mirror of
https://github.com/PabloMK7/citra.git
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330 lines
9.6 KiB
C++
330 lines
9.6 KiB
C++
// Copyright 2014 Citra Emulator Project / PPSSPP Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include <stdio.h>
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#include <list>
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#include <vector>
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#include <map>
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#include <string>
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#include "common/common.h"
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#include "common/thread_queue_list.h"
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#include "core/core.h"
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#include "core/mem_map.h"
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#include "core/hle/hle.h"
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#include "core/hle/syscall.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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// Enums
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enum ThreadPriority {
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THREADPRIO_HIGHEST = 0,
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THREADPRIO_DEFAULT = 16,
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THREADPRIO_LOWEST = 31,
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};
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enum ThreadStatus {
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THREADSTATUS_RUNNING = 1,
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THREADSTATUS_READY = 2,
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THREADSTATUS_WAIT = 4,
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THREADSTATUS_SUSPEND = 8,
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THREADSTATUS_DORMANT = 16,
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THREADSTATUS_DEAD = 32,
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THREADSTATUS_WAITSUSPEND = THREADSTATUS_WAIT | THREADSTATUS_SUSPEND
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};
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enum WaitType {
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WAITTYPE_NONE,
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WAITTYPE_SLEEP,
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WAITTYPE_SEMA,
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WAITTYPE_EVENTFLAG,
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WAITTYPE_THREADEND,
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WAITTYPE_VBLANK,
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WAITTYPE_MUTEX,
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WAITTYPE_SYNCH,
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NUM_WAITTYPES
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};
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typedef s32 Handle;
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class Thread : public KernelObject {
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public:
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const char *GetName() { return name; }
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const char *GetTypeName() { return "Thread"; }
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static KernelIDType GetStaticIDType() { return KERNEL_ID_TYPE_THREAD; }
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KernelIDType GetIDType() const { return KERNEL_ID_TYPE_THREAD; }
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inline bool IsRunning() const { return (status & THREADSTATUS_RUNNING) != 0; }
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inline bool IsStopped() const { return (status & THREADSTATUS_DORMANT) != 0; }
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inline bool IsReady() const { return (status & THREADSTATUS_READY) != 0; }
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inline bool IsWaiting() const { return (status & THREADSTATUS_WAIT) != 0; }
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inline bool IsSuspended() const { return (status & THREADSTATUS_SUSPEND) != 0; }
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ThreadContext context;
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u32 status;
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u32 entry_point;
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u32 stack_top;
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u32 stack_size;
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s32 initial_priority;
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s32 current_priority;
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s32 processor_id;
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WaitType wait_type;
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char name[KERNEL_MAX_NAME_LENGTH+1];
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};
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// Lists all thread ids that aren't deleted/etc.
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std::vector<Handle> g_thread_queue;
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// Lists only ready thread ids.
