diff --git a/linux/io.c b/linux/io.c
index 4f4db58..db067c3 100644
--- a/linux/io.c
+++ b/linux/io.c
@@ -7,9 +7,31 @@
     Copyright (C) 2023  Ivan Baravy <dunkaist@gmail.com>
 */
 
+#include <stdlib.h>
 #include <unistd.h>
 #include "io.h"
 
+struct umka_io {
+    int change_task;
+    int uring_fd;
+};
+
+void *
+io_init(int change_task) {
+    struct umka_io *io = malloc(sizeof(struct umka_io));
+    io->change_task = change_task;
+    if (change_task) {
+        io->uring_fd = 1;
+    }
+    return io;
+}
+
+void
+io_close(void *userdata) {
+    struct umka_io *io = (struct umka_io*)userdata;
+    free(io);
+}
+
 ssize_t
 io_read(int fd, void *buf, size_t count, int change_task) {
     (void)change_task;
diff --git a/shell.c b/shell.c
index eb9f0f9..3ac3a51 100644
--- a/shell.c
+++ b/shell.c
@@ -408,14 +408,27 @@ static void
 cmd_umka_init(struct shell_ctx *ctx, int argc, char **argv) {
     (void)ctx;
     const char *usage = \
-        "usage: umka_init";
-    (void)argv;
-    if (argc != 1) {
+        "usage: umka_init <tool>\n"
+        "  <tool>           number or string: 1=shell, 2=fuse, 3=os";
+    if (argc != 2) {
         puts(usage);
         return;
     }
+    const char *tool_str = argv[1];
+    unsigned tool;
+    if (!strcmp(tool_str, "1") || !strcmp(tool_str, "shell")) {
+        tool = UMKA_SHELL;
+    } else if (!strcmp(tool_str, "2") || !strcmp(tool_str, "fuse")) {
+        tool = UMKA_FUSE;
+    } else if (!strcmp(tool_str, "3") || !strcmp(tool_str, "os")) {
+        tool = UMKA_OS;
+    } else {
+        printf("[!] bad tool value: '%s'\n", tool_str);
+        return;
+    }
+
     COVERAGE_ON();
-    umka_init();
+    umka_init(tool);
     COVERAGE_OFF();
 }
 
diff --git a/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.ref.log b/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.ref.log
index 6a16f61..c62b6a7 100644
--- a/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.ref.log
+++ b/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 0
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.t b/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.t
index f9af915..a8b3c30 100644
--- a/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.t
+++ b/test/001_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype1.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 0
 disk_add ../img/xfs_short_dir_i8.qcow2 hd1 -c 0
 
