mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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610 lines
23 KiB
C++
610 lines
23 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mesosphere.hpp>
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namespace ams::kern {
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namespace {
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constexpr bool IsKernelAddressKey(KProcessAddress key) {
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const uintptr_t key_uptr = GetInteger(key);
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return KernelVirtualAddressSpaceBase <= key_uptr && key_uptr <= KernelVirtualAddressSpaceLast;
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}
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void CleanupKernelStack(uintptr_t stack_top) {
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const uintptr_t stack_bottom = stack_top - PageSize;
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KPhysicalAddress stack_paddr = Null<KPhysicalAddress>;
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MESOSPHERE_ABORT_UNLESS(Kernel::GetKernelPageTable().GetPhysicalAddress(&stack_paddr, stack_bottom));
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MESOSPHERE_R_ABORT_UNLESS(Kernel::GetKernelPageTable().UnmapPages(stack_bottom, 1, KMemoryState_Kernel));
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/* Free the stack page. */
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KPageBuffer::Free(KPageBuffer::FromPhysicalAddress(stack_paddr));
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}
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}
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Result KThread::Initialize(KThreadFunction func, uintptr_t arg, void *kern_stack_top, KProcessAddress user_stack_top, s32 prio, s32 core, KProcess *owner, ThreadType type) {
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/* Assert parameters are valid. */
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(kern_stack_top != nullptr);
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MESOSPHERE_ASSERT((type == ThreadType_Main) || (ams::svc::HighestThreadPriority <= prio && prio <= ams::svc::LowestThreadPriority));
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MESOSPHERE_ASSERT((owner != nullptr) || (type != ThreadType_User));
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MESOSPHERE_ASSERT(0 <= core && core < static_cast<s32>(cpu::NumCores));
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/* First, clear the TLS address. */
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this->tls_address = Null<KProcessAddress>;
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const uintptr_t kern_stack_top_address = reinterpret_cast<uintptr_t>(kern_stack_top);
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/* Next, assert things based on the type. */
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switch (type) {
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case ThreadType_Main:
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{
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MESOSPHERE_ASSERT(arg == 0);
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}
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[[fallthrough]];
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case ThreadType_HighPriority:
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{
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MESOSPHERE_ASSERT(core == GetCurrentCoreId());
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}
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[[fallthrough]];
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case ThreadType_Kernel:
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{
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MESOSPHERE_ASSERT(user_stack_top == 0);
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MESOSPHERE_ASSERT(util::IsAligned(kern_stack_top_address, PageSize));
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}
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[[fallthrough]];
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case ThreadType_User:
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{
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MESOSPHERE_ASSERT(((owner == nullptr) || (owner->GetCoreMask() | (1ul << core)) == owner->GetCoreMask()));
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MESOSPHERE_ASSERT(((owner == nullptr) || (owner->GetPriorityMask() | (1ul << prio)) == owner->GetPriorityMask()));
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}
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break;
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default:
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MESOSPHERE_PANIC("KThread::Initialize: Unknown ThreadType %u", static_cast<u32>(type));
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break;
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}
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/* Set the ideal core ID and affinity mask. */
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this->ideal_core_id = core;
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this->affinity_mask.SetAffinity(core, true);
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/* Set the thread state. */
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this->thread_state = (type == ThreadType_Main) ? ThreadState_Runnable : ThreadState_Initialized;
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/* Set TLS address and TLS heap address. */
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/* NOTE: Nintendo wrote TLS address above already, but official code really does write tls address twice. */
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this->tls_address = 0;
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this->tls_heap_address = 0;
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/* Set parent and condvar tree. */
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this->parent = nullptr;
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this->cond_var = nullptr;
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/* Set sync booleans. */
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this->signaled = false;
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this->ipc_cancelled = false;
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this->termination_requested = false;
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this->wait_cancelled = false;
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this->cancellable = false;
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/* Set core ID and wait result. */
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this->core_id = this->ideal_core_id;
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this->wait_result = svc::ResultNoSynchronizationObject();
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/* Set the stack top. */
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this->kernel_stack_top = kern_stack_top;
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/* Set priorities. */
