diff --git a/.gitignore b/.gitignore
index 53b3cb2..a683549 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,4 @@ Module.symvers
 Mkfile.old
 dkms.conf
 .vscode/*
+TODO.md
\ No newline at end of file
diff --git a/kernel/cpu/interrupts.asm b/kernel/cpu/interrupts.asm
index 23970a1..2c77459 100644
--- a/kernel/cpu/interrupts.asm
+++ b/kernel/cpu/interrupts.asm
@@ -15,7 +15,7 @@ extern irq_handler ; Defined in drivers/isr.h
     isr%1:
         cli             ; Disable interrupts
         push byte 0     ; Push dummy error code
-        push byte 1     ; Push interrupt number
+        push byte %1    ; Push interrupt number
         jmp isr_common  ; goto ISR handler
 %endmacro
 
diff --git a/kernel/drivers/gdt.c b/kernel/drivers/gdt.c
index 0fb13dc..c675d4b 100644
--- a/kernel/drivers/gdt.c
+++ b/kernel/drivers/gdt.c
@@ -65,7 +65,7 @@ static void init_gdt() {
 static gdt_entry_t construct_entry(gdt_access_t access) {
     gdt_entry_t entry = (struct gdt_entry_struct) {
         .base_low = GDT_BASE & 0xFFFF,
-        .base_middle = (GDT_BASE >> 16) % 0xFF,
+        .base_middle = (GDT_BASE >> 16) & 0xFF,
         .base_high = (GDT_BASE >> 24) & 0xFF,
         .limit_low = (GDT_LIMIT & 0xFFFF),
         .access = access,
diff --git a/kernel/drivers/gdt.h b/kernel/drivers/gdt.h
index d0092b3..0e31ade 100644
--- a/kernel/drivers/gdt.h
+++ b/kernel/drivers/gdt.h
@@ -49,8 +49,8 @@
 #define GDT_DATA_TYPE_READ_WRITE_ACCESSED                   0x3
 #define GDT_DATA_TYPE_READ_ONLY_EXPAND_DOWN                 0x4
 #define GDT_DATA_TYPE_READ_ONLY_EXPAND_DOWN_ACCESSED        0x5
-#define GDT_DATA_TYPE_READ_WRITE_EXPAND_DATA                0x6
-#define GDT_DATA_TYPE_READ_WRITE_EXPAND_DATA_ACCESSED       0x7
+#define GDT_DATA_TYPE_READ_WRITE_EXPAND_DOWN                0x6
+#define GDT_DATA_TYPE_READ_WRITE_EXPAND_DOWN_ACCESSED       0x7
 #define GDT_DATA_TYPE_EXEC_ONLY                             0x8
 #define GDT_CODE_TYPE_EXEC_ONLY_ACCESSED                    0x9
 #define GDT_CODE_TYPE_EXEC_READ                             0xA
diff --git a/kernel/drivers/isr.c b/kernel/drivers/isr.c
index ea44170..7e30c4e 100644
--- a/kernel/drivers/isr.c
+++ b/kernel/drivers/isr.c
@@ -1,7 +1,7 @@
 #include <stdint.h>
 #include "isr.h"
-#include "../libc/string.h"
 #include "tty.h"
+#include "../libc/string.h"
 #include "ports.h"
 
 #define PIC1            0x20 // I/O address for master PIC
@@ -70,7 +70,7 @@ void ack_irq(uint32_t int_num) {
     // Send and End Of Interrupt(EOF) at the PICs.
     if(int_num >= 40)
         outb(PIC2_COMMAND, PIC_EOI); // Send reset signal to slave
-    outb(PIC2_COMMAND, PIC_EOI); // In any case, reset the master
+    outb(PIC1_COMMAND, PIC_EOI); // In any case, reset the master
 }
 
 void irq_handler(registers_t regs) {
diff --git a/kernel/kernel_main.c b/kernel/kernel_main.c
index cd1e50c..819ad12 100644
--- a/kernel/kernel_main.c
+++ b/kernel/kernel_main.c
@@ -1,7 +1,6 @@
 #include "drivers/tty.h"
 #include "drivers/gdt.h"
 #include "drivers/idt.h"
-#include "drivers/isr.h"
 #include "libc/stdio.h"
 
 void kernel_main() {