diff --git a/kernel/Makefile b/kernel/Makefile
index 8fc99a5..f78c1cc 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -25,7 +25,7 @@ INTERNALCFLAGS  :=  -mgeneral-regs-only    \
 					-I/opt/cross/include/  \
 					-I../lai/include       \
 					-fpie                  \
-					-D BIGGER_FONT
+#					-D BIGGER_FONT
 
 
 LAI_FILE := ../lai/lai.elf
diff --git a/kernel/acpi/power.c b/kernel/acpi/power.c
index d1f9331..aae08fe 100644
--- a/kernel/acpi/power.c
+++ b/kernel/acpi/power.c
@@ -1,6 +1,7 @@
 #include "power.h"
 #include "../lib/assert.h"
 #include "../drivers/ps2kb.h"
+#include "../int/idt.h"
 
 static void (*funcs[MAX_SHUTDOWN_FUNCS])(void);
 static int n_funcs = 0;
diff --git a/kernel/drivers/pcie/pcie.c b/kernel/drivers/pcie/pcie.c
index 5105b48..2d841c6 100644
--- a/kernel/drivers/pcie/pcie.c
+++ b/kernel/drivers/pcie/pcie.c
@@ -1,16 +1,16 @@
 #include "pcie.h"
+#include "scan.h"
+
 #include "../../lib/logging.h"
-#include "../../lib/dump.h"
 #include "../../lib/assert.h"
-#include "../../memory/heap.h"
 #include "../../memory/paging.h"
 #include "../../lib/string.h"
 
 
-static struct pcie_device* devices = NULL;
-
+static struct pcie_dev* devices = NULL;
+static unsigned n_devices = 0;
 void pcie_init(void) {
-    devices = pcie_scan();
+    devices = pcie_scan(&n_devices);
 }
 
 
diff --git a/kernel/drivers/pcie/scan.c b/kernel/drivers/pcie/scan.c
index ae65d5b..3488491 100644
--- a/kernel/drivers/pcie/scan.c
+++ b/kernel/drivers/pcie/scan.c
@@ -32,24 +32,36 @@ struct PCIE_config_space {
 };
 
 
-// higher bus number: could be 0xff
-// if there is only one bus group
-static size_t max_bus = 0;
 
 struct PCIE_Descriptor pcie_descriptor = {0};
-// 0   | group | bus | 0 | slot  | 0 | func |
-//     |   2   | 8   | 1 |  3    | 1 |  3   |
-//             16    8              
 
-__attribute__((pure))
+
+// array of all installed devices' functions
+static struct pcie_dev* found_devices = NULL;
+static size_t n_found_devices = 0;
+
+// we construct a linked list first
+// so we need a node struct
+struct early_device_desc {
+    uint16_t bus, device, function, domain;
+    struct PCIE_config_space* config_space;
+
+    struct early_device_desc* next;
+};
+// used to iterate over devices when scanning
+struct early_device_desc head_node = {.next = NULL};
+struct early_device_desc* current = &head_node; 
+
+
+////__attribute__((pure))
 static struct resource get_bar_resource(
             struct PCIE_config_space* cs, 
             unsigned i) 
 {
-    volatile uint32_t* bar_reg = (uint32_t*)&cs->bar[i];
-    uint32_t val = *bar_reg;
+    volatile uint64_t* bar_reg = (uint64_t*)&cs->bar[i];
+    uint64_t val = *bar_reg;
 
-    *bar_reg = ~1;
+    *bar_reg = ~0llu;
     
     unsigned size = ~ *bar_reg + 1;
 
@@ -57,13 +69,13 @@ static struct resource get_bar_resource(
 
 
     return (struct resource) {
-        .addr = val,
+        .addr = (void *)val,
         .size = size,
     };
 }
 
 
-__attribute__((pure))
+//__attribute__((pure))
 static struct PCIE_config_space*  
                 get_config_space_base(unsigned bus_group,
                                       unsigned bus, 
@@ -72,12 +84,15 @@ static struct PCIE_config_space*
                                       ) 
 {
     assert(bus_group < pcie_descriptor.size);
+    assert(bus_group == 0);
     struct PCIE_busgroup* group_desc = &pcie_descriptor.array[bus_group];
-
+    return 0;
+    /*
     return group_desc->address + (
         (bus - group_desc->start_bus) << 20 
       | device                        << 15 
       | func                          << 12);
+      */
 }
 