diff --git a/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.ref.log b/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.ref.log
index 84bff88..7837864 100644
--- a/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.ref.log
+++ b/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.t b/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.t
index 548f9e0..27057a1 100644
--- a/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.t
+++ b/test/002_#f70_#f70s1_#xfs_#s05k_ls_all_dir_types_ftype0.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k.qcow2 hd0 -c 524288
 ls70 /hd0/1/sf_empty
 ls70 /hd0/1/sf
diff --git a/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.ref.log b/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.ref.log
index 741e127..68e1922 100644
--- a/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.ref.log
+++ b/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.t b/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.t
index 7e64389..edec23b 100644
--- a/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.t
+++ b/test/003_#f70_#f70s0_#xfs_#s05k_read_without_holes.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 # zero length
 read70 /hd0/1/no_hole 0 0 -b
diff --git a/test/004_#f70_#f70s5_#xfs_stat.ref.log b/test/004_#f70_#f70s5_#xfs_stat.ref.log
index 57a1080..82d592d 100644
--- a/test/004_#f70_#f70s5_#xfs_stat.ref.log
+++ b/test/004_#f70_#f70s5_#xfs_stat.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/004_#f70_#f70s5_#xfs_stat.t b/test/004_#f70_#f70s5_#xfs_stat.t
index 51746c8..20a9048 100644
--- a/test/004_#f70_#f70s5_#xfs_stat.t
+++ b/test/004_#f70_#f70s5_#xfs_stat.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 stat70 /hd0/1/
 stat70 /hd0/1/hole_begin
diff --git a/test/005_#f30_#xfs_cur_dir.ref.log b/test/005_#f30_#xfs_cur_dir.ref.log
index 6e2ef21..3596891 100644
--- a/test/005_#f30_#xfs_cur_dir.ref.log
+++ b/test/005_#f30_#xfs_cur_dir.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/005_#f30_#xfs_cur_dir.t b/test/005_#f30_#xfs_cur_dir.t
index 164aee5..882b4ca 100644
--- a/test/005_#f30_#xfs_cur_dir.t
+++ b/test/005_#f30_#xfs_cur_dir.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 pwd
 cd /hd0
diff --git a/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.ref.log b/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.ref.log
index e3654a5..2692088 100644
--- a/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.ref.log
+++ b/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.t b/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.t
index 49dd35c..de3495f 100644
--- a/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.t
+++ b/test/006_#f70_#f70s0_#xfs_#s05k_read_with_holes.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 # hole begin
 # zero length
diff --git a/test/007_#f70_#xfs_#lookup_all.ref.log b/test/007_#f70_#xfs_#lookup_all.ref.log
index 609a8d6..78758ae 100644
--- a/test/007_#f70_#xfs_#lookup_all.ref.log
+++ b/test/007_#f70_#xfs_#lookup_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/007_#f70_#xfs_#lookup_all.t b/test/007_#f70_#xfs_#lookup_all.t
index bdf3a54..0bb5f82 100644
--- a/test/007_#f70_#xfs_#lookup_all.t
+++ b/test/007_#f70_#xfs_#lookup_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 stat70 /hd0/1/sf_empty
 stat70 /hd0/1/sf_empty/.
diff --git a/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.ref.log b/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.ref.log
index 1a0598c..26d42b2 100644
--- a/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.ref.log
+++ b/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype0_s4k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=4096, capacity=77312 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=256 (1 MiB), length=76800 (300 MiB)
diff --git a/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.t b/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.t
index 0b26801..3287c6b 100644
--- a/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.t
+++ b/test/008_#f70_#f70s1_#xfs_#s4k_ls_all_dir_types_ftype0.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype0_s4k_b4k_n8k.qcow2 hd0 -c 524288
 ls70 /hd0/1/sf
 ls70 /hd0/1/block
diff --git a/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.ref.log b/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.ref.log
index 04eea59..b595df6 100644
--- a/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.ref.log
+++ b/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k_xattr.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.t b/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.t
index 2a34000..13d9d06 100644
--- a/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.t
+++ b/test/009_#f70_#f70s0_#f70s1_#xfs_#s05k_#xattr.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k_xattr.qcow2 hd0 -c 524288
 ls70 /hd0/1/sf_empty
 ls70 /hd0/1/sf
diff --git a/test/010_#f70_#xfs_#lookup_#xattr_all.ref.log b/test/010_#f70_#xfs_#lookup_#xattr_all.ref.log
index 4ef32ce..163401c 100644
--- a/test/010_#f70_#xfs_#lookup_#xattr_all.ref.log
+++ b/test/010_#f70_#xfs_#lookup_#xattr_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k_xattr.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/010_#f70_#xfs_#lookup_#xattr_all.t b/test/010_#f70_#xfs_#lookup_#xattr_all.t
index 5bed320..dd5e09b 100644
--- a/test/010_#f70_#xfs_#lookup_#xattr_all.t
+++ b/test/010_#f70_#xfs_#lookup_#xattr_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_ftype0_s05k_b2k_n8k_xattr.qcow2 hd0 -c 524288
 stat70 /hd0/1/sf_empty
 stat70 /hd0/1/sf_empty/.
diff --git a/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.ref.log b/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.ref.log
index 51b98af..e4b2eae 100644
--- a/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.ref.log
+++ b/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_unicode.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.t b/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.t
index 456b31e..63fab1b 100644
--- a/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.t
+++ b/test/011_#f70_#f70s1_#xfs_#lookup_#unicode_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_unicode.qcow2 hd0 -c 524288
 
