diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/.vscode/settings.json b/.vscode/settings.json
index fadddf4..ffad315 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,4 +1,7 @@
 {
   "rust-analyzer.cargo.target": "x86_64-unknown-none",
   "rust-analyzer.check.allTargets": false,
+  "nixEnvPicker.terminalActivateCommand": "nix-shell",
+  "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix",
+  "nixEnvSelector.useFlakes": false,
 }
diff --git a/kernel/src/arch/x86_64/asm.rs b/kernel/src/arch/x86_64/asm.rs
index 5a70055..180ed09 100644
--- a/kernel/src/arch/x86_64/asm.rs
+++ b/kernel/src/arch/x86_64/asm.rs
@@ -11,10 +11,12 @@ pub fn nop() {
 
 pub fn long_mode() -> bool {
     let mut output: u32;
-    unsafe { asm!(
-        "mov eax, 0x80000001",
-        "cpuid",
-        out("edx") output,
-    ) }
+    unsafe {
+        asm!(
+            "mov eax, 0x80000001",
+            "cpuid",
+            out("edx") output,
+        )
+    }
     output.bit(29)
-}
\ No newline at end of file
+}
diff --git a/kernel/src/arch/x86_64/gdt.rs b/kernel/src/arch/x86_64/gdt.rs
index 54d9651..0503439 100644
--- a/kernel/src/arch/x86_64/gdt.rs
+++ b/kernel/src/arch/x86_64/gdt.rs
@@ -8,8 +8,8 @@ use intbits::Bits;
 use x86_64::structures::gdt;
 use x86_64::structures::gdt::*;
 
-use crate::log_info;
 use crate::log::*;
+use crate::log_info;
 use crate::memory::alloc::format;
 
 #[allow(dead_code)]
@@ -74,7 +74,6 @@ pub fn dump_gdt() {
             entry.access()
         );
     }
-
 }
 
 #[derive(Debug)]
@@ -97,20 +96,32 @@ impl TryFrom<&gdt::Entry> for SegmentType {
         let flags = x86_64::structures::gdt::DescriptorFlags::from_bits_retain(value.raw());
         if value.access().bit(4) {
             if value.access().bit(3) {
-                    Ok(SegmentType::Code)
-                } else {
-                    Ok(SegmentType::Data)
-                }
+                Ok(SegmentType::Code)
             } else {
-                match value.access().bits(0..=3) {
-                    0b0000 => Ok(SegmentType::Null),
-                    0b0001 => Ok(SegmentType::Tss16Avail),
-                    0b0010 => Ok(SegmentType::Ldt),
-                    0b0011 => Ok(SegmentType::Tss16Busy),
-                    0b1001 => {if flags.contains(gdt::DescriptorFlags::LONG_MODE) { Ok(SegmentType::Tss64Avail) } else { Ok(SegmentType::Tss32Avail) }},
-                    0b1011 => {if flags.contains(gdt::DescriptorFlags::LONG_MODE) { Ok(SegmentType::Tss64Busy) } else { Ok(SegmentType::Tss32Busy) }},
-                    _ => Err(()),
-                }
+                Ok(SegmentType::Data)
             }
+        } else {
+            match value.access().bits(0..=3) {
+                0b0000 => Ok(SegmentType::Null),
+                0b0001 => Ok(SegmentType::Tss16Avail),
+                0b0010 => Ok(SegmentType::Ldt),
+                0b0011 => Ok(SegmentType::Tss16Busy),
+                0b1001 => {
+                    if flags.contains(gdt::DescriptorFlags::LONG_MODE) {
+                        Ok(SegmentType::Tss64Avail)
+                    } else {
+                        Ok(SegmentType::Tss32Avail)
+                    }
+                }
+                0b1011 => {
+                    if flags.contains(gdt::DescriptorFlags::LONG_MODE) {
+                        Ok(SegmentType::Tss64Busy)
+                    } else {
+                        Ok(SegmentType::Tss32Busy)
+                    }
+                }
+                _ => Err(()),
+            }
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/kernel/src/main.rs b/kernel/src/main.rs
index 1a84a86..dc0496f 100644
--- a/kernel/src/main.rs
+++ b/kernel/src/main.rs
@@ -29,9 +29,14 @@ use limine::firmware_type::FirmwareType;
 use spin::mutex::Mutex;
 
 use crate::{
-    arch::{asm, x86_64::{
-        cpuid::{CPUID, virt_supported}, gdt::dump_gdt,
-    }}, memory::HHDM_RESPONSE,
+    arch::{
+        asm,
+        x86_64::{
+            cpuid::{CPUID, virt_supported},
+            gdt::dump_gdt,
+        },
+    },
+    memory::HHDM_RESPONSE,
 };
 
 lazy_static! {