 
@@ -87,22 +102,86 @@ static int __attribute__((pure))
                              unsigned device, 
                              unsigned func) 
 {
+//    struct PCIE_config_space* config_space = 
+//                get_config_space_base(bus_group, bus,device,func);
+    return 8086;
+    //return config_space->vendorID;
+}
+
+
+static void insert(
+        unsigned bus_group, 
+        unsigned bus, 
+        unsigned device, 
+        unsigned func)
+{ 
+    /*
     struct PCIE_config_space* config_space = 
-                get_config_space_base(bus_group, bus,device,func);
-    
-    return config_space->vendorID;
+               get_config_space_base(bus_group,
+                                     bus,
+                                     device,
+                                     func)
+    /*
+        ->next = malloc(sizeof(struct early_device_desc));
+
+    current = current->next;
+    current->next           = NULL;
+    // fill the new node
+    current->domain       = bus_group;
+    current->bus          = bus;
+    current->device       = device;
+    current->function     = func;
+    current->config_space = config_space;
+*/
+    asm  volatile("nop");
+    //printf("%2x:%2x:%2x.%2x - %lx", bus_group, bus, device, func);
+    //n_found_devices++;
 }
 
 
-struct early_device_descriptor {
-    uint16_t bus, device, function, domain;
-    struct PCIE_config_space* config_space;
-};
+// scan a single device
+// adds its functions in the linked list
+// if it finds some
+static void scan_device(unsigned bus_group, 
+                        unsigned bus, 
+                        unsigned device)
+{
 
-// array of all installed devices' functions
-static struct pcie_dev* found_devices = NULL;
-static size_t n_found_devices = 0;
+    // if the first function doesn't exist, so 
+    // does the device
+    uint16_t vendorID = get_vendorID(bus_group, 
+                                     bus,
+                                     device, 
+                                     0);
+    //return;
+
+    // no device!
+    if(vendorID == 0xFFFF)
+        return;
+    // a device is there!
+    insert(bus_group,
+           bus, 
+           device, 
+           0
+    );
+    
+    // check for additionnal functions for this
+    // device
+    for(unsigned func = 1; func < 8; func++) {
 
+        if(get_vendorID(bus_group,
+                        bus,
+                        device, 
+                        func) != vendorID)
+            continue;
+        
+        insert(bus_group,
+               bus, 
+               device, 
+               func
+        );
+    }
+}
 
 /**
  * constructs the found_devices array
@@ -111,36 +190,9 @@ static void scan_devices(void) {
 
     // first create a linked list
     // as we dont know how many devices are present
-    struct device_desc_node {
-        struct early_device_descriptor e;
-        struct device_desc_node* next;
-    };
 
-// head of the list 
-    struct device_desc_node ghost_node = {.next = NULL};
-    struct device_desc_node* current = &ghost_node; 
-// count the number of devices
 
-    void insert(
-        unsigned bus, 
-        unsigned device, 
-        unsigned func, 
-        struct PCIE_config_space* config_space
-        ) 
-    {            
-        current->next = malloc(sizeof(struct device_desc_node));
-
-        current = current->next;
-        current->next           = NULL;
-
-        // fill the new node
-        current->e.bus          = bus;
-        current->e.device       = device;
-        current->e.function     = func;
-        current->e.config_space = config_space;
-
-        n_found_devices++;
-    }
+// count the number of devices
 
     for(unsigned bus_group_i = 0; 
                  bus_group_i < pcie_descriptor.size; 
@@ -157,67 +209,41 @@ static void scan_devices(void) {
         {
             for(unsigned device = 0; device < 32; device++) {
                 