 stat80 /hd0/1/dir0
diff --git a/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.ref.log b/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.ref.log
index 341c971..54d8026 100644
--- a/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.ref.log
+++ b/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v5_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.t b/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.t
index 2ec8c52..228fbc9 100644
--- a/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.t
+++ b/test/012_#f70_#f70s1_#xfs_#v5_#s05k_ls_all_dir_types_ftype1.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v5_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 ls70 /hd0/1/sf_empty
 ls70 /hd0/1/sf
diff --git a/test/013_#f70_#xfs_#v5_#lookup_all.ref.log b/test/013_#f70_#xfs_#v5_#lookup_all.ref.log
index aa57633..fb4cf5a 100644
--- a/test/013_#f70_#xfs_#v5_#lookup_all.ref.log
+++ b/test/013_#f70_#xfs_#v5_#lookup_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v5_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/013_#f70_#xfs_#v5_#lookup_all.t b/test/013_#f70_#xfs_#v5_#lookup_all.t
index fda5457..edf0595 100644
--- a/test/013_#f70_#xfs_#v5_#lookup_all.t
+++ b/test/013_#f70_#xfs_#v5_#lookup_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v5_ftype1_s05k_b2k_n8k.qcow2 hd0 -c 524288
 stat70 /hd0/1/sf_empty
 stat70 /hd0/1/sf_empty/.
diff --git a/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.ref.log b/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.ref.log
index 2ec6f74..729c574 100644
--- a/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.ref.log
+++ b/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v5_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.t b/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.t
index bd32ff1..53e3291 100644
--- a/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.t
+++ b/test/014_#f70_#f70s0_#xfs_#v5_#s05k_read_with_holes.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v5_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 # hole begin
 # zero length
diff --git a/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.ref.log b/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.ref.log
index acd0c80..0e01031 100644
--- a/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.ref.log
+++ b/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v5_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.t b/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.t
index 329d8b5..7b1e315 100644
--- a/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.t
+++ b/test/015_#f70_#f70s0_#xfs_#v5_#s05k_read_without_holes.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v5_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 # zero length
 read70 /hd0/1/no_hole 0 0 -b
diff --git a/test/016_#f01_#draw_all.ref.log b/test/016_#f01_#draw_all.ref.log
index fc91d16..3446522 100644
--- a/test/016_#f01_#draw_all.ref.log
+++ b/test/016_#f01_#draw_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> set_mouse_pos_screen 40 30
 /> #disk_add ../img/kolibri.raw rd -c 0
 /> ramdisk_init ../img/kolibri.raw
diff --git a/test/016_#f01_#draw_all.t b/test/016_#f01_#draw_all.t
index b3e042b..2067325 100644
--- a/test/016_#f01_#draw_all.t
+++ b/test/016_#f01_#draw_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 set_mouse_pos_screen 40 30
 #disk_add ../img/kolibri.raw rd -c 0
 ramdisk_init ../img/kolibri.raw
diff --git a/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.ref.log b/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.ref.log
index 9c5592d..f4c7400 100644
--- a/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.ref.log
+++ b/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.t b/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.t
index af0d21a..dafdc70 100644
--- a/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.t
+++ b/test/017_#f70_#f70s0_#xfs_#s05k_read_above_4GiB.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_files_s05k_b4k_n8k.qcow2 hd0 -c 524288
 
