Add 2 new syscalls (sys_version, sys_gettid)

kernel/include/sys/Syscall.h

@@ -8,6 +8,8 @@
 #define SYS_write 3
 #define SYS_paint 4
 #define SYS_rand 5
+#define SYS_version 6
+#define SYS_gettid 7
 
 namespace Syscall
 {
@@ -19,4 +21,6 @@ void sys_yield(Context* context);
 void sys_sleep(Context* context, uint64_t ms);
 void sys_write(Context* context, const char* addr, size_t size);
 void sys_paint(Context* context, uint64_t x, uint64_t y, uint64_t w, uint64_t h, uint64_t col);
-void sys_rand(Context* context);
+void sys_rand(Context* context);
+void sys_version(Context* context, char* buffer, size_t max);
+void sys_gettid(Context* context);

kernel/src/sys/Syscall.cpp

@@ -21,6 +21,8 @@ void Syscall::entry(Context* context)
         break;
     case SYS_paint: sys_paint(context, context->rdi, context->rsi, context->r10, context->r8, context->r9); break;
     case SYS_rand: sys_rand(context); break;
+    case SYS_version: sys_version(context, (char*)context->rdi, context->rsi); break;
+    case SYS_gettid: sys_gettid(context); break;
     default: context->rax = -1; break;
     }
 }

kernel/src/sys/sched.cpp

@@ -18,4 +18,9 @@ void sys_sleep(Context* context, uint64_t ms)
     task->task_sleep = ms;
     task->state = task->Sleeping;
     Scheduler::task_yield(context);
+}
+
+void sys_gettid(Context* context)
+{
+    context->rax = Scheduler::current_task()->id;
 }

kernel/src/sys/version.cpp

@@ -0,0 +1,8 @@
+#include "config.h"
+#include "interrupts/Context.h"
+#include "std/stdio.h"
+
+void sys_version(Context* context, char* buffer, size_t max)
+{
+    context->rax = snprintf(buffer, max, "moon %s", moon_version());
+}