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this->priority = prio;
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this->base_priority = prio;
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/* Set sync object and waiting lock to null. */
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this->synced_object = nullptr;
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this->waiting_lock = nullptr;
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/* Initialize sleeping queue. */
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this->sleeping_queue_entry.Initialize();
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this->sleeping_queue = nullptr;
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/* Set suspend flags. */
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this->suspend_request_flags = 0;
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this->suspend_allowed_flags = ThreadState_SuspendFlagMask;
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/* We're neither debug attached, nor are we nesting our priority inheritance. */
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this->debug_attached = false;
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this->priority_inheritance_count = 0;
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/* We haven't been scheduled, and we have done no light IPC. */
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this->schedule_count = -1;
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this->last_scheduled_tick = 0;
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this->light_ipc_data = nullptr;
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/* We're not waiting for a lock, and we haven't disabled migration. */
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this->lock_owner = nullptr;
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this->num_core_migration_disables = 0;
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/* We have no waiters, but we do have an entrypoint. */
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this->num_kernel_waiters = 0;
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this->entrypoint = reinterpret_cast<uintptr_t>(func);
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/* We don't need a release (probably), and we've spent no time on the cpu. */
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this->resource_limit_release_hint = 0;
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this->cpu_time = 0;
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/* Clear our stack parameters. */
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std::memset(static_cast<void *>(std::addressof(this->GetStackParameters())), 0, sizeof(StackParameters));
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/* Setup the TLS, if needed. */
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if (type == ThreadType_User) {
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R_TRY(owner->CreateThreadLocalRegion(std::addressof(this->tls_address)));
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this->tls_heap_address = owner->GetThreadLocalRegionPointer(this->tls_address);
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std::memset(this->tls_heap_address, 0, ams::svc::ThreadLocalRegionSize);
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}
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/* Set parent, if relevant. */
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if (owner != nullptr) {
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this->parent = owner;
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this->parent->Open();
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this->parent->IncrementThreadCount();
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}
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/* Initialize thread context. */
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constexpr bool IsDefault64Bit = sizeof(uintptr_t) == sizeof(u64);
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const bool is_64_bit = this->parent ? this->parent->Is64Bit() : IsDefault64Bit;
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const bool is_user = (type == ThreadType_User);
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const bool is_main = (type == ThreadType_Main);
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this->thread_context.Initialize(this->entrypoint, reinterpret_cast<uintptr_t>(this->GetStackTop()), GetInteger(user_stack_top), arg, is_user, is_64_bit, is_main);
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/* Setup the stack parameters. */
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StackParameters &sp = this->GetStackParameters();
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if (this->parent != nullptr) {
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this->parent->CopySvcPermissionsTo(sp);
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}
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sp.context = std::addressof(this->thread_context);
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sp.disable_count = 1;
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this->SetInExceptionHandler();
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/* Set thread ID. */
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this->thread_id = s_next_thread_id++;
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/* We initialized! */
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this->initialized = true;
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/* Register ourselves with our parent process. */
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if (this->parent != nullptr) {
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this->parent->RegisterThread(this);
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if (this->parent->IsSuspended()) {
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this->RequestSuspend(SuspendType_Process);
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}
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}
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return ResultSuccess();
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}
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Result KThread::InitializeThread(KThread *thread, KThreadFunction func, uintptr_t arg, KProcessAddress user_stack_top, s32 prio, s32 core, KProcess *owner, ThreadType type) {
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/* Get stack region for the thread. */
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const auto &stack_region = KMemoryLayout::GetKernelStackRegion();
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/* Allocate a page to use as the thread. */
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KPageBuffer *page = KPageBuffer::Allocate();
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R_UNLESS(page != nullptr, svc::ResultOutOfResource());
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/* Map the stack page. */
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KProcessAddress stack_top = Null<KProcessAddress>;
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{
