diff --git a/kaleid/kernel/ke/idt.c b/kaleid/kernel/ke/idt.c
index 002b972..c279bde 100644
--- a/kaleid/kernel/ke/idt.c
+++ b/kaleid/kernel/ke/idt.c
@@ -127,12 +127,12 @@ void KeSetupIDT(void)
     KeSetIDTGate(0x04, (ulong)isr4, codeSeg, 0x8E, 2);
     KeSetIDTGate(0x05, (ulong)isr5, codeSeg, 0x8E, 2);
     KeSetIDTGate(0x06, (ulong)isr6, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x07, (ulong)isr7, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x08, (ulong)isr8, codeSeg, 0x8E, 1);
+    KeSetIDTGate(0x07, (ulong)isr7, codeSeg, 0x8E, 2);   // XXX device not available, useful for FPU save/restore when multitasking
+    KeSetIDTGate(0x08, (ulong)isr8, codeSeg, 0x8E, 1);   // DOUBLE FAULT
     KeSetIDTGate(0x09, (ulong)isr9, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x0A, (ulong)isr10, codeSeg, 0x8E, 0); // INVALID TSS
+    KeSetIDTGate(0x0A, (ulong)isr10, codeSeg, 0x8E, 0);  // INVALID TSS
     KeSetIDTGate(0x0B, (ulong)isr11, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x0C, (ulong)isr12, codeSeg, 0x8E, 1);
+    KeSetIDTGate(0x0C, (ulong)isr12, codeSeg, 0x8E, 1);  // STACK SEGMENT FAULT
     KeSetIDTGate(0x0D, (ulong)isr13, codeSeg, 0x8E, 2);
     KeSetIDTGate(0x0E, (ulong)isr14, codeSeg, 0x8E, 2);
     KeSetIDTGate(0x0F, (ulong)isr15, codeSeg, 0x8E, 2);  // INTEL RESERVED
@@ -154,22 +154,22 @@ void KeSetupIDT(void)
     KeSetIDTGate(0x1F, (ulong)isr31, codeSeg, 0x8E, 2);  // INTEL RESERVED
 
     // Set IDT IRQs Gates
-    KeSetIDTGate(0x20, (ulong)isr32, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x21, (ulong)isr33, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x22, (ulong)isr34, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x23, (ulong)isr35, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x24, (ulong)isr36, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x25, (ulong)isr37, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x26, (ulong)isr38, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x27, (ulong)isr39, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x28, (ulong)isr40, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x29, (ulong)isr41, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2A, (ulong)isr42, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2B, (ulong)isr43, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2C, (ulong)isr44, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2D, (ulong)isr45, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2E, (ulong)isr46, codeSeg, 0x8E, 2);
-    KeSetIDTGate(0x2F, (ulong)isr47, codeSeg, 0x8E, 2);
+    KeSetIDTGate(0x20, (ulong)isr32, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x21, (ulong)isr33, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x22, (ulong)isr34, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x23, (ulong)isr35, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x24, (ulong)isr36, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x25, (ulong)isr37, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x26, (ulong)isr38, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x27, (ulong)isr39, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x28, (ulong)isr40, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x29, (ulong)isr41, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2A, (ulong)isr42, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2B, (ulong)isr43, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2C, (ulong)isr44, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2D, (ulong)isr45, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2E, (ulong)isr46, codeSeg, 0x8E, 3);
+    KeSetIDTGate(0x2F, (ulong)isr47, codeSeg, 0x8E, 3);
 
     KeIdtIsInitialized++;
 
diff --git a/kaleid/kernel/mm/gdt.c b/kaleid/kernel/mm/gdt.c
index 0ec7cb6..79f9bc6 100644
--- a/kaleid/kernel/mm/gdt.c
+++ b/kaleid/kernel/mm/gdt.c
@@ -55,6 +55,7 @@ void MmInitGdt(void)
 
     tss.ist1 = (ulong)0x0007FFFF;  // ISR RESCUE STACK, GARANTIED FREE FOR USE BY OSDEV.ORG
     tss.ist2 = (ulong)0x00EFFFFF;  // ISR STACK, GARANTIED FREE FOR USE BY OSDEV.ORG
+    tss.ist3 = (ulong)0x00EF0000;  // ISR STACK, GARANTIED FREE FOR USE BY OSDEV.ORG
     tss.iomap_base = sizeof(tss);
 
     memmove(&gdt[2], &tssDesc, sizeof(TssDescriptor_t));
diff --git a/kaleid/kernel/sh/testcmds.c b/kaleid/kernel/sh/testcmds.c
index 716ce2a..9c05d3c 100644
--- a/kaleid/kernel/sh/testcmds.c
+++ b/kaleid/kernel/sh/testcmds.c
@@ -109,6 +109,42 @@ error_t CmdDumpATASect(int argc, char **argv, char *cmdline)
     return EOK;
 }
 
+error_t CmdDumpMem(int argc, char **argv, char *cmdline)
+{
+    char sector[1024] = {0};
+    char *address = (char*)atol(argv[1]);
+    int nb = 1; //atoi(argv[2]);
+    int x = 0;
+    int step = 16;
+
+    KernLog("Address begin: %p\n", address);
+
+    for (int i = 0; i < 1024*nb; i++) {
+        sector[i] = *address++;
+    }
+
+    while(x < 1024*nb) {
+        KernLog("%C", shcol);
+        for (int i = 0; i < step; i++) {
+            KernLog("%02x ", (uchar)sector[i+x]);
+        }
+        KernLog("   %C ", VGA_COLOR_LIGHT_BLUE);
+        for (int i = 0; i < step; i++) {
+            if (isprint(sector[i+x]))
+                KernLog("%c",
+                        sector[i+x]
+                        );
+            else
+                KernLog("%c", 0);
+        }
+        KernLog("\n");
+        x += step;
+    }
+
+    KernLog("\n\n");
+    return EOK;
+}
+
 error_t CmdFloatDiv(int argc, char **argv, char *cmdline)
 {
     double a = (double)atoi(argv[1]);
@@ -210,6 +246,7 @@ static Command_t testcmdtable[] =
     { "args",       CmdArgs,           "Print command line"                   },
     { "atoi",       CmdAtoi,           "Print command line atoised"           },
     { "dmpsec",     CmdDumpATASect,    "Dump an ATA sector on screen"         },
+    { "dmp",        CmdDumpMem,        "Dump 1MB of memory starting from addr"},
     { "help",       CmdHelpTest,       "Show this message"                    },
     { "div",        CmdFloatDiv,     "Float div. Usage : div a b. Returns a/b"},
     { "pf",         CmdPF,             "Provoke a PF. Usage: pfault <address>"},