PMM: Map the page bitmap to kernel heap once the PMM and VMM are both initialized

kernel/include/memory/PMM.h

@@ -20,4 +20,8 @@ namespace PMM
     uint64_t get_free();
     uint64_t get_used();
     uint64_t get_reserved();
+
+    uint64_t get_bitmap_size();
+
+    void map_bitmap_to_virtual();
 };

kernel/src/init/Init.cpp

@@ -1,3 +1,5 @@
+#define MODULE "init"
+
 #include "init/Init.h"
 #include "assert.h"
 #include "bootboot.h"
@@ -57,6 +59,8 @@ void Init::early_init()
 
     Mersenne::init();
 
+    kdbgln("Page bitmap uses %ld bytes of memory", PMM::get_bitmap_size());
+
     __stack_chk_guard = Mersenne::get();
 }
 

kernel/src/memory/MemoryManager.cpp

@@ -13,6 +13,7 @@ void MemoryManager::init()
 {
     PMM::init();
     kernelVMM.init();
+    PMM::map_bitmap_to_virtual();
 }
 
 void* MemoryManager::get_mapping(void* physicalAddress, int flags)

kernel/src/memory/PMM.cpp

@@ -5,6 +5,7 @@
 #include "bootboot.h"
 #include "memory/Memory.h"
 #include "memory/MemoryManager.h"
+#include "misc/utils.h"
 #include "std/string.h"
 
 extern BOOTBOOT bootboot;
@@ -170,3 +171,14 @@ uint64_t PMM::get_reserved()
 {
     return reserved_mem;
 }
+
+uint64_t PMM::get_bitmap_size()
+{
+    return bitmap_size;
+}
+
+void PMM::map_bitmap_to_virtual()
+{
+    virtual_bitmap_addr =
+        (char*)MemoryManager::get_unaligned_mappings(bitmap_addr, Utilities::get_blocks_from_size(4096, bitmap_size));
+}