[mubios] Initialize IVT, BDA and EBDA.

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/mubios/core/memory.c b/mubios/core/memory.c
new file mode 100644
index 0000000..ee7ac43
--- /dev/null
+++ b/mubios/core/memory.c
@@ -0,0 +1,48 @@
+/*
+ RCC-Project
+
+ Copyright (C) 2026 Richard Qin
+
+ This file is part of RCC-Project.
+
+ RCC-Project is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your option) any
+ later version.
+
+ RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ RCC-Project; see the file COPYING.  If not see
+ <http://www.gnu.org/licenses/>.
+ */
+
+#include "bios.h"
+
+extern u8 __bss_start[];
+extern u8 __bss_end[];
+
+static void
+zero_bytes (volatile u8 *start, volatile u8 *end)
+{
+  volatile u8 *cursor;
+
+  for (cursor = start; cursor < end; ++cursor)
+    {
+      *cursor = 0;
+    }
+}
+
+void
+memory_init (void)
+{
+  zero_bytes ((volatile u8 *)MUBIOS_IVT_BASE,
+              (volatile u8 *)(MUBIOS_IVT_BASE + MUBIOS_IVT_SIZE));
+
+  zero_bytes ((volatile u8 *)MUBIOS_BDA_BASE,
+              (volatile u8 *)(MUBIOS_BDA_BASE + MUBIOS_BDA_SIZE));
+
+  zero_bytes (__bss_start, __bss_end);
+}