 read70 /hd0/1/4GiB_plus 0x3ff4 11 -b
diff --git a/test/018_#xfs_#coverage_all.ref.log b/test/018_#xfs_#coverage_all.ref.log
index ffbb8cb..b05b12d 100644
--- a/test/018_#xfs_#coverage_all.ref.log
+++ b/test/018_#xfs_#coverage_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/jfs.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=32768 (16 MiB), num_partitions=1
 /hd0/1: fs=???, start=2048 (1 MiB), length=28672 (14 MiB)
diff --git a/test/018_#xfs_#coverage_all.t b/test/018_#xfs_#coverage_all.t
index fe8ace1..4f8f465 100644
--- a/test/018_#xfs_#coverage_all.t
+++ b/test/018_#xfs_#coverage_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/jfs.qcow2 hd0 -c 524288
 disk_del hd0
 disk_add ../img/xfs_borg_bit.qcow2 hd0 -c 524288
diff --git a/test/019_#xfs_deep_btree.ref.log b/test/019_#xfs_deep_btree.ref.log
index fd9f688..764cfee 100644
--- a/test/019_#xfs_deep_btree.ref.log
+++ b/test/019_#xfs_deep_btree.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_v4_btrees_l2.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/019_#xfs_deep_btree.t b/test/019_#xfs_deep_btree.t
index c2ccaf6..9a02953 100644
--- a/test/019_#xfs_deep_btree.t
+++ b/test/019_#xfs_deep_btree.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_v4_btrees_l2.qcow2 hd0 -c 524288
 
 ls80 /hd0/1/dir_btree_l2 -f 0 -c 1
diff --git a/test/021_#i40_all.ref.log b/test/021_#i40_all.ref.log
index f97cef4..97c27c3 100644
--- a/test/021_#i40_all.ref.log
+++ b/test/021_#i40_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> i40 18 16
 eax = 00040000  262144  262144
 ebx = 00000010  16  16
diff --git a/test/021_#i40_all.t b/test/021_#i40_all.t
index 61ad73d..266b2eb 100644
--- a/test/021_#i40_all.t
+++ b/test/021_#i40_all.t
@@ -1,2 +1,2 @@
-umka_init
+umka_init shell
 i40 18 16
diff --git a/test/044_#f01_#draw_winmap.ref.log b/test/044_#f01_#draw_winmap.ref.log
index 0b0e8ea..44f09c4 100644
--- a/test/044_#f01_#draw_winmap.ref.log
+++ b/test/044_#f01_#draw_winmap.ref.log
@@ -1,5 +1,5 @@
 /> umka_set_boot_params --x_res 44 --y_res 44
-/> umka_init
+/> umka_init shell
 /> ramdisk_init ../img/kolibri.raw
 /rd: sector_size=512, capacity=2880 (1440 kiB), num_partitions=1
 /rd/1: fs=fat, start=0 (0 B), length=2880 (1440 kiB)
diff --git a/test/044_#f01_#draw_winmap.t b/test/044_#f01_#draw_winmap.t
index 66901e0..04b8eb9 100644
--- a/test/044_#f01_#draw_winmap.t
+++ b/test/044_#f01_#draw_winmap.t
@@ -1,5 +1,5 @@
 umka_set_boot_params --x_res 44 --y_res 44
-umka_init
+umka_init shell
 ramdisk_init ../img/kolibri.raw
 set_skin /sys/DEFAULT.SKN
 
