From 62a2bcf2ff44ff7522887db87b9d5bb6844f33f7 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sat, 15 Oct 2022 13:17:26 +0200
Subject: [PATCH] Kernel: Add a clock() system call

---
 kernel/include/sys/Syscall.h | 4 +++-
 kernel/src/sys/Syscall.cpp   | 1 +
 kernel/src/sys/clock.cpp     | 9 +++++++++
 3 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 kernel/src/sys/clock.cpp

diff --git a/kernel/include/sys/Syscall.h b/kernel/include/sys/Syscall.h
index c0955388..e92a795f 100644
--- a/kernel/include/sys/Syscall.h
+++ b/kernel/include/sys/Syscall.h
@@ -17,6 +17,7 @@
 #define SYS_exec 12
 #define SYS_fcntl 13
 #define SYS_mprotect 14
+#define SYS_clock 15
 
 namespace Syscall
 {
@@ -39,4 +40,5 @@ void sys_close(Context* context, int fd);
 void sys_seek(Context* context, int fd, long offset, int whence);
 void sys_exec(Context* context, const char* pathname);
 void sys_fcntl(Context* context, int fd, int command, uintptr_t arg);
-void sys_mprotect(Context* context, void* address, size_t size, int prot);
\ No newline at end of file
+void sys_mprotect(Context* context, void* address, size_t size, int prot);
+void sys_clock(Context* context);
\ No newline at end of file
diff --git a/kernel/src/sys/Syscall.cpp b/kernel/src/sys/Syscall.cpp
index 4369f6a3..243756ed 100644
--- a/kernel/src/sys/Syscall.cpp
+++ b/kernel/src/sys/Syscall.cpp
@@ -26,6 +26,7 @@ void Syscall::entry(Context* context)
     case SYS_exec: sys_exec(context, (const char*)context->rdi); break;
     case SYS_fcntl: sys_fcntl(context, (int)context->rdi, (int)context->rsi, context->rdx); break;
     case SYS_mprotect: sys_mprotect(context, (void*)context->rdi, context->rsi, (int)context->rdx); break;
+    case SYS_clock: sys_clock(context); break;
     default: context->rax = -ENOSYS; break;
     }
     VMM::exit_syscall_context();
diff --git a/kernel/src/sys/clock.cpp b/kernel/src/sys/clock.cpp
new file mode 100644
index 00000000..81123aae
--- /dev/null
+++ b/kernel/src/sys/clock.cpp
@@ -0,0 +1,9 @@
+#include "interrupts/Context.h"
+#include "thread/Scheduler.h"
+
+void sys_clock(Context* context)
+{
+    Task* current_task = Scheduler::current_task();
+    context->rax = (long)current_task->cpu_time;
+    return;
+}
\ No newline at end of file