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kern: devirtualize most things that are free to devirtualize (see #1672)

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This commit is contained in:
Michael Scire 2021-10-24 13:04:31 -07:00
parent aaa3770806
commit d0cd511c0e
13 changed files with 89 additions and 89 deletions
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35
libraries/libmesosphere/include/mesosphere/arch/arm64/init/kern_k_init_page_table.hpp
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@ -34,19 +34,22 @@ namespace ams::kern::arch::arm64::init {
}
}
class KInitialPageTable {
public:
class IPageAllocator {
public:
virtual KPhysicalAddress Allocate(size_t size) = 0;
virtual void Free(KPhysicalAddress phys_addr, size_t size) = 0;
/* NOTE: Nintendo uses virtual functions, rather than a concept + template. */
template<typename T>
concept IsInitialPageAllocator = requires (T &t, KPhysicalAddress phys_addr, size_t size) {
{ t.Allocate(size) } -> std::same_as<KPhysicalAddress>;
{ t.Free(phys_addr, size) } -> std::same_as<void>;
};
template<IsInitialPageAllocator _PageAllocator>
class KInitialPageTableTemplate {
public:
using PageAllocator = _PageAllocator;
private:
KPhysicalAddress m_l1_tables[2];
u32 m_num_entries[2];
public:
KInitialPageTable(KVirtualAddress start_address, KVirtualAddress end_address, IPageAllocator &allocator) {
KInitialPageTableTemplate(KVirtualAddress start_address, KVirtualAddress end_address, PageAllocator &allocator) {
/* Set tables. */
m_l1_tables[0] = AllocateNewPageTable(allocator);
m_l1_tables[1] = AllocateNewPageTable(allocator);
@ -56,7 +59,7 @@ namespace ams::kern::arch::arm64::init {
m_num_entries[1] = ((end_address / L1BlockSize) & (MaxPageTableEntries - 1)) - ((start_address / L1BlockSize) & (MaxPageTableEntries - 1)) + 1;
}
KInitialPageTable() {
KInitialPageTableTemplate() {
/* Set tables. */
m_l1_tables[0] = util::AlignDown(cpu::GetTtbr0El1(), PageSize);
m_l1_tables[1] = util::AlignDown(cpu::GetTtbr1El1(), PageSize);
@ -95,7 +98,7 @@ namespace ams::kern::arch::arm64::init {
return l3_table + ((GetInteger(address) / L3BlockSize) & (MaxPageTableEntries - 1));
}
static ALWAYS_INLINE KPhysicalAddress AllocateNewPageTable(IPageAllocator &allocator) {
static ALWAYS_INLINE KPhysicalAddress AllocateNewPageTable(PageAllocator &allocator) {
auto address = allocator.Allocate(PageSize);
ClearNewPageTable(address);
return address;
@ -323,7 +326,7 @@ namespace ams::kern::arch::arm64::init {
}
}
public:
void NOINLINE Map(KVirtualAddress virt_addr, size_t size, KPhysicalAddress phys_addr, const PageTableEntry &attr, IPageAllocator &allocator) {
void NOINLINE Map(KVirtualAddress virt_addr, size_t size, KPhysicalAddress phys_addr, const PageTableEntry &attr, PageAllocator &allocator) {
/* Ensure that addresses and sizes are page aligned. */
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(phys_addr), PageSize));
@ -700,10 +703,9 @@ namespace ams::kern::arch::arm64::init {
this->PhysicallyRandomize(virt_addr, size, L3BlockSize, do_copy);
cpu::StoreEntireCacheForInit();
}
};
class KInitialPageAllocator final : public KInitialPageTable::IPageAllocator {
class KInitialPageAllocator final {
private:
static constexpr inline size_t FreeUnitSize = BITSIZEOF(u64) * PageSize;
struct FreeListEntry {
@ -807,11 +809,11 @@ namespace ams::kern::arch::arm64::init {
}
}
virtual KPhysicalAddress Allocate(size_t size) override {
KPhysicalAddress Allocate(size_t size) {
return this->Allocate(size, size);
}
virtual void Free(KPhysicalAddress phys_addr, size_t size) override {
void Free(KPhysicalAddress phys_addr, size_t size) {
auto **prev_next = std::addressof(m_state.free_head);
auto *new_chunk = reinterpret_cast<FreeListEntry *>(GetInteger(phys_addr));
if (auto *cur = m_state.free_head; cur != nullptr) {
@ -863,5 +865,8 @@ namespace ams::kern::arch::arm64::init {
*prev_next = new_chunk;
}
};
static_assert(IsInitialPageAllocator<KInitialPageAllocator>);
using KInitialPageTable = KInitialPageTableTemplate<KInitialPageAllocator>;
}

