vmm: map multiboot structs

1 files changed, 28 insertions, 0 deletions

diff --git a/src/vmm.h b/src/vmm.h
index 45aa1e8..9de487b 100644
--- a/src/vmm.h
+++ b/src/vmm.h
@@ -1,3 +1,31 @@
+#include <stdlib.h>
+
 #pragma once
 
 extern "C" void dump_address();
+
+struct page_table {
+  uint32_t* addr;
+};
+
+class vmm {
+public:
+  vmm(uint32_t* addr = nullptr);
+
+  constexpr static size_t table_id(uint32_t offset) {
+    offset &= 0xfff00000;
+    offset /= (4 * 1024 * 1024);
+    return static_cast<size_t>(offset);
+  }
+  constexpr static size_t page_id(uint32_t offset) { return static_cast<size_t>(offset / 4096); }
+
+  uint32_t map(uint32_t phys_addr, uint32_t offset);
+
+private:
+  uint32_t* directory;
+};
+
+static_assert(vmm::table_id(0x00001234) == 0);
+static_assert(vmm::table_id(0x00400000) == 1);
+static_assert(vmm::table_id(0xc0000000) == 768);
+static_assert(vmm::table_id(0xc03ff000) == 768);