;[Y] CLEAR INTERRUPTS
;[Y] ENABLE A20 LINE
;[Y] LOAD IN GDT (Global Descriptor Table)
;[-] LOAD IN IDT (Interrupt Descriptor Table)

org 0x7C00
use16

bootloader:
    cli
    xor ax, ax
    mov ds, ax
    mov es, ax
    mov ss, ax
    mov sp, 0x7C00

enable_a20:
    in al, 0x92
    or al, 0x2
    out 0x92, al

load_gdt:
    lgdt [gdt_descriptor]
    mov eax, cr0
    or eax, 1
    mov cr0, eax
    jmp 0x08:start_protected

use32
start_protected:
    mov ax, 0x10
    mov ds, ax
    mov es, ax
    mov fs, ax
    mov gs, ax
    mov ss, ax
    mov esp, 0x90000

;MAIN FOR NOW
    mov edi, 0xB8000
    mov al, '?'
    mov ah, 0x0F
    mov [edi], ax

    jmp $

gdt_start:
gdt_null:
    dd 0x0
    dd 0x0
gdt_code:
    dw 0xFFFF
    dw 0
    db 0
    db 10011010b
    db 11001111b
    db 0
gdt_data:
    dw 0xFFFF
    dw 0
    db 0
    db 10010010b
    db 11001111b
    db 0
gdt_end:
gdt_descriptor:
    dw gdt_end - gdt_start - 1
    dd gdt_start

times 510-($-$$) db 0
dw 0xAA55
    

Would that be LIDT?

My old minimalistic long mode example (originally posted here) has a simple setup with clock and keyboard IRQs handled. It's not that much different in 32-bit case.

And on the opposite end, during my live streams back in 2019 I developed a 16-bit protected mode example that includes setting up the IDT. The videos document how it was put together.