5
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_debug.hpp
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@ -34,8 +34,9 @@ namespace ams::kern::arch::arm64 {
static void PostDestroy(uintptr_t arg) { MESOSPHERE_UNUSED(arg); /* ... */ }
public:
virtual Result GetThreadContextImpl(ams::svc::ThreadContext *out, KThread *thread, u32 context_flags) override;
virtual Result SetThreadContextImpl(const ams::svc::ThreadContext &ctx, KThread *thread, u32 context_flags) override;
/* NOTE: These are virtual in Nintendo's kernel. */
Result GetThreadContextImpl(ams::svc::ThreadContext *out, KThread *thread, u32 context_flags);
Result SetThreadContextImpl(const ams::svc::ThreadContext &ctx, KThread *thread, u32 context_flags);
private:
Result GetFpuContext(ams::svc::ThreadContext *out, KThread *thread, u32 context_flags);
Result SetFpuContext(const ams::svc::ThreadContext &ctx, KThread *thread, u32 context_flags);

7
libraries/libmesosphere/include/mesosphere/kern_k_auto_object.hpp
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@ -38,11 +38,11 @@ namespace ams::kern {
static constexpr inline ClassTokenType ClassToken() { return ::ams::kern::ClassToken<CLASS>; } \
public: \
using BaseClass = BASE_CLASS; \
static constexpr ALWAYS_INLINE TypeObj GetStaticTypeObj() { \
static consteval ALWAYS_INLINE TypeObj GetStaticTypeObj() { \
constexpr ClassTokenType Token = ClassToken(); \
return TypeObj(TypeName, Token); \
} \
static constexpr ALWAYS_INLINE const char *GetStaticTypeName() { return TypeName; } \
static consteval ALWAYS_INLINE const char *GetStaticTypeName() { return TypeName; } \
virtual TypeObj GetTypeObj() const { return GetStaticTypeObj(); } \
virtual const char *GetTypeName() { return GetStaticTypeName(); } \
private:
@ -143,7 +143,8 @@ namespace ams::kern {
/* is already using CRTP for slab heap, we have devirtualized it for performance gain. */
/* virtual void Finalize() { MESOSPHERE_ASSERT_THIS(); } */
virtual KProcess *GetOwner() const { return nullptr; }
/* NOTE: This is a virtual function which is unused-except-for-debug in Nintendo's kernel. */
/* virtual KProcess *GetOwner() const { return nullptr; } */
u32 GetReferenceCount() const {
return m_ref_count.GetValue();

