[mubios] Initialize VGA mode and serial BIOS services

2 files changed, 75 insertions, 0 deletions

diff --git a/mubios/services/int10.c b/mubios/services/int10.c
index 6793c40..4f6aef1 100644
--- a/mubios/services/int10.c
+++ b/mubios/services/int10.c
@@ -63,6 +63,20 @@ int10_service (struct bios_regs *regs)
   function = (u8)(regs->eax >> 8);
   page = (u8)(regs->ebx >> 8);
 
+  if (function == 0x00u)
+    {
+      if ((u8)regs->eax == 0x03u)
+        vga_text_mode_init ();
+      return;
+    }
+
+  if (function == 0x0Fu)
+    {
+      regs->eax = (regs->eax & 0xFFFF0000u) | 0x5003u;
+      regs->ebx &= 0xFFFF00FFu;
+      return;
+    }
+
   if (function == 0x02u)
     {
       cursor = int10_cursor_for_page (page);
diff --git a/mubios/services/int14.c b/mubios/services/int14.c
new file mode 100644
index 0000000..86019b7
--- /dev/null
+++ b/mubios/services/int14.c
@@ -0,0 +1,61 @@
+/*
+ RCC-Project
+
+ Copyright (C) 2026 Richard Qin
+
+ This file is part of RCC-Project.
+ */
+
+#include "bios.h"
+#include "io.h"
+#include "regs.h"
+
+#define COM1_BASE 0x03F8u
+#define COM_DATA 0x00u
+#define COM_LSR 0x05u
+#define COM_LSR_THRE 0x20u
+#define COM_LSR_IDLE 0x40u
+
+static void
+int14_putc (u8 value)
+{
+  while ((io_in8 ((u16)(COM1_BASE + COM_LSR)) & COM_LSR_THRE) == 0u)
+    {
+    }
+
+  io_out8 ((u16)(COM1_BASE + COM_DATA), value);
+}
+
+void
+int14_service (struct bios_regs *regs)
+{
+  u8 function;
+  u8 status;
+
+  function = (u8)(regs->eax >> 8);
+
+  if (function == 0x00u)
+    {
+      serial_init ();
+      regs->eax &= 0xFFFF0000u;
+      return;
+    }
+
+  if (function == 0x01u)
+    {
+      int14_putc ((u8)regs->eax);
+      status = (u8)(io_in8 ((u16)(COM1_BASE + COM_LSR))
+                    | COM_LSR_THRE | COM_LSR_IDLE);
+      regs->eax = (regs->eax & 0xFFFF00FFu) | ((u32)status << 8);
+      return;
+    }
+
+  if (function == 0x03u)
+    {
+      status = io_in8 ((u16)(COM1_BASE + COM_LSR));
+      regs->eax = (regs->eax & 0xFFFF00FFu) | ((u32)status << 8);
+      return;
+    }
+
+  regs->eax = 0x0100u;
+}