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Common::ThreadQueueList<Handle> g_thread_ready_queue;
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Handle g_current_thread_handle;
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Thread* g_current_thread;
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inline Thread *__GetCurrentThread() {
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return g_current_thread;
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}
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inline void __SetCurrentThread(Thread *t) {
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g_current_thread = t;
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g_current_thread_handle = t->GetHandle();
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Saves the current CPU context
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void __KernelSaveContext(ThreadContext &ctx) {
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ctx.cpu_registers[0] = Core::g_app_core->GetReg(0);
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ctx.cpu_registers[1] = Core::g_app_core->GetReg(1);
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ctx.cpu_registers[2] = Core::g_app_core->GetReg(2);
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ctx.cpu_registers[3] = Core::g_app_core->GetReg(3);
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ctx.cpu_registers[4] = Core::g_app_core->GetReg(4);
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ctx.cpu_registers[5] = Core::g_app_core->GetReg(5);
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ctx.cpu_registers[6] = Core::g_app_core->GetReg(6);
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ctx.cpu_registers[7] = Core::g_app_core->GetReg(7);
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ctx.cpu_registers[8] = Core::g_app_core->GetReg(8);
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ctx.cpu_registers[9] = Core::g_app_core->GetReg(9);
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ctx.cpu_registers[10] = Core::g_app_core->GetReg(10);
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ctx.cpu_registers[11] = Core::g_app_core->GetReg(11);
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ctx.cpu_registers[12] = Core::g_app_core->GetReg(12);
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ctx.sp = Core::g_app_core->GetReg(13);
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ctx.lr = Core::g_app_core->GetReg(14);
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ctx.pc = Core::g_app_core->GetPC();
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ctx.cpsr = Core::g_app_core->GetCPSR();
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}
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/// Loads a CPU context
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void __KernelLoadContext(const ThreadContext &ctx) {
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Core::g_app_core->SetReg(0, ctx.cpu_registers[0]);
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Core::g_app_core->SetReg(1, ctx.cpu_registers[1]);
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Core::g_app_core->SetReg(2, ctx.cpu_registers[2]);
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Core::g_app_core->SetReg(3, ctx.cpu_registers[3]);
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Core::g_app_core->SetReg(4, ctx.cpu_registers[4]);
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Core::g_app_core->SetReg(5, ctx.cpu_registers[5]);
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Core::g_app_core->SetReg(6, ctx.cpu_registers[6]);
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Core::g_app_core->SetReg(7, ctx.cpu_registers[7]);
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Core::g_app_core->SetReg(8, ctx.cpu_registers[8]);
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Core::g_app_core->SetReg(9, ctx.cpu_registers[9]);
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Core::g_app_core->SetReg(10, ctx.cpu_registers[10]);
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Core::g_app_core->SetReg(11, ctx.cpu_registers[11]);
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Core::g_app_core->SetReg(12, ctx.cpu_registers[12]);
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Core::g_app_core->SetReg(13, ctx.sp);
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Core::g_app_core->SetReg(14, ctx.lr);
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//Core::g_app_core->SetReg(15, ctx.pc);
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Core::g_app_core->SetPC(ctx.pc);
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Core::g_app_core->SetCPSR(ctx.cpsr);
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}
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/// Resets a thread
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void __KernelResetThread(Thread *t, s32 lowest_priority) {
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memset(&t->context, 0, sizeof(ThreadContext));
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t->context.pc = t->entry_point;
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t->context.sp = t->stack_top;
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if (t->current_priority < lowest_priority) {
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t->current_priority = t->initial_priority;
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}
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t->wait_type = WAITTYPE_NONE;
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}
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/// Creates a new thread
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Thread *__KernelCreateThread(Handle &handle, const char *name, u32 entry_point, s32 priority,
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s32 processor_id, u32 stack_top, int stack_size) {
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static u32 _handle_count = 1;
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Thread *t = new Thread;
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handle = (_handle_count++);
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g_thread_queue.push_back(handle);
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g_thread_ready_queue.prepare(priority);
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t->status = THREADSTATUS_DORMANT;
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t->entry_point = entry_point;
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t->stack_top = stack_top;
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t->stack_size = stack_size;
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t->initial_priority = t->current_priority = priority;
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t->processor_id = processor_id;
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t->wait_type = WAITTYPE_NONE;
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strncpy(t->name, name, KERNEL_MAX_NAME_LENGTH);
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t->name[KERNEL_MAX_NAME_LENGTH] = '\0';
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return t;
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}
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/// Change a thread to "ready" state
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void __KernelChangeReadyState(Thread *t, bool ready) {
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Handle handle = t->GetHandle();
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if (t->IsReady()) {
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if (!ready) {
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g_thread_ready_queue.remove(t->current_priority, handle);
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}
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} else if (ready) {
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if (t->IsRunning()) {
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g_thread_ready_queue.push_front(t->current_priority, handle);
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} else {
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g_thread_ready_queue.push_back(t->current_priority, handle);
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}
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t->status = THREADSTATUS_READY;
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}
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}
