diff --git a/src/chkreg/Makefile b/src/chkreg/Makefile
index c4bb6dc..14b395a 100644
--- a/src/chkreg/Makefile
+++ b/src/chkreg/Makefile
@@ -6,6 +6,6 @@ OBJS = chkreg.o
 
 #DEBUG = 1
 
-LIBS = -lThreadManForKernel -lsceIdStorage_driver -lpspsemaphore
+LIBS = -lsceIdStorage_driver -lThreadManForKernel -lpspsemaphore
 
 include ../../lib/build.mak
diff --git a/src/chkreg/chkreg.c b/src/chkreg/chkreg.c
index f549ded..5ed0917 100644
--- a/src/chkreg/chkreg.c
+++ b/src/chkreg/chkreg.c
@@ -1,22 +1,41 @@
 #include <common_imp.h>
+#include <threadman_kernel.h>
 
 SCE_MODULE_INFO("sceChkreg", SCE_MODULE_KERNEL | SCE_MODULE_KIRK_SEMAPHORE_LIB | SCE_MODULE_ATTR_EXCLUSIVE_LOAD
                               | SCE_MODULE_ATTR_EXCLUSIVE_START, 1, 9);
 SCE_SDK_VERSION(SDK_VERSION);
 
+typedef struct {
+    SceUID sema;
+} g_chkreg_struct;
+
+g_chkreg_struct g_chkreg = {0};
+
+// Declarations
+s32 sceIdStorageReadLeaf(u16 key, void *buf);
+s32 sceIdStorageLookup(u16 key, u32 offset, void *buf, u32 len);
+s32 sceUtilsBufferCopyWithRange(void* outBuf, s32 outsize, void* inBuf, s32 insize, s32 cmd);
+
+s32 sub_00000000(void)
+{
+    return 0;
+}
+
+s32 sub_00000128(s32 unk1, s32 unk2)
+{
+    return 0;
+}
+
 // Subroutine sub_00000190 - Address 0x00000190 
 s32 sub_00000190(void)
 {
-    s32 ret = SCE_ERROR_OK;
-    ret = sceIdStorageLookup(0x100, 0x38, 0xa80, 0xb8);
-    if (ret < 0)
-        return SCE_ERROR_NOT_FOUND;
-    
-    ret = sceIdStorageLookup(0x120, 0x38, 0xa80, 0xb8);
-    if (ret < 0)
+    if (sceIdStorageLookup(0x100, 0x38, 0xa80, 0xb8) < 0)
         return SCE_ERROR_NOT_FOUND;
         
-    return ret;
+    if (sceIdStorageLookup(0x120, 0x38, 0xa80, 0xb8) < 0)
+        return SCE_ERROR_NOT_FOUND;
+        
+    return SCE_ERROR_OK;
 }
 
 // Subroutine sub_0000020C - Address 0x0000020C
@@ -44,6 +63,36 @@ s32 module_stop(SceSize args __attribute__((unused)), void *argp __attribute__((
 }
 
 // Subroutine sceChkreg_driver_59F8491D - Address 0x00000438
-s32 sceChkregGetPsCode(u8 *code) {
-
+s32 sceChkregGetPsCode(u8 *code)
+{
+    return 0;
+}
+
+// Subroutine sceChkreg_driver_54495B19 - Address 0x00000390
+s32 sceChkregCheckRegion(u32 unk1, u32 unk2)
+{
+    s32 ret = SCE_ERROR_SEMAPHORE;
+    
+    if (sceKernelWaitSema(g_chkreg.sema, 1, NULL) == 0)
+    {
+        if (/*(DAT_00000044 != 0) ||*/ (ret = sub_00000000(), ret == 0))
+            ret = sub_00000128(0x80000000, (unk1 | unk2));
+        
+        if (sceKernelSignalSema(g_chkreg.sema, 1) != 0)
+            ret = SCE_ERROR_SEMAPHORE;
+    }
+
+    return ret;
+}
+
+s32 sceChkreg_driver_6894A027(void) {
+    return 0;
+}
+
+s32 sceChkreg_driver_7939C851(void) {
+    return 0;
+}
+
+s32 sceChkreg_driver_9C6E1D34(void) {
+    return 0;
 }