35
libraries/libmesosphere/include/mesosphere/kern_k_auto_object_container.hpp
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@ -60,9 +60,38 @@ namespace ams::kern {
void Initialize() { MESOSPHERE_ASSERT_THIS(); }
void Finalize() { MESOSPHERE_ASSERT_THIS(); }
void Register(KAutoObjectWithList *obj);
void Unregister(KAutoObjectWithList *obj);
size_t GetOwnedCount(KProcess *owner);
void Register(KAutoObjectWithList *obj) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
m_object_list.insert(*obj);
}
void Unregister(KAutoObjectWithList *obj) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
m_object_list.erase(m_object_list.iterator_to(*obj));
}
template<typename T> requires (std::derived_from<T, KAutoObjectWithList> && requires (const T &t) { { t.GetOwner() } -> std::convertible_to<const KProcess *>; })
size_t GetOwnedCount(const KProcess *owner) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
size_t count = 0;
for (const auto &obj : m_object_list) {
if (const T * const derived = obj.DynamicCast<T *>(); derived != nullptr && derived->GetOwner() == owner) {
++count;
}
}
return count;
}
};

8
libraries/libmesosphere/include/mesosphere/kern_k_debug_base.hpp
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@ -38,6 +38,7 @@ namespace ams::kern {
bool Is64Bit() const;
public:
void Initialize();
void Finalize();
Result Attach(KProcess *process);
Result BreakProcess();
@ -52,9 +53,6 @@ namespace ams::kern {
Result GetThreadContext(ams::svc::ThreadContext *out, u64 thread_id, u32 context_flags);
Result SetThreadContext(const ams::svc::ThreadContext &ctx, u64 thread_id, u32 context_flags);
virtual Result GetThreadContextImpl(ams::svc::ThreadContext *out, KThread *thread, u32 context_flags) = 0;
virtual Result SetThreadContextImpl(const ams::svc::ThreadContext &ctx, KThread *thread, u32 context_flags) = 0;
Result GetRunningThreadInfo(ams::svc::LastThreadContext *out_context, u64 *out_thread_id);
Result GetDebugEventInfo(ams::svc::lp64::DebugEventInfo *out);
@ -82,8 +80,10 @@ namespace ams::kern {
template<typename T> requires (std::same_as<T, ams::svc::lp64::DebugEventInfo> || std::same_as<T, ams::svc::ilp32::DebugEventInfo>)
Result GetDebugEventInfoImpl(T *out);
public:
virtual void OnFinalizeSynchronizationObject() override;
virtual bool IsSignaled() const override;
private:
/* NOTE: This is public/virtual override in Nintendo's kernel. */
void OnFinalizeSynchronizationObject();
private:
static Result ProcessDebugEvent(ams::svc::DebugEvent event, uintptr_t param0, uintptr_t param1, uintptr_t param2, uintptr_t param3, uintptr_t param4);
public:

2
libraries/libmesosphere/include/mesosphere/kern_k_event.hpp
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@ -46,7 +46,7 @@ namespace ams::kern {
static void PostDestroy(uintptr_t arg);
virtual KProcess *GetOwner() const override { return m_owner; }
KProcess *GetOwner() const { return m_owner; }
KReadableEvent &GetReadableEvent() { return m_readable_event; }

3
libraries/libmesosphere/include/mesosphere/kern_k_synchronization_object.hpp
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@ -35,7 +35,8 @@ namespace ams::kern {
constexpr ALWAYS_INLINE explicit KSynchronizationObject(util::ConstantInitializeTag) : KAutoObjectWithList(util::ConstantInitialize), m_thread_list_head(), m_thread_list_tail() { MESOSPHERE_ASSERT_THIS(); }
ALWAYS_INLINE explicit KSynchronizationObject() : m_thread_list_head(), m_thread_list_tail() { MESOSPHERE_ASSERT_THIS(); }
virtual void OnFinalizeSynchronizationObject() { MESOSPHERE_ASSERT_THIS(); }
/* NOTE: This is a virtual function which is overridden only by KDebugBase in Nintendo's kernel. */
/* virtual void OnFinalizeSynchronizationObject() { MESOSPHERE_ASSERT_THIS(); } */
void NotifyAvailable(Result result);
ALWAYS_INLINE void NotifyAvailable() {

