7e2903cb74
This handle manager more closely mirrors the behaviour of the CTR-OS one. In addition object ref-counts and support for DuplicateHandle have been added. Note that support for DuplicateHandle is still experimental, since parts of the kernel still use Handles internally, which will likely cause troubles if two different handles to the same object are used to e.g. wait on a synchronization primitive.
131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include "common/common.h"
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#include "core/core.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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Handle g_main_thread = 0;
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HandleTable g_handle_table;
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u64 g_program_id = 0;
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HandleTable::HandleTable() {
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next_generation = 1;
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Clear();
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}
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ResultVal<Handle> HandleTable::Create(Object* obj) {
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_dbg_assert_(Kernel, obj != nullptr);
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u16 slot = next_free_slot;
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if (slot >= generations.size()) {
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LOG_ERROR(Kernel, "Unable to allocate Handle, too many slots in use.");
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return ERR_OUT_OF_HANDLES;
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}
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next_free_slot = generations[slot];
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u16 generation = next_generation++;
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// Overflow count so it fits in the 15 bits dedicated to the generation in the handle.
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// CTR-OS doesn't use generation 0, so skip straight to 1.
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if (next_generation >= (1 << 15)) next_generation = 1;
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generations[slot] = generation;
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intrusive_ptr_add_ref(obj);
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objects[slot] = obj;
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Handle handle = generation | (slot << 15);
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obj->handle = handle;
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return MakeResult<Handle>(handle);
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}
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ResultVal<Handle> HandleTable::Duplicate(Handle handle) {
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Object* object = GetGeneric(handle);
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if (object == nullptr) {
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LOG_ERROR(Kernel, "Tried to duplicate invalid handle: %08X", handle);
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return ERR_INVALID_HANDLE;
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}
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return Create(object);
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}
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ResultCode HandleTable::Close(Handle handle) {
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if (!IsValid(handle))
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return ERR_INVALID_HANDLE;
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size_t slot = GetSlot(handle);
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u16 generation = GetGeneration(handle);
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intrusive_ptr_release(objects[slot]);
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objects[slot] = nullptr;
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generations[generation] = next_free_slot;
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next_free_slot = slot;
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return RESULT_SUCCESS;
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}
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bool HandleTable::IsValid(Handle handle) const {
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size_t slot = GetSlot(handle);
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u16 generation = GetGeneration(handle);
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return slot < MAX_COUNT && objects[slot] != nullptr && generations[slot] == generation;
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}
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Object* HandleTable::GetGeneric(Handle handle) const {
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if (handle == CurrentThread) {
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// TODO(yuriks) Directly return the pointer once this is possible.
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handle = GetCurrentThreadHandle();
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} else if (handle == CurrentProcess) {
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LOG_ERROR(Kernel, "Current process (%08X) pseudo-handle not supported", CurrentProcess);
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return nullptr;
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}
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if (!IsValid(handle)) {
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return nullptr;
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}
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return objects[GetSlot(handle)];
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}
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void HandleTable::Clear() {
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for (size_t i = 0; i < MAX_COUNT; ++i) {
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generations[i] = i + 1;
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if (objects[i] != nullptr)
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intrusive_ptr_release(objects[i]);
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objects[i] = nullptr;
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}
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next_free_slot = 0;
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}
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/// Initialize the kernel
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void Init() {
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Kernel::ThreadingInit();
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}
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/// Shutdown the kernel
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void Shutdown() {
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Kernel::ThreadingShutdown();
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g_handle_table.Clear(); // Free all kernel objects
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}
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/**
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* Loads executable stored at specified address
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* @entry_point Entry point in memory of loaded executable
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* @return True on success, otherwise false
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*/
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bool LoadExec(u32 entry_point) {
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Core::g_app_core->SetPC(entry_point);
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// 0x30 is the typical main thread priority I've seen used so far
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g_main_thread = Kernel::SetupMainThread(0x30);
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return true;
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}
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} // namespace
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