diff --git a/test/045_#f70_#fat32_test0.ref.log b/test/045_#f70_#fat32_test0.ref.log
index 923e8a1..9054f64 100644
--- a/test/045_#f70_#fat32_test0.ref.log
+++ b/test/045_#f70_#fat32_test0.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/fat32_test0.raw hd0 -c 0
 /hd0: sector_size=512, capacity=131072 (64 MiB), num_partitions=1
 /hd0/1: fs=fat, start=2048 (1 MiB), length=126976 (62 MiB)
diff --git a/test/045_#f70_#fat32_test0.t b/test/045_#f70_#fat32_test0.t
index 2b67a6f..f5a630e 100644
--- a/test/045_#f70_#fat32_test0.t
+++ b/test/045_#f70_#fat32_test0.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/fat32_test0.raw hd0 -c 0
 ls80 /hd0/1/
 read70 /hd0/1/A 0 16388096 -h
diff --git a/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.ref.log b/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.ref.log
index b6ef04e..b9dad9e 100644
--- a/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.ref.log
+++ b/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/exfat_s05k_c16k_b16k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=exfat, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.t b/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.t
index d82d876..0cc5f6a 100644
--- a/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.t
+++ b/test/046_#f70_#f70s1_#fat_#exfat_#s05k_ls.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/exfat_s05k_c16k_b16k.qcow2 hd0 -c 524288
 
 ls70 /hd0/1/dir_0 -f 0 -c 0
diff --git a/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.ref.log b/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.ref.log
index 5718dfb..f1b8547 100644
--- a/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.ref.log
+++ b/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/exfat_s05k_c8k_b8k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=exfat, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.t b/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.t
index 0378cf6..e29dc04 100644
--- a/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.t
+++ b/test/047_#f70_#f70s1_#fat_#exfat_#s05k_stat.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/exfat_s05k_c8k_b8k.qcow2 hd0 -c 524288
 
