section .data

align 16
linux_gdt:
    dq 0

    dq 0

    dw 0xffff
    dw 0x0000
    db 0x00
    db 10011011b
    db 11001111b
    db 0x00

    dw 0xffff
    dw 0x0000
    db 0x00
    db 10010011b
    db 11001111b
    db 0x00

  .end:

align 16
linux_gdt_ptr:
    dw (linux_gdt.end - linux_gdt) - 1
    dd 0

bits 32

section .text

global linux_spinup
linux_spinup:
    call .p0
  .p0:
    pop eax
    lea ebx, [eax - (linux_spinup.p0 - linux_gdt_ptr)]
    lea ecx, [eax - (linux_spinup.p0 - linux_gdt)]
    mov [ebx+2], ecx

    lgdt [ebx]

    push 0x10
    call .p1
  .p1:
    add dword [esp], .fj - .p1
    retfd

  .fj:
    mov eax, 0x18
    mov ds, eax
    mov es, eax
    mov fs, eax
    mov gs, eax
    mov ss, eax

    xor ebp, ebp
    xor edi, edi
    xor ebx, ebx

    mov esi, [esp+8] ; boot_params

    cld

    jmp [esp+4]