-                // if the first function doesn't exist, so does 
-                // the device
-                uint16_t vendorID = get_vendorID(bus_group, 
-                                                 bus,
-                                                 device, 
-                                                 0);
-
-                if(vendorID == 0xFFFF)
-                    continue;
-
-                insert(bus, 
-                    device, 
-                    0, 
-                    get_config_space_base(bus_group, 
-                                          bus,
-                                          device,
-                                          0)
-                );
-                
-                for(unsigned func = 1; func < 8; func++) {
-
-                    if(get_vendorID(bus_group,
-                                    bus,
-                                    device, 
-                                    func) != vendorID)
-                        continue;
-                    
-                    insert(bus, 
-                        device, 
-                        func, 
-                        get_config_space_base(bus_group,
-                                              bus,
-                                              device,
-                                              func)
-                    );
-                }
+                scan_device(bus_group,bus,device);
             }
         }
     }
-    
+
+}
+
+
+// create the output array
+// with the 
+static void create_array(void) {
 
     // now create the final array
     found_devices = malloc(
                     n_found_devices 
-                    * sizeof(struct early_device_descriptor));
-    
+                    * sizeof(struct pcie_dev));
 
     // now fill it and free the devices structure
     struct pcie_dev* ptr = found_devices;
 
-    for(struct device_desc_node* device = ghost_node.next;
-                                 device != NULL;
-                                 ) {
-        struct early_device_descriptor* early_desc = &device->e;
-        struct PCIE_config_space* cs = early_desc->config_space;
+    unsigned i = 0;
+
+    for(struct early_device_desc* device = head_node.next;
+                                  device != NULL;
+                                  device = device->next)
+    {
+        struct PCIE_config_space* cs = device->config_space;
 
-        *ptr = (struct pcie_dev) {
+        assert(i++ < n_found_devices);        
+
+        *ptr++ = (struct pcie_dev) {
                 .bars = {
-                    get_bar_resource(cs, 0),
-                    get_bar_resource(cs, 1),
-                    get_bar_resource(cs, 2),
+                    0,//get_bar_resource(cs, 0),
+                    0,//get_bar_resource(cs, 1),
+                    0,//get_bar_resource(cs, 2),
                 },
                 .config_space = cs,
                 .driver = NULL,
@@ -230,29 +256,20 @@ static void scan_devices(void) {
                     .revID        = cs->revID,
                 },
                 .path = (pcie_path_t) {
-                    .domain = early_desc->domain,
-                    .bus    = early_desc->bus,
-                    .device = early_desc->device,
-                    .func   = early_desc->function,
-                }
+                    .domain = device->domain,
+                    .bus    = device->bus,
+                    .device = device->device,
+                    .func   = device->function,
+                },
         };
-
-struct resource bars[3];
-struct dev_info info;
-    
-void* config_space;
-
-pcie_path_t path;
-
-struct driver* driver;
-        memcpy(ptr++, &device->e, sizeof(struct early_device_descriptor));
         
 
-        struct device_desc_node* next = device->next;
+
         free(device);
-        device = next;
     }
 }
+
+
 // identity map every page that might be a config space 
 static void identity_map_possible_config_spaces(void) {
     for(unsigned i = 0; i < pcie_descriptor.size; i++) {
@@ -273,7 +290,10 @@ static void identity_map_possible_config_spaces(void) {
 
 static void identity_unmap_possible_config_spaces(void) {
     for(unsigned i = 0; i < pcie_descriptor.size; i++)
-        unmap_pages((uint64_t)pcie_descriptor.array[i].address, 256 * 32 * 8);
+        unmap_pages(
+            (uint64_t)pcie_descriptor.array[i].address,
+            256 * 32 * 8
+        );
 }
 
 /**
@@ -281,24 +301,23 @@ static void identity_unmap_possible_config_spaces(void) {
  * we identity map the pcie configuration spaces
  * 
  */
-struct pcie_device* pcie_scan(void) {
+struct pcie_dev* pcie_scan(unsigned* size) {
 
     log_debug("scanning pcie devices...");
 