 stat70 /hd0/1/dir_000
diff --git a/test/049_#keyboard_#input_all.ref.log b/test/049_#keyboard_#input_all.ref.log
index 97c0fb1..f8787d0 100644
--- a/test/049_#keyboard_#input_all.ref.log
+++ b/test/049_#keyboard_#input_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> 
 /> get_keyboard_mode
 keyboard_mode: 0 - ASCII
diff --git a/test/049_#keyboard_#input_all.t b/test/049_#keyboard_#input_all.t
index 9bafbb1..e02868d 100644
--- a/test/049_#keyboard_#input_all.t
+++ b/test/049_#keyboard_#input_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 
 get_keyboard_mode
 get_keyboard_lang
diff --git a/test/050_#mouse_#input_all.ref.log b/test/050_#mouse_#input_all.ref.log
index f98495c..364fdc8 100644
--- a/test/050_#mouse_#input_all.ref.log
+++ b/test/050_#mouse_#input_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> 
 /> get_mouse_pos_screen
 x y: 200 150
diff --git a/test/050_#mouse_#input_all.t b/test/050_#mouse_#input_all.t
index 38cec5c..2dafb99 100644
--- a/test/050_#mouse_#input_all.t
+++ b/test/050_#mouse_#input_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 
 get_mouse_pos_screen
 get_mouse_pos_window
diff --git a/test/051_#draw_#cursor_all.ref.log b/test/051_#draw_#cursor_all.ref.log
index 149dcf8..3f062bb 100644
--- a/test/051_#draw_#cursor_all.ref.log
+++ b/test/051_#draw_#cursor_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> #set_mouse_pos_screen 40 30
 /> ramdisk_init ../img/kolibri.raw
 /rd: sector_size=512, capacity=2880 (1440 kiB), num_partitions=1
diff --git a/test/051_#draw_#cursor_all.t b/test/051_#draw_#cursor_all.t
index 0399730..9892ab6 100644
--- a/test/051_#draw_#cursor_all.t
+++ b/test/051_#draw_#cursor_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 #set_mouse_pos_screen 40 30
 ramdisk_init ../img/kolibri.raw
 set_skin /sys/DEFAULT.SKN
diff --git a/test/053_#userevent_all.t b/test/053_#userevent_all.t
index 882c32f..b567a23 100644
--- a/test/053_#userevent_all.t
+++ b/test/053_#userevent_all.t
@@ -1,3 +1,3 @@
-umka_init
+umka_init shell
 check_for_event
 check_for_event
diff --git a/test/054_#draw_#cursor_#osloop_resize.ref.log b/test/054_#draw_#cursor_#osloop_resize.ref.log
index 4847088..c972502 100644
--- a/test/054_#draw_#cursor_#osloop_resize.ref.log
+++ b/test/054_#draw_#cursor_#osloop_resize.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> 
 /> ramdisk_init ../img/kolibri.raw
 /rd: sector_size=512, capacity=2880 (1440 kiB), num_partitions=1
diff --git a/test/054_#draw_#cursor_#osloop_resize.t b/test/054_#draw_#cursor_#osloop_resize.t
index e6a2991..53fcf9b 100644
--- a/test/054_#draw_#cursor_#osloop_resize.t
+++ b/test/054_#draw_#cursor_#osloop_resize.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 
 ramdisk_init ../img/kolibri.raw
 set_skin /sys/DEFAULT.SKN
diff --git a/test/055_#xfs_#bigtime_all.ref.log b/test/055_#xfs_#bigtime_all.ref.log
index 0fdf72d..f64f597 100644
--- a/test/055_#xfs_#bigtime_all.ref.log
+++ b/test/055_#xfs_#bigtime_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_bigtime.qcow2 hd0 -c 0
 /hd0: sector_size=512, capacity=618496 (302 MiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=614400 (300 MiB)
diff --git a/test/055_#xfs_#bigtime_all.t b/test/055_#xfs_#bigtime_all.t
index 7a5b3ec..de6b06c 100644
--- a/test/055_#xfs_#bigtime_all.t
+++ b/test/055_#xfs_#bigtime_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_bigtime.qcow2 hd0 -c 0
 ls70 /hd0/1/
 ls70 /hd0/1/dira
diff --git a/test/056_#xfs_#nrext64_all.ref.log b/test/056_#xfs_#nrext64_all.ref.log
index 8cddf47..3f67884 100644
--- a/test/056_#xfs_#nrext64_all.ref.log
+++ b/test/056_#xfs_#nrext64_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_nrext64.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=6291456 (3 GiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=6287360 (3070 MiB)
diff --git a/test/056_#xfs_#nrext64_all.t b/test/056_#xfs_#nrext64_all.t
index 3c354e2..641c21a 100644
--- a/test/056_#xfs_#nrext64_all.t
+++ b/test/056_#xfs_#nrext64_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_nrext64.qcow2 hd0 -c 524288
 stat70 /hd0/1/dir_sf
 stat70 /hd0/1/dir_block
diff --git a/test/057_#xfs_#lookup_#v5_all.ref.log b/test/057_#xfs_#lookup_#v5_all.ref.log
index 8cdbbad..f363ce2 100644
--- a/test/057_#xfs_#lookup_#v5_all.ref.log
+++ b/test/057_#xfs_#lookup_#v5_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_lookup_v5.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=10485760 (5 GiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=10481664 (5118 MiB)
diff --git a/test/057_#xfs_#lookup_#v5_all.t b/test/057_#xfs_#lookup_#v5_all.t
index 3006fb7..fa8263b 100644
--- a/test/057_#xfs_#lookup_#v5_all.t
+++ b/test/057_#xfs_#lookup_#v5_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_lookup_v5.qcow2 hd0 -c 524288
 cd /hd0/1/dir_sf
 stat70 d0000000000/d0000000000
diff --git a/test/058_#xfs_#lookup_#v4_all.ref.log b/test/058_#xfs_#lookup_#v4_all.ref.log
index 0adb7bf..c39bc26 100644
--- a/test/058_#xfs_#lookup_#v4_all.ref.log
+++ b/test/058_#xfs_#lookup_#v4_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_lookup_v4.qcow2 hd0 -c 1048576
 /hd0: sector_size=512, capacity=6291456 (3 GiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=6287360 (3070 MiB)
diff --git a/test/058_#xfs_#lookup_#v4_all.t b/test/058_#xfs_#lookup_#v4_all.t
index 65afcf2..028b455 100644
--- a/test/058_#xfs_#lookup_#v4_all.t