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KProcessAddress stack_bottom = Null<KProcessAddress>;
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auto page_guard = SCOPE_GUARD { KPageBuffer::Free(page); };
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R_TRY(Kernel::GetKernelPageTable().MapPages(std::addressof(stack_bottom), 1, PageSize, page->GetPhysicalAddress(), stack_region.GetAddress(),
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stack_region.GetSize() / PageSize, KMemoryState_Kernel, KMemoryPermission_KernelReadWrite));
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page_guard.Cancel();
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/* Calculate top of the stack. */
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stack_top = stack_bottom + PageSize;
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}
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/* Initialize the thread. */
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auto map_guard = SCOPE_GUARD { CleanupKernelStack(GetInteger(stack_top)); };
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R_TRY(thread->Initialize(func, arg, GetVoidPointer(stack_top), user_stack_top, prio, core, owner, type));
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map_guard.Cancel();
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return ResultSuccess();
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}
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void KThread::PostDestroy(uintptr_t arg) {
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KProcess *owner = reinterpret_cast<KProcess *>(arg & ~1ul);
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const bool resource_limit_release_hint = (arg & 1);
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const s64 hint_value = (resource_limit_release_hint ? 0 : 1);
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if (owner != nullptr) {
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owner->ReleaseResource(ams::svc::LimitableResource_ThreadCountMax, 1, hint_value);
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owner->Close();
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} else {
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Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_ThreadCountMax, 1, hint_value);
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}
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}
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void KThread::ResumeThreadsSuspendedForInit() {
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KThread::ListAccessor list_accessor;
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{
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KScopedSchedulerLock sl;
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for (auto &thread : list_accessor) {
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static_cast<KThread &>(thread).Resume(SuspendType_Init);
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}
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}
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}
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void KThread::Finalize() {
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MESOSPHERE_UNIMPLEMENTED();
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}
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bool KThread::IsSignaled() const {
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return this->signaled;
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}
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void KThread::Wakeup() {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock sl;
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if (this->GetState() == ThreadState_Waiting) {
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if (this->sleeping_queue != nullptr) {
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this->sleeping_queue->WakeupThread(this);
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} else {
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this->SetState(ThreadState_Runnable);
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}
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}
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}
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void KThread::OnTimer() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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this->Wakeup();
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}
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void KThread::DoWorkerTask() {
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MESOSPHERE_UNIMPLEMENTED();
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}
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void KThread::DisableCoreMigration() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(this == GetCurrentThreadPointer());
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KScopedSchedulerLock sl;
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MESOSPHERE_ASSERT(this->num_core_migration_disables >= 0);
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if ((this->num_core_migration_disables++) == 0) {
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/* Save our ideal state to restore when we can migrate again. */
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this->original_ideal_core_id = this->ideal_core_id;
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this->original_affinity_mask = this->affinity_mask;
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/* Bind outselves to this core. */
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const s32 active_core = this->GetActiveCore();
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this->ideal_core_id = active_core;
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this->affinity_mask.SetAffinityMask(1ul << active_core);
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if (this->affinity_mask.GetAffinityMask() != this->original_affinity_mask.GetAffinityMask()) {
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KScheduler::OnThreadAffinityMaskChanged(this, this->original_affinity_mask, active_core);
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}
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}
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}
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void KThread::EnableCoreMigration() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(this == GetCurrentThreadPointer());
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KScopedSchedulerLock sl;
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MESOSPHERE_ASSERT(this->num_core_migration_disables > 0);
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if ((--this->num_core_migration_disables) == 0) {
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const KAffinityMask old_mask = this->affinity_mask;
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/* Restore our ideals. */
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this->ideal_core_id = this->original_ideal_core_id;
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this->original_affinity_mask = this->affinity_mask;
