pl: add debug_read

2026-10-30 06:48:22 +00:00 · 2026-06-27 16:29:55 -04:00
parent c10f5a6984
commit 020a6c7d60
2 changed files with 12 additions and 0 deletions
@@ -102,6 +102,13 @@ pub fn debug_write(c: u8) void {
    com1_write(c);
 }

+pub fn debug_read() u8 {
+    while ((amd64.inb(com1 + 0x5) & 0x01) == 0) {
+        std.atomic.spinLoopHint();
+    }
+    return amd64.inb(com1);
+}
+
 pub fn arm_timer(deadline: r.Nanoseconds) void {
    apic.arm_timer(deadline);
 }