/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
namespace {
constexpr KMemoryManager::Pool GetPoolFromMemoryRegionType(u32 type) {
switch (type) {
case KMemoryRegionType_VirtualDramApplicationPool: return KMemoryManager::Pool_Application;
case KMemoryRegionType_VirtualDramAppletPool: return KMemoryManager::Pool_Applet;
case KMemoryRegionType_VirtualDramSystemPool: return KMemoryManager::Pool_System;
case KMemoryRegionType_VirtualDramSystemNonSecurePool: return KMemoryManager::Pool_SystemNonSecure;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
}
}
void KMemoryManager::Initialize(KVirtualAddress metadata_region, size_t metadata_region_size) {
/* Clear the metadata region to zero. */
const KVirtualAddress metadata_region_end = metadata_region + metadata_region_size;
std::memset(GetVoidPointer(metadata_region), 0, metadata_region_size);
/* Traverse the virtual memory layout tree, initializing each manager as appropriate. */
while (true) {
/* Locate the region that should initialize the current manager. */
const KMemoryRegion *region = nullptr;
for (const auto &it : KMemoryLayout::GetVirtualMemoryRegionTree()) {
/* We only care about regions that we need to create managers for. */
if (!it.IsDerivedFrom(KMemoryRegionType_VirtualDramManagedPool)) {
continue;
}
/* We want to initialize the managers in order. */
if (it.GetAttributes() != this->num_managers) {
continue;
}
region = std::addressof(it);
break;
}
/* If we didn't find a region, then we're done initializing managers. */
if (region == nullptr) {
break;
}
/* Ensure that the region is correct. */
MESOSPHERE_ASSERT(region->GetAddress() != Null<decltype(region->GetAddress())>);
MESOSPHERE_ASSERT(region->GetSize() > 0);
MESOSPHERE_ASSERT(region->GetEndAddress() >= region->GetAddress());
MESOSPHERE_ASSERT(region->IsDerivedFrom(KMemoryRegionType_VirtualDramManagedPool));
MESOSPHERE_ASSERT(region->GetAttributes() == this->num_managers);
/* Initialize a new manager for the region. */
const Pool pool = GetPoolFromMemoryRegionType(region->GetType());
Impl *manager = std::addressof(this->managers[this->num_managers++]);
MESOSPHERE_ABORT_UNLESS(this->num_managers <= util::size(this->managers));
const size_t cur_size = manager->Initialize(region, pool, metadata_region, metadata_region_end);
metadata_region += cur_size;
MESOSPHERE_ABORT_UNLESS(metadata_region <= metadata_region_end);
/* Insert the manager into the pool list. */
if (this->pool_managers_tail[pool] == nullptr) {
this->pool_managers_head[pool] = manager;
} else {
this->pool_managers_tail[pool]->SetNext(manager);
manager->SetPrev(this->pool_managers_tail[pool]);
}
this->pool_managers_tail[pool] = manager;
}
}
KVirtualAddress KMemoryManager::AllocateContinuous(size_t num_pages, size_t align_pages, u32 option) {
/* Early return if we're allocating no pages. */
if (num_pages == 0) {
return Null<KVirtualAddress>;
}
/* Lock the pool that we're allocating from. */
const auto [pool, dir] = DecodeOption(option);
KScopedLightLock lk(this->pool_locks[pool]);
/* Choose a heap based on our page size request. */
const s32 heap_index = KPageHeap::GetAlignedBlockIndex(num_pages, align_pages);
/* Loop, trying to iterate from each block. */
Impl *chosen_manager = nullptr;
KVirtualAddress allocated_block = Null<KVirtualAddress>;
for (chosen_manager = this->GetFirstManager(pool, dir); chosen_manager != nullptr; chosen_manager = this->GetNextManager(chosen_manager, dir)) {
allocated_block = chosen_manager->AllocateBlock(heap_index, true);
if (allocated_block != Null<KVirtualAddress>) {
break;
}
}
/* If we failed to allocate, quit now. */
if (allocated_block == Null<KVirtualAddress>) {
return Null<KVirtualAddress>;
}
/* If we allocated more than we need, free some. */
const size_t allocated_pages = KPageHeap::GetBlockNumPages(heap_index);
if (allocated_pages > num_pages) {
chosen_manager->Free(allocated_block + num_pages * PageSize, allocated_pages - num_pages);
}
/* Maintain the optimized memory bitmap, if we should. */
if (this->has_optimized_process[pool]) {
chosen_manager->TrackAllocationForOptimizedProcess(allocated_block, num_pages);
}
return allocated_block;
}
Result KMemoryManager::AllocatePageGroupImpl(KPageGroup *out, size_t num_pages, Pool pool, Direction dir, bool optimize, bool random) {
/* Choose a heap based on our page size request. */
const s32 heap_index = KPageHeap::GetBlockIndex(num_pages);