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if (this->affinity_mask.GetAffinityMask() != old_mask.GetAffinityMask()) {
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const s32 active_core = this->GetActiveCore();
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if (!this->affinity_mask.GetAffinity(active_core)) {
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if (this->ideal_core_id >= 0) {
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this->SetActiveCore(this->ideal_core_id);
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} else {
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this->SetActiveCore(BITSIZEOF(unsigned long long) - 1 - __builtin_clzll(this->affinity_mask.GetAffinityMask()));
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}
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}
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KScheduler::OnThreadAffinityMaskChanged(this, old_mask, active_core);
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}
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}
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}
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Result KThread::SetPriorityToIdle() {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock sl;
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/* Change both our priorities to the idle thread priority. */
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const s32 old_priority = this->priority;
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this->priority = IdleThreadPriority;
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this->base_priority = IdleThreadPriority;
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KScheduler::OnThreadPriorityChanged(this, old_priority);
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return ResultSuccess();
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}
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void KThread::RequestSuspend(SuspendType type) {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock lk;
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/* Note the request in our flags. */
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this->suspend_request_flags |= (1u << (ThreadState_SuspendShift + type));
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/* Try to perform the suspend. */
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this->TrySuspend();
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}
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void KThread::Resume(SuspendType type) {
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MESOSPHERE_ASSERT_THIS();
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KScopedSchedulerLock sl;
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/* Clear the request in our flags. */
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this->suspend_request_flags &= ~(1u << (ThreadState_SuspendShift + type));
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/* Update our state. */
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const ThreadState old_state = this->thread_state;
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this->thread_state = static_cast<ThreadState>(this->GetSuspendFlags() | (old_state & ThreadState_Mask));
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if (this->thread_state != old_state) {
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KScheduler::OnThreadStateChanged(this, old_state);
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}
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}
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void KThread::TrySuspend() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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MESOSPHERE_ASSERT(this->IsSuspended());
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/* Ensure that we have no waiters. */
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if (this->GetNumKernelWaiters() > 0) {
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return;
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}
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MESOSPHERE_ABORT_UNLESS(this->GetNumKernelWaiters() == 0);
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/* Perform the suspend. */
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this->Suspend();
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}
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void KThread::Suspend() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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MESOSPHERE_ASSERT(this->IsSuspended());
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/* Set our suspend flags in state. */
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const auto old_state = this->thread_state;
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this->thread_state = static_cast<ThreadState>(this->GetSuspendFlags() | (old_state & ThreadState_Mask));
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/* Note the state change in scheduler. */
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KScheduler::OnThreadStateChanged(this, old_state);
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}
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void KThread::Continue() {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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/* Clear our suspend flags in state. */
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const auto old_state = this->thread_state;
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this->thread_state = static_cast<ThreadState>(old_state & ThreadState_Mask);
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/* Note the state change in scheduler. */
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KScheduler::OnThreadStateChanged(this, old_state);
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}
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void KThread::AddWaiterImpl(KThread *thread) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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/* Find the right spot to insert the waiter. */
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auto it = this->waiter_list.begin();
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while (it != this->waiter_list.end()) {
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if (it->GetPriority() > thread->GetPriority()) {
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break;
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}
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it++;
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}
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/* Keep track of how many kernel waiters we have. */
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if (IsKernelAddressKey(thread->GetAddressKey())) {
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MESOSPHERE_ABORT_UNLESS((this->num_kernel_waiters++) >= 0);
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}
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/* Insert the waiter. */
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this->waiter_list.insert(it, *thread);
