, KMemoryAttribute::Locked)};
result.IsError()) {
return result;
}
new_perm = (new_perm != KMemoryPermission::None) ? new_perm : old_perm;
block_manager->UpdateLock(
addr, size / PageSize,
[](KMemoryBlockManager::iterator block, KMemoryPermission permission) {
block->UnshareToDevice(permission);
},
new_perm);
return ResultSuccess;
}
ResultCode KPageTable::InitializeMemoryLayout(VAddr start, VAddr end) {
block_manager = std::make_unique<KMemoryBlockManager>(start, end);
return ResultSuccess;
}
bool KPageTable::IsRegionMapped(VAddr address, u64 size) {
return CheckMemoryState(address, size, KMemoryState::All, KMemoryState::Free,
KMemoryPermission::All, KMemoryPermission::None, KMemoryAttribute::Mask,
KMemoryAttribute::None, KMemoryAttribute::IpcAndDeviceMapped)
.IsError();
}
bool KPageTable::IsRegionContiguous(VAddr addr, u64 size) const {
auto start_ptr = system.Memory().GetPointer(addr);
for (u64 offset{}; offset < size; offset += PageSize) {
if (start_ptr != system.Memory().GetPointer(addr + offset)) {
return false;
}
start_ptr += PageSize;
}
return true;
}
void KPageTable::AddRegionToPages(VAddr start, std::size_t num_pages,
KPageLinkedList& page_linked_list) {
VAddr addr{start};
while (addr < start + (num_pages * PageSize)) {
const PAddr paddr{GetPhysicalAddr(addr)};
if (!paddr) {
UNREACHABLE();
}
page_linked_list.AddBlock(paddr, 1);
addr += PageSize;
}
}
VAddr KPageTable::AllocateVirtualMemory(VAddr start, std::size_t region_num_pages,
u64 needed_num_pages, std::size_t align) {
if (is_aslr_enabled) {
UNIMPLEMENTED();
}
return block_manager->FindFreeArea(start, region_num_pages, needed_num_pages, align, 0,
IsKernel() ? 1 : 4);
}
ResultCode KPageTable::Operate(VAddr addr, std::size_t num_pages, const KPageLinkedList& page_group,
OperationType operation) {
std::lock_guard lock{page_table_lock};
ASSERT(Common::IsAligned(addr, PageSize));
ASSERT(num_pages > 0);
ASSERT(num_pages == page_group.GetNumPages());
for (const auto& node : page_group.Nodes()) {
const std::size_t size{node.GetNumPages() * PageSize};
switch (operation) {
case OperationType::MapGroup:
system.Memory().MapMemoryRegion(page_table_impl, addr, size, node.GetAddress());
break;
default:
UNREACHABLE();
}
addr += size;
}
return ResultSuccess;
}
ResultCode KPageTable::Operate(VAddr addr, std::size_t num_pages, KMemoryPermission perm,
OperationType operation, PAddr map_addr) {
std::lock_guard lock{page_table_lock};
ASSERT(num_pages > 0);
ASSERT(Common::IsAligned(addr, PageSize));
ASSERT(ContainsPages(addr, num_pages));
switch (operation) {
case OperationType::Unmap:
system.Memory().UnmapRegion(page_table_impl, addr, num_pages * PageSize);
break;
case OperationType::Map: {
ASSERT(map_addr);
ASSERT(Common::IsAligned(map_addr, PageSize));
system.Memory().MapMemoryRegion(page_table_impl, addr, num_pages * PageSize, map_addr);
break;
}
case OperationType::ChangePermissions:
case OperationType::ChangePermissionsAndRefresh:
break;
default:
UNREACHABLE();
}
return ResultSuccess;
}
constexpr VAddr KPageTable::GetRegionAddress(KMemoryState state) const {
switch (state) {
case KMemoryState::Free:
case KMemoryState::Kernel:
return address_space_start;
case KMemoryState::Normal:
return heap_region_start;
case KMemoryState::Ipc:
case KMemoryState::NonSecureIpc:
case KMemoryState::NonDeviceIpc:
return alias_region_start;
case KMemoryState::Stack:
return stack_region_start;
case KMemoryState::Static:
case KMemoryState::ThreadLocal:
return kernel_map_region_start;
case KMemoryState::Io:
case KMemoryState::Shared:
case KMemoryState::AliasCode:
case KMemoryState::AliasCodeData:
case KMemoryState::Transfered:
case KMemoryState::SharedTransfered:
case KMemoryState::SharedCode:
case KMemoryState::GeneratedCode:
case KMemoryState::CodeOut:
case KMemoryState::Coverage:
return alias_code_region_start;
case KMemoryState::Code:
case KMemoryState::CodeData:
return code_region_start;
default:
UNREACHABLE();
return {};
}
}
constexpr std::size_t KPageTable::GetRegionSize(KMemoryState state) const {
switch (state) {
case KMemoryState::Free:
case KMemoryState::Kernel:
return address_space_end - address_space_start;
case KMemoryState::Normal:
return heap_region_end - heap_region_start;
case KMemoryState::Ipc:
case KMemoryState::NonSecureIpc:
case KMemoryState::NonDeviceIpc:
return alias_region_end - alias_region_start;
case KMemoryState::Stack:
return stack_region_end - stack_region_start;
case KMemoryState::Static:
case KMemoryState::ThreadLocal:
return kernel_map_region_end - kernel_map_region_start;
case KMemoryState::Io:
case KMemoryState::Shared:
case KMemoryState::AliasCode:
case KMemoryState::AliasCodeData:
case KMemoryState::Transfered:
case KMemoryState::SharedTransfered:
case KMemoryState::SharedCode:
case KMemoryState::GeneratedCode:
case KMemoryState::CodeOut:
case KMemoryState::Coverage:
return alias_code_region_end - alias_code_region_start;
case KMemoryState::Code:
case KMemoryState::CodeData:
return code_region_end - code_region_start;
default:
UNREACHABLE();
return {};
}
}
bool KPageTable::CanContain(VAddr addr, std::size_t size, KMemoryState state) const {
const VAddr end = addr + size;
const VAddr last = end - 1;
const VAddr region_start = this->GetRegionAddress(state);
const size_t region_size = this->GetRegionSize(state);
const bool is_in_region =
region_start <= addr && addr < end && last <= region_start + region_size - 1;
const bool is_in_heap = !(end <= heap_region_start || heap_region_end <= addr ||
heap_region_start == heap_region_end);
const bool is_in_alias = !(end <= alias_region_start || alias_region_end <= addr ||
alias_region_start == alias_region_end);
switch (state) {
case KMemoryState::Free:
case KMemoryState::Kernel:
return is_in_region;
case KMemoryState::Io:
case KMemoryState::Static:
case KMemoryState::Code:
case KMemoryState::CodeData:
case KMemoryState::Shared:
case KMemoryState::AliasCode:
case KMemoryState::AliasCodeData:
case KMemoryState::Stack:
case KMemoryState::ThreadLocal:
case KMemoryState::Transfered:
case KMemoryState::SharedTransfered:
case KMemoryState::SharedCode:
case KMemoryState::GeneratedCode:
case KMemoryState::CodeOut:
case KMemoryState::Coverage:
return is_in_region && !is_in_heap && !is_in_alias;
case KMemoryState::Normal:
ASSERT(is_in_heap);
return is_in_region && !is_in_alias;
case KMemoryState::Ipc:
case KMemoryState::NonSecureIpc:
case KMemoryState::NonDeviceIpc:
ASSERT(is_in_alias);
return is_in_region && !is_in_heap;
default:
return false;
}
}
ResultCode KPageTable::CheckMemoryState(const KMemoryInfo& info, KMemoryState state_mask,
KMemoryState state, KMemoryPermission perm_mask,
KMemoryPermission perm, KMemoryAttribute attr_mask,
KMemoryAttribute attr) const {
// Validate the states match expectation.
