diff --git a/README b/README
index 7b37e03..1e56510 100644
--- a/README
+++ b/README
@@ -55,7 +55,7 @@ BUILD
 
 $ KOLIBRI=/path/to/kolibrios make
 
-/path/to/kolibrios is where you checked out `svn co svn://kolibrios.org`.
+/path/to/kolibrios is where you checked out 'svn co svn://kolibrios.org'.
 
 
 Architecture
@@ -75,8 +75,29 @@ sudo cp --parents /sys/firmware/acpi/tables/?SDT* /sys/bus/pci/devices/*/config
 Troubleshooting
 ---------------
 
-# sysctl -w kernel.yama.ptrace_scope=0
-# sysctl -w vm.mmap_min_addr=0
+# lfbviewx
+
+Allow reading process_vm_readv syscall.
+
+    # sysctl -w kernel.yama.ptrace_scope=0
+
+# umka_os
+
+Managing tap devices.
+
+    # ip tuntap add dev tap0 mode tap
+    # ip link set tap0 address 00:11:00:00:00:00
+    # ip addr add 10.50.0.1/24 dev tap0
+    # ip link set up dev tap0
+    # ip tuntap del dev tap0 mode tap
+
+To create tap devices.
+
+    # setcap cap_net_admin+ep ../umka_os
+
+Not yet used, but may be one day.
+
+    # sysctl -w vm.mmap_min_addr=0
 
 
 Links & Acknowledgements
diff --git a/linux/thread.c b/linux/thread.c
index 58df339..ea7d59d 100644
--- a/linux/thread.c
+++ b/linux/thread.c
@@ -11,12 +11,6 @@ void reset_procmask(void) {
     sigprocmask(SIG_UNBLOCK, &mask, NULL);
 }
 
-void set_procmask(void) {
-    sigemptyset (&mask);
-	sigaddset (&mask, SIGPROF);
-    sigprocmask(SIG_BLOCK, &mask, NULL);
-}
-
 int get_fake_if(ucontext_t *ctx) {
     // we fake IF with id flag
     return !(ctx->uc_mcontext.__gregs[REG_EFL] & (1 << 21));
diff --git a/shell.c b/shell.c
index a809f92..7589f3f 100644
--- a/shell.c
+++ b/shell.c
@@ -1354,7 +1354,7 @@ void shell_pci_get_path(int argc, char **argv) {
 void shell_stack_init(int argc, char **argv) {
     (void)argc;
     (void)argv;
-    kos_stack_init();
+    umka_stack_init();
 }
 
 void shell_net_add_device(int argc, char **argv) {
diff --git a/umka.asm b/umka.asm
index 225040a..15731e2 100644
--- a/umka.asm
+++ b/umka.asm
@@ -28,7 +28,7 @@ public coverage_end
 
 public sha3_256_oneshot as 'hash_oneshot'
 public kos_time_to_epoch
-public kos_init
+public umka_init
 
 public CURRENT_TASK as 'kos_current_task'
 public current_slot as 'kos_current_slot'
@@ -52,7 +52,7 @@ public acpi_ssdt_size as 'kos_acpi_ssdt_size'
 public acpi_ctx
 public acpi_usage as 'kos_acpi_usage'
 
-public stack_init
+public stack_init as 'kos_stack_init'
 public net_add_device
 
 public draw_data
@@ -60,12 +60,12 @@ public img_background
 public mem_BACKGROUND
 public sys_background
 public REDRAW_BACKGROUND
-public scheduler_add_thread
-public new_sys_threads
-public osloop
+public new_sys_threads as 'kos_new_sys_threads'
+public osloop as 'kos_osloop'
 public set_mouse_data as 'kos_set_mouse_data'
 public scheduler_current as 'kos_scheduler_current'
 public eth_input as 'kos_eth_input'
+public net_buff_alloc as 'kos_net_buff_alloc'
 
 macro cli {
         pushfd
@@ -288,7 +288,7 @@ proc kos_time_to_epoch c uses ebx esi edi ebp, _time
         ret
 endp
 
-proc kos_init c uses ebx esi edi ebp
+proc umka_init c uses ebx esi edi ebp
         mov     edi, endofcode
         mov     ecx, uglobals_size
         xor     eax, eax
@@ -539,36 +539,20 @@ proc delay_ms
         ret
 endp
 
-;public inject_packet as 'kos_inject_packet'
-public umka_inject_packet
-proc umka_inject_packet c uses ebx esi edi, _data, _size, _dev
-        mov     ebx, [_dev]
-        mov     ecx, [_size]
-        push    ecx
-        add     ecx, NET_BUFF.data
-        stdcall net_buff_alloc, ecx             ; Allocate a buffer to put packet into
-        pop     ecx
-        test    eax, eax                        ; Test if we allocated succesfully
-        jz      .abort
-        mov     [eax + NET_BUFF.length], ecx
-        mov     [eax + NET_BUFF.device], ebx
-        mov     [eax + NET_BUFF.offset], NET_BUFF.data
+public umka_cli
+proc umka_cli
+        cli     ; macro
+        ret
+endp
 
