Add serial loggingHEADtrunkdev

1 files changed, 24 insertions, 0 deletions

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