R_UNLESS((info.state & state_mask) == state, ResultInvalidCurrentMemory);
R_UNLESS((info.perm & perm_mask) == perm, ResultInvalidCurrentMemory);
R_UNLESS((info.attribute & attr_mask) == attr, ResultInvalidCurrentMemory);
return ResultSuccess;
}
ResultCode KPageTable::CheckMemoryStateContiguous(std::size_t* out_blocks_needed, VAddr addr,
std::size_t size, KMemoryState state_mask,
KMemoryState state, KMemoryPermission perm_mask,
KMemoryPermission perm,
KMemoryAttribute attr_mask,
KMemoryAttribute attr) const {
ASSERT(this->IsLockedByCurrentThread());
// Get information about the first block.
const VAddr last_addr = addr + size - 1;
KMemoryBlockManager::const_iterator it = block_manager->FindIterator(addr);
KMemoryInfo info = it->GetMemoryInfo();
// If the start address isn't aligned, we need a block.
const size_t blocks_for_start_align =
(Common::AlignDown(addr, PageSize) != info.GetAddress()) ? 1 : 0;
while (true) {
// Validate against the provided masks.
R_TRY(this->CheckMemoryState(info, state_mask, state, perm_mask, perm, attr_mask, attr));
// Break once we're done.
if (last_addr <= info.GetLastAddress()) {
break;
}
// Advance our iterator.
it++;
ASSERT(it != block_manager->cend());
info = it->GetMemoryInfo();
}
// If the end address isn't aligned, we need a block.
const size_t blocks_for_end_align =
(Common::AlignUp(addr + size, PageSize) != info.GetEndAddress()) ? 1 : 0;
if (out_blocks_needed != nullptr) {
*out_blocks_needed = blocks_for_start_align + blocks_for_end_align;
}
return ResultSuccess;
}
ResultCode KPageTable::CheckMemoryState(KMemoryState* out_state, KMemoryPermission* out_perm,
KMemoryAttribute* out_attr, std::size_t* out_blocks_needed,
VAddr addr, std::size_t size, KMemoryState state_mask,
KMemoryState state, KMemoryPermission perm_mask,
KMemoryPermission perm, KMemoryAttribute attr_mask,
KMemoryAttribute attr, KMemoryAttribute ignore_attr) const {
ASSERT(this->IsLockedByCurrentThread());
// Get information about the first block.
const VAddr last_addr = addr + size - 1;
KMemoryBlockManager::const_iterator it = block_manager->FindIterator(addr);
KMemoryInfo info = it->GetMemoryInfo();
// If the start address isn't aligned, we need a block.
const size_t blocks_for_start_align =
(Common::AlignDown(addr, PageSize) != info.GetAddress()) ? 1 : 0;
// Validate all blocks in the range have correct state.
const KMemoryState first_state = info.state;
const KMemoryPermission first_perm = info.perm;
const KMemoryAttribute first_attr = info.attribute;
while (true) {
// Validate the current block.
R_UNLESS(info.state == first_state, ResultInvalidCurrentMemory);
R_UNLESS(info.perm == first_perm, ResultInvalidCurrentMemory);
R_UNLESS((info.attribute | ignore_attr) == (first_attr | ignore_attr),
ResultInvalidCurrentMemory);
// Validate against the provided masks.
R_TRY(this->CheckMemoryState(info, state_mask, state, perm_mask, perm, attr_mask, attr));
// Break once we're done.
if (last_addr <= info.GetLastAddress()) {
break;
}
// Advance our iterator.
it++;
ASSERT(it != block_manager->cend());
info = it->GetMemoryInfo();
}
// If the end address isn't aligned, we need a block.
const size_t blocks_for_end_align =
(Common::AlignUp(addr + size, PageSize) != info.GetEndAddress()) ? 1 : 0;
// Write output state.
if (out_state != nullptr) {
*out_state = first_state;
}
if (out_perm != nullptr) {
*out_perm = first_perm;
}
if (out_attr != nullptr) {
*out_attr = static_cast<KMemoryAttribute>(first_attr & ~ignore_attr);
}
if (out_blocks_needed != nullptr) {
*out_blocks_needed = blocks_for_start_align + blocks_for_end_align;
}
return ResultSuccess;
}
} // namespace Kernel
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