From cbefe3c2d05f48ac4f0f8338081b96de12e0dcd2 Mon Sep 17 00:00:00 2001
From: wheremyfoodat <gponiris2004@gmail.com>
Date: Wed, 21 Sep 2022 00:48:51 +0300
Subject: [PATCH] [Kernel] Implement GetSystemTick

---
 include/cpu_dynarmic.hpp      |  7 +++++++
 include/kernel/kernel.hpp     |  1 +
 src/core/CPU/cpu_dynarmic.cpp |  1 +
 src/core/kernel/kernel.cpp    | 10 ++++++++++
 4 files changed, 19 insertions(+)

diff --git a/include/cpu_dynarmic.hpp b/include/cpu_dynarmic.hpp
index 87a61ebc..0cabbd0e 100644
--- a/include/cpu_dynarmic.hpp
+++ b/include/cpu_dynarmic.hpp
@@ -13,6 +13,7 @@ class CPU;
 class MyEnvironment final : public Dynarmic::A32::UserCallbacks {
 public:
     u64 ticksLeft = 0;
+    u64 totalTicks = 0;
     Memory& mem;
     Kernel& kernel;
 
@@ -80,6 +81,8 @@ public:
     }
 
     void AddTicks(u64 ticks) override {
+        totalTicks += ticks;
+
         if (ticks > ticksLeft) {
             ticksLeft = 0;
             return;
@@ -148,6 +151,10 @@ public:
         cp15->setTLSBase(value);
     }
 
+    u64 getTicks() {
+        return env.totalTicks;
+    }
+
     void runFrame() {
         env.ticksLeft = 268111856 / 60;
         const auto exitReason = jit->Run();
diff --git a/include/kernel/kernel.hpp b/include/kernel/kernel.hpp
index 502d812b..39c6e08f 100644
--- a/include/kernel/kernel.hpp
+++ b/include/kernel/kernel.hpp
@@ -92,6 +92,7 @@ class Kernel {
 	void getResourceLimit();
 	void getResourceLimitLimitValues();
 	void getResourceLimitCurrentValues();
+	void getSystemTick();
 	void sendSyncRequest();
 	void svcCloseHandle();
 	void connectToPort();
diff --git a/src/core/CPU/cpu_dynarmic.cpp b/src/core/CPU/cpu_dynarmic.cpp
index c1a4f526..9092b7a3 100644
--- a/src/core/CPU/cpu_dynarmic.cpp
+++ b/src/core/CPU/cpu_dynarmic.cpp
@@ -19,6 +19,7 @@ CPU::CPU(Memory& mem, Kernel& kernel) : mem(mem), env(mem, kernel, *this) {
 void CPU::reset() {
     setCPSR(CPSR::UserMode);
     setFPSCR(FPSCR::ThreadDefault);
+    env.totalTicks = 0;
 
     cp15->reset();
     cp15->setTLSBase(VirtualAddrs::TLSBase); // Set cp15 TLS pointer to the main thread's thread-local storage
diff --git a/src/core/kernel/kernel.cpp b/src/core/kernel/kernel.cpp
index 5f5ca72e..9a1cc09b 100644
--- a/src/core/kernel/kernel.cpp
+++ b/src/core/kernel/kernel.cpp
@@ -26,6 +26,7 @@ void Kernel::serviceSVC(u32 svc) {
 		case 0x22: arbitrateAddress(); break;
 		case 0x23: svcCloseHandle(); break;
 		case 0x24: waitSynchronization1(); break;
+		case 0x28: getSystemTick(); break;
 		case 0x2D: connectToPort(); break;
 		case 0x32: sendSyncRequest(); break;
 		case 0x38: getResourceLimit(); break;
@@ -108,6 +109,15 @@ void Kernel::svcCloseHandle() {
 	regs[0] = SVCResult::Success;
 }
 
+// u64 GetSystemTick()
+void Kernel::getSystemTick() {
+	printf("GetSystemTick()\n");
+
+	u64 ticks = cpu.getTicks();
+	regs[0] = u32(ticks);
+	regs[1] = u32(ticks >> 32);
+}
+
 // Result OutputDebugString(const char* str, s32 size)
 // TODO: Does this actually write an error code in r0 and is the above signature correct?
 void Kernel::outputDebugString() {