-    // calculate the highest bus number
-
-    for(unsigned i = 0; i < pcie_descriptor.size; i++) {
-        // map the corresponding pages 
-        if(pcie_descriptor.array[i].end_bus > max_bus)
-            max_bus = pcie_descriptor.array[i].end_bus;
-    }
 
     log_debug("%u PCIE bus groups found", pcie_descriptor.size);
 
 
     identity_map_possible_config_spaces();
+    log_debug("identity_map_possible_config_spaces()", pcie_descriptor.size);
+
+    //scan_devices();
+    log_debug("devices scanned", pcie_descriptor.size);
 
-    scan_devices();
+
+    //create_array();
+    //log_debug("memory shit done", pcie_descriptor.size);
 
 
     for(unsigned i = 0; i < n_found_devices; i++) {
@@ -318,8 +337,13 @@ struct pcie_device* pcie_scan(void) {
             found_devices[i].info.vendorID
         );
     }
+    
 
-    identity_unmap_possible_config_spaces();
+//    identity_unmap_possible_config_spaces();
     log_info("found %u PCI Express devices", n_found_devices);
+
+    *size = n_found_devices;
+    return found_devices;
+
 }
 
diff --git a/kernel/drivers/pcie/scan.h b/kernel/drivers/pcie/scan.h
index 6fa6426..09d9647 100644
--- a/kernel/drivers/pcie/scan.h
+++ b/kernel/drivers/pcie/scan.h
@@ -31,6 +31,6 @@ struct PCIE_Descriptor {
 extern struct PCIE_Descriptor pcie_descriptor;
 
 
-struct pcie_device* pcie_scan(void);
+struct pcie_dev* pcie_scan(unsigned* size);
 
 
diff --git a/kernel/entry.c b/kernel/entry.c
index 8917b52..b30f92f 100644
--- a/kernel/entry.c
+++ b/kernel/entry.c
@@ -204,20 +204,24 @@ void _start(struct stivale2_struct *stivale2_struct) {
         
     puts(&_binary_bootmessage_txt);
 
-    asm volatile("hlt");
     
     printf("boot logs:\n");
     puts(log_get());
     log_flush();
 
     pcie_init();
-    
+
+
     pic_init();
     ps2kb_init();
 
     void kbhandler(const struct kbevent* ev) {
         if(ev->type == KEYRELEASED && ev->scancode == PS2KB_ESCAPE) {
             shutdown();
+            __builtin_unreachable();
+        }
+        if(ev->type == KEYPRESSED && ev->keycode != 0) {
+            printf("%c", ev->keycode);
         }
     };
     ps2kb_set_event_callback(kbhandler);
diff --git a/kernel/int/isr.c b/kernel/int/isr.c
index 7de6e00..5d85f86 100644
--- a/kernel/int/isr.c
+++ b/kernel/int/isr.c
@@ -13,7 +13,7 @@ static void print_frame(char* buff, struct IFrame* interrupt_frame) {
     sprintf(buff,
         "RIP: %16lx\n"
         "RSP: %16lx\n"
-        "CS:  %16lx   SS:  %16lx\n"
+        "CS:  %4lx   SS:  %4lx\n"
         "\n"
         "RFLAGS: %8lx\n",
         interrupt_frame->RIP,    
@@ -38,7 +38,7 @@ __attribute__((interrupt)) void ISR_general_handler(struct IFrame* interrupt_fra
 }
 __attribute__((interrupt)) void ISR_error_handler(struct IFrame* interrupt_frame, uint64_t error_code) {
     (void) error_code;
-    printf("ERROR CODE: %lu\n", error_code);
+    printf("ERROR CODE: 0x%lx\n", error_code);
     panic_handler("ISR_error_handler", interrupt_frame);
 }
 __attribute__((interrupt)) void ISR_div_by_zero_handler(struct IFrame* interrupt_frame) {
@@ -89,7 +89,7 @@ __attribute__((interrupt)) void ISR_stack_segment_fault_handler(struct IFrame* i
 }
 __attribute__((interrupt)) void ISR_general_protection_fault_handler(struct IFrame* interrupt_frame, uint64_t error_code) {
     (void) error_code;
-    printf("ERROR CODE: %lu\n", error_code);
+    printf("ERROR CODE: 0x%lx\n", error_code);
     panic_handler("ISR_general_protection_fault_handler", interrupt_frame);
 }
 __attribute__((interrupt)) void ISR_page_fault_handler(struct IFrame* interrupt_frame, uint64_t error_code) {
diff --git a/kernel/int/pic.c b/kernel/int/pic.c
index 90cb3bb..22dda63 100644
--- a/kernel/int/pic.c
+++ b/kernel/int/pic.c
@@ -1,5 +1,6 @@
 #include "../lib/registers.h"
 #include "../lib/assert.h"
+#include "../lib/logging.h"
 #include "pic.h"
 
