diff --git a/arch/x86/mmuContext.c b/arch/x86/mmuContext.c
index 164bb71..9a8438f 100644
--- a/arch/x86/mmuContext.c
+++ b/arch/x86/mmuContext.c
@@ -1,10 +1,11 @@
-#include "mmuContext.h"
 #include "alloc.h"
 #include "allocArea.h"
 #include "errno.h"
 #include "irq.h"
 #include "klibc.h"
 #include "list.h"
+#include "mem.h"
+#include "mmuContext.h"
 #include "paging.h"
 #include "stdarg.h"
 #include "types.h"
@@ -29,6 +30,8 @@ int mmuContextSetup()
     struct mmu_context *initialCtx;
     int ret = 0;
 
+    allocBookSlab(sizeof(struct mmu_context), PAGE_SIZE * 3, 0, 0);
+
     initialCtx = malloc(sizeof(struct mmu_context));
 
     if (initialCtx == NULL)
diff --git a/core/process.c b/core/process.c
new file mode 100644
index 0000000..182c33b
--- /dev/null
+++ b/core/process.c
@@ -0,0 +1,163 @@
+#include "process.h"
+#include "alloc.h"
+#include "irq.h"
+#include "klibc.h"
+#include "list.h"
+#include "mmuContext.h"
+
+struct process {
+    char name[PROCESS_NAME_MAX_LENGTH];
+    int ref;
+    int pid;
+    struct mmu_context *context;
+    struct thread *thList;
+
+    struct process *prev, *next;
+};
+
+static struct process *processList;
+static int nextPid;
+
+int processSetup()
+{
+    list_init(processList);
+    allocBookSlab(sizeof(struct process), PAGE_SIZE * 3, 0, 0);
+    nextPid = 0;
+
+    return 0;
+}
+
+struct process *processCreate(char *name)
+{
+    uint32_t flags;
+
+    struct process *new = (struct process *)malloc(sizeof(struct process));
+    if (new == NULL)
+        return NULL;
+
+    new->context = mmuContextCreate();
+    if (new->context == NULL) {
+        free(new);
+
+        return NULL;
+    }
+
+    strzcpy(new->name, name, PROCESS_NAME_MAX_LENGTH);
+    new->ref = 1;
+
+    disable_IRQs(flags);
+    new->pid = nextPid++;
+    list_add_tail(processList, new);
+    restore_IRQs(flags);
+
+    return new;
+}
+
+void processListPrint()
+{
+    struct process *proc;
+    int nbProcs;
+    struct thread *cur = getCurrentThread();
+
+    printf("PID NAME    NBTHREAD    REF\n");
+    list_foreach(processList, proc, nbProcs)
+    {
+        struct thread *th;
+        int nbTh;
+
+        printf("%d %s %d %d\n", proc->pid, proc->name, processCountThread(proc), proc->ref);
+        list_foreach_named(proc->thList, th, nbTh, prevInProcess, nextInProcess)
+        {
+            if (th == cur) {
+                printf("    th: 0x%x Current\n", th);
+            } else {
+                printf("    th: 0x%x in 0x%x\n", th, cpu_context_get_PC(th->cpuState));
+            }
+        }
+    }
+}
+
+int processCountThread(struct process *proc)
+{
+    int count;
+    struct thread *th;
+
+    list_foreach_named(proc->thList, th, count, prevInProcess, nextInProcess) {}
+
+    return count;
+}
+
+int processRef(struct process *proc)
+{
+    uint32_t flags;
+    // ref == 0 -> delete
+    assert(proc->ref > 0);
+
+    disable_IRQs(flags);
+    proc->ref++;
+    restore_IRQs(flags);
+
+    return 0;
+}
+
+int processUnref(struct process *proc)
+{
+    uint32_t flags;
+
+    assert(proc->ref > 0);
+
+    disable_IRQs(flags);
+
+    proc->ref--;
+    if (proc->ref > 0) {
+        restore_IRQs(flags);
+        return -EBUSY;
+    }
+    list_delete(processList, proc);
+    restore_IRQs(flags);
+
+    mmuContextUnref(proc->context);
+    free(proc);
+
+    return 0;
+}
+
+int processAddThread(struct process *proc, struct thread *th)
+{
+    uint32_t flags;
+
+    assert(proc->ref > 0);
+
+    th->process = proc;
+
+    disable_IRQs(flags);
+    processRef(proc);
+    list_add_tail_named(proc->thList, th, prevInProcess, nextInProcess);
+
+    restore_IRQs(flags);
+
+    return 0;
+}
+
+int processRemoveThread(struct thread *th)
+{
+    uint32_t flags;
+    struct process *proc;
+
+    disable_IRQs(flags);
+    proc = th->process;
+
+    list_delete_named(proc->thList, th, prevInProcess, nextInProcess);
+    restore_IRQs(flags);
+    processUnref(proc);
+
+    return 0;
+}
+
+int processSetName(struct process *proc, char *name)
+{
+    assert(name != NULL);
+    strzcpy(proc->name, name, PROCESS_NAME_MAX_LENGTH);
+
+    return 0;
+}
diff --git a/core/process.h b/core/process.h
new file mode 100644
index 0000000..4c6c9d2
--- /dev/null
+++ b/core/process.h
@@ -0,0 +1,15 @@
+#pragma once
+#include "thread.h"
+
+#define PROCESS_NAME_MAX_LENGTH 32
+
+struct process;
+
+int processSetup();
+struct process *processCreate(char *name);
+int processCountThread(struct process *proc);
+void processListPrint();
+int processRef(struct process *proc);
+int processUnref(struct process *proc);
+int processSetName(struct process *proc, char *name);
+int processAddThread(struct process *proc, struct thread *th);
diff --git a/core/thread.h b/core/thread.h
index 2bbb065..a8d6cbd 100644
--- a/core/thread.h
+++ b/core/thread.h
@@ -1,7 +1,9 @@
 #pragma once
 
+struct thread;
 #include "cpu_context.h"
 #include "mem.h"
+#include "process.h"
 
 #define THREAD_NAME_MAX_LENGTH 32
 #define THREAD_DEFAULT_STACK_SIZE PAGE_SIZE
@@ -21,12 +23,15 @@ struct thread {
     thread_state state;
     vaddr_t stackAddr;
     size_t stackSize;
+
     unsigned long jiffiesSleeping;
     int sleepHaveTimeouted;
-    struct thread *next;
-    struct thread *prev;
-    struct thread*timeNext;
-    struct thread *timePrev;
+
+    struct thread *next, *prev;
+    struct thread *timeNext, *timePrev;
+    // For User thread only
+    struct thread *nextInProcess, *prevInProcess;
+    struct process *process;
 };
 
 int threadSetup(vaddr_t mainStack, size_t mainStackSize);