-        lea     edi, [eax + NET_BUFF.data]      ; Where we will copy too
-        mov     esi, [_data]                    ; The buffer we will copy from
-        rep movsb
-
-        push    .abort
-        push    eax                             ; buffer ptr for Eth_input
-
-        jmp     eth_input                     ; Send it to kernel
-.abort:
+public umka_sti
+proc umka_sti
+        sti     ; macro
         ret
 endp
 
 extrn reset_procmask
 extrn get_fake_if
-extrn restart_timer
 public irq0
 proc irq0 c, _signo, _info, _context
         DEBUGF 2, "### irq0\n"
diff --git a/umka.h b/umka.h
index dd4e698..a120f6d 100644
--- a/umka.h
+++ b/umka.h
@@ -346,10 +346,10 @@ typedef struct {
     uint16_t ttl;
 } arp_entry_t;
 
-void osloop(void);
+void kos_osloop(void);
 void irq0(int signo, siginfo_t *info, void *context);
 
-void kos_init(void);
+void umka_init(void);
 void i40(void);
 uint32_t kos_time_to_epoch(uint32_t *time);
 
@@ -380,12 +380,12 @@ static inline void umka_mouse_move(int lbheld, int mbheld, int rbheld,
     kos_set_mouse_data(btn_state, xmoving, ymoving, vscroll, hscroll);
 }
 
-void umka_inject_packet(void *data, size_t size, net_device_t *dev);
+net_buff_t *kos_net_buff_alloc(size_t size) __attribute__((__stdcall__));
 
 static inline void umka_new_sys_threads(uint32_t flags, void (*entry)(), void *stack) {
     __asm__ __inline__ __volatile__ (
         "pushad;"
-        "call   new_sys_threads;"
+        "call   kos_new_sys_threads;"
         "popad"
         :
         : "b"(flags),
@@ -426,10 +426,10 @@ typedef struct {
     uint32_t ebx;
 } f76ret_t;
 
-static inline void kos_stack_init() {
+static inline void umka_stack_init() {
     __asm__ __inline__ __volatile__ (
         "pushad;"
-        "call   stack_init;"
+        "call   kos_stack_init;"
         "popad"
         :
         :
@@ -447,6 +447,9 @@ static inline int32_t kos_net_add_device(net_device_t *dev) {
     return dev_num;
 }
 
+void umka_cli(void);
+void umka_sti(void);
+
 extern uint8_t coverage_begin[];
 extern uint8_t coverage_end[];
 
diff --git a/umka_fuse.c b/umka_fuse.c
index 4091ecb..47e82bd 100644
--- a/umka_fuse.c
+++ b/umka_fuse.c
@@ -51,8 +51,8 @@ static void bdfe_to_stat(bdfe_t *kf, struct stat *st) {
     st->st_ctime = kos_time_to_epoch(&(kf->ctime));
 }
 
-static void *umka_init(struct fuse_conn_info *conn,
-                       struct fuse_config *cfg) {
+static void *umka_fuse_init(struct fuse_conn_info *conn,
+                            struct fuse_config *cfg) {
         (void) conn;
         cfg->kernel_cache = 1;
         return NULL;
@@ -131,7 +131,7 @@ static int umka_read(const char *path, char *buf, size_t size, off_t offset,
 }
 
 static struct fuse_operations umka_oper = {
-    .init           = umka_init,
+    .init           = umka_fuse_init,
     .getattr        = umka_getattr,
     .readdir        = umka_readdir,
     .open           = umka_open,
@@ -144,7 +144,7 @@ int main(int argc, char *argv[]) {
         printf("usage: umka_fuse dir img\n");
         exit(1);
     }
-    kos_init();
+    umka_init();
     void *userdata = vdisk_init(argv[2], 1, 0u);
     void *vdisk = disk_add(&vdisk_functions, "hd0", userdata, 0);
     disk_media_changed(vdisk, 1);
diff --git a/umka_os.c b/umka_os.c
index d5135e1..3b1225a 100644
--- a/umka_os.c
+++ b/umka_os.c
@@ -13,12 +13,7 @@
 #define MONITOR_THREAD_STACK_SIZE 0x100000
 
 void monitor() {
-    __asm__ __inline__ __volatile__ (
-        "pushfd;"
-        "btr dword ptr[esp], 21;"
-        "popfd"
-        : : : "memory");
-
+    umka_sti();
     fprintf(stderr, "Start monitor thread\n");
 //    mkfifo("/tmp/umka.fifo.2u", 0644);
 //    mkfifo("/tmp/umka.fifo.4u", 0644);
@@ -39,12 +34,7 @@ struct itimerval timeout = {.it_value = {.tv_sec = 0, .tv_usec = 10000},
                             .it_interval = {.tv_sec = 0, .tv_usec = 10000}};
 
 int main() {
-    __asm__ __inline__ __volatile__ (
-        "pushfd;"
-        "btr dword ptr[esp], 21;"
-        "popfd"
-        : : : "memory");
-
+    umka_sti();
     umka_tool = UMKA_OS;
 
     struct sigaction sa;
@@ -57,7 +47,6 @@ int main() {
         return 1;
     }
 
-
 /*
     void *app_base = mmap((void*)0x000000, 16*0x100000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (app_base == MAP_FAILED) {
@@ -67,8 +56,8 @@ int main() {
 */
     printf("pid=%d, kos_lfb_base=%p\n", getpid(), (void*)kos_lfb_base);
 
