From 9b380041e6ad178f96942fd3b2521c1aba21a068 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Mon, 9 Nov 2026 01:57:05 +0800
Subject: [mubios] Add EDD parameters and normalize PS/2 input

---
 mubios/services/int16.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'mubios/services/int16.c')

diff --git a/mubios/services/int16.c b/mubios/services/int16.c
index 4a04828..5872fb1 100644
--- a/mubios/services/int16.c
+++ b/mubios/services/int16.c
@@ -26,6 +26,18 @@
 #define BDA_KBD_BUFFER_START 0x001Eu
 #define BDA_KBD_BUFFER_END 0x003Eu
 
+static u8
+normalize_scancode (u8 scancode)
+{
+  switch (scancode)
+    {
+    case 0x5Au:
+      return 0x1Cu;
+    default:
+      return scancode;
+    }
+}
+
 static u8
 scancode_to_ascii (u8 scancode)
 {
@@ -126,7 +138,7 @@ int16_service (struct bios_regs *regs)
 
   position = *head;
   value = buffer[(position - BDA_KBD_BUFFER_START) >> 1];
-  scancode = (u8)(value >> 8);
+  scancode = normalize_scancode ((u8)(value >> 8));
   ascii = scancode_to_ascii (scancode);
 
   regs->eax = ((u32)scancode << 8) | ascii;
-- 
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