From 7a1e4b743bc45dbd869eeb19eb262654225a090a Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sat, 15 Nov 2025 18:31:54 -0500
Subject: kern/amd64: io: Add uart_puts() helper for strings

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/io/uart.S | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'sys/arch/amd64/io')

diff --git a/sys/arch/amd64/io/uart.S b/sys/arch/amd64/io/uart.S
index 8e190ed..b67527a 100644
--- a/sys/arch/amd64/io/uart.S
+++ b/sys/arch/amd64/io/uart.S
@@ -95,5 +95,36 @@ uart_write:
 .done:
     retq
 
+    .globl uart_puts
+uart_puts:
+    /*
+     * void uart_puts(const char *s);
+     */
+
+    push %r12
+    push %r13
+    push %r14
+    push %r15
+    push %rbx
+    push %rbp
+
+    mov %rsi, %rcx
+    mov %rdi, %rsi
+.putsloop:
+    lodsb
+    or %al, %al
+    jz .putsdone
+    mov $UART_COM1, %dx
+    out %al, %dx
+    jmp .putsloop
+.putsdone:
+
+    pop %rbp
+    pop %rbx
+    pop %r15
+    pop %r14
+    pop %r13
+    pop %r12
+
 /* vim: ft=gas :
 */
-- 
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