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thread->SetLockOwner(this);
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}
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void KThread::RemoveWaiterImpl(KThread *thread) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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/* Keep track of how many kernel waiters we have. */
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if (IsKernelAddressKey(thread->GetAddressKey())) {
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MESOSPHERE_ABORT_UNLESS((this->num_kernel_waiters--) > 0);
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}
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/* Remove the waiter. */
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this->waiter_list.erase(this->waiter_list.iterator_to(*thread));
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thread->SetLockOwner(nullptr);
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}
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void KThread::RestorePriority(KThread *thread) {
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MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
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while (true) {
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/* We want to inherit priority where possible. */
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s32 new_priority = thread->GetBasePriority();
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if (thread->HasWaiters()) {
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new_priority = std::min(new_priority, thread->waiter_list.front().GetPriority());
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}
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/* If the priority we would inherit is not different from ours, don't do anything. */
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if (new_priority == thread->GetPriority()) {
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return;
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}
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/* Ensure we don't violate condition variable red black tree invariants. */
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if (auto *cond_var = thread->GetConditionVariable(); cond_var != nullptr) {
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cond_var->BeforeUpdatePriority(thread);
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}
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/* Change the priority. */
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const s32 old_priority = thread->GetPriority();
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thread->SetPriority(new_priority);
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/* Restore the condition variable, if relevant. */
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if (auto *cond_var = thread->GetConditionVariable(); cond_var != nullptr) {
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cond_var->AfterUpdatePriority(thread);
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}
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/* Update the scheduler. */
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KScheduler::OnThreadPriorityChanged(thread, old_priority);
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/* Keep the lock owner up to date. */
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KThread *lock_owner = thread->GetLockOwner();
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if (lock_owner == nullptr) {
|
|
return;
|
|
}
|
|
|
|
/* Update the thread in the lock owner's sorted list, and continue inheriting. */
|
|
lock_owner->RemoveWaiterImpl(thread);
|
|
lock_owner->AddWaiterImpl(thread);
|
|
thread = lock_owner;
|
|
}
|
|
}
|
|
|
|
void KThread::AddWaiter(KThread *thread) {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
this->AddWaiterImpl(thread);
|
|
RestorePriority(this);
|
|
}
|
|
|
|
void KThread::RemoveWaiter(KThread *thread) {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
this->RemoveWaiterImpl(thread);
|
|
RestorePriority(this);
|
|
}
|
|
|
|
KThread *KThread::RemoveWaiterByKey(s32 *out_num_waiters, KProcessAddress key) {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
|
|
|
|
s32 num_waiters = 0;
|
|
KThread *next_lock_owner = nullptr;
|
|
auto it = this->waiter_list.begin();
|
|
while (it != this->waiter_list.end()) {
|
|
if (it->GetAddressKey() == key) {
|
|
KThread *thread = std::addressof(*it);
|
|
|
|
/* Keep track of how many kernel waiters we have. */
|
|
if (IsKernelAddressKey(thread->GetAddressKey())) {
|
|
MESOSPHERE_ABORT_UNLESS((this->num_kernel_waiters--) > 0);
|
|
}
|
|
it = this->waiter_list.erase(it);
|
|
|
|
/* Update the next lock owner. */
|
|
if (next_lock_owner == nullptr) {
|
|
next_lock_owner = thread;
|
|
next_lock_owner->SetLockOwner(nullptr);
|
|
} else {
|
|
next_lock_owner->AddWaiterImpl(thread);
|
|
}
|
|
num_waiters++;
|
|
} else {
|
|
it++;
|
|
}
|
|
}
|
|
|
|
/* Do priority updates, if we have a next owner. */
|
|
if (next_lock_owner) {
|
|
RestorePriority(this);
|
|
RestorePriority(next_lock_owner);
|
|
}
|
|
|
|
/* Return output. */
|
|
*out_num_waiters = num_waiters;
|
|
return next_lock_owner;
|
|
}
|
|
|
|
Result KThread::Run() {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
|
|
/* If the kernel hasn't finished initializing, then we should suspend. */
|
|
if (Kernel::GetState() != Kernel::State::Initialized) {
|
|
this->RequestSuspend(SuspendType_Init);
|
|
}
|
|
while (true) {
|
|
KScopedSchedulerLock lk;
|
|
|
|
/* If either this thread or the current thread are requesting termination, note it. */
|
|
R_UNLESS(!this->IsTerminationRequested(), svc::ResultTerminationRequested());
|
|
R_UNLESS(!GetCurrentThread().IsTerminationRequested(), svc::ResultTerminationRequested());
|
|
|
|
/* Ensure our thread state is correct. */
|
|
R_UNLESS(this->GetState() == ThreadState_Initialized, svc::ResultInvalidState());
|
|
|
|
/* If the current thread has been asked to suspend, suspend it and retry. */
|
|
if (GetCurrentThread().IsSuspended()) {
|
|
GetCurrentThread().Suspend();
|
|
continue;
|
|
}
|
|
|
|
/* If we're not a kernel thread and we've been asked to suspend, suspend ourselves. */
|
|
if (this->IsUserThread() && this->IsSuspended()) {
|
|
this->Suspend();
|
|
}
|
|
|
|
/* Set our state and finish. */
|
|
this->SetState(KThread::ThreadState_Runnable);
|
|
return ResultSuccess();
|
|
}
|
|
}
|
|
|
|
void KThread::Exit() {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
|
|
MESOSPHERE_UNIMPLEMENTED();
|
|
|
|
MESOSPHERE_PANIC("KThread::Exit() would return");
|
|
}
|
|
|
|
void KThread::SetState(ThreadState state) {
|
|
MESOSPHERE_ASSERT_THIS();
|
|
|
|
KScopedSchedulerLock sl;
|
|
|
|
const ThreadState old_state = this->thread_state;
|
|
this->thread_state = static_cast<ThreadState>((old_state & ~ThreadState_Mask) | (state & ThreadState_Mask));
|
|
if (this->thread_state != old_state) {
|
|
KScheduler::OnThreadStateChanged(this, old_state);
|
|
}
|
|
}
|
|
|
|
KThreadContext *KThread::GetContextForSchedulerLoop() {
|
|
return std::addressof(this->GetContext());
|
|
}
|
|
|
|
}
|