6
libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp
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@ -620,7 +620,7 @@ namespace ams::kern {
void Finalize();
virtual bool IsSignaled() const override;
virtual void OnTimer() override;
void OnTimer();
virtual void DoWorkerTask() override;
public:
static constexpr bool IsConditionVariableThreadTreeValid() {
@ -674,4 +674,8 @@ namespace ams::kern {
GetCurrentThread().SetClosedObject(this);
}
ALWAYS_INLINE void KTimerTask::OnTimer() {
static_cast<KThread *>(this)->OnTimer();
}
}

5
libraries/libmesosphere/include/mesosphere/kern_k_timer_task.hpp
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@ -41,8 +41,9 @@ namespace ams::kern {
return m_time;
}
virtual void OnTimer() = 0;
/* NOTE: This is virtual in Nintendo's kernel. Prior to 13.0.0, KWaitObject was also a TimerTask; this is no longer the case. */
/* Since this is now KThread exclusive, we have devirtualized (see inline declaration for this inside kern_kthread.hpp). */
void OnTimer();
};
}

53
libraries/libmesosphere/source/kern_k_auto_object_container.cpp
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@ -1,53 +0,0 @@
/*
* Copyright (c) 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 {
void KAutoObjectWithListContainer::Register(KAutoObjectWithList *obj) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
m_object_list.insert(*obj);
}
void KAutoObjectWithListContainer::Unregister(KAutoObjectWithList *obj) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
m_object_list.erase(m_object_list.iterator_to(*obj));
}
size_t KAutoObjectWithListContainer::GetOwnedCount(KProcess *owner) {
MESOSPHERE_ASSERT_THIS();
KScopedLightLock lk(m_lock);
size_t count = 0;
for (auto &obj : m_object_list) {
if (obj.GetOwner() == owner) {
count++;
}
}
return count;
}
}

14
libraries/libmesosphere/source/kern_k_debug_base.cpp
View File

@ -528,7 +528,8 @@ namespace ams::kern {
}
/* Get the thread context. */
return this->GetThreadContextImpl(out, thread, context_flags);
static_assert(std::derived_from<KDebug, KDebugBase>);
return static_cast<KDebug *>(this)->GetThreadContextImpl(out, thread, context_flags);
}
}
@ -619,7 +620,8 @@ namespace ams::kern {
}
/* Set the thread context. */
return this->SetThreadContextImpl(ctx, thread, context_flags);
static_assert(std::derived_from<KDebug, KDebugBase>);
return static_cast<KDebug *>(this)->SetThreadContextImpl(ctx, thread, context_flags);
}
}
@ -984,6 +986,14 @@ namespace ams::kern {
return this->GetDebugEventInfoImpl(out);
}
void KDebugBase::Finalize() {
/* Perform base finalization. */
KSynchronizationObject::Finalize();
/* Perform post-synchronization finalization. */
this->OnFinalizeSynchronizationObject();
}
void KDebugBase::OnFinalizeSynchronizationObject() {
/* Detach from our process, if we have one. */
if (this->IsAttached() && this->OpenProcess()) {

3
libraries/libmesosphere/source/kern_k_synchronization_object.cpp
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@ -83,7 +83,8 @@ namespace ams::kern {
}
#endif
this->OnFinalizeSynchronizationObject();
/* NOTE: In Nintendo's kernel, the following is virtual and called here. */
/* this->OnFinalizeSynchronizationObject(); */
}
Result KSynchronizationObject::Wait(s32 *out_index, KSynchronizationObject **objects, const s32 num_objects, s64 timeout) {

2
mesosphere/kernel_ldr/source/kern_init_loader.cpp
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@ -62,7 +62,7 @@ namespace ams::kern::init::loader {
}
}
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::IPageAllocator &allocator) {
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::PageAllocator &allocator) {
/* Map in an RWX identity mapping for the kernel. */
constexpr PageTableEntry KernelRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
init_pt.Map(base_address, kernel_size, base_address, KernelRWXIdentityAttribute, allocator);