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// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "common/scope_exit.h"
#include "core/hle/kernel/k_memory_manager.h"
#include "core/hle/kernel/k_page_linked_list.h"
#include "core/hle/kernel/svc_results.h"
namespace Kernel {
std::size_t KMemoryManager::Impl::Initialize(Pool new_pool, u64 start_address, u64 end_address) {
const auto size{end_address - start_address};
// Calculate metadata sizes
const auto ref_count_size{(size / PageSize) * sizeof(u16)};
const auto optimize_map_size{(Common::AlignUp((size / PageSize), 64) / 64) * sizeof(u64)};
const auto manager_size{Common::AlignUp(optimize_map_size + ref_count_size, PageSize)};
const auto page_heap_size{KPageHeap::CalculateManagementOverheadSize(size)};
const auto total_metadata_size{manager_size + page_heap_size};
ASSERT(manager_size <= total_metadata_size);
ASSERT(Common::IsAligned(total_metadata_size, PageSize));
// Setup region
pool = new_pool;
// Initialize the manager's KPageHeap
heap.Initialize(start_address, size, page_heap_size);
// Free the memory to the heap
heap.Free(start_address, size / PageSize);
// Update the heap's used size
heap.UpdateUsedSize();
return total_metadata_size;
}
void KMemoryManager::InitializeManager(Pool pool, u64 start_address, u64 end_address) {
ASSERT(pool < Pool::Count);
managers[static_cast<std::size_t>(pool)].Initialize(pool, start_address, end_address);
}
VAddr KMemoryManager::AllocateAndOpenContinuous(std::size_t num_pages, std::size_t align_pages,
u32 option) {
// Early return if we're allocating no pages
if (num_pages == 0) {
return {};
}
// Lock the pool that we're allocating from
const auto [pool, dir] = DecodeOption(option);
const auto pool_index{static_cast<std::size_t>(pool)};
std::lock_guard lock{pool_locks[pool_index]};
// 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
// TODO (bunnei): Support multiple managers
Impl& chosen_manager{managers[pool_index]};
VAddr allocated_block{chosen_manager.AllocateBlock(heap_index, false)};
// If we failed to allocate, quit now
if (!allocated_block) {
return {};
}
// If we allocated more than we need, free some
const auto allocated_pages{KPageHeap::GetBlockNumPages(heap_index)};
if (allocated_pages > num_pages) {
chosen_manager.Free(allocated_block + num_pages * PageSize, allocated_pages - num_pages);
}
return allocated_block;
}
ResultCode KMemoryManager::Allocate(KPageLinkedList& page_list, std::size_t num_pages, Pool pool,
Direction dir) {
ASSERT(page_list.GetNumPages() == 0);
// Early return if we're allocating no pages
if (num_pages == 0) {
return ResultSuccess;
}
// Lock the pool that we're allocating from
const auto pool_index{static_cast<std::size_t>(pool)};
std::lock_guard lock{pool_locks[pool_index]};
// Choose a heap based on our page size request
const s32 heap_index{KPageHeap::GetBlockIndex(num_pages)};
if (heap_index < 0) {
return ResultOutOfMemory;
}
// TODO (bunnei): Support multiple managers
Impl& chosen_manager{managers[pool_index]};
// Ensure that we don't leave anything un-freed
auto group_guard = detail::ScopeExit([&] {
for (const auto& it : page_list.Nodes()) {
const auto min_num_pages{std::min<size_t>(
it.GetNumPages(), (chosen_manager.GetEndAddress() - it.GetAddress()) / PageSize)};
chosen_manager.Free(it.GetAddress(), min_num_pages);
}
});
// Keep allocating until we've allocated all our pages
for (s32 index{heap_index}; index >= 0 && num_pages > 0; index--) {
const auto pages_per_alloc{KPageHeap::GetBlockNumPages(index)};
while (num_pages >= pages_per_alloc) {
// Allocate a block
VAddr allocated_block{chosen_manager.AllocateBlock(index, false)};
if (!allocated_block) {
break;
}
// Safely add it to our group
{
auto block_guard = detail::ScopeExit(
[&] { chosen_manager.Free(allocated_block, pages_per_alloc); });
if (const ResultCode result{page_list.AddBlock(allocated_block, pages_per_alloc)};
result.IsError()) {
return result;
}
block_guard.Cancel();
}
num_pages -= pages_per_alloc;
}
}
// Only succeed if we allocated as many pages as we wanted
if (num_pages) {
return ResultOutOfMemory;
}
// We succeeded!
group_guard.Cancel();
return ResultSuccess;
}
ResultCode KMemoryManager::Free(KPageLinkedList& page_list, std::size_t num_pages, Pool pool,
Direction dir) {
// Early return if we're freeing no pages
if (!num_pages) {
return ResultSuccess;
}
// Lock the pool that we're freeing from
const auto pool_index{static_cast<std::size_t>(pool)};
std::lock_guard lock{pool_locks[pool_index]};
// TODO (bunnei): Support multiple managers
Impl& chosen_manager{managers[pool_index]};
// Free all of the pages
for (const auto& it : page_list.Nodes()) {
const auto min_num_pages{std::min<size_t>(
it.GetNumPages(), (chosen_manager.GetEndAddress() - it.GetAddress()) / PageSize)};
chosen_manager.Free(it.GetAddress(), min_num_pages);
}
return ResultSuccess;
}
std::size_t KMemoryManager::Impl::CalculateManagementOverheadSize(std::size_t region_size) {
const std::size_t ref_count_size = (region_size / PageSize) * sizeof(u16);
const std::size_t optimize_map_size =
(Common::AlignUp((region_size / PageSize), Common::BitSize<u64>()) /
Common::BitSize<u64>()) *
sizeof(u64);
const std::size_t manager_meta_size =
Common::AlignUp(optimize_map_size + ref_count_size, PageSize);
const std::size_t page_heap_size = KPageHeap::CalculateManagementOverheadSize(region_size);
return manager_meta_size + page_heap_size;
}
} // namespace Kernel
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