kernel/amd64/io/ports.S


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.section .text
.global inb, outb

inb:
    push    %rbp
    mov     %rsp, %rbp
    sub     $0x10, %rsp
    mov     %rdi, %rdx
    xor     %rax, %rax
    in      (%dx), %al
    add     $0x10, %rsp
    pop     %rbp
    ret

outb:
    push    %rbp
    mov     %rsp, %rbp
    sub     $0x10, %rsp
    mov     %rdi, %rdx
    mov     %rsi, %rax
    out     %al, (%dx)
    add     $0x10, %rsp
    pop     %rbp
    ret