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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include <atomic>
#include <memory>
#include <mutex>
#include <utility>
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/timer.h"
#include "core/hle/lock.h"
#include "core/hle/result.h"
namespace Kernel {
/**
* Callback that will wake up the thread it was scheduled for
* @param thread_handle The handle of the thread that's been awoken
* @param cycles_late The number of CPU cycles that have passed since the desired wakeup time
*/
static void ThreadWakeupCallback(u64 thread_handle, [[maybe_unused]] int cycles_late) {
const auto proper_handle = static_cast<Handle>(thread_handle);
auto& system = Core::System::GetInstance();
// Lock the global kernel mutex when we enter the kernel HLE.
std::lock_guard<std::recursive_mutex> lock(HLE::g_hle_lock);
SharedPtr<Thread> thread =
system.Kernel().RetrieveThreadFromWakeupCallbackHandleTable(proper_handle);
if (thread == nullptr) {
LOG_CRITICAL(Kernel, "Callback fired for invalid thread {:08X}", proper_handle);
return;
}
bool resume = true;
if (thread->status == ThreadStatus::WaitSynchAny ||
thread->status == ThreadStatus::WaitSynchAll ||
thread->status == ThreadStatus::WaitHLEEvent) {
// Remove the thread from each of its waiting objects' waitlists
for (auto& object : thread->wait_objects) {
object->RemoveWaitingThread(thread.get());
}
thread->wait_objects.clear();
// Invoke the wakeup callback before clearing the wait objects
if (thread->wakeup_callback) {
resume = thread->wakeup_callback(ThreadWakeupReason::Timeout, thread, nullptr, 0);
}
}
if (thread->mutex_wait_address != 0 || thread->condvar_wait_address != 0 ||
thread->wait_handle) {
ASSERT(thread->status == ThreadStatus::WaitMutex);
thread->mutex_wait_address = 0;
thread->condvar_wait_address = 0;
thread->wait_handle = 0;
auto lock_owner = thread->lock_owner;
// Threads waking up by timeout from WaitProcessWideKey do not perform priority inheritance
// and don't have a lock owner unless SignalProcessWideKey was called first and the thread
// wasn't awakened due to the mutex already being acquired.
if (lock_owner) {
lock_owner->RemoveMutexWaiter(thread);
}
}
if (thread->arb_wait_address != 0) {
ASSERT(thread->status == ThreadStatus::WaitArb);
thread->arb_wait_address = 0;
}
if (resume) {
thread->ResumeFromWait();
}
}
/// The timer callback event, called when a timer is fired
static void TimerCallback(u64 timer_handle, int cycles_late) {
const auto proper_handle = static_cast<Handle>(timer_handle);
auto& system = Core::System::GetInstance();
SharedPtr<Timer> timer = system.Kernel().RetrieveTimerFromCallbackHandleTable(proper_handle);
if (timer == nullptr) {
LOG_CRITICAL(Kernel, "Callback fired for invalid timer {:016X}", timer_handle);
return;
}
timer->Signal(cycles_late);
}
struct KernelCore::Impl {
void Initialize(KernelCore& kernel) {
Shutdown();
InitializeResourceLimits(kernel);
InitializeThreads();
InitializeTimers();
}
void Shutdown() {
next_object_id = 0;
next_process_id = 10;
next_thread_id = 1;
process_list.clear();
handle_table.Clear();
resource_limits.fill(nullptr);
thread_wakeup_callback_handle_table.Clear();
thread_wakeup_event_type = nullptr;
timer_callback_handle_table.Clear();
timer_callback_event_type = nullptr;
}
void InitializeResourceLimits(KernelCore& kernel) {
// Create the four resource limits that the system uses
// Create the APPLICATION resource limit
SharedPtr<ResourceLimit> resource_limit = ResourceLimit::Create(kernel, "Applications");
resource_limit->max_priority = 0x18;
resource_limit->max_commit = 0x4000000;
resource_limit->max_threads = 0x20;
resource_limit->max_events = 0x20;
resource_limit->max_mutexes = 0x20;
resource_limit->max_semaphores = 0x8;
resource_limit->max_timers = 0x8;
resource_limit->max_shared_mems = 0x10;
resource_limit->max_address_arbiters = 0x2;
resource_limit->max_cpu_time = 0x1E;
resource_limits[static_cast<u8>(ResourceLimitCategory::APPLICATION)] = resource_limit;
// Create the SYS_APPLET resource limit
resource_limit = ResourceLimit::Create(kernel, "System Applets");
resource_limit->max_priority = 0x4;
resource_limit->max_commit = 0x5E00000;
resource_limit->max_threads = 0x1D;
resource_limit->max_events = 0xB;
resource_limit->max_mutexes = 0x8;
resource_limit->max_semaphores = 0x4;
resource_limit->max_timers = 0x4;
resource_limit->max_shared_mems = 0x8;
resource_limit->max_address_arbiters = 0x3;
