diff --git a/include/base/crtlib.h b/include/base/crtlib.h
index 9bdd0b7..b6f6f28 100644
--- a/include/base/crtlib.h
+++ b/include/base/crtlib.h
@@ -183,14 +183,14 @@ unsigned long strtoul(const char *restrict, char **restrict, int);
 
 //------------------------------------------//
 
-void *calloc(size_t, size_t) __attribute__((__malloc__));
-void *malloc(size_t) __attribute__((__malloc__));
-void free(void *);
+void   *calloc(size_t, size_t) __attribute__((__malloc__));
+void   *malloc(size_t) __attribute__((__malloc__));
+void    free(void *);
 
 //------------------------------------------//
 
 int     rand(void);
-void    srand(unsigned int);
+void    srand(unsigned long);
 
 //------------------------------------------//
 
diff --git a/include/kernel/base.h b/include/kernel/base.h
index 113c711..2fe40ac 100644
--- a/include/kernel/base.h
+++ b/include/kernel/base.h
@@ -153,6 +153,14 @@ extern CpuCore_t              _KeCPUTable[NCPUS];
 
 //----------------------------------------------------------------------------//
 
+#ifdef NDEBUG
+#define DEBUG if(0)
+#else
+#define DEBUG if(1)
+#endif
+
+//----------------------------------------------------------------------------//
+
 error_t KernLog(const char *, ...);
 
 #ifndef _NO_DEBUG
diff --git a/include/kernel/heap.h b/include/kernel/heap.h
index b5de219..eccce67 100644
--- a/include/kernel/heap.h
+++ b/include/kernel/heap.h
@@ -31,9 +31,17 @@
 
 //----------------------------------------------------------------------------//
 
+// Absolute heap max
+#define MM_HEAP_MAX     (256 * MB)
+
 // Address of the heap
 extern void *_heap_start;
+
+// Current end of the heap
 extern void *_heap_end;
+
+// Maximal size of the heap
+// (Default: MM_HEAP_MAX)
 extern size_t _heap_max;
 
 void MmInitHeap(void);
diff --git a/kaleid/kernel/init/table.c b/kaleid/kernel/init/table.c
index aec98a7..4067e5b 100644
--- a/kaleid/kernel/init/table.c
+++ b/kaleid/kernel/init/table.c
@@ -25,7 +25,7 @@
 #include <kernel/boot.h>
 
 int             KeCPUCount = 1;
-CpuCore_t     _KeCPUTable[NCPUS] = {0};
+CpuCore_t       _KeCPUTable[NCPUS] = {0};
 
 volatile BootInfo_t     BtBootTab = {0};
 volatile bool           KeIsPanicking = 0;
diff --git a/kaleid/kernel/io/rtc.c b/kaleid/kernel/io/rtc.c
index 427590d..bed3dd4 100644
--- a/kaleid/kernel/io/rtc.c
+++ b/kaleid/kernel/io/rtc.c
@@ -208,6 +208,40 @@ Time_t* IoGetRtcTime(void)
     return &IoRtcTime;
 }
 
+static uint IsLeapYear(uint year)
+{
+    if (!(year % 4)) {
+        return 0;
+    }
+    
+    return year % 100 == 0
+            ? (year % 400 == 0)
+            : 1;
+}
+
+static uint DaysInMonth(uint month, uint year)
+{
+    return (month == 2)
+            ? (28 + IsLeapYear(year))
+            : 31 - (month - 1) % 7 % 2;
+}
+
+ulong IoGetTimeStamp(void)
+{
+    Time_t *time = IoGetRtcTime();
+    
+    uint dpy = 365 + IsLeapYear(time->year);
+    uint dim = DaysInMonth(time->month, time->year + time->century * 100);
+    
+    return time->sec
+         + time->min  * 60
+         + time->hour * 60 * 60
+         + time->day  * 24 * 60 * 60
+         + time->month * dim * 24 * 60 * 60
+         + (time->year + time->century * 100)
+             * dpy * 24 * 60 * 60;
+}
+
 ulong IoGetRtcTicks(void)
 {
     return IoRtcTicks;
@@ -251,6 +285,8 @@ void IoEnableRtc(void)
     GetTimeFromRtc();
     KeRestoreIRQs(flags);
     IoEnableNMI();
+    
+    srand(IoGetTimeStamp());
 }
 
 void IoRtcWait(uint time)   // time in ms
diff --git a/kaleid/kernel/mm/heap.c b/kaleid/kernel/mm/heap.c
index 16562d1..d29d284 100644
--- a/kaleid/kernel/mm/heap.c
+++ b/kaleid/kernel/mm/heap.c
@@ -54,7 +54,7 @@ void MmInitHeap(void)
 
     // Initialize the heap
     _heap_end = _heap_start;
-    _heap_max = MmGetAvailZoneSize(_heap_end);
+    _heap_max = lmin(MM_HEAP_MAX, MmGetAvailZoneSize(_heap_end));
 
