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kern: add minimum alignment support to KMemoryManager

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Michael Scire 2024-10-09 21:36:49 -07:00 • committed by SciresM
parent ff38a32a9b
commit 912b84c4e3
7 changed files with 58 additions and 16 deletions
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33
libraries/libmesosphere/source/kern_k_memory_manager.cpp
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@ -35,7 +35,7 @@ namespace ams::kern {
}
void KMemoryManager::Initialize(KVirtualAddress management_region, size_t management_region_size) {
void KMemoryManager::Initialize(KVirtualAddress management_region, size_t management_region_size, const u32 *min_align_shifts) {
/* Clear the management region to zero. */
const KVirtualAddress management_region_end = management_region + management_region_size;
std::memset(GetVoidPointer(management_region), 0, management_region_size);
@ -154,6 +154,17 @@ namespace ams::kern {
for (size_t i = 0; i < m_num_managers; ++i) {
m_managers[i].SetInitialUsedHeapSize(reserved_sizes[i]);
}
/* Determine the min heap size for all pools. */
for (size_t i = 0; i < Pool_Count; ++i) {
/* Determine the min alignment for the pool in pages. */
const size_t min_align_pages = 1 << min_align_shifts[i];
/* Determine a heap index. */
if (const auto heap_index = KPageHeap::GetAlignedBlockIndex(min_align_pages, min_align_pages); heap_index >= 0) {
m_min_heap_indexes[i] = heap_index;
}
}
}
Result KMemoryManager::InitializeOptimizedMemory(u64 process_id, Pool pool) {
@ -192,8 +203,19 @@ namespace ams::kern {
return Null<KPhysicalAddress>;
}
/* Lock the pool that we're allocating from. */
/* Determine the pool and direction we're allocating from. */
const auto [pool, dir] = DecodeOption(option);
/* Check that we're allocating a correctly aligned number of pages. */
const size_t min_align_pages = KPageHeap::GetBlockNumPages(m_min_heap_indexes[pool]);
if (!util::IsAligned(num_pages, min_align_pages)) {
return Null<KPhysicalAddress>;
}
/* Update our alignment. */
align_pages = std::max(align_pages, min_align_pages);
/* Lock the pool that we're allocating from. */
KScopedLightLock lk(m_pool_locks[pool]);
/* Choose a heap based on our page size request. */
@ -226,6 +248,13 @@ namespace ams::kern {
}
Result KMemoryManager::AllocatePageGroupImpl(KPageGroup *out, size_t num_pages, Pool pool, Direction dir, bool unoptimized, bool random, s32 min_heap_index) {
/* Check that we're allocating a correctly aligned number of pages. */
const size_t min_align_pages = KPageHeap::GetBlockNumPages(m_min_heap_indexes[pool]);
R_UNLESS(util::IsAligned(num_pages, min_align_pages), svc::ResultInvalidSize());
/* Adjust our min heap index to the pool minimum if needed. */
min_heap_index = std::max(min_heap_index, m_min_heap_indexes[pool]);
/* Choose a heap based on our page size request. */
const s32 heap_index = KPageHeap::GetBlockIndex(num_pages);
R_UNLESS(0 <= heap_index, svc::ResultOutOfMemory());