+++ b/test/058_#xfs_#lookup_#v4_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_lookup_v4.qcow2 hd0 -c 1048576
 cd /hd0/1/dir_sf
 stat70 d0000000000/d0000000000
diff --git a/test/059_#gpt_all.ref.log b/test/059_#gpt_all.ref.log
index 1827f3a..c32e86b 100644
--- a/test/059_#gpt_all.ref.log
+++ b/test/059_#gpt_all.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/gpt_partitions_s05k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=2097152 (1 GiB), num_partitions=24
 /hd0/1: fs=???, start=2048 (1 MiB), length=2048 (1 MiB)
diff --git a/test/059_#gpt_all.t b/test/059_#gpt_all.t
index 8422670..dc5a82a 100644
--- a/test/059_#gpt_all.t
+++ b/test/059_#gpt_all.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/gpt_partitions_s05k.qcow2 hd0 -c 524288
 disk_del hd0
 disk_add ../img/gpt_partitions_s4k.qcow2 hd0 -c 524288
diff --git a/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.ref.log b/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.ref.log
index 0ab7756..e5abf63 100644
--- a/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.ref.log
+++ b/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/ext2_s05k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=10485760 (5 GiB), num_partitions=1
 /hd0/1: fs=ext, start=2048 (1 MiB), length=10481664 (5118 MiB)
diff --git a/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.t b/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.t
index 4c65830..ece9d0c 100644
--- a/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.t
+++ b/test/060_#f70_#f70s1_#ext_#ext2_#s05k_ls_all_dir_types.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/ext2_s05k.qcow2 hd0 -c 524288
 ls70 /hd0/1/dir_a
 ls70 /hd0/1/dir_b
diff --git a/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.ref.log b/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.ref.log
index 445b58f..91c75ae 100644
--- a/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.ref.log
+++ b/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/ext4_s05k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=10485760 (5 GiB), num_partitions=1
 /hd0/1: fs=???, start=2048 (1 MiB), length=10481664 (5118 MiB)
diff --git a/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.t b/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.t
index 461ef5a..e4ba9c9 100644
--- a/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.t
+++ b/test/061_#f70_#f70s1_#ext_#ext4_#s05k_ls_all_dir_types.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/ext4_s05k.qcow2 hd0 -c 524288
 ls70 /hd0/1/dir_a
 ls70 /hd0/1/dir_b
diff --git a/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.ref.log b/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.ref.log
index df17259..44e96e8 100644
--- a/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.ref.log
+++ b/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/fat12_s05k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=524288 (256 MiB), num_partitions=1
 /hd0/1: fs=fat, start=2048 (1 MiB), length=520192 (254 MiB)
diff --git a/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.t b/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.t
index cd4756e..e9e740f 100644
--- a/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.t
+++ b/test/062_#f70_#f70s1_#fat_#fat12_#s05k_ls_all_dir_types.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/fat12_s05k.qcow2 hd0 -c 524288
 ls70 /hd0/1/dir_a
 ls70 /hd0/1/dir_b
diff --git a/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.ref.log b/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.ref.log
index 1d3287c..4f2ea1e 100644
--- a/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.ref.log
+++ b/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/fat16_s05k.qcow2 hd0 -c 524288
 /hd0: sector_size=512, capacity=8388608 (4 GiB), num_partitions=1
 /hd0/1: fs=fat, start=2048 (1 MiB), length=8384481 (4292854272 B)
diff --git a/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.t b/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.t
index f21712d..d4590f3 100644
--- a/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.t
+++ b/test/063_#f70_#f70s1_#fat_#fat16_#s05k_ls_all_dir_types.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/fat16_s05k.qcow2 hd0 -c 524288
 ls70 /hd0/1/dir_a
 ls70 /hd0/1/dir_b
diff --git a/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.ref.log b/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.ref.log
index 282652a..573cb81 100644
--- a/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.ref.log
+++ b/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.ref.log
@@ -1,4 +1,4 @@
-/> umka_init
+/> umka_init shell
 /> disk_add ../img/xfs_samehash_s05k.raw hd0 -c 0
 /hd0: sector_size=512, capacity=2097152 (1 GiB), num_partitions=1
 /hd0/1: fs=xfs, start=2048 (1 MiB), length=2093056 (1022 MiB)
diff --git a/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.t b/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.t
index 4a03db3..028ac4f 100644
--- a/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.t
+++ b/test/064_#f70_#f70s1_#xfs_#xfsv5_#s05k_#samehash_ls_all_dir_types.t
@@ -1,4 +1,4 @@
-umka_init
+umka_init shell
 disk_add ../img/xfs_samehash_s05k.raw hd0 -c 0
 ls70 /hd0/1/dir_sf
 ls70 /hd0/1/dir_block
diff --git a/umka.asm b/umka.asm
index 4b3d25e..c338a02 100644
--- a/umka.asm
+++ b/umka.asm
@@ -555,7 +555,9 @@ proc kos_eth_input c uses ebx esi edi ebp, buffer_ptr
         ret
 endp
 