 
@@ -38,9 +39,17 @@ static void io_wait(void) {
 static uint16_t mask = 0xff;
 
 void pic_init(void) {
-
+	log_debug("init PIC...");
     outb(0x80, 0);
 
+// 0x343
+// 34*2=68
+
+    // mask all interrupts
+	// if already initialized
+	outb(PIC1_DATA, 0xff); 
+	outb(PIC2_DATA, 0xff); 
+
 	outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);  
     // starts the initialization sequence (in cascade mode)
 	io_wait();
@@ -50,6 +59,7 @@ void pic_init(void) {
     // ICW2: Master PIC vector offset
 	io_wait();
 
+
 	outb(PIC2_DATA, 24);                 
     // ICW2: Slave PIC vector offset
 	io_wait();
diff --git a/kernel/lib/panic.c b/kernel/lib/panic.c
index bfcea45..8dda3c4 100644
--- a/kernel/lib/panic.c
+++ b/kernel/lib/panic.c
@@ -3,6 +3,7 @@
 #include "../drivers/terminal/terminal.h"
 #include "../drivers/ps2kb.h"
 #include "../acpi/power.h"
+#include "../memory/vmap.h"
 
 
 int zero = 0;
@@ -17,16 +18,28 @@ static inline __attribute__((always_inline)) void stack_trace(void) {
     puts("backtrace:\n");
     
     for(unsigned i = 0; i < MAX_STACK_TRACE; i++) {
+        //printf("oui. %lx ", ptr);
         
         if(*ptr == 0) // reached the top
             break;
-        printf("\t%llx \n", *(ptr+1));
+        
+        void* rip = *(ptr+1);
+        if(!is_kernel_memory(rip)) {
+            //maybe it is an exception error code
+            rip = *(ptr+2);
+            
+            printf("   %llx - EXCEPTION\n", rip);
+        }
+        else
+            printf("   %llx\n", rip);
+
 
         ptr = *ptr;
     }
 }
 
 __attribute__((noreturn)) void panic(const char* panic_string) {
+
     // checks if video is operationnal
     if(get_terminal_handler() != NULL) {
         terminal_set_colors(0xfff0a0, 0x400000);
@@ -52,7 +65,6 @@ __attribute__((noreturn)) void panic(const char* panic_string) {
         ps2kb_poll_wait_for_key(PS2KB_ESCAPE);
         shutdown();
     }
-    
     asm volatile("cli");
     asm volatile("hlt");
     
diff --git a/kernel/lib/string.c b/kernel/lib/string.c
index b0d046f..bbb5652 100644
--- a/kernel/lib/string.c
+++ b/kernel/lib/string.c
@@ -223,6 +223,10 @@ void * memcpy (void* restrict _dest,
 void * memset (void * _buf, int _ch, size_t n) {
     uint8_t ch = *(uint8_t*)(&_ch);
     uint8_t* buf = _buf;
+    
+    for(;n > 0; --n)
+        *(buf++) = ch;
+    return buf;
 
     // first unaligned bytes
     for(;n > 0 && (uint64_t)buf % 8 != 0; --n)
diff --git a/kernel/memory/heap.c b/kernel/memory/heap.c
index 4d4b7ca..a51c307 100644
--- a/kernel/memory/heap.c
+++ b/kernel/memory/heap.c
@@ -260,9 +260,6 @@ void heap_init(void) {
 void* __attribute__((noinline)) malloc(size_t size) {
     // align the size to assure that 
     // the whole structure is alligned
-
-    printf("malloc(%x)", size);
-
     size = ((size + 7 ) / 8) * 8;
     if(size < MIN_SEGMENT_SIZE)
         size = MIN_SEGMENT_SIZE;
@@ -425,9 +422,9 @@ void malloc_test(void) {
 
     uint64_t size = 5;
 
-    for(int j = 0; j < 100; j++) {
+    for(int j = 0; j < 4000; j++) {
         for(int i = 0; i < 128; i++) {
-            arr[i] = malloc(size % 1024);
+            arr[i] = malloc(size % (1024*1024));
             size = (16807 * size) % ((1lu << 31) - 1);
         }
         
diff --git a/kernel/memory/paging.c b/kernel/memory/paging.c
index a7433ff..f27ef60 100644
--- a/kernel/memory/paging.c
+++ b/kernel/memory/paging.c
@@ -558,16 +558,18 @@ void map_pages(uint64_t physical_addr,
     internal_map_pages(physical_addr, virtual_addr, count, flags);
 }
 
-// return 1 if any of the page entries is present
-int is_range_unmapped(pte* page_table, unsigned begin, unsigned end) {
+// return 1 iif the no entry is present in the range
+static int is_table_empty(pte* page_table, unsigned begin, unsigned end) {
+    assert(begin <= end);
+    assert(end <= 512);
 
     pte* translated = translate_address(page_table);
 
     for(unsigned i = begin; i < end; i++) {
         if(present_entry(translated[i]))
-            return 1;
+            return 0;
     }
-    return 0;
+    return 1;
 }
 
 void unmap_pages(uint64_t virtual_addr, size_t count) {
@@ -607,22 +609,23 @@ void unmap_pages(uint64_t virtual_addr, size_t count) {
                 panic(buff);
             }
 
+            // actually erase the entry
+            *entry_ptr = 0;
+
             pti++;
             count--;
             virtual_addr  += 0x1000;      
         }
-        
+        /*
         unsigned end = pti;
-
         // unmap the page map if empty
-        if(is_range_unmapped(pdentry, 0, begin))
-            continue;
-        if(is_range_unmapped(pdentry, end, 512))
-            continue;
-        
-        // the page table contains no entry
-        // let's free it
-        physfree(pdentry);
-
+        if(is_table_empty(pdentry, 0, begin) &&
+           is_table_empty(pdentry, end, 512))
+        {
+            // the page table contains no entry
+            // let's free it
+//            physfree(pdentry);
+        }
+        */
     }
 }
diff --git a/kernel/memory/physical_allocator.c b/kernel/memory/physical_allocator.c
index 37ce626..0bb5c2a 100644
--- a/kernel/memory/physical_allocator.c
+++ b/kernel/memory/physical_allocator.c
@@ -107,6 +107,9 @@ static void init_memory_range(struct memory_range* range, uint64_t addr, size_t
 
     // zero all the bit maps
     memset(header->bitmap_level3, 0, 128+256+512+2048);
+    memset(addr+0x1000, 
+            0xff, 
+            range->length);
 
     // we use one page per region for the header
     header->available[0] = (length-1);
@@ -137,11 +140,10 @@ void init_physical_allocator(const struct stivale2_struct_tag_memmap* memmap) {
     for(unsigned i = 0; i < memmap->entries; i++) {
 
         const struct stivale2_mmap_entry e = memmap->memmap[i];
+    // memory ranges in account
         
     // dont take kernel & modules or acpi reclaimable
-    // memory ranges in account
         if(e.type == STIVALE2_MMAP_USABLE) {
-            
 
         // ceil the size to the number of pages
 
@@ -160,6 +162,7 @@ void init_physical_allocator(const struct stivale2_struct_tag_memmap* memmap) {
 
             while(size > 0) {
 
+
                 size_t s;// the actual size of the current 
 
                 if(size > MAX_SIZE)
@@ -169,6 +172,7 @@ void init_physical_allocator(const struct stivale2_struct_tag_memmap* memmap) {
                 else
                     s = size;
 
+
                 struct memory_range* range = &memory_ranges_buffer[j++];
                 init_memory_range(range, base, s);