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/// Changes a threads state
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void __KernelChangeThreadState(Thread *t, ThreadStatus new_status) {
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if (!t || t->status == new_status) {
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return;
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}
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__KernelChangeReadyState(t, (new_status & THREADSTATUS_READY) != 0);
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t->status = new_status;
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if (new_status == THREADSTATUS_WAIT) {
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if (t->wait_type == WAITTYPE_NONE) {
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printf("ERROR: Waittype none not allowed here\n");
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}
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}
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}
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/// Switches CPU context to that of the specified thread
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void __KernelSwitchContext(Thread* t, const char *reason) {
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Thread *cur = __GetCurrentThread();
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// Save context for current thread
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if (cur) {
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__KernelSaveContext(cur->context);
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if (cur->IsRunning()) {
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__KernelChangeReadyState(cur, true);
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}
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}
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// Load context of new thread
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if (t) {
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__SetCurrentThread(t);
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__KernelChangeReadyState(t, false);
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t->status = (t->status | THREADSTATUS_RUNNING) & ~THREADSTATUS_READY;
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t->wait_type = WAITTYPE_NONE;
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__KernelLoadContext(t->context);
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} else {
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__SetCurrentThread(NULL);
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}
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}
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/// Gets the next thread that is ready to be run by priority
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Thread *__KernelNextThread() {
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Handle next;
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Thread *cur = __GetCurrentThread();
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if (cur && cur->IsRunning()) {
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next = g_thread_ready_queue.pop_first_better(cur->current_priority);
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} else {
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next = g_thread_ready_queue.pop_first();
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}
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if (next < 0) {
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return NULL;
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}
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return g_kernel_objects.GetFast<Thread>(next);
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}
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/// Calls a thread by marking it as "ready" (note: will not actually execute until current thread yields)
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void __KernelCallThread(Thread *t) {
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// Stop waiting
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if (t->wait_type != WAITTYPE_NONE) {
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t->wait_type = WAITTYPE_NONE;
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}
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__KernelChangeThreadState(t, THREADSTATUS_READY);
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}
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/// Sets up the primary application thread
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Handle __KernelSetupMainThread(s32 priority, int stack_size) {
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Handle handle;
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// Initialize new "main" thread
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Thread *t = __KernelCreateThread(handle, "main", Core::g_app_core->GetPC(), priority,
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0xFFFFFFFE, Memory::SCRATCHPAD_VADDR_END, stack_size);
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__KernelResetThread(t, 0);
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// If running another thread already, set it to "ready" state
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Thread *cur = __GetCurrentThread();
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if (cur && cur->IsRunning()) {
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__KernelChangeReadyState(cur, true);
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}
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// Run new "main" thread
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__SetCurrentThread(t);
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t->status = THREADSTATUS_RUNNING;
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__KernelLoadContext(t->context);
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return handle;
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}
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/// Resumes a thread from waiting by marking it as "ready"
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void __KernelResumeThreadFromWait(Handle handle) {
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u32 error;
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Thread *t = g_kernel_objects.Get<Thread>(handle, error);
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if (t) {
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t->status &= ~THREADSTATUS_WAIT;
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if (!(t->status & (THREADSTATUS_WAITSUSPEND | THREADSTATUS_DORMANT | THREADSTATUS_DEAD))) {
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__KernelChangeReadyState(t, true);
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}
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}
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}
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/// Puts a thread in the wait state for the given type/reason
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void __KernelWaitCurThread(WaitType wait_type, const char *reason) {
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Thread *t = __GetCurrentThread();
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t->wait_type = wait_type;
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__KernelChangeThreadState(t, ThreadStatus(THREADSTATUS_WAIT | (t->status & THREADSTATUS_SUSPEND)));
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}
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/// Reschedules to the next available thread (call after current thread is suspended)
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void __KernelReschedule(const char *reason) {
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Thread *next = __KernelNextThread();
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if (next > 0) {
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__KernelSwitchContext(next, reason);
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}
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}
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void __KernelThreadingInit() {
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}
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void __KernelThreadingShutdown() {
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}
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