-    kos_init();
-    kos_stack_init();
+    umka_init();
+    umka_stack_init();
     uint8_t *monitor_stack = malloc(MONITOR_THREAD_STACK_SIZE);
     umka_new_sys_threads(0, monitor, monitor_stack + MONITOR_THREAD_STACK_SIZE);
 
@@ -80,7 +69,7 @@ int main() {
 
     setitimer(ITIMER_PROF, &timeout, NULL);
 
-    osloop();   // doesn't return
+    kos_osloop();   // doesn't return
 
     return 0;
 }
diff --git a/umka_ping.c b/umka_ping.c
index 81c1bf1..caa96fe 100644
--- a/umka_ping.c
+++ b/umka_ping.c
@@ -83,12 +83,7 @@ int tapfd;
 _Atomic int go_ping = 0;
 
 int umka_thread_ping(void) {
-    __asm__ __inline__ __volatile__ (
-        "pushfd;"
-        "btr dword ptr[esp], 21;"
-        "popfd"
-        : : : "memory");
-
+    umka_sti();
     while (!go_ping) { /* wait until initialized */ }
     fprintf(stderr, "[ping] tapfd is %i\n", tapfd);
 
@@ -135,26 +130,19 @@ int umka_thread_ping(void) {
     return 0;
 }
 
-uint8_t buffer[2*1024];
-int plen = 0;
-
 void umka_thread_net_drv(void) {
-    __asm__ __inline__ __volatile__ (
-        "pushfd;"
-        "btr dword ptr[esp], 21;"
-        "popfd"
-        : : : "memory");
-
+    umka_sti();
     fprintf(stderr, "[net_drv] starting\n");
+    uint8_t buffer[2048];
+    int plen = 0;
     char tapdev[IFNAMSIZ] = "tap0";
     tapfd = tap_alloc(tapdev);
     net_device_t *vnet = vnet_init(tapfd);
     kos_net_add_device(vnet);
-    umka_sys_net_dev_reset(1);
 
     char devname[64];
     for (size_t i = 0; i < umka_sys_net_get_dev_count(); i++) {
-//        umka_sys_net_dev_reset(i);
+        umka_sys_net_dev_reset(i);
         umka_sys_net_get_dev_name(i, devname);
         uint32_t devtype = umka_sys_net_get_dev_type(i);
         printf("[net_drv] device %i: %s %u\n", i, devname, devtype);
@@ -197,7 +185,7 @@ void umka_thread_net_drv(void) {
                 fprintf(stderr, " %2.2x", buffer[i]);
             }
             fprintf(stderr, "\n");
-            umka_inject_packet(buffer, plen, vnet);
+            vnet_receive_frame(vnet, buffer, plen);
         } else if(plen == -1 && (errno == EAGAIN || errno == EINTR)) {
             continue;
         } else {
diff --git a/umka_shell.c b/umka_shell.c
index 391b52e..2a72ac9 100644
--- a/umka_shell.c
+++ b/umka_shell.c
@@ -77,7 +77,7 @@ int main(int argc, char **argv) {
         trace_begin();
 
     COVERAGE_ON();
-    kos_init();
+    umka_init();
     COVERAGE_OFF();
 
     run_test(fin, fout, 1);
diff --git a/vnet.c b/vnet.c
index 1d8e967..7089aed 100644
--- a/vnet.c
+++ b/vnet.c
@@ -83,3 +83,25 @@ int vnet_transmit(net_buff_t *buf) {
     return 0;
 }
 
+void vnet_receive_frame(net_device_t *dev, void *data, size_t size) {
+    net_buff_t *buf = kos_net_buff_alloc(size + offsetof(net_buff_t, data));
+    if (!buf) {
+        fprintf(stderr, "[vnet] Can't allocate network buffer!\n");
+        return;
+    }
+    buf->length = size;
+    buf->device = dev;
+    buf->offset = offsetof(net_buff_t, data);
+    memcpy(buf->data, data, size);
+    __asm__ __inline__ __volatile__ (
+        "pushad;"
+        "lea    ecx, 1f;"
+        "push   ecx;"
+        "push   eax;"
+        "jmp    kos_eth_input;"
+        "1:"
+        "popad"
+        :
+        : "a"(buf)
+        : "memory", "ecx");
+}
diff --git a/vnet.h b/vnet.h
index ff51eff..43664ab 100644
--- a/vnet.h
+++ b/vnet.h
@@ -16,4 +16,6 @@ void vnet_reset(void);
 __attribute__((__stdcall__))
 int vnet_transmit(net_buff_t *buf);
 
+void vnet_receive_frame(net_device_t *dev, void *data, size_t size);
+
 #endif  // VNET_H_INCLUDED