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/int13.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 mubios/services/int16.c | 14 +++++++++++-
 2 files changed, 70 insertions(+), 1 deletion(-)

(limited to 'mubios/services')

diff --git a/mubios/services/int13.c b/mubios/services/int13.c
index 2c12261..73d553b 100644
--- a/mubios/services/int13.c
+++ b/mubios/services/int13.c
@@ -35,6 +35,19 @@ struct edd_packet
   u32 lba_high;
 } __attribute__ ((packed));
 
+struct edd_parameters
+{
+  u16 size;
+  u16 flags;
+  u32 cylinders_low;
+  u32 cylinders_high;
+  u32 heads;
+  u32 sectors_per_track;
+  u32 total_sectors_low;
+  u32 total_sectors_high;
+  u16 bytes_per_sector;
+} __attribute__ ((packed));
+
 static void
 int13_fail (struct bios_regs *regs)
 {
@@ -51,6 +64,15 @@ get_edd_packet (struct bios_regs *regs)
   return (struct edd_packet *)address;
 }
 
+static struct edd_parameters *
+get_edd_parameters (struct bios_regs *regs)
+{
+  u32 address;
+
+  address = ((u32)regs->ds << 4) + (u16)regs->esi;
+  return (struct edd_parameters *)address;
+}
+
 void
 int13_service (struct bios_regs *regs)
 {
@@ -103,5 +125,40 @@ int13_service (struct bios_regs *regs)
       return;
     }
 
+  if (function == 0x48u)
+    {
+      struct edd_parameters *parameters;
+      u16 cylinders;
+      u16 heads;
+      u16 sectors_per_track;
+      u32 total_sectors_low;
+      u32 total_sectors_high;
+
+      parameters = get_edd_parameters (regs);
+
+      if (parameters->size < 0x001Eu
+          || ata_identify (&cylinders, &heads, &sectors_per_track,
+                           &total_sectors_low, &total_sectors_high)
+                 != 0)
+        {
+          int13_fail (regs);
+          return;
+        }
+
+      parameters->size = 0x001Eu;
+      parameters->flags = 0;
+      parameters->cylinders_low = cylinders;
+      parameters->cylinders_high = 0;
+      parameters->heads = heads;
+      parameters->sectors_per_track = sectors_per_track;
+      parameters->total_sectors_low = total_sectors_low;
+      parameters->total_sectors_high = total_sectors_high;
+      parameters->bytes_per_sector = 512;
+
+      regs->eax = 0;
+      regs->flags &= (u16)~BIOS_CF;
+      return;
+    }
+
   int13_fail (regs);
 }
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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