-proc umka_init c uses ebx esi edi ebp
+proc umka_init c uses ebx esi edi ebp, _tool
+        mov     eax, [_tool]
+        mov     [umka_tool], eax
         mov     [umka_initialized], 1
         call    umka._.check_alignment
 
diff --git a/umka.h b/umka.h
index 4bc7b81..60af83b 100644
--- a/umka.h
+++ b/umka.h
@@ -533,7 +533,7 @@ void
 irq0(int signo, siginfo_t *info, void *context);
 
 void
-umka_init(void);
+umka_init(int tool);
 
 void
 i40(void);
@@ -1037,9 +1037,10 @@ typedef struct {
 
 _Static_assert(sizeof(appdata_t) == 256, "must be 0x100 bytes long");
 
-#define UMKA_SHELL 1u
-#define UMKA_FUSE  2u
-#define UMKA_OS    3u
+#define UMKA_SHELL           1
+#define UMKA_FUSE            2
+#define UMKA_OS              3
+#define UMKA_GEN_DEVICES_DAT 4
 
 #define MAX_PRIORITY    0 // highest, used for kernel tasks
 #define USER_PRIORITY   1 // default
diff --git a/umka_fuse.c b/umka_fuse.c
index 5bbb4a2..02078b9 100644
--- a/umka_fuse.c
+++ b/umka_fuse.c
@@ -150,7 +150,7 @@ main(int argc, char *argv[]) {
     kos_boot.y_res = UMKA_DEFAULT_DISPLAY_HEIGHT;
     kos_boot.pitch = UMKA_DEFAULT_DISPLAY_WIDTH*4;  // 32bpp
 
-    umka_init();
+    umka_init(UMKA_FUSE);
     struct vdisk *umka_disk = vdisk_init(argv[2], 1, 0u, 0);
     disk_t *disk = disk_add(&umka_disk->diskfunc, "hd0", umka_disk, 0);
     disk_media_changed(disk, 1);
diff --git a/umka_gen_devices_dat.c b/umka_gen_devices_dat.c
index 0821c02..dd0fa8b 100644
--- a/umka_gen_devices_dat.c
+++ b/umka_gen_devices_dat.c
@@ -150,7 +150,7 @@ main () {
 
     strcpy(pci_path, PCI_BASE_DIR);
 
-    umka_init();
+    umka_init(UMKA_GEN_DEVICES_DAT);
     kos_acpi_aml_init();
     ctx = kos_acpi_aml_new_thread();
     kos_acpi_dev_size = MAX_PCI_DEVICES*16;