diff --git a/include/syscall.h b/include/syscall.h
index 05752ba..3791a92 100644
--- a/include/syscall.h
+++ b/include/syscall.h
@@ -30,6 +30,7 @@ int OSReadDir(uint64_t fd, char *buf, size_t length, uint64_t *offset);
 
 // Threads
 int OSThreadCreate(uint64_t rip, uint64_t arg);
+int OSGetTID();
 int OSThreadExit(uint64_t status);
 int OSThreadSleep(uint64_t time);
 int OSThreadWait(uint64_t tid);
diff --git a/lib/libc/syscall.c b/lib/libc/syscall.c
index 40e9905..d9c669e 100644
--- a/lib/libc/syscall.c
+++ b/lib/libc/syscall.c
@@ -103,6 +103,12 @@ OSThreadCreate(uint64_t rip, uint64_t arg)
     return syscall(SYSCALL_THREADCREATE, rip, arg);
 }
 
+int
+OSGetTID()
+{
+    return syscall(SYSCALL_GETTID);
+}
+
 int
 OSThreadExit(uint64_t status)
 {
diff --git a/sys/include/syscall.h b/sys/include/syscall.h
index b012a84..a2d27a5 100644
--- a/sys/include/syscall.h
+++ b/sys/include/syscall.h
@@ -30,9 +30,10 @@
 
 // Threading
 #define SYSCALL_THREADCREATE	0x30
-#define SYSCALL_THREADEXIT	0x31
-#define SYSCALL_THREADSLEEP	0x32
-#define SYSCALL_THREADWAIT	0x33
+#define SYSCALL_GETTID		0x31
+#define SYSCALL_THREADEXIT	0x32
+#define SYSCALL_THREADSLEEP	0x33
+#define SYSCALL_THREADWAIT	0x34
 
 // Network
 #define SYSCALL_NICSTAT		0x40
diff --git a/sys/kern/syscall.c b/sys/kern/syscall.c
index 4c3057e..d8fcc71 100644
--- a/sys/kern/syscall.c
+++ b/sys/kern/syscall.c
@@ -139,10 +139,9 @@ uint64_t
 Syscall_MMap(uint64_t addr, uint64_t len, uint64_t prot)
 {
     Thread *cur = Sched_Current();
-    uint64_t pgs = (len + PGSIZE - 1) / PGSIZE;
     bool status;
 
-    status = PMap_AllocMap(cur->space, addr, pgs, PTE_W);
+    status = PMap_AllocMap(cur->space, addr, len, PTE_W);
     Thread_Release(cur);
     if (!status) {
 	// XXX: Need to unmap PMap_Unmap(cur->space, addr, pgs);
@@ -375,6 +374,17 @@ Syscall_ThreadCreate(uint64_t rip, uint64_t arg)
     return threadId;
 }
 
+uint64_t
+Syscall_GetTID()
+{
+    Thread *cur = Sched_Current();
+    uint64_t tid = cur->tid;
+
+    Thread_Release(cur);
+
+    return tid;
+}
+
 void
 Syscall_ThreadExit(uint64_t status)
 {
@@ -562,6 +572,8 @@ Syscall_Entry(uint64_t syscall, uint64_t a1, uint64_t a2,
 	    return Syscall_ReadDir(a1, (char *)a2, a3, a4);
 	case SYSCALL_THREADCREATE:
 	    return Syscall_ThreadCreate(a1, a2);
+	case SYSCALL_GETTID:
+	    return Syscall_GetTID();
 	case SYSCALL_THREADEXIT:
 	    Syscall_ThreadExit(a1);
 	    return 0;