feat: Initial PMM implementation

Introduce the foundational Physical Memory Manager (PMM) and restructure the project for modularity.
Implemented basic PMM and related memory management headers (mm/pmm.h, mm/vm.h).
Updated Makefile and build process to support new modular structure.

1 files changed, 21 insertions, 0 deletions

diff --git a/include/kernel/mm.h b/include/kernel/mm.h
new file mode 100644
index 0000000..0f7c73d
--- /dev/null
+++ b/include/kernel/mm.h
@@ -0,0 +1,21 @@
+#pragma once
+#include "common/types.h"
+
+namespace VM
+{
+    typedef uint64_t* pagetable_t;
+    typedef uint64_t pte_t;
+    typedef uint64_t uint64;
+
+    #define PTE_V (1L << 0)
+    #define PTE_R (1L << 1)
+    #define PTE_W (1L << 2)
+    #define PTE_X (1L << 3)
+    #define PTE_U (1L << 4)
+
+    #define SATP_SV39 (8L << 60)
+    #define MAKE_SATP(pagetable) (SATP_SV39 | (((uint64)pagetable) >> 12))
+
+    void kvminit();
+    void kvminithart();
+}
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