     KernLog("[InitHeap] Start address : %p, Max length : %u Mio\n\n",
             _heap_start, _heap_max / MB);
diff --git a/kaleid/kernel/sh/shcmds.c b/kaleid/kernel/sh/shcmds.c
index 7307b95..c02bdb8 100644
--- a/kaleid/kernel/sh/shcmds.c
+++ b/kaleid/kernel/sh/shcmds.c
@@ -82,6 +82,9 @@ error_t CmdMemMap(int argc, char **argv, char *cmdline)
 
 error_t CmdMemUsage(int argc, char **argv, char *cmdline)
 {
+    char var;
+    (void)var;
+
     size_t stack_cur;
     size_t img_diff, stack_diff;
     size_t heap_start, heap_end;
@@ -95,9 +98,15 @@ error_t CmdMemUsage(int argc, char **argv, char *cmdline)
     
     KeRestoreIRQs(flags);
     
-    img_diff = (size_t)BtLoaderInfo.kernelEndAddr - (size_t)BtLoaderInfo.kernelAddr;
-    stack_diff = (size_t)BtLoaderInfo.stackEndAddr - ((size_t)BtLoaderInfo.kernelEndAddr + 16);
+    img_diff = (size_t)BtLoaderInfo.kernelEndAddr
+             - (size_t)BtLoaderInfo.kernelAddr;
+
+    stack_diff = (size_t)BtLoaderInfo.stackEndAddr
+             - ((size_t)BtLoaderInfo.kernelEndAddr + 16);
+
     heap_diff = (size_t)heap_end - (size_t)heap_start;
+    
+    stack_cur = (size_t)BtLoaderInfo.stackEndAddr - (size_t)&var;
 
     KernLog("Kernel image\n");
 
@@ -126,20 +135,14 @@ error_t CmdMemUsage(int argc, char **argv, char *cmdline)
                 _ADDR_TO_MB((size_t)BtLoaderInfo.stackEndAddr),
                 _ADDR_TO_KB((size_t)BtLoaderInfo.stackEndAddr),
                 _ADDR_TO_B((size_t)BtLoaderInfo.stackEndAddr));
-
-    BARRIER();
-    char var;
-    (void)var;
-
-    stack_cur = (size_t)BtLoaderInfo.stackEndAddr - (size_t)&var;
     
-    KernLog("\tends at:\t\t%p (%4luMB + %4luKB + %4luB)\n",
+    KernLog("\tcurrently at:\t%p (%4luMB + %4luKB + %4luB)\n",
                 (size_t)&var,
                 _ADDR_TO_MB((size_t)&var),
                 _ADDR_TO_KB((size_t)&var),
                 _ADDR_TO_B((size_t)&var));
 
-    KernLog("\tmin addr:\t\t%p (%4luMB + %4luKB + %4luB)\n",
+    KernLog("\tmin address:\t%p (%4luMB + %4luKB + %4luB)\n",
                 (size_t)BtLoaderInfo.kernelEndAddr+16,
                 _ADDR_TO_MB((size_t)BtLoaderInfo.kernelEndAddr+16),
                 _ADDR_TO_KB((size_t)BtLoaderInfo.kernelEndAddr+16),
diff --git a/kaleid/kernel/sh/shell.c b/kaleid/kernel/sh/shell.c
index 9da298c..4d931a9 100644
--- a/kaleid/kernel/sh/shell.c
+++ b/kaleid/kernel/sh/shell.c
@@ -60,7 +60,7 @@ void KeStartShell(void)
     uchar ch;
     error_t rc;
     
-    char cmdbuf[CMDBUFSIZE] = { 0 };
+    char *cmdbuf = malloc(CMDBUFSIZE);
     char *bufptr = cmdbuf;
 
     argv0 = malloc(ARG_MAX);
@@ -78,7 +78,7 @@ void KeStartShell(void)
                 bufptr = cmdbuf;
                 ExecuteCommand(cmdbuf);
 
-                memzero(cmdbuf, sizeof(cmdbuf));
+                memzero(cmdbuf, CMDBUFSIZE);
                 BFlushBuf(BStdIn);
                 KernLog("shell> ");
                 BFlushBuf(BStdOut);
@@ -130,7 +130,7 @@ void KeStartShell(void)
             bufptr = cmdbuf;
             ExecuteCommand(cmdbuf);
             
-            memzero(cmdbuf, sizeof(cmdbuf));
+            memzero(cmdbuf, CMDBUFSIZE);
             KernLog("shell> ");
             BFlushBuf(BStdIn);
             BFlushBuf(BStdOut);
diff --git a/kaleid/libc/rand.c b/kaleid/libc/rand.c
index 187e41c..eb87ceb 100644
--- a/kaleid/libc/rand.c
+++ b/kaleid/libc/rand.c
@@ -27,7 +27,7 @@
 //
 // Seed value
 //
-static ulong next = 7756;
+static ulong next = 1;
 
 //
 // Returns a pseudo-random integer
@@ -42,7 +42,7 @@ int rand(void)
 //
 // (Re)Set the random seed
 //
-void srand(uint seed)
+void srand(ulong seed)
 {
     next = (ulong)seed;
 }