kernel: mm: Introduce a WIP physical_mm

1 files changed, 37 insertions, 0 deletions

diff --git a/kernel/include/mm/physical_mm.h b/kernel/include/mm/physical_mm.h
new file mode 100644
index 0000000..503a76f
--- /dev/null
+++ b/kernel/include/mm/physical_mm.h
@@ -0,0 +1,37 @@
+/*
+ * CMOS
+ * Copyright (C) 2025  Raghuram Subramani <raghus2247@gmail.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __mm_physical_mm_h
+#define __mm_physical_mm_h
+
+#include <common.h>
+
+/*
+ * A byte has 8 bits, hence we can store information for up to 8 blocks at a
+ * time
+ */
+#define BLOCKS_PER_BYTE 8
+
+/* TODO: Update this to 2MiB when PAE is enabled */
+#define BLOCK_SIZE 4 * KiB
+
+#define BLOCK_ALIGN BLOCK_SIZE
+
+void physical_mm_init(void);
+
+#endif