R_UNLESS(0 <= heap_index, svc::ResultOutOfMemory());
/* Ensure that we don't leave anything un-freed. */
auto group_guard = SCOPE_GUARD {
for (const auto &it : *out) {
auto &manager = this->GetManager(it.GetAddress());
const size_t num_pages = std::min(it.GetNumPages(), (manager.GetEndAddress() - it.GetAddress()) / PageSize);
manager.Free(it.GetAddress(), num_pages);
}
out->Finalize();
};
/* Keep allocating until we've allocated all our pages. */
for (s32 index = heap_index; index >= 0 && num_pages > 0; index--) {
const size_t pages_per_alloc = KPageHeap::GetBlockNumPages(index);
for (Impl *cur_manager = this->GetFirstManager(pool, dir); cur_manager != nullptr; cur_manager = this->GetNextManager(cur_manager, dir)) {
while (num_pages >= pages_per_alloc) {
/* Allocate a block. */
KVirtualAddress allocated_block = cur_manager->AllocateBlock(index, random);
if (allocated_block == Null<KVirtualAddress>) {
break;
}
/* Safely add it to our group. */
{
auto block_guard = SCOPE_GUARD { cur_manager->Free(allocated_block, pages_per_alloc); };
R_TRY(out->AddBlock(allocated_block, pages_per_alloc));
block_guard.Cancel();
}
/* Maintain the optimized memory bitmap, if we should. */
if (optimize) {
cur_manager->TrackAllocationForOptimizedProcess(allocated_block, pages_per_alloc);
}
num_pages -= pages_per_alloc;
}
}
}
/* Only succeed if we allocated as many pages as we wanted. */
MESOSPHERE_ASSERT(num_pages >= 0);
R_UNLESS(num_pages == 0, svc::ResultOutOfMemory());
/* We succeeded! */
group_guard.Cancel();
return ResultSuccess();
}
Result KMemoryManager::Allocate(KPageGroup *out, size_t num_pages, u32 option) {
MESOSPHERE_ASSERT(out != nullptr);
MESOSPHERE_ASSERT(out->GetNumPages() == 0);
/* Early return if we're allocating no pages. */
R_SUCCEED_IF(num_pages == 0);
/* Lock the pool that we're allocating from. */
const auto [pool, dir] = DecodeOption(option);
KScopedLightLock lk(this->pool_locks[pool]);
/* Allocate the page group. */
return this->AllocatePageGroupImpl(out, num_pages, pool, dir, this->has_optimized_process[pool], true);
}
size_t KMemoryManager::Impl::Initialize(const KMemoryRegion *region, Pool p, KVirtualAddress metadata, KVirtualAddress metadata_end) {
/* Calculate metadata sizes. */
const size_t ref_count_size = (region->GetSize() / PageSize) * sizeof(u16);
const size_t optimize_map_size = (util::AlignUp((region->GetSize() / PageSize), BITSIZEOF(u64)) / BITSIZEOF(u64)) * sizeof(u64);
const size_t manager_size = util::AlignUp(optimize_map_size + ref_count_size, PageSize);
const size_t page_heap_size = KPageHeap::CalculateMetadataOverheadSize(region->GetSize());
const size_t total_metadata_size = manager_size + page_heap_size;
MESOSPHERE_ABORT_UNLESS(manager_size <= total_metadata_size);
MESOSPHERE_ABORT_UNLESS(metadata + total_metadata_size <= metadata_end);
MESOSPHERE_ABORT_UNLESS(util::IsAligned(total_metadata_size, PageSize));
/* Setup region. */
this->pool = p;
this->metadata_region = metadata;
this->page_reference_counts = GetPointer<RefCount>(metadata + optimize_map_size);
MESOSPHERE_ABORT_UNLESS(util::IsAligned(GetInteger(this->metadata_region), PageSize));
/* Initialize the manager's KPageHeap. */
this->heap.Initialize(region->GetAddress(), region->GetSize(), metadata + manager_size, page_heap_size);
/* Free the memory to the heap. */
this->heap.Free(region->GetAddress(), region->GetSize() / PageSize);
/* Update the heap's used size. */
this->heap.UpdateUsedSize();
return total_metadata_size;
}
void KMemoryManager::Impl::TrackAllocationForOptimizedProcess(KVirtualAddress block, size_t num_pages) {
size_t offset = this->heap.GetPageOffset(block);
const size_t last = offset + num_pages - 1;
u64 *optimize_map = GetPointer<u64>(this->metadata_region);
while (offset <= last) {
optimize_map[offset / BITSIZEOF(u64)] &= ~(u64(1) << (offset % BITSIZEOF(u64)));
offset++;
}
}
size_t KMemoryManager::Impl::CalculateMetadataOverheadSize(size_t region_size) {
const size_t ref_count_size = (region_size / PageSize) * sizeof(u16);
const size_t optimize_map_size = (util::AlignUp((region_size / PageSize), BITSIZEOF(u64)) / BITSIZEOF(u64)) * sizeof(u64);
const size_t manager_meta_size = util::AlignUp(optimize_map_size + ref_count_size, PageSize);
const size_t page_heap_size = KPageHeap::CalculateMetadataOverheadSize(region_size);
return manager_meta_size + page_heap_size;
}
}