resource_limit->max_cpu_time = 0x2710;
resource_limits[static_cast<u8>(ResourceLimitCategory::SYS_APPLET)] = resource_limit;
// Create the LIB_APPLET resource limit
resource_limit = ResourceLimit::Create(kernel, "Library Applets");
resource_limit->max_priority = 0x4;
resource_limit->max_commit = 0x600000;
resource_limit->max_threads = 0xE;
resource_limit->max_events = 0x8;
resource_limit->max_mutexes = 0x8;
resource_limit->max_semaphores = 0x4;
resource_limit->max_timers = 0x4;
resource_limit->max_shared_mems = 0x8;
resource_limit->max_address_arbiters = 0x1;
resource_limit->max_cpu_time = 0x2710;
resource_limits[static_cast<u8>(ResourceLimitCategory::LIB_APPLET)] = resource_limit;
// Create the OTHER resource limit
resource_limit = ResourceLimit::Create(kernel, "Others");
resource_limit->max_priority = 0x4;
resource_limit->max_commit = 0x2180000;
resource_limit->max_threads = 0xE1;
resource_limit->max_events = 0x108;
resource_limit->max_mutexes = 0x25;
resource_limit->max_semaphores = 0x43;
resource_limit->max_timers = 0x2C;
resource_limit->max_shared_mems = 0x1F;
resource_limit->max_address_arbiters = 0x2D;
resource_limit->max_cpu_time = 0x3E8;
resource_limits[static_cast<u8>(ResourceLimitCategory::OTHER)] = resource_limit;
}
void InitializeThreads() {
thread_wakeup_event_type =
CoreTiming::RegisterEvent("ThreadWakeupCallback", ThreadWakeupCallback);
}
void InitializeTimers() {
timer_callback_handle_table.Clear();
timer_callback_event_type = CoreTiming::RegisterEvent("TimerCallback", TimerCallback);
}
std::atomic<u32> next_object_id{0};
// TODO(Subv): Start the process ids from 10 for now, as lower PIDs are
// reserved for low-level services
std::atomic<u32> next_process_id{10};
std::atomic<u32> next_thread_id{1};
// Lists all processes that exist in the current session.
std::vector<SharedPtr<Process>> process_list;
Kernel::HandleTable handle_table;
std::array<SharedPtr<ResourceLimit>, 4> resource_limits;
/// The event type of the generic timer callback event
CoreTiming::EventType* timer_callback_event_type = nullptr;
// TODO(yuriks): This can be removed if Timer objects are explicitly pooled in the future,
// allowing us to simply use a pool index or similar.
Kernel::HandleTable timer_callback_handle_table;
CoreTiming::EventType* thread_wakeup_event_type = nullptr;
// TODO(yuriks): This can be removed if Thread objects are explicitly pooled in the future,
// allowing us to simply use a pool index or similar.
Kernel::HandleTable thread_wakeup_callback_handle_table;
};
KernelCore::KernelCore() : impl{std::make_unique<Impl>()} {}
KernelCore::~KernelCore() {
Shutdown();
}
void KernelCore::Initialize() {
impl->Initialize(*this);
}
void KernelCore::Shutdown() {
impl->Shutdown();
}
Kernel::HandleTable& KernelCore::HandleTable() {
return impl->handle_table;
}
const Kernel::HandleTable& KernelCore::HandleTable() const {
return impl->handle_table;
}
SharedPtr<ResourceLimit> KernelCore::ResourceLimitForCategory(
ResourceLimitCategory category) const {
return impl->resource_limits.at(static_cast<std::size_t>(category));
}
SharedPtr<Thread> KernelCore::RetrieveThreadFromWakeupCallbackHandleTable(Handle handle) const {
return impl->thread_wakeup_callback_handle_table.Get<Thread>(handle);
}
SharedPtr<Timer> KernelCore::RetrieveTimerFromCallbackHandleTable(Handle handle) const {
return impl->timer_callback_handle_table.Get<Timer>(handle);
}
void KernelCore::AppendNewProcess(SharedPtr<Process> process) {
impl->process_list.push_back(std::move(process));
}
u32 KernelCore::CreateNewObjectID() {
return impl->next_object_id++;
}
u32 KernelCore::CreateNewThreadID() {
return impl->next_thread_id++;
}
u32 KernelCore::CreateNewProcessID() {
return impl->next_process_id++;
}
ResultVal<Handle> KernelCore::CreateTimerCallbackHandle(const SharedPtr<Timer>& timer) {
return impl->timer_callback_handle_table.Create(timer);
}
CoreTiming::EventType* KernelCore::ThreadWakeupCallbackEventType() const {
return impl->thread_wakeup_event_type;
}
CoreTiming::EventType* KernelCore::TimerCallbackEventType() const {
return impl->timer_callback_event_type;
}
Kernel::HandleTable& KernelCore::ThreadWakeupCallbackHandleTable() {
return impl->thread_wakeup_callback_handle_table;
}
const Kernel::HandleTable& KernelCore::ThreadWakeupCallbackHandleTable() const {
return impl->thread_wakeup_callback_handle_table;
}
} // namespace Kernel
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