From 571a656a6bd9b4b9d5c595c578d15ba79bb19ef7 Mon Sep 17 00:00:00 2001 From: Samuel Johnson Date: Tue, 1 Jul 2025 10:33:05 -0400 Subject: Add serial logging --- kernel/amd64/io/ports.S | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 kernel/amd64/io/ports.S (limited to 'kernel/amd64/io/ports.S') diff --git a/kernel/amd64/io/ports.S b/kernel/amd64/io/ports.S new file mode 100644 index 0000000..37301a4 --- /dev/null +++ b/kernel/amd64/io/ports.S @@ -0,0 +1,